From b0faf699cb7dd2d30f33dbcc8888d40e6269844c Mon Sep 17 00:00:00 2001
From: fhchl <fhchl@users.noreply.github.com>
Date: Sun, 31 Oct 2021 21:35:42 +0100
Subject: [PATCH 1/4] add resample library

Update design_fir.py

fix filename
---
 libraries/Resample/Resample.cpp  |  135 ++
 libraries/Resample/Resampler.h   |   41 +
 libraries/Resample/aa_fir.h      | 2935 ++++++++++++++++++++++++++++++
 libraries/Resample/build.sh      |    2 +
 libraries/Resample/design_fir.py |   73 +
 libraries/Resample/lib.metadata  |   17 +
 libraries/Resample/render.cpp    |   86 +
 7 files changed, 3289 insertions(+)
 create mode 100644 libraries/Resample/Resample.cpp
 create mode 100644 libraries/Resample/Resampler.h
 create mode 100644 libraries/Resample/aa_fir.h
 create mode 100755 libraries/Resample/build.sh
 create mode 100644 libraries/Resample/design_fir.py
 create mode 100644 libraries/Resample/lib.metadata
 create mode 100644 libraries/Resample/render.cpp

diff --git a/libraries/Resample/Resample.cpp b/libraries/Resample/Resample.cpp
new file mode 100644
index 000000000..e4ddd3c14
--- /dev/null
+++ b/libraries/Resample/Resample.cpp
@@ -0,0 +1,135 @@
+#include <iostream>
+#include <math.h> // ceil
+#include <string.h>
+
+#include "Resample.h"
+#include "aa_fir.h"
+
+std::vector<float> get_fir(unsigned int factor, enum fir_quality quality, enum fir_phase phase) {
+    if (factor == 2 && quality == FIR_HIGH && phase == MINIMUM)
+        return fir_2_high_minphase;
+    else if (factor == 2 && quality == FIR_HIGH && phase == LINEAR)
+        return fir_2_high_linear;
+    else if (factor == 2 && quality == FIR_LOW && phase == MINIMUM)
+        return fir_2_low_minphase;
+    else if (factor == 2 && quality == FIR_LOW && phase == LINEAR)
+        return fir_2_low_linear;
+    else if (factor == 4 && quality == FIR_HIGH && phase == MINIMUM)
+        return fir_4_high_minphase;
+    else if (factor == 4 && quality == FIR_HIGH && phase == LINEAR)
+        return fir_4_high_linear;
+    else if (factor == 4 && quality == FIR_LOW && phase == MINIMUM)
+        return fir_4_low_minphase;
+    else if (factor == 4 && quality == FIR_LOW && phase == LINEAR)
+        return fir_4_low_linear;
+    else if (factor == 8 && quality == FIR_HIGH && phase == MINIMUM)
+        return fir_8_high_minphase;
+    else if (factor == 8 && quality == FIR_HIGH && phase == LINEAR)
+        return fir_8_high_linear;
+    else if (factor == 8 && quality == FIR_LOW && phase == MINIMUM)
+        return fir_8_low_minphase;
+    else if (factor == 8 && quality == FIR_LOW && phase == LINEAR)
+        return fir_8_low_linear;
+    else if (factor == 16 && quality == FIR_HIGH && phase == MINIMUM)
+        return fir_16_high_minphase;
+    else if (factor == 16 && quality == FIR_HIGH && phase == LINEAR)
+        return fir_16_high_linear;
+    else if (factor == 16 && quality == FIR_LOW && phase == MINIMUM)
+        return fir_16_low_minphase;
+    else if (factor == 16 && quality == FIR_LOW && phase == LINEAR)
+        return fir_16_low_linear;
+    else {
+        std::cerr << "get_fir: invalid combination" << std::endl;
+        return std::vector<float>();
+    }
+}
+
+int DecimatorChannel::setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality, enum fir_phase phase) {
+    cleanup();
+    this->blockSize            = blockSize;
+    this->decimationFactor     = decimationFactor;
+    std::vector<float> fir     = get_fir(decimationFactor, quality, phase);
+    uint               numTaps = fir.size();
+
+    pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
+    pState = (ne10_float32_t*)NE10_MALLOC(
+        (numTaps + blockSize - 1) * sizeof(ne10_float32_t));
+    if (!pState || !pCoeff)
+        return -1;
+
+    for (unsigned int n = 0; n < numTaps; ++n) {
+        // reverse filter coefficients
+        pCoeff[n] = fir[numTaps - 1 - n];
+    }
+    int err = ne10_fir_decimate_init_float(&decimator, numTaps, decimationFactor, pCoeff, pState, blockSize);
+    if (err) {
+        std::cerr << "ERR: blockSize must be whole multiple of decimationFactor" << std::endl;
+        return -1;
+    }
+
+    return 0;
+}
+
+void DecimatorChannel::process(ne10_float32_t* outBlock, ne10_float32_t* inBlock) {
+    ne10_fir_decimate_float_neon(&decimator, inBlock, outBlock, blockSize);
+}
+
+void DecimatorChannel::cleanup() {
+    NE10_FREE(pCoeff);
+    NE10_FREE(pState);
+    pCoeff = nullptr;
+    pState = nullptr;
+}
+
+int InterpolatorChannel::setup(unsigned int interpolationFactor, unsigned int blockSize, enum fir_quality quality, enum fir_phase phase) {
+    cleanup();
+    this->blockSize             = blockSize;
+    this->interpolationFactor   = interpolationFactor;
+    std::vector<float> fir      = get_fir(interpolationFactor, quality, phase);
+    uint               filtSize = fir.size();
+    // numTaps must be a multiple of the interpolation factor
+    uint numTaps = ceil((float)filtSize / interpolationFactor) * interpolationFactor;
+
+    pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
+    pState = (ne10_float32_t*)NE10_MALLOC(
+        (blockSize + numTaps / interpolationFactor - 1) * sizeof(ne10_float32_t));
+    if (!pState || !pCoeff)
+        return -1;
+
+    for (unsigned int n = 0; n < filtSize; ++n) {
+        // reverse fir coefficients
+        pCoeff[numTaps - filtSize + n] = fir[filtSize - 1 - n];
+    }
+    for (uint n = 0; n < numTaps - filtSize; ++n) {
+        pCoeff[n] = 0;
+    }
+
+    int err = ne10_fir_interpolate_init_float(&Interpolator, interpolationFactor, numTaps, pCoeff, pState, blockSize);
+    if (err) {
+        std::cerr << "Error: couldn't init interpolator" << std::endl;
+        return -1;
+    }
+
+    return 0;
+}
+
+void InterpolatorChannel::process(ne10_float32_t* outBlock, ne10_float32_t* inBlock) {
+    ne10_fir_interpolate_float_neon(&Interpolator, inBlock, outBlock, blockSize);
+}
+
+void InterpolatorChannel::cleanup() {
+    NE10_FREE(pCoeff);
+    NE10_FREE(pState);
+    pCoeff = nullptr;
+    pState = nullptr;
+}
+
+#if 0
+#undef NDEBUG
+#include <assert.h>
+bool DecimatorTest()
+{
+    // TODO
+    return false;
+}
+#endif
diff --git a/libraries/Resample/Resampler.h b/libraries/Resample/Resampler.h
new file mode 100644
index 000000000..3a4d54996
--- /dev/null
+++ b/libraries/Resample/Resampler.h
@@ -0,0 +1,41 @@
+#define ENABLE_NE10_FIR_DECIMATE_FLOAT_NEON // Defines needed for Ne10 library
+#define ENABLE_NE10_FIR_INTERPOLATE_FLOAT_NEON
+
+#include <libraries/ne10/NE10.h>   // neon library
+#include <vector>
+
+enum fir_quality {FIR_HIGH, FIR_LOW};
+enum fir_phase   {MINIMUM, LINEAR};
+
+class DecimatorChannel {
+public:
+	DecimatorChannel() {};
+	~DecimatorChannel() { cleanup(); };
+    int  setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality=FIR_HIGH, enum fir_phase phase=LINEAR);
+    void process(ne10_float32_t* outBlock, ne10_float32_t* inBlock);
+    void cleanup();
+
+private:
+    unsigned int                        blockSize;
+    unsigned int                        decimationFactor;
+    ne10_fir_decimate_instance_f32_t    decimator;
+    ne10_float32_t*                     pCoeff = nullptr;
+    ne10_float32_t*                     pState = nullptr;
+};
+
+
+class InterpolatorChannel {
+public:
+    InterpolatorChannel() {};
+    ~InterpolatorChannel() { cleanup(); };
+    int  setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality=FIR_HIGH, enum fir_phase phase=LINEAR);
+    void process(ne10_float32_t* outBlock, ne10_float32_t* inBlock);
+    void cleanup();
+
+private:
+    unsigned int                        blockSize;
+    unsigned int                        interpolationFactor;
+    ne10_fir_interpolate_instance_f32_t Interpolator;
+    ne10_float32_t*                     pCoeff = nullptr;
+    ne10_float32_t*                     pState = nullptr;
+};
diff --git a/libraries/Resample/aa_fir.h b/libraries/Resample/aa_fir.h
new file mode 100644
index 000000000..2f2e09bc2
--- /dev/null
+++ b/libraries/Resample/aa_fir.h
@@ -0,0 +1,2935 @@
+#include <vector>
+
+// cutoff:  0.225 * sr
+// numTaps: 51
+// ripple:  80
+// phase: minimum
+std::vector<float> fir_2_high_minphase = {
+	4.3706528813533388e-02,
+	1.7608030145017156e-01,
+	3.4636014443969498e-01,
+	3.9745703122665310e-01,
+	2.2599727312827095e-01,
+	-5.0700545244314728e-02,
+	-1.8244488035888839e-01,
+	-7.4669159516500702e-02,
+	9.3187301784674742e-02,
+	1.0253747728603990e-01,
+	-2.5722358011200638e-02,
+	-9.2249911120522360e-02,
+	-1.6275882808193906e-02,
+	6.8974082741580234e-02,
+	3.8423014764962016e-02,
+	-4.3753881030381296e-02,
+	-4.6675263419433274e-02,
+	2.1466355947297535e-02,
+	4.5883893687524893e-02,
+	-4.0316894009317095e-03,
+	-3.9780253249977394e-02,
+	-8.1354562312130618e-03,
+	3.1126735721632076e-02,
+	1.5441642382372417e-02,
+	-2.1894738994747878e-02,
+	-1.8708685875882959e-02,
+	1.3382931491731913e-02,
+	1.8941176582948905e-02,
+	-6.3467268381686599e-03,
+	-1.7147287605624072e-02,
+	1.0992815009898728e-03,
+	1.4236082809213312e-02,
+	2.3663969736250519e-03,
+	-1.0937691424462829e-02,
+	-4.2801464976365312e-03,
+	7.7857937253056411e-03,
+	4.9782487181761325e-03,
+	-5.0976764869728759e-03,
+	-4.8449818003182803e-03,
+	3.0273141040501410e-03,
+	4.2214390817810034e-03,
+	-1.5757761393171113e-03,
+	-3.3987591154223951e-03,
+	6.7113962149788664e-04,
+	2.5682940788608792e-03,
+	-1.8055681947046358e-04,
+	-1.8547699751203942e-03,
+	-2.2264889502389472e-05,
+	1.2994380571425194e-03,
+	6.2186460119932597e-05,
+	-9.0928107788862877e-04
+};
+
+// cutoff:  0.225 * sr
+// numTaps: 102
+// ripple:  80
+// phase:   linear
+std::vector<float> fir_2_high_linear = {
+	1.2809588808484079e-05,
+	2.2257572396190979e-05,
+	-2.3909482985913336e-05,
+	-6.1981617882020452e-05,
+	2.1970937541873286e-05,
+	1.2739671389496254e-04,
+	1.3271521943359048e-05,
+	-2.1327446396811811e-04,
+	-1.0698695253503211e-04,
+	2.9944015664806447e-04,
+	2.8292217699696479e-04,
+	-3.4709267831123890e-04,
+	-5.5359210642144934e-04,
+	2.9921222955062567e-04,
+	9.0835190356575841e-04,
+	-8.6943026005468176e-05,
+	-1.3019066604756640e-03,
+	-3.5713734432907382e-04,
+	1.6466699039334061e-03,
+	1.0794905552958267e-03,
+	-1.8125694339519993e-03,
+	-2.0822840462476327e-03,
+	1.6371950950831416e-03,
+	3.3003790763007405e-03,
+	-9.4756535312468817e-04,
+	-4.5838052979045828e-03,
+	-4.0751506592246785e-04,
+	5.6908510487912118e-03,
+	2.5180561004644686e-03,
+	-6.2955262668019504e-03,
+	-5.3720827854385738e-03,
+	6.0104239738092060e-03,
+	8.8200084515865675e-03,
+	-4.4221124139289447e-03,
+	-1.2549786578044873e-02,
+	1.1313555622793894e-03,
+	1.6074724561412183e-02,
+	4.2156088798689546e-03,
+	-1.8727731920182157e-02,
+	-1.1928162907840725e-02,
+	1.9638266498467821e-02,
+	2.2351180888065980e-02,
+	-1.7622290074269353e-02,
+	-3.6146568257888839e-02,
+	1.0755051545235596e-02,
+	5.5231322813222954e-02,
+	5.3901070844156558e-03,
+	-8.6884820903499388e-02,
+	-4.8287604644234046e-02,
+	1.8034826714279473e-01,
+	4.1329665829982010e-01,
+	4.1329665829982010e-01,
+	1.8034826714279473e-01,
+	-4.8287604644234046e-02,
+	-8.6884820903499388e-02,
+	5.3901070844156558e-03,
+	5.5231322813222954e-02,
+	1.0755051545235596e-02,
+	-3.6146568257888839e-02,
+	-1.7622290074269353e-02,
+	2.2351180888065980e-02,
+	1.9638266498467821e-02,
+	-1.1928162907840725e-02,
+	-1.8727731920182157e-02,
+	4.2156088798689546e-03,
+	1.6074724561412183e-02,
+	1.1313555622793894e-03,
+	-1.2549786578044873e-02,
+	-4.4221124139289447e-03,
+	8.8200084515865675e-03,
+	6.0104239738092060e-03,
+	-5.3720827854385738e-03,
+	-6.2955262668019504e-03,
+	2.5180561004644686e-03,
+	5.6908510487912118e-03,
+	-4.0751506592246785e-04,
+	-4.5838052979045828e-03,
+	-9.4756535312468817e-04,
+	3.3003790763007405e-03,
+	1.6371950950831416e-03,
+	-2.0822840462476327e-03,
+	-1.8125694339519993e-03,
+	1.0794905552958267e-03,
+	1.6466699039334061e-03,
+	-3.5713734432907382e-04,
+	-1.3019066604756640e-03,
+	-8.6943026005468176e-05,
+	9.0835190356575841e-04,
+	2.9921222955062567e-04,
+	-5.5359210642144934e-04,
+	-3.4709267831123890e-04,
+	2.8292217699696479e-04,
+	2.9944015664806447e-04,
+	-1.0698695253503211e-04,
+	-2.1327446396811811e-04,
+	1.3271521943359048e-05,
+	1.2739671389496254e-04,
+	2.1970937541873286e-05,
+	-6.1981617882020452e-05,
+	-2.3909482985913336e-05,
+	2.2257572396190979e-05,
+	1.2809588808484079e-05
+};
+
+// cutoff:  0.175 * sr
+// numTaps: 13
+// ripple:  60
+// phase: minimum
+std::vector<float> fir_2_low_minphase = {
+	8.3910339841564929e-02,
+	2.4235249093920486e-01,
+	3.6667517585546983e-01,
+	3.2956519002993112e-01,
+	1.3629383766468631e-01,
+	-6.0147618215516924e-02,
+	-1.1712243768235857e-01,
+	-4.4270292752062311e-02,
+	3.6084768181273860e-02,
+	4.2659686554269063e-02,
+	3.2465303553767537e-03,
+	-1.7798064076355914e-02,
+	-7.1398746621870205e-03
+};
+
+// cutoff:  0.175 * sr
+// numTaps: 26
+// ripple:  60
+// phase:   linear
+std::vector<float> fir_2_low_linear = {
+	4.7991244665945647e-04,
+	1.1780432466133804e-04,
+	-2.7183058989479095e-03,
+	-4.9820510898411956e-03,
+	7.6806349668853636e-04,
+	1.4263565931065035e-02,
+	1.7763579590002344e-02,
+	-8.0396926438541013e-03,
+	-4.8869782894521221e-02,
+	-4.8164275209873209e-02,
+	4.3960274433956462e-02,
+	2.0397260444006068e-01,
+	3.3144830307394374e-01,
+	3.3144830307394374e-01,
+	2.0397260444006068e-01,
+	4.3960274433956462e-02,
+	-4.8164275209873209e-02,
+	-4.8869782894521221e-02,
+	-8.0396926438541013e-03,
+	1.7763579590002344e-02,
+	1.4263565931065035e-02,
+	7.6806349668853636e-04,
+	-4.9820510898411956e-03,
+	-2.7183058989479095e-03,
+	1.1780432466133804e-04,
+	4.7991244665945647e-04
+};
+
+// cutoff:  0.1125 * sr
+// numTaps: 101
+// ripple:  80
+// phase: minimum
+std::vector<float> fir_4_high_minphase = {
+	9.4163733984470362e-03,
+	2.7636846126993575e-02,
+	5.7974435332447935e-02,
+	9.8567102274506047e-02,
+	1.4302670017673091e-01,
+	1.8108153025307200e-01,
+	2.0115267987015284e-01,
+	1.9420926119088161e-01,
+	1.5750421401668371e-01,
+	9.6705585069163436e-02,
+	2.5209144512277439e-02,
+	-3.9451451798271142e-02,
+	-8.1135065974570764e-02,
+	-9.0556118936076457e-02,
+	-6.8624926138222381e-02,
+	-2.6193517784686593e-02,
+	1.9818458021025331e-02,
+	5.2598023261743412e-02,
+	6.1481752768719714e-02,
+	4.5589718244665567e-02,
+	1.3559174384251445e-02,
+	-2.0397724180449071e-02,
+	-4.2484998304842002e-02,
+	-4.4819315423073713e-02,
+	-2.8250759380676577e-02,
+	-1.3905134474706301e-03,
+	2.3513561208342568e-02,
+	3.6023071273977705e-02,
+	3.1819826093003253e-02,
+	1.4137932902904115e-02,
+	-8.1847678642155246e-03,
+	-2.4953534633059934e-02,
+	-2.9216674317024516e-02,
+	-2.0093278732426598e-02,
+	-2.7431507184828498e-03,
+	1.4388689117731994e-02,
+	2.3593426717513542e-02,
+	2.1340755011867586e-02,
+	9.5650423162116291e-03,
+	-5.6026010809751689e-03,
+	-1.6956171204259879e-02,
+	-1.9586864970590347e-02,
+	-1.2987786638033108e-02,
+	-9.3992198275135992e-04,
+	1.0542273908997476e-02,
+	1.6180834889560652e-02,
+	1.3829913820165317e-02,
+	5.2433444455688089e-03,
+	-5.0632239113460060e-03,
+	-1.2124469512109326e-02,
+	-1.2908097938157403e-02,
+	-7.5729741773394935e-03,
+	8.4907380024517286e-04,
+	8.1306931946397848e-03,
+	1.0936805617954959e-02,
+	8.3372713839572239e-03,
+	2.0358466976246057e-03,
+	-4.6461088593201883e-03,
+	-8.5103960914116109e-03,
+	-7.9788666183378647e-03,
+	-3.7148117666288096e-03,
+	1.9034843800152855e-03,
+	6.0675387959306451e-03,
+	6.9339880728904874e-03,
+	4.4070150054367208e-03,
+	3.6493025399741044e-05,
+	-3.9032365889502588e-03,
+	-5.5632554971153329e-03,
+	-4.3845478000597380e-03,
+	-1.2300635850214154e-03,
+	2.1693944142746110e-03,
+	4.1509580720377175e-03,
+	3.9088147328482890e-03,
+	1.8134825825300894e-03,
+	-9.1585317540170282e-04,
+	-2.8794828135868104e-03,
+	-3.2136215526483753e-03,
+	-1.9470376252294431e-03,
+	1.0701919405531060e-04,
+	1.8519797994040448e-03,
+	2.4682674118547414e-03,
+	1.7997955963484926e-03,
+	3.3428971143261755e-04,
+	-1.0969400906597369e-03,
+	-1.7923892150460696e-03,
+	-1.5037564654914680e-03,
+	-5.1076751890702680e-04,
+	5.9512164160439754e-04,
+	1.2403716698198065e-03,
+	1.1702754405410539e-03,
+	5.1743295988688760e-04,
+	-2.9636459848144113e-04,
+	-8.3529523195099249e-04,
+	-8.5969974802408431e-04,
+	-4.3853186669767194e-04,
+	1.4630242010957767e-04,
+	5.5933749857843941e-04,
+	6.1160879961329564e-04,
+	3.2622672162725024e-04,
+	-8.6989126156705488e-05,
+	-3.8796000673391770e-04
+};
+
+// cutoff:  0.1125 * sr
+// numTaps: 202
+// ripple:  80
+// phase:   linear
+std::vector<float> fir_4_high_linear = {
+	7.9416495800456849e-06,
+	1.0666766545226993e-05,
+	7.2043011730087487e-06,
+	-3.6353664766193800e-06,
+	-1.8131391471034205e-05,
+	-2.8134351689016341e-05,
+	-2.4887624384282806e-05,
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+	2.6442414095542878e-05,
+	5.3592770552911054e-05,
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+	9.0702020296232568e-04,
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+	-1.3714581391458451e-02,
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+	6.1046275078176166e-03,
+	-2.2912721880321376e-03,
+	-8.6808018962932880e-03,
+	-1.0406382683836847e-02,
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+	-2.2045293234960670e-03,
+	1.3192340633685223e-04,
+	2.1514073199152797e-03,
+	2.9671708290431886e-03,
+	2.3407401451983581e-03,
+	7.1956430442878840e-04,
+	-1.0444164629097195e-03,
+	-2.1305812828337233e-03,
+	-2.1220420255502652e-03,
+	-1.1503367269864420e-03,
+	2.2837156006606761e-04,
+	1.3377789216588666e-03,
+	1.7054138794833065e-03,
+	1.2545743334046529e-03,
+	2.9145850209503794e-04,
+	-6.8200695126052367e-04,
+	-1.2222266750105992e-03,
+	-1.1395832354814586e-03,
+	-5.5278091561035924e-04,
+	2.0533118218913404e-04,
+	7.6805955548933874e-04,
+	9.0702020296232568e-04,
+	6.1785976422930355e-04,
+	9.1549571827174886e-05,
+	-4.0003500421072641e-04,
+	-6.3972621854085552e-04,
+	-5.5637930898261496e-04,
+	-2.3604796053600674e-04,
+	1.4061264603465695e-04,
+	3.9505914423178690e-04,
+	4.3199666080693709e-04,
+	2.6984238239051049e-04,
+	1.4233853594376727e-05,
+	-2.0428288023313998e-04,
+	-2.9389784313998312e-04,
+	-2.3687835176609763e-04,
+	-8.4929420906533138e-05,
+	7.6559756139410196e-05,
+	1.7349259963575045e-04,
+	1.7480320197427060e-04,
+	9.8586815867606961e-05,
+	-5.5670617836611223e-06,
+	-8.5398600772487637e-05,
+	-1.1040887967718020e-04,
+	-8.1343812457310898e-05,
+	-2.3257904565985952e-05,
+	3.1256326086672198e-05,
+	5.8740290262321940e-05,
+	5.3592770552911054e-05,
+	2.6442414095542878e-05,
+	-4.7428612547107354e-06,
+	-2.4887624384282806e-05,
+	-2.8134351689016341e-05,
+	-1.8131391471034205e-05,
+	-3.6353664766193800e-06,
+	7.2043011730087487e-06,
+	1.0666766545226993e-05,
+	7.9416495800456849e-06
+};
+
+// cutoff:  0.0875 * sr
+// numTaps: 25
+// ripple:  60
+// phase: minimum
+std::vector<float> fir_4_low_minphase = {
+	3.1549784969979441e-02,
+	6.3835494099582418e-02,
+	1.0485593181961289e-01,
+	1.4572887960165432e-01,
+	1.7650785084814868e-01,
+	1.8837741437622602e-01,
+	1.7625599752469689e-01,
+	1.4111948761261550e-01,
+	8.9838077306901382e-02,
+	3.3682756524880432e-02,
+	-1.5308683054212098e-02,
+	-4.7532060322641748e-02,
+	-5.8790127166007511e-02,
+	-5.0813367641447324e-02,
+	-3.0406330600080564e-02,
+	-6.4464898344456043e-03,
+	1.2873552216093763e-02,
+	2.2740210129544407e-02,
+	2.2406037082009722e-02,
+	1.4837626722673285e-02,
+	4.6088510839634098e-03,
+	-3.8270424537331519e-03,
+	-7.9933492977103393e-03,
+	-7.5874077354428793e-03,
+	-4.3113809196592360e-03
+};
+
+// cutoff:  0.0875 * sr
+// numTaps: 50
+// ripple:  60
+// phase:   linear
+std::vector<float> fir_4_low_linear = {
+	2.0816110347548678e-04,
+	1.6724218604766616e-04,
+	-1.5211715489392351e-04,
+	-7.9428042634456194e-04,
+	-1.6086883863679446e-03,
+	-2.2160471678977149e-03,
+	-2.0934825806087601e-03,
+	-7.8805644566280156e-04,
+	1.7980034884823510e-03,
+	5.1676154826178948e-03,
+	8.1744721446680244e-03,
+	9.2554265518639406e-03,
+	6.9526525885758124e-03,
+	5.9949954979067704e-04,
+	-9.0652188423634081e-03,
+	-1.9626128484325867e-02,
+	-2.7266738670884003e-02,
+	-2.7628930096201064e-02,
+	-1.7080052817462894e-02,
+	5.9734912720489476e-03,
+	4.0165916292933167e-02,
+	8.1012528592306343e-02,
+	1.2166472458036415e-01,
+	1.5444233622790327e-01,
+	1.7273767101193518e-01,
+	1.7273767101193518e-01,
+	1.5444233622790327e-01,
+	1.2166472458036415e-01,
+	8.1012528592306343e-02,
+	4.0165916292933167e-02,
+	5.9734912720489476e-03,
+	-1.7080052817462894e-02,
+	-2.7628930096201064e-02,
+	-2.7266738670884003e-02,
+	-1.9626128484325867e-02,
+	-9.0652188423634081e-03,
+	5.9949954979067704e-04,
+	6.9526525885758124e-03,
+	9.2554265518639406e-03,
+	8.1744721446680244e-03,
+	5.1676154826178948e-03,
+	1.7980034884823510e-03,
+	-7.8805644566280156e-04,
+	-2.0934825806087601e-03,
+	-2.2160471678977149e-03,
+	-1.6086883863679446e-03,
+	-7.9428042634456194e-04,
+	-1.5211715489392351e-04,
+	1.6724218604766616e-04,
+	2.0816110347548678e-04
+};
+
+// cutoff:  0.05625 * sr
+// numTaps: 202
+// ripple:  80
+// phase: minimum
+std::vector<float> fir_8_high_minphase = {
+	3.6679905625581427e-03,
+	6.6852039280002676e-03,
+	1.1345443803682964e-02,
+	1.7543368245483963e-02,
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+	1.0047083235484513e-03,
+	6.9920381204194803e-04,
+	3.2290301716889541e-04,
+	-7.0234104094984198e-05,
+	-4.2631603642849590e-04,
+	-7.0071073201437913e-04,
+	-8.6292137156578812e-04,
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+	1.9828066938670460e-04,
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+	5.8175065596089077e-04,
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+	-2.5171294069357335e-04,
+	-3.8145067372861161e-04,
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+	-4.4675618322290265e-04,
+	-3.8269648643235980e-04,
+	-2.7025433377086299e-04,
+	-1.2957324523947018e-04,
+	1.7726186751209860e-05,
+	1.5029986316962500e-04,
+	2.5083748417526825e-04,
+	3.0701615991104254e-04,
+	3.1417301479274976e-04,
+	2.7524199263590139e-04,
+	1.9929473895788832e-04,
+	1.0072109400639116e-04,
+	-4.3461843853787055e-06,
+	-1.0009251583025407e-04,
+	-1.7293364953008730e-04,
+	-2.1415175462563844e-04
+};
+
+// cutoff:  0.05625 * sr
+// numTaps: 403
+// ripple:  80
+// phase:   linear
+std::vector<float> fir_8_high_linear = {
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+	-1.1628991651399364e-05,
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+	-2.3714386555459034e-06,
+	-8.4051647165787538e-06,
+	-1.2443854319157100e-05,
+	-1.4291114685124852e-05,
+	-1.4067223467224462e-05,
+	-1.2145962120363102e-05,
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+	-5.4307575226784832e-06,
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+	5.3334013281351790e-06,
+	4.9306016374296919e-06,
+	3.9708382327681750e-06
+};
+
+// cutoff:  0.04375 * sr
+// numTaps: 49
+// ripple:  60
+// phase: minimum
+std::vector<float> fir_8_low_minphase = {
+	1.4936650840847943e-02,
+	2.0359709185325533e-02,
+	2.8827251234259041e-02,
+	3.8578620044113804e-02,
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+	4.9293354136118545e-02,
+	3.5270814997201708e-02,
+	2.1151511805781672e-02,
+	7.7527985609942640e-03,
+	-4.2463214072826320e-03,
+	-1.4241741551310942e-02,
+	-2.1834229243643664e-02,
+	-2.6756664413450149e-02,
+	-2.9017895684741151e-02,
+	-2.8749233468463323e-02,
+	-2.6302772640005877e-02,
+	-2.2117314947797999e-02,
+	-1.6773305425894364e-02,
+	-1.0822454258964906e-02,
+	-4.8614132245560085e-03,
+	6.3459456608048104e-04,
+	5.2311968596874293e-03,
+	8.6748239822667765e-03,
+	1.0801836499689958e-02,
+	1.1637350120844794e-02,
+	1.1261751074097871e-02,
+	9.9197787289317975e-03,
+	7.8657121469492032e-03,
+	5.4261431054320498e-03,
+	2.8767996511495936e-03,
+	5.2451998519949152e-04,
+	-1.4522688375217976e-03,
+	-2.8899214602344878e-03,
+	-3.7454640728270872e-03,
+	-4.0021799310748871e-03,
+	-3.7666596710286102e-03,
+	-3.1268434964776392e-03,
+	-2.2543950518303752e-03
+};
+
+// cutoff:  0.04375 * sr
+// numTaps: 98
+// ripple:  60
+// phase:   linear
+std::vector<float> fir_8_low_linear = {
+	9.2808465594181614e-05,
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+	1.2621156486434396e-03,
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+	-1.2240466929737786e-04,
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+	-1.0612487961927145e-03,
+	-1.0825397533973879e-03,
+	-1.0002722898191827e-03,
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+	5.2597799690312659e-05,
+	8.7244796533660895e-05,
+	9.2808465594181614e-05
+};
+
+// cutoff:  0.028125 * sr
+// numTaps: 402
+// ripple:  80
+// phase: minimum
+std::vector<float> fir_16_high_minphase = {
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+};
+
+// cutoff:  0.028125 * sr
+// numTaps: 804
+// ripple:  80
+// phase:   linear
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+};
+
+// cutoff:  0.021875 * sr
+// numTaps: 98
+// ripple:  60
+// phase: minimum
+std::vector<float> fir_16_low_minphase = {
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+	4.1365707894934871e-03,
+	4.7969307703405687e-03,
+	5.2914300485077722e-03,
+	5.6212475960450356e-03,
+	5.7905204063528667e-03,
+	5.8073528110553080e-03,
+	5.6822960710145552e-03,
+	5.4295310444323862e-03,
+	5.0653534671832598e-03,
+	4.6085531844217483e-03,
+	4.0782679158956892e-03,
+	3.4941637841102127e-03,
+	2.8749959270857111e-03,
+	2.2393995365558379e-03,
+	1.6048556190928153e-03,
+	9.8827458547851021e-04,
+	4.0481413606639744e-04,
+	-1.3187346567640452e-04,
+	-6.1091868312602169e-04,
+	-1.0240390690605396e-03,
+	-1.3662018445993703e-03,
+	-1.6346397278538896e-03,
+	-1.8287603633681045e-03,
+	-1.9493426622280599e-03,
+	-1.9990711511849628e-03,
+	-1.9824509746393221e-03,
+	-1.9061890048446637e-03,
+	-1.7785124142931509e-03,
+	-1.6087484639533685e-03,
+	-1.4064929008850569e-03,
+	-1.1813470637249989e-03,
+	-9.4256626359455042e-04
+};
+
+// cutoff:  0.021875 * sr
+// numTaps: 195
+// ripple:  60
+// phase:   linear
+std::vector<float> fir_16_low_linear = {
+	4.6406350512302725e-05,
+	4.6554827062602420e-05,
+	4.3624389029543715e-05,
+	3.7044618200778362e-05,
+	2.6300100028348718e-05,
+	1.0958820312583623e-05,
+	-9.2989636518609359e-06,
+	-3.4652359343132310e-05,
+	-6.5113043115270046e-05,
+	-1.0050114198018762e-04,
+	-1.4042491927489305e-04,
+	-1.8426537060876191e-04,
+	-2.3116677834560183e-04,
+	-2.8003417534844081e-04,
+	-3.2953853194173148e-04,
+	-3.7813030543505844e-04,
+	-4.2406178181615662e-04,
+	-4.6541839836751497e-04,
+	-5.0015896924819722e-04,
+	-5.2616444992933183e-04,
+	-5.4129457822660516e-04,
+	-5.4345142784508534e-04,
+	-5.3064861380453584e-04,
+	-5.0108460722860339e-04,
+	-4.5321835929638358e-04,
+	-3.8584521008158109e-04,
+	-2.9817087653823875e-04,
+	-1.8988118331660482e-04,
+	-6.1205127693790174e-05,
+	8.7031138304048973e-05,
+	2.5336176503197079e-04,
+	4.3565232612359544e-04,
+	6.3108662343493887e-04,
+	8.3617092095002600e-04,
+	1.0467570093525482e-03,
+	1.2580850973105821e-03,
+	1.4648470648899511e-03,
+	1.6612701083396427e-03,
+	1.8412202650038201e-03,
+	1.9983247450917371e-03,
+	2.1261114275366324e-03,
+	2.2181633151920170e-03,
+	2.2682852057079946e-03,
+	2.2706793343151041e-03,
+	2.2201262988592210e-03,
+	2.1121672005066598e-03,
+	1.9432826391518124e-03,
+	1.7110640027185389e-03,
+	1.4143723942915242e-03,
+	1.0534805580650589e-03,
+	6.3019329954705071e-04,
+	1.4794214952948385e-04,
+	-3.8814960578747759e-04,
+	-9.7123491841188112e-04,
+	-1.5927467903638364e-03,
+	-2.2424400051362101e-03,
+	-2.9084721028967836e-03,
+	-3.5775240775331690e-03,
+	-4.2349603772314504e-03,
+	-4.8650268635811534e-03,
+	-5.4510844488597178e-03,
+	-5.9758752098080931e-03,
+	-6.4218168919418428e-03,
+	-6.7713208941768445e-03,
+	-7.0071280814699901e-03,
+	-7.1126561341291264e-03,
+	-7.0723516253674576e-03,
+	-6.8720396400502159e-03,
+	-6.4992635209499810e-03,
+	-5.9436072643748354e-03,
+	-5.1969931912348522e-03,
+	-4.2539477949767946e-03,
+	-3.1118291127273183e-03,
+	-1.7710095746438211e-03,
+	-2.3500904894905683e-04,
+	1.4894262974820404e-03,
+	3.3923026784192937e-03,
+	5.4604171368528584e-03,
+	7.6774567887004331e-03,
+	1.0024158632651404e-02,
+	1.2478528418934461e-02,
+	1.5016115797219065e-02,
+	1.7610341726319201e-02,
+	2.0232872954908707e-02,
+	2.2854037301067002e-02,
+	2.5443272495368190e-02,
+	2.7969600531186505e-02,
+	3.0402118807646105e-02,
+	3.2710498872326250e-02,
+	3.4865483285526050e-02,
+	3.6839371044256823e-02,
+	3.8606482126164195e-02,
+	4.0143592040470771e-02,
+	4.1430327799141770e-02,
+	4.2449517436447801e-02,
+	4.3187486094082572e-02,
+	4.3634292732958123e-02,
+	4.3783902709019495e-02,
+	4.3634292732958123e-02,
+	4.3187486094082572e-02,
+	4.2449517436447801e-02,
+	4.1430327799141770e-02,
+	4.0143592040470771e-02,
+	3.8606482126164195e-02,
+	3.6839371044256823e-02,
+	3.4865483285526050e-02,
+	3.2710498872326250e-02,
+	3.0402118807646105e-02,
+	2.7969600531186505e-02,
+	2.5443272495368190e-02,
+	2.2854037301067002e-02,
+	2.0232872954908707e-02,
+	1.7610341726319201e-02,
+	1.5016115797219065e-02,
+	1.2478528418934461e-02,
+	1.0024158632651404e-02,
+	7.6774567887004331e-03,
+	5.4604171368528584e-03,
+	3.3923026784192937e-03,
+	1.4894262974820404e-03,
+	-2.3500904894905683e-04,
+	-1.7710095746438211e-03,
+	-3.1118291127273183e-03,
+	-4.2539477949767946e-03,
+	-5.1969931912348522e-03,
+	-5.9436072643748354e-03,
+	-6.4992635209499810e-03,
+	-6.8720396400502159e-03,
+	-7.0723516253674576e-03,
+	-7.1126561341291264e-03,
+	-7.0071280814699901e-03,
+	-6.7713208941768445e-03,
+	-6.4218168919418428e-03,
+	-5.9758752098080931e-03,
+	-5.4510844488597178e-03,
+	-4.8650268635811534e-03,
+	-4.2349603772314504e-03,
+	-3.5775240775331690e-03,
+	-2.9084721028967836e-03,
+	-2.2424400051362101e-03,
+	-1.5927467903638364e-03,
+	-9.7123491841188112e-04,
+	-3.8814960578747759e-04,
+	1.4794214952948385e-04,
+	6.3019329954705071e-04,
+	1.0534805580650589e-03,
+	1.4143723942915242e-03,
+	1.7110640027185389e-03,
+	1.9432826391518124e-03,
+	2.1121672005066598e-03,
+	2.2201262988592210e-03,
+	2.2706793343151041e-03,
+	2.2682852057079946e-03,
+	2.2181633151920170e-03,
+	2.1261114275366324e-03,
+	1.9983247450917371e-03,
+	1.8412202650038201e-03,
+	1.6612701083396427e-03,
+	1.4648470648899511e-03,
+	1.2580850973105821e-03,
+	1.0467570093525482e-03,
+	8.3617092095002600e-04,
+	6.3108662343493887e-04,
+	4.3565232612359544e-04,
+	2.5336176503197079e-04,
+	8.7031138304048973e-05,
+	-6.1205127693790174e-05,
+	-1.8988118331660482e-04,
+	-2.9817087653823875e-04,
+	-3.8584521008158109e-04,
+	-4.5321835929638358e-04,
+	-5.0108460722860339e-04,
+	-5.3064861380453584e-04,
+	-5.4345142784508534e-04,
+	-5.4129457822660516e-04,
+	-5.2616444992933183e-04,
+	-5.0015896924819722e-04,
+	-4.6541839836751497e-04,
+	-4.2406178181615662e-04,
+	-3.7813030543505844e-04,
+	-3.2953853194173148e-04,
+	-2.8003417534844081e-04,
+	-2.3116677834560183e-04,
+	-1.8426537060876191e-04,
+	-1.4042491927489305e-04,
+	-1.0050114198018762e-04,
+	-6.5113043115270046e-05,
+	-3.4652359343132310e-05,
+	-9.2989636518609359e-06,
+	1.0958820312583623e-05,
+	2.6300100028348718e-05,
+	3.7044618200778362e-05,
+	4.3624389029543715e-05,
+	4.6554827062602420e-05,
+	4.6406350512302725e-05
+};
+
diff --git a/libraries/Resample/build.sh b/libraries/Resample/build.sh
new file mode 100755
index 000000000..19b3c2e35
--- /dev/null
+++ b/libraries/Resample/build.sh
@@ -0,0 +1,2 @@
+cd "$(dirname "$0")"
+../../bela-remote-tools/Bela/scripts/build_project.sh . --force -c '--period 16' -m 'LDFLAGS=-L./libraries/ne10 LDLIBS=-lNE10 CPPFLAGS="-D PIMP_WITH_NE10=1 -D PIMP_USE_DOUBLES=0 -I./libraries/ne10" CFLAGS="-D PIMP_WITH_NE10=1 -D PIMP_USE_DOUBLES=0 -I./libraries/ne10"'
\ No newline at end of file
diff --git a/libraries/Resample/design_fir.py b/libraries/Resample/design_fir.py
new file mode 100644
index 000000000..9f3d76d30
--- /dev/null
+++ b/libraries/Resample/design_fir.py
@@ -0,0 +1,73 @@
+# %% import scipy.signal as sig
+import matplotlib.pyplot as plt
+import numpy as np
+import scipy.signal as sig
+import os
+
+fs = 1                                 # samplerate
+ripple = {"high": 80, "low": 60}       # stopband attenuation and passband ripple
+cutoff_ny = {"high": 0.9, "low": 0.7}  # cutoff relative to nyquist
+
+fname = f"aa_fir.h"
+try:
+    os.remove(fname)
+except FileNotFoundError:
+    pass
+file = open(fname, "a")
+
+file.write("#include <vector>\n\n")
+
+for down in [2, 4, 8, 16]:
+    for quality in ripple:
+        nyquist_resampled = fs/down/2            # new nyquist
+        cutoff = 0.5/down * cutoff_ny[quality]   # filter cutoff
+        width = (nyquist_resampled - cutoff)*2   # filter transition bandwidth
+
+        # design kaiser such that stopband starts at nyquist
+        numtaps, beta = sig.kaiserord(ripple[quality], width/(0.5*fs))
+        taps = sig.firwin(numtaps, cutoff, window=('kaiser', beta), fs=fs)
+        tapsmin = sig.minimum_phase(taps)
+
+        w, h = sig.freqz(taps, worN=8000)
+        w, hmin = sig.freqz(taps, worN=8000)
+
+        f = w * 0.5*fs/np.pi  # Convert w to Hz.
+
+        plt.figure(1)
+        plt.plot(f, 20*np.log10(np.abs(h)))
+        plt.plot(f, 20*np.log10(np.abs(hmin)))
+
+        plt.vlines(cutoff, -129, 0)
+        plt.vlines(cutoff+width/2, -129, 0)
+        plt.vlines(cutoff-width/2, -129, 0)
+        plt.vlines(nyquist_resampled, -129, 0)
+
+        plt.figure(2)
+        plt.plot(taps)
+        plt.plot(tapsmin)
+
+        plt.figure(3)
+        plt.plot(f, 20*np.log10(np.abs(h)))
+        plt.plot(f, 20*np.log10(np.abs(hmin)))
+        plt.ylim(-10, 2)
+
+        file.write(f"// cutoff:  {cutoff} * sr\n")
+        file.write(f"// numTaps: {len(tapsmin)}\n")
+        file.write(f"// ripple:  {ripple[quality]}\n")
+        file.write(f"// phase: minimum\n")
+        file.write(f"std::vector<float> fir_{down}_{quality}_minphase = "+"{\n")
+        for tap in tapsmin[:-1]:
+            file.write(f"\t{tap:.16e},\n")
+        file.write(f"\t{tapsmin[-1]:.16e}" + '\n};\n\n')
+
+        file.write(f"// cutoff:  {cutoff} * sr\n")
+        file.write(f"// numTaps: {numtaps}\n")
+        file.write(f"// ripple:  {ripple[quality]}\n")
+        file.write(f"// phase:   linear\n")
+        file.write(f"std::vector<float> fir_{down}_{quality}_linear = "+"{\n")
+        for tap in taps[:-1]:
+            file.write(f"\t{tap:.16e},\n")
+        file.write(f"\t{taps[-1]:.16e}" + '\n};\n\n')
+
+file.close()
+plt.show()
diff --git a/libraries/Resample/lib.metadata b/libraries/Resample/lib.metadata
new file mode 100644
index 000000000..bc4dec756
--- /dev/null
+++ b/libraries/Resample/lib.metadata
@@ -0,0 +1,17 @@
+name=Resample
+version=1.0.0
+author=Franz Heuchel<franz.heuchel@gmail.com>
+maintainer=Giulio Moro<giuliomoro@yahoo.it>
+description=Decimating and interpolating filters. This is a wrapper for the libne10 FIR filter.
+examples=Audio/resample
+license=LGPL 3.0
+url=
+board=*
+dependencies=
+LDFLAGS=
+LDLIBS=
+CXXFLAGS=
+CC=
+CXX=
+CFLAGS=
+CPPFLAGS=
diff --git a/libraries/Resample/render.cpp b/libraries/Resample/render.cpp
new file mode 100644
index 000000000..db92f3f24
--- /dev/null
+++ b/libraries/Resample/render.cpp
@@ -0,0 +1,86 @@
+/*
+* Play noise through loudspeaker and record at mic or record signal of two mics.
+*/
+
+#include <Bela.h>
+#include <libraries/AudioFile/AudioFile.h>
+#include <libraries/Scope/Scope.h>
+
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <cmath>
+#include <cassert>
+#include <fstream>
+#include <random>
+
+#include "Resample.h"
+
+// Parameters
+const int decFac = 4;
+const uint gInChannel = 0;
+
+DecimatorChannel decimator;
+InterpolatorChannel interpolator;
+
+Scope scope;
+// Scope scope_down;
+
+float *x;
+float *y;
+float *xhat;
+
+std::default_random_engine       generator;
+std::normal_distribution<float>* distribution = new std::normal_distribution<float>(0, 0.01);
+
+uint sr;
+uint blockSize;
+uint blockSizeResampled;
+
+bool setup(BelaContext *context, void *userData)
+{
+	sr = context->audioSampleRate/decFac;
+	blockSize = context->audioFrames;
+	blockSizeResampled = blockSize/decFac;
+
+	scope.setup(2, sr);
+	// scope_down.setup(1, sr/decFac);
+	decimator.setup(decFac, blockSize, FIR_HIGH, LINEAR);
+	interpolator.setup(decFac, blockSizeResampled, FIR_HIGH, LINEAR);
+
+	x = new float[blockSize]();
+	y = new float[blockSizeResampled]();
+	xhat = new float[blockSize]();
+
+	return true;
+}
+
+float phase = 0;
+float freq = 44100./100. * 2 * M_PI;
+void render(BelaContext *context, void *userData)
+{
+
+	for (unsigned int n = 0; n < context->audioFrames; ++n) {
+		// x[n] = audioRead(context, n, gInChannel);
+		x[n] = sin(phase);
+		phase += freq / sr;
+	}
+	if (phase > 2 * M_PI) phase -= 2 * M_PI;
+
+	decimator.process(y, x);
+	interpolator.process(xhat, y);
+
+	for (unsigned int n = 0; n < blockSize; ++n) {
+		scope.log(x[n], xhat[n]);
+	}
+
+	// for (int n = 0; n < blockSizeResampled; ++n)
+	// {
+	// 	scope_down.log(y[n]);
+	// }
+
+}
+
+void cleanup(BelaContext *context, void *userData)
+{
+}
\ No newline at end of file

From c8913a68f86a691695cf99339bf36bbaf3d6e332 Mon Sep 17 00:00:00 2001
From: fhchl <fhchl@users.noreply.github.com>
Date: Sat, 20 Nov 2021 17:37:23 +0100
Subject: [PATCH 2/4] fixes + comments

move example
---
 examples/Audio/order.json          |    3 +-
 examples/Audio/resample/render.cpp |   67 +
 libraries/Resample/Resample.cpp    |  178 +-
 libraries/Resample/Resample.h      |   48 +
 libraries/Resample/Resampler.h     |   41 -
 libraries/Resample/aa_fir.h        | 2542 ++++++++++++++--------------
 libraries/Resample/build.sh        |    2 -
 libraries/Resample/design_fir.py   |   23 +-
 libraries/Resample/lib.metadata    |    6 +-
 libraries/Resample/render.cpp      |   86 -
 10 files changed, 1528 insertions(+), 1468 deletions(-)
 create mode 100644 examples/Audio/resample/render.cpp
 create mode 100644 libraries/Resample/Resample.h
 delete mode 100644 libraries/Resample/Resampler.h
 delete mode 100755 libraries/Resample/build.sh
 delete mode 100644 libraries/Resample/render.cpp

diff --git a/examples/Audio/order.json b/examples/Audio/order.json
index 9769c0d49..d2d9551e6 100644
--- a/examples/Audio/order.json
+++ b/examples/Audio/order.json
@@ -9,5 +9,6 @@
   "filterbanks",
   "FFT-phase-vocoder",
   "sample-streamer",
-  "sample-streamer-multi"
+  "sample-streamer-multi",
+  "resample"
 ]
diff --git a/examples/Audio/resample/render.cpp b/examples/Audio/resample/render.cpp
new file mode 100644
index 000000000..2a6a4567a
--- /dev/null
+++ b/examples/Audio/resample/render.cpp
@@ -0,0 +1,67 @@
+/*
+* Play noise through loudspeaker and record at mic or record signal of two mics.
+*/
+
+#include <Bela.h>
+#include <libraries/AudioFile/AudioFile.h>
+#include <libraries/Scope/Scope.h>
+
+#include "Resample.h"
+
+const unsigned int gDecimationFactor = 4;
+const unsigned int gInputChannel     = 0;
+const unsigned int gOutputChannel    = 0;
+
+Scope        scope;
+Decimator    decimator;
+Interpolator interpolator;
+
+float* x;
+float* y;
+
+unsigned int blockSize;
+unsigned int blockSizeResampled;
+
+bool setup(BelaContext* context, void* userData) {
+    unsigned int sampleRateResampled = context->audioSampleRate / gDecimationFactor;
+
+    blockSize           = context->audioFrames;
+    blockSizeResampled  = blockSize / gDecimationFactor;
+
+    scope.setup(2, sampleRateResampled);
+    if(decimator.setup(gDecimationFactor, blockSize, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
+		return false;
+	};
+	if (interpolator.setup(gDecimationFactor, blockSizeResampled, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
+		return false;
+	};
+
+    x = new float[blockSize]();
+    y = new float[blockSizeResampled]();
+
+    return true;
+}
+
+void  render(BelaContext* context, void* userData) {
+    for (unsigned int n = 0; n < blockSize; ++n) {
+        x[n] = audioRead(context, n, gInputChannel);
+    }
+
+    // downsample
+    decimator.process(y, x);
+
+    // do some processing at a lower sampling rate
+    for (unsigned int n = 0; n < blockSizeResampled; n++) {
+        y[n] *= 2;
+    }
+
+    // upsample
+    interpolator.process(x, y);
+
+	for (unsigned int n = 0; n < blockSize; ++n) {
+        audioWrite(context, n, gOutputChannel, x[n]);
+    }
+}
+
+void cleanup(BelaContext* context, void* userData) {
+}
\ No newline at end of file
diff --git a/libraries/Resample/Resample.cpp b/libraries/Resample/Resample.cpp
index e4ddd3c14..13a9f7e42 100644
--- a/libraries/Resample/Resample.cpp
+++ b/libraries/Resample/Resample.cpp
@@ -1,53 +1,68 @@
 #include <iostream>
-#include <math.h> // ceil
-#include <string.h>
+#include <math.h>    // ceil
+#include <string.h>  // memcpy
+
+#define ENABLE_NE10_FIR_DECIMATE_FLOAT_NEON // Defines needed for Ne10 library
+#define ENABLE_NE10_FIR_INTERPOLATE_FLOAT_NEON
+#include <libraries/ne10/NE10.h> // neon library, must be included before `Resample.h` (or anything else that #includes NE10.h)
 
 #include "Resample.h"
 #include "aa_fir.h"
 
-std::vector<float> get_fir(unsigned int factor, enum fir_quality quality, enum fir_phase phase) {
-    if (factor == 2 && quality == FIR_HIGH && phase == MINIMUM)
+std::vector<float> ResampleBase::get_fir(unsigned int factor, fir_quality quality, fir_phase phase) {
+    if (factor == 2 && quality == high && phase == minimum)
         return fir_2_high_minphase;
-    else if (factor == 2 && quality == FIR_HIGH && phase == LINEAR)
+    else if (factor == 2 && quality == high && phase == linear)
         return fir_2_high_linear;
-    else if (factor == 2 && quality == FIR_LOW && phase == MINIMUM)
+    else if (factor == 2 && quality == low && phase == minimum)
         return fir_2_low_minphase;
-    else if (factor == 2 && quality == FIR_LOW && phase == LINEAR)
+    else if (factor == 2 && quality == low && phase == linear)
         return fir_2_low_linear;
-    else if (factor == 4 && quality == FIR_HIGH && phase == MINIMUM)
+    else if (factor == 4 && quality == high && phase == minimum)
         return fir_4_high_minphase;
-    else if (factor == 4 && quality == FIR_HIGH && phase == LINEAR)
+    else if (factor == 4 && quality == high && phase == linear)
         return fir_4_high_linear;
-    else if (factor == 4 && quality == FIR_LOW && phase == MINIMUM)
+    else if (factor == 4 && quality == low && phase == minimum)
         return fir_4_low_minphase;
-    else if (factor == 4 && quality == FIR_LOW && phase == LINEAR)
+    else if (factor == 4 && quality == low && phase == linear)
         return fir_4_low_linear;
-    else if (factor == 8 && quality == FIR_HIGH && phase == MINIMUM)
+    else if (factor == 8 && quality == high && phase == minimum)
         return fir_8_high_minphase;
-    else if (factor == 8 && quality == FIR_HIGH && phase == LINEAR)
+    else if (factor == 8 && quality == high && phase == linear)
         return fir_8_high_linear;
-    else if (factor == 8 && quality == FIR_LOW && phase == MINIMUM)
+    else if (factor == 8 && quality == low && phase == minimum)
         return fir_8_low_minphase;
-    else if (factor == 8 && quality == FIR_LOW && phase == LINEAR)
+    else if (factor == 8 && quality == low && phase == linear)
         return fir_8_low_linear;
-    else if (factor == 16 && quality == FIR_HIGH && phase == MINIMUM)
+    else if (factor == 16 && quality == high && phase == minimum)
         return fir_16_high_minphase;
-    else if (factor == 16 && quality == FIR_HIGH && phase == LINEAR)
+    else if (factor == 16 && quality == high && phase == linear)
         return fir_16_high_linear;
-    else if (factor == 16 && quality == FIR_LOW && phase == MINIMUM)
+    else if (factor == 16 && quality == low && phase == minimum)
         return fir_16_low_minphase;
-    else if (factor == 16 && quality == FIR_LOW && phase == LINEAR)
+    else if (factor == 16 && quality == low && phase == linear)
         return fir_16_low_linear;
     else {
-        std::cerr << "get_fir: invalid combination" << std::endl;
+        std::cerr << "get_fir: invalid combination " << factor << quality << phase << std::endl;
         return std::vector<float>();
     }
 }
 
-int DecimatorChannel::setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality, enum fir_phase phase) {
+void ResampleBase::cleanup() {
+    NE10_FREE(pCoeff);
+    NE10_FREE(pState);
+    pCoeff = nullptr;
+    pState = nullptr;
+}
+
+int Decimator::setup(unsigned int decimationFactor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
     cleanup();
-    this->blockSize            = blockSize;
-    this->decimationFactor     = decimationFactor;
+    this->blockSizeIn = blockSize;
+    this->factor      = decimationFactor;
+    if (decimationFactor == 1) {
+        // Don't do anything
+        return 0;
+    }
     std::vector<float> fir     = get_fir(decimationFactor, quality, phase);
     uint               numTaps = fir.size();
 
@@ -70,41 +85,44 @@ int DecimatorChannel::setup(unsigned int decimationFactor, unsigned int blockSiz
     return 0;
 }
 
-void DecimatorChannel::process(ne10_float32_t* outBlock, ne10_float32_t* inBlock) {
-    ne10_fir_decimate_float_neon(&decimator, inBlock, outBlock, blockSize);
-}
-
-void DecimatorChannel::cleanup() {
-    NE10_FREE(pCoeff);
-    NE10_FREE(pState);
-    pCoeff = nullptr;
-    pState = nullptr;
+void Decimator::process(ne10_float32_t* outBlock, const ne10_float32_t* inBlock) {
+    if (factor == 1 && outBlock != inBlock) {
+        memcpy(outBlock, inBlock, blockSizeIn * sizeof *outBlock);
+        return;
+    }
+    ne10_fir_decimate_float_neon(&decimator, (float*)inBlock, outBlock, blockSizeIn);
 }
 
-int InterpolatorChannel::setup(unsigned int interpolationFactor, unsigned int blockSize, enum fir_quality quality, enum fir_phase phase) {
+int Interpolator::setup(unsigned int L, unsigned int blockSize, fir_quality quality, fir_phase phase) {
     cleanup();
-    this->blockSize             = blockSize;
-    this->interpolationFactor   = interpolationFactor;
-    std::vector<float> fir      = get_fir(interpolationFactor, quality, phase);
+    this->blockSizeIn = blockSize / L;
+    this->factor      = L;
+    if (L == 1) {
+        // Don't do anything
+        return 0;
+    }
+    std::vector<float> fir      = get_fir(L, quality, phase);
     uint               filtSize = fir.size();
     // numTaps must be a multiple of the interpolation factor
-    uint numTaps = ceil((float)filtSize / interpolationFactor) * interpolationFactor;
-
-    pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
-    pState = (ne10_float32_t*)NE10_MALLOC(
-        (blockSize + numTaps / interpolationFactor - 1) * sizeof(ne10_float32_t));
-    if (!pState || !pCoeff)
+    uint numTaps     = ceil((float)filtSize / L) * L;
+    uint phaseLength = numTaps / L;
+    pCoeff           = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
+    pState           = (ne10_float32_t*)NE10_MALLOC(
+        (blockSizeIn + phaseLength - 1) * sizeof(ne10_float32_t));
+    if (!pState || !pCoeff) {
         return -1;
+    }
 
     for (unsigned int n = 0; n < filtSize; ++n) {
         // reverse fir coefficients
         pCoeff[numTaps - filtSize + n] = fir[filtSize - 1 - n];
     }
     for (uint n = 0; n < numTaps - filtSize; ++n) {
+        // rest are are zeros
         pCoeff[n] = 0;
     }
 
-    int err = ne10_fir_interpolate_init_float(&Interpolator, interpolationFactor, numTaps, pCoeff, pState, blockSize);
+    int err = ne10_fir_interpolate_init_float(&interpolator, L, numTaps, pCoeff, pState, blockSizeIn);
     if (err) {
         std::cerr << "Error: couldn't init interpolator" << std::endl;
         return -1;
@@ -113,15 +131,12 @@ int InterpolatorChannel::setup(unsigned int interpolationFactor, unsigned int bl
     return 0;
 }
 
-void InterpolatorChannel::process(ne10_float32_t* outBlock, ne10_float32_t* inBlock) {
-    ne10_fir_interpolate_float_neon(&Interpolator, inBlock, outBlock, blockSize);
-}
-
-void InterpolatorChannel::cleanup() {
-    NE10_FREE(pCoeff);
-    NE10_FREE(pState);
-    pCoeff = nullptr;
-    pState = nullptr;
+void Interpolator::process(ne10_float32_t* outBlock, const ne10_float32_t* inBlock) {
+    if (factor == 1 && outBlock != inBlock) {
+        memcpy(outBlock, inBlock, blockSizeIn * sizeof *outBlock);
+        return;
+    }
+    ne10_fir_interpolate_float_neon(&interpolator, (float*)inBlock, outBlock, blockSizeIn);
 }
 
 #if 0
@@ -129,7 +144,62 @@ void InterpolatorChannel::cleanup() {
 #include <assert.h>
 bool DecimatorTest()
 {
-    // TODO
-    return false;
+	std::vector<std::vector<float>> irs(2);
+	const unsigned int len = 1000;
+	for(unsigned int n = 0; n < len; ++n) {
+		float val = (len - n) / (float)len;
+		irs[0].push_back(val);
+		irs[1].push_back(-val);
+	}
+	Decimator c;
+	Decimator d;
+	const unsigned int blockSize = 16;
+	c.setup(irs, blockSize);
+	d.setup(irs, blockSize);
+	const unsigned int outChannels = 3;
+	for(int inChannels = 1; inChannels < 5; ++inChannels)
+	{
+		const unsigned int numFrames = 3 * len;
+		// interleaved buffers
+		std::vector<float> outs(numFrames * outChannels);
+		std::vector<float> douts(numFrames * outChannels);
+		std::vector<float> ins(numFrames * inChannels);
+		// ins contains impulses
+		for(unsigned int n = 0; n < inChannels; ++n)
+			ins[n] = n + 1;
+		for(unsigned int n = 0; n < numFrames - blockSize; n += blockSize) {
+			unsigned int outOffset = n * outChannels;
+			unsigned int inOffset = n * inChannels;
+			c.processInterleaved(outs.data() + outOffset, ins.data() + inOffset,
+					blockSize, outChannels, inChannels);
+			for(unsigned int i = 0; i < inChannels && i < d.getChannels(); ++i)
+			{
+				float out[blockSize];
+				float in[blockSize];
+				for(unsigned int k = 0; k < blockSize; ++k)
+					in[k] = ins[numFrames + k * inChannels + i];
+				d.process(out, in, blockSize, i);
+				for(unsigned int k = 0; k < blockSize; ++k)
+					outs[numFrames + k * inChannels + i] = out[k];
+			}
+		}
+		for(unsigned int n = 0; n < numFrames; ++n)
+		{
+			for(unsigned int i = 0; i < outChannels; ++i) {
+				float expected;
+				if(i < irs.size() && n < irs[i].size() && i < inChannels)
+					expected = irs[i][n] * (i + 1);
+				else
+					expected = 0;
+				float out = outs[n * outChannels + i];
+				float dout = outs[n * outChannels + i];
+				if(out != expected || dout != expected) {
+					fprintf(stderr, "error at n: %d, ch: %d. inChannels: %d, inVal: %f, expected: %f, got: %f, dgot: %f\n", n, i, inChannels, ins[n * inChannels +i], expected, out, dout);
+					assert(false);
+				}
+			}
+		}
+	}
+	return true;
 }
 #endif
diff --git a/libraries/Resample/Resample.h b/libraries/Resample/Resample.h
new file mode 100644
index 000000000..5451aad43
--- /dev/null
+++ b/libraries/Resample/Resample.h
@@ -0,0 +1,48 @@
+#include <libraries/ne10/NE10.h>
+#include <vector>
+
+// Abstract base class for decimator and intepolator
+class ResampleBase {
+public:
+    enum fir_quality { high,
+                       low };
+    enum fir_phase { minimum,
+                     linear };
+    ~ResampleBase() { cleanup(); };
+    virtual int  setup(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) = 0;
+    virtual void process(float* outBlock, const float* inBlock)                                           = 0;
+
+protected:
+    std::vector<float> get_fir(unsigned int factor, fir_quality quality, fir_phase phase);
+    void            cleanup();
+    unsigned int    blockSizeIn;
+    unsigned int    factor;
+    ne10_float32_t* pCoeff = nullptr;
+    ne10_float32_t* pState = nullptr;
+};
+
+class Decimator : public ResampleBase {
+public:
+    Decimator(){};
+    Decimator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
+        setup(factor, blockSize, quality, phase);
+    };
+    int  setup(unsigned int decimationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
+    void process(float* outBlock, const float* inBlock);
+
+private:
+    ne10_fir_decimate_instance_f32_t decimator;
+};
+
+class Interpolator : public ResampleBase {
+public:
+    Interpolator(){};
+    Interpolator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
+        setup(factor, blockSize, quality, phase);
+    };
+    int  setup(unsigned int interpolationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
+    void process(float* outBlock, const float* inBlock);
+
+private:
+    ne10_fir_interpolate_instance_f32_t interpolator;
+};
\ No newline at end of file
diff --git a/libraries/Resample/Resampler.h b/libraries/Resample/Resampler.h
deleted file mode 100644
index 3a4d54996..000000000
--- a/libraries/Resample/Resampler.h
+++ /dev/null
@@ -1,41 +0,0 @@
-#define ENABLE_NE10_FIR_DECIMATE_FLOAT_NEON // Defines needed for Ne10 library
-#define ENABLE_NE10_FIR_INTERPOLATE_FLOAT_NEON
-
-#include <libraries/ne10/NE10.h>   // neon library
-#include <vector>
-
-enum fir_quality {FIR_HIGH, FIR_LOW};
-enum fir_phase   {MINIMUM, LINEAR};
-
-class DecimatorChannel {
-public:
-	DecimatorChannel() {};
-	~DecimatorChannel() { cleanup(); };
-    int  setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality=FIR_HIGH, enum fir_phase phase=LINEAR);
-    void process(ne10_float32_t* outBlock, ne10_float32_t* inBlock);
-    void cleanup();
-
-private:
-    unsigned int                        blockSize;
-    unsigned int                        decimationFactor;
-    ne10_fir_decimate_instance_f32_t    decimator;
-    ne10_float32_t*                     pCoeff = nullptr;
-    ne10_float32_t*                     pState = nullptr;
-};
-
-
-class InterpolatorChannel {
-public:
-    InterpolatorChannel() {};
-    ~InterpolatorChannel() { cleanup(); };
-    int  setup(unsigned int decimationFactor, unsigned int blockSize, enum fir_quality quality=FIR_HIGH, enum fir_phase phase=LINEAR);
-    void process(ne10_float32_t* outBlock, ne10_float32_t* inBlock);
-    void cleanup();
-
-private:
-    unsigned int                        blockSize;
-    unsigned int                        interpolationFactor;
-    ne10_fir_interpolate_instance_f32_t Interpolator;
-    ne10_float32_t*                     pCoeff = nullptr;
-    ne10_float32_t*                     pState = nullptr;
-};
diff --git a/libraries/Resample/aa_fir.h b/libraries/Resample/aa_fir.h
index 2f2e09bc2..bbf4eafaa 100644
--- a/libraries/Resample/aa_fir.h
+++ b/libraries/Resample/aa_fir.h
@@ -5,57 +5,57 @@
 // ripple:  80
 // phase: minimum
 std::vector<float> fir_2_high_minphase = {
-	4.3706528813533388e-02,
-	1.7608030145017156e-01,
-	3.4636014443969498e-01,
-	3.9745703122665310e-01,
-	2.2599727312827095e-01,
-	-5.0700545244314728e-02,
-	-1.8244488035888839e-01,
-	-7.4669159516500702e-02,
-	9.3187301784674742e-02,
-	1.0253747728603990e-01,
-	-2.5722358011200638e-02,
-	-9.2249911120522360e-02,
-	-1.6275882808193906e-02,
-	6.8974082741580234e-02,
-	3.8423014764962016e-02,
-	-4.3753881030381296e-02,
-	-4.6675263419433274e-02,
-	2.1466355947297535e-02,
-	4.5883893687524893e-02,
-	-4.0316894009317095e-03,
-	-3.9780253249977394e-02,
-	-8.1354562312130618e-03,
-	3.1126735721632076e-02,
-	1.5441642382372417e-02,
-	-2.1894738994747878e-02,
-	-1.8708685875882959e-02,
-	1.3382931491731913e-02,
-	1.8941176582948905e-02,
-	-6.3467268381686599e-03,
-	-1.7147287605624072e-02,
-	1.0992815009898728e-03,
-	1.4236082809213312e-02,
-	2.3663969736250519e-03,
-	-1.0937691424462829e-02,
-	-4.2801464976365312e-03,
-	7.7857937253056411e-03,
-	4.9782487181761325e-03,
-	-5.0976764869728759e-03,
-	-4.8449818003182803e-03,
-	3.0273141040501410e-03,
-	4.2214390817810034e-03,
-	-1.5757761393171113e-03,
-	-3.3987591154223951e-03,
-	6.7113962149788664e-04,
-	2.5682940788608792e-03,
-	-1.8055681947046358e-04,
-	-1.8547699751203942e-03,
-	-2.2264889502389472e-05,
-	1.2994380571425194e-03,
-	6.2186460119932597e-05,
-	-9.0928107788862877e-04
+	4.3722142749386392e-02,
+	1.7614320524524416e-01,
+	3.4648387984545992e-01,
+	3.9759902073619241e-01,
+	2.2607800950842674e-01,
+	-5.0718657757082203e-02,
+	-1.8251005786751157e-01,
+	-7.4695834695210558e-02,
+	9.3220592475834141e-02,
+	1.0257410827999744e-01,
+	-2.5731547193203363e-02,
+	-9.2282866933618993e-02,
+	-1.6281697284818267e-02,
+	6.8998723382982838e-02,
+	3.8436741192205387e-02,
+	-4.3769511882573726e-02,
+	-4.6691937920674553e-02,
+	2.1474024694138283e-02,
+	4.5900285475941209e-02,
+	-4.0331297015319687e-03,
+	-3.9794464543789161e-02,
+	-8.1383625817098276e-03,
+	3.1137855590174932e-02,
+	1.5447158830833746e-02,
+	-2.1902560779260685e-02,
+	-1.8715369459070413e-02,
+	1.3387712476163978e-02,
+	1.8947943222262870e-02,
+	-6.3489941741575349e-03,
+	-1.7153413387194821e-02,
+	1.0996742137334100e-03,
+	1.4241168577628586e-02,
+	2.3672423569476801e-03,
+	-1.0941598859276747e-02,
+	-4.2816755582750620e-03,
+	7.7885751606447482e-03,
+	4.9800271722939956e-03,
+	-5.0994976060557149e-03,
+	-4.8467126455053206e-03,
+	3.0283955966671642e-03,
+	4.2229471694928307e-03,
+	-1.5763390773546517e-03,
+	-3.3999733048867297e-03,
+	6.7137938272539537e-04,
+	2.5692115889008570e-03,
+	-1.8062132247890570e-04,
+	-1.8554325822914457e-03,
+	-2.2272843521294697e-05,
+	1.2999022748010696e-03,
+	6.2208675917562749e-05,
+	-9.0960591394420012e-04
 };
 
 // cutoff:  0.225 * sr
@@ -63,108 +63,108 @@ std::vector<float> fir_2_high_minphase = {
 // ripple:  80
 // phase:   linear
 std::vector<float> fir_2_high_linear = {
-	1.2809588808484079e-05,
-	2.2257572396190979e-05,
-	-2.3909482985913336e-05,
-	-6.1981617882020452e-05,
-	2.1970937541873286e-05,
-	1.2739671389496254e-04,
-	1.3271521943359048e-05,
-	-2.1327446396811811e-04,
-	-1.0698695253503211e-04,
-	2.9944015664806447e-04,
-	2.8292217699696479e-04,
-	-3.4709267831123890e-04,
-	-5.5359210642144934e-04,
-	2.9921222955062567e-04,
-	9.0835190356575841e-04,
-	-8.6943026005468176e-05,
-	-1.3019066604756640e-03,
-	-3.5713734432907382e-04,
-	1.6466699039334061e-03,
-	1.0794905552958267e-03,
-	-1.8125694339519993e-03,
-	-2.0822840462476327e-03,
-	1.6371950950831416e-03,
-	3.3003790763007405e-03,
-	-9.4756535312468817e-04,
-	-4.5838052979045828e-03,
-	-4.0751506592246785e-04,
-	5.6908510487912118e-03,
-	2.5180561004644686e-03,
-	-6.2955262668019504e-03,
-	-5.3720827854385738e-03,
-	6.0104239738092060e-03,
-	8.8200084515865675e-03,
-	-4.4221124139289447e-03,
-	-1.2549786578044873e-02,
-	1.1313555622793894e-03,
-	1.6074724561412183e-02,
-	4.2156088798689546e-03,
-	-1.8727731920182157e-02,
-	-1.1928162907840725e-02,
-	1.9638266498467821e-02,
-	2.2351180888065980e-02,
-	-1.7622290074269353e-02,
-	-3.6146568257888839e-02,
-	1.0755051545235596e-02,
-	5.5231322813222954e-02,
-	5.3901070844156558e-03,
-	-8.6884820903499388e-02,
-	-4.8287604644234046e-02,
-	1.8034826714279473e-01,
-	4.1329665829982010e-01,
-	4.1329665829982010e-01,
-	1.8034826714279473e-01,
-	-4.8287604644234046e-02,
-	-8.6884820903499388e-02,
-	5.3901070844156558e-03,
-	5.5231322813222954e-02,
-	1.0755051545235596e-02,
-	-3.6146568257888839e-02,
-	-1.7622290074269353e-02,
-	2.2351180888065980e-02,
-	1.9638266498467821e-02,
-	-1.1928162907840725e-02,
-	-1.8727731920182157e-02,
-	4.2156088798689546e-03,
-	1.6074724561412183e-02,
-	1.1313555622793894e-03,
-	-1.2549786578044873e-02,
-	-4.4221124139289447e-03,
-	8.8200084515865675e-03,
-	6.0104239738092060e-03,
-	-5.3720827854385738e-03,
-	-6.2955262668019504e-03,
-	2.5180561004644686e-03,
-	5.6908510487912118e-03,
-	-4.0751506592246785e-04,
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+	2.5180561004644682e-03,
+	5.6908510487912109e-03,
+	-4.0751506592246774e-04,
+	-4.5838052979045819e-03,
+	-9.4756535312468795e-04,
+	3.3003790763007396e-03,
+	1.6371950950831412e-03,
+	-2.0822840462476322e-03,
+	-1.8125694339519989e-03,
+	1.0794905552958265e-03,
+	1.6466699039334057e-03,
+	-3.5713734432907376e-04,
+	-1.3019066604756638e-03,
+	-8.6943026005468162e-05,
+	9.0835190356575819e-04,
+	2.9921222955062561e-04,
+	-5.5359210642144923e-04,
+	-3.4709267831123885e-04,
+	2.8292217699696473e-04,
+	2.9944015664806441e-04,
+	-1.0698695253503209e-04,
+	-2.1327446396811805e-04,
+	1.3271521943359044e-05,
+	1.2739671389496251e-04,
+	2.1970937541873283e-05,
+	-6.1981617882020439e-05,
+	-2.3909482985913329e-05,
+	2.2257572396190976e-05,
+	1.2809588808484075e-05
 };
 
 // cutoff:  0.175 * sr
@@ -172,19 +172,19 @@ std::vector<float> fir_2_high_linear = {
 // ripple:  60
 // phase: minimum
 std::vector<float> fir_2_low_minphase = {
-	8.3910339841564929e-02,
-	2.4235249093920486e-01,
-	3.6667517585546983e-01,
-	3.2956519002993112e-01,
-	1.3629383766468631e-01,
-	-6.0147618215516924e-02,
-	-1.1712243768235857e-01,
-	-4.4270292752062311e-02,
-	3.6084768181273860e-02,
-	4.2659686554269063e-02,
-	3.2465303553767537e-03,
-	-1.7798064076355914e-02,
-	-7.1398746621870205e-03
+	8.4390544654505170e-02,
+	2.4373943363061573e-01,
+	3.6877359643824864e-01,
+	3.3145123638284485e-01,
+	1.3707382445706798e-01,
+	-6.0491832954826984e-02,
+	-1.1779270976544816e-01,
+	-4.4523644218519884e-02,
+	3.6291275262370165e-02,
+	4.2903820791367391e-02,
+	3.2651097045362509e-03,
+	-1.7899919414406294e-02,
+	-7.1807349683548419e-03
 };
 
 // cutoff:  0.175 * sr
@@ -192,32 +192,32 @@ std::vector<float> fir_2_low_minphase = {
 // ripple:  60
 // phase:   linear
 std::vector<float> fir_2_low_linear = {
-	4.7991244665945647e-04,
-	1.1780432466133804e-04,
-	-2.7183058989479095e-03,
-	-4.9820510898411956e-03,
-	7.6806349668853636e-04,
-	1.4263565931065035e-02,
-	1.7763579590002344e-02,
-	-8.0396926438541013e-03,
-	-4.8869782894521221e-02,
-	-4.8164275209873209e-02,
-	4.3960274433956462e-02,
-	2.0397260444006068e-01,
-	3.3144830307394374e-01,
-	3.3144830307394374e-01,
-	2.0397260444006068e-01,
-	4.3960274433956462e-02,
-	-4.8164275209873209e-02,
-	-4.8869782894521221e-02,
-	-8.0396926438541013e-03,
-	1.7763579590002344e-02,
-	1.4263565931065035e-02,
-	7.6806349668853636e-04,
-	-4.9820510898411956e-03,
-	-2.7183058989479095e-03,
-	1.1780432466133804e-04,
-	4.7991244665945647e-04
+	4.7991244665945653e-04,
+	1.1780432466133806e-04,
+	-2.7183058989479099e-03,
+	-4.9820510898411965e-03,
+	7.6806349668853647e-04,
+	1.4263565931065036e-02,
+	1.7763579590002347e-02,
+	-8.0396926438541030e-03,
+	-4.8869782894521228e-02,
+	-4.8164275209873215e-02,
+	4.3960274433956469e-02,
+	2.0397260444006071e-01,
+	3.3144830307394380e-01,
+	3.3144830307394380e-01,
+	2.0397260444006071e-01,
+	4.3960274433956469e-02,
+	-4.8164275209873215e-02,
+	-4.8869782894521228e-02,
+	-8.0396926438541030e-03,
+	1.7763579590002347e-02,
+	1.4263565931065036e-02,
+	7.6806349668853647e-04,
+	-4.9820510898411965e-03,
+	-2.7183058989479099e-03,
+	1.1780432466133806e-04,
+	4.7991244665945653e-04
 };
 
 // cutoff:  0.1125 * sr
@@ -225,107 +225,107 @@ std::vector<float> fir_2_low_linear = {
 // ripple:  80
 // phase: minimum
 std::vector<float> fir_4_high_minphase = {
-	9.4163733984470362e-03,
-	2.7636846126993575e-02,
-	5.7974435332447935e-02,
-	9.8567102274506047e-02,
-	1.4302670017673091e-01,
-	1.8108153025307200e-01,
-	2.0115267987015284e-01,
-	1.9420926119088161e-01,
-	1.5750421401668371e-01,
-	9.6705585069163436e-02,
-	2.5209144512277439e-02,
-	-3.9451451798271142e-02,
-	-8.1135065974570764e-02,
-	-9.0556118936076457e-02,
-	-6.8624926138222381e-02,
-	-2.6193517784686593e-02,
-	1.9818458021025331e-02,
-	5.2598023261743412e-02,
-	6.1481752768719714e-02,
-	4.5589718244665567e-02,
-	1.3559174384251445e-02,
-	-2.0397724180449071e-02,
-	-4.2484998304842002e-02,
-	-4.4819315423073713e-02,
-	-2.8250759380676577e-02,
-	-1.3905134474706301e-03,
-	2.3513561208342568e-02,
-	3.6023071273977705e-02,
-	3.1819826093003253e-02,
-	1.4137932902904115e-02,
-	-8.1847678642155246e-03,
-	-2.4953534633059934e-02,
-	-2.9216674317024516e-02,
-	-2.0093278732426598e-02,
-	-2.7431507184828498e-03,
-	1.4388689117731994e-02,
-	2.3593426717513542e-02,
-	2.1340755011867586e-02,
-	9.5650423162116291e-03,
-	-5.6026010809751689e-03,
-	-1.6956171204259879e-02,
-	-1.9586864970590347e-02,
-	-1.2987786638033108e-02,
-	-9.3992198275135992e-04,
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+	-3.7141258628221757e-03,
+	1.9031329201664045e-03,
+	6.0664184839960235e-03,
+	6.9327077795369790e-03,
+	4.4062012930448100e-03,
+	3.6486287318080456e-05,
+	-3.9025158943356343e-03,
+	-5.5622282961796015e-03,
+	-4.3837382360184468e-03,
+	-1.2298364657625212e-03,
+	2.1689938567281404e-03,
+	4.1501916380643020e-03,
+	3.9080930082837301e-03,
+	1.8131477406364044e-03,
+	-9.1568407203421350e-04,
+	-2.8789511451343956e-03,
+	-3.2130281887326464e-03,
+	-1.9466781236980866e-03,
+	1.0699943400360493e-04,
+	1.8516378493742664e-03,
+	2.4678116703205971e-03,
+	1.7994632816234807e-03,
+	3.3422798809372596e-04,
+	-1.0967375513573174e-03,
+	-1.7920582678372194e-03,
+	-1.5034788115082442e-03,
+	-5.1067321066005983e-04,
+	5.9501175819037008e-04,
+	1.2401426472734656e-03,
+	1.1700593605806402e-03,
+	5.1733742093117185e-04,
+	-2.9630987764522648e-04,
+	-8.3514100282304450e-04,
+	-8.5954101283996836e-04,
+	-4.3845089606023611e-04,
+	1.4627540679283996e-04,
+	5.5923422235784745e-04,
+	6.1149587200614360e-04,
+	3.2616648704088442e-04,
+	-8.6973064461923899e-05,
+	-3.8788837369780238e-04
 };
 
 // cutoff:  0.1125 * sr
@@ -333,208 +333,208 @@ std::vector<float> fir_4_high_minphase = {
 // ripple:  80
 // phase:   linear
 std::vector<float> fir_4_high_linear = {
-	7.9416495800456849e-06,
-	1.0666766545226993e-05,
-	7.2043011730087487e-06,
-	-3.6353664766193800e-06,
-	-1.8131391471034205e-05,
-	-2.8134351689016341e-05,
-	-2.4887624384282806e-05,
-	-4.7428612547107354e-06,
-	2.6442414095542878e-05,
-	5.3592770552911054e-05,
-	5.8740290262321940e-05,
-	3.1256326086672198e-05,
-	-2.3257904565985952e-05,
-	-8.1343812457310898e-05,
-	-1.1040887967718020e-04,
-	-8.5398600772487637e-05,
-	-5.5670617836611223e-06,
-	9.8586815867606961e-05,
-	1.7480320197427060e-04,
-	1.7349259963575045e-04,
-	7.6559756139410196e-05,
-	-8.4929420906533138e-05,
-	-2.3687835176609763e-04,
-	-2.9389784313998312e-04,
-	-2.0428288023313998e-04,
-	1.4233853594376727e-05,
-	2.6984238239051049e-04,
-	4.3199666080693709e-04,
-	3.9505914423178690e-04,
-	1.4061264603465695e-04,
-	-2.3604796053600674e-04,
-	-5.5637930898261496e-04,
-	-6.3972621854085552e-04,
-	-4.0003500421072641e-04,
-	9.1549571827174886e-05,
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-	9.0702020296232568e-04,
-	7.6805955548933874e-04,
-	2.0533118218913404e-04,
-	-5.5278091561035924e-04,
-	-1.1395832354814586e-03,
-	-1.2222266750105992e-03,
-	-6.8200695126052367e-04,
-	2.9145850209503794e-04,
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 // cutoff:  0.0875 * sr
@@ -542,31 +542,31 @@ std::vector<float> fir_4_high_linear = {
 // ripple:  60
 // phase: minimum
 std::vector<float> fir_4_low_minphase = {
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+	-4.3278192196016009e-03
 };
 
 // cutoff:  0.0875 * sr
@@ -631,208 +631,208 @@ std::vector<float> fir_4_low_linear = {
 // ripple:  80
 // phase: minimum
 std::vector<float> fir_8_high_minphase = {
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 };
 
 // cutoff:  0.05625 * sr
@@ -1250,55 +1250,55 @@ std::vector<float> fir_8_high_linear = {
 // ripple:  60
 // phase: minimum
 std::vector<float> fir_8_low_minphase = {
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+	-3.1343133502732641e-03,
+	-2.2597806752086232e-03
 };
 
 // cutoff:  0.04375 * sr
@@ -1411,408 +1411,408 @@ std::vector<float> fir_8_low_linear = {
 // ripple:  80
 // phase: minimum
 std::vector<float> fir_16_high_minphase = {
-	1.9502841566188191e-03,
-	2.2937520731843302e-03,
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-	2.4489328684201353e-02,
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 };
 
 // cutoff:  0.028125 * sr
@@ -2631,104 +2631,104 @@ std::vector<float> fir_16_high_linear = {
 // ripple:  60
 // phase: minimum
 std::vector<float> fir_16_low_minphase = {
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+	-1.2489366479739484e-02,
+	-1.1398690025996448e-02,
+	-1.0150197146788746e-02,
+	-8.7808070161144343e-03,
+	-7.3274440942774190e-03,
+	-5.8278030496305847e-03,
+	-4.3166653366115615e-03,
+	-2.8273862240471076e-03,
+	-1.3900201370477901e-03,
+	-3.3311284810244704e-05,
+	1.2178772699450902e-03,
+	2.3418009813401496e-03,
+	3.3222749926971338e-03,
+	4.1470310377197403e-03,
+	4.8090608870810722e-03,
+	5.3048106177270467e-03,
+	5.6354621830032002e-03,
+	5.8051630376269349e-03,
+	5.8220380068448631e-03,
+	5.6966650327518577e-03,
+	5.4432608330343751e-03,
+	5.0781623509947070e-03,
+	4.6202069461306937e-03,
+	4.0885807322124761e-03,
+	3.5029995619525280e-03,
+	2.8822659999497282e-03,
+	2.2450623612050922e-03,
+	1.6089138569418196e-03,
+	9.9077365971315381e-04,
+	4.0583779952200799e-04,
+	-1.3220693735031737e-04,
+	-6.1246352821553028e-04,
+	-1.0266285818238557e-03,
+	-1.3696565927830522e-03,
+	-1.6387732815107677e-03,
+	-1.8333847946472089e-03,
+	-1.9542720129300281e-03,
+	-2.0041262515392098e-03,
+	-1.9874640471446384e-03,
+	-1.9110092318325525e-03,
+	-1.7830097823484082e-03,
+	-1.6128165457348520e-03,
+	-1.4100495340530637e-03,
+	-1.1843343650808236e-03,
+	-9.4494975407220230e-04
 };
 
 // cutoff:  0.021875 * sr
diff --git a/libraries/Resample/build.sh b/libraries/Resample/build.sh
deleted file mode 100755
index 19b3c2e35..000000000
--- a/libraries/Resample/build.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-cd "$(dirname "$0")"
-../../bela-remote-tools/Bela/scripts/build_project.sh . --force -c '--period 16' -m 'LDFLAGS=-L./libraries/ne10 LDLIBS=-lNE10 CPPFLAGS="-D PIMP_WITH_NE10=1 -D PIMP_USE_DOUBLES=0 -I./libraries/ne10" CFLAGS="-D PIMP_WITH_NE10=1 -D PIMP_USE_DOUBLES=0 -I./libraries/ne10"'
\ No newline at end of file
diff --git a/libraries/Resample/design_fir.py b/libraries/Resample/design_fir.py
index 9f3d76d30..ceaba58cb 100644
--- a/libraries/Resample/design_fir.py
+++ b/libraries/Resample/design_fir.py
@@ -1,14 +1,13 @@
-# %% import scipy.signal as sig
 import matplotlib.pyplot as plt
 import numpy as np
 import scipy.signal as sig
 import os
 
-fs = 1                                 # samplerate
+sr = 1                                 # samplerate
 ripple = {"high": 80, "low": 60}       # stopband attenuation and passband ripple
 cutoff_ny = {"high": 0.9, "low": 0.7}  # cutoff relative to nyquist
 
-fname = f"aa_fir.h"
+fname = "aa_fir.h"
 try:
     os.remove(fname)
 except FileNotFoundError:
@@ -19,19 +18,22 @@
 
 for down in [2, 4, 8, 16]:
     for quality in ripple:
-        nyquist_resampled = fs/down/2            # new nyquist
-        cutoff = 0.5/down * cutoff_ny[quality]   # filter cutoff
-        width = (nyquist_resampled - cutoff)*2   # filter transition bandwidth
+        nyquist_resampled = sr/down/2                 # new nyquist
+        cutoff = 0.5 * sr/down * cutoff_ny[quality]   # filter cutoff
+        width = (nyquist_resampled - cutoff)*2     # filter transition bandwidth
 
         # design kaiser such that stopband starts at nyquist
-        numtaps, beta = sig.kaiserord(ripple[quality], width/(0.5*fs))
-        taps = sig.firwin(numtaps, cutoff, window=('kaiser', beta), fs=fs)
+        numtaps, beta = sig.kaiserord(ripple[quality], width/(0.5*sr))
+        taps = sig.firwin(numtaps, cutoff, window=('kaiser', beta), fs=sr)
         tapsmin = sig.minimum_phase(taps)
 
+        taps = taps/np.sum(taps)
+        tapsmin = tapsmin/np.sum(tapsmin)
+
         w, h = sig.freqz(taps, worN=8000)
         w, hmin = sig.freqz(taps, worN=8000)
 
-        f = w * 0.5*fs/np.pi  # Convert w to Hz.
+        f = w * 0.5*sr/np.pi  # Convert w to Hz.
 
         plt.figure(1)
         plt.plot(f, 20*np.log10(np.abs(h)))
@@ -51,6 +53,7 @@
         plt.plot(f, 20*np.log10(np.abs(hmin)))
         plt.ylim(-10, 2)
 
+        print("fac", down, "\tQ", quality, "\tcut", cutoff)
         file.write(f"// cutoff:  {cutoff} * sr\n")
         file.write(f"// numTaps: {len(tapsmin)}\n")
         file.write(f"// ripple:  {ripple[quality]}\n")
@@ -70,4 +73,4 @@
         file.write(f"\t{taps[-1]:.16e}" + '\n};\n\n')
 
 file.close()
-plt.show()
+plt.show()
\ No newline at end of file
diff --git a/libraries/Resample/lib.metadata b/libraries/Resample/lib.metadata
index bc4dec756..8ed4bf5bd 100644
--- a/libraries/Resample/lib.metadata
+++ b/libraries/Resample/lib.metadata
@@ -1,9 +1,9 @@
-name=Resample
+name=Resampling
 version=1.0.0
 author=Franz Heuchel<franz.heuchel@gmail.com>
 maintainer=Giulio Moro<giuliomoro@yahoo.it>
-description=Decimating and interpolating filters. This is a wrapper for the libne10 FIR filter.
-examples=Audio/resample
+description=Decimation and interpolation filters. This is a wrapper for the libne10 FIR filter.
+examples=Audio/resampling
 license=LGPL 3.0
 url=
 board=*
diff --git a/libraries/Resample/render.cpp b/libraries/Resample/render.cpp
deleted file mode 100644
index db92f3f24..000000000
--- a/libraries/Resample/render.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
-* Play noise through loudspeaker and record at mic or record signal of two mics.
-*/
-
-#include <Bela.h>
-#include <libraries/AudioFile/AudioFile.h>
-#include <libraries/Scope/Scope.h>
-
-#include <vector>
-#include <string>
-#include <algorithm>
-#include <cmath>
-#include <cassert>
-#include <fstream>
-#include <random>
-
-#include "Resample.h"
-
-// Parameters
-const int decFac = 4;
-const uint gInChannel = 0;
-
-DecimatorChannel decimator;
-InterpolatorChannel interpolator;
-
-Scope scope;
-// Scope scope_down;
-
-float *x;
-float *y;
-float *xhat;
-
-std::default_random_engine       generator;
-std::normal_distribution<float>* distribution = new std::normal_distribution<float>(0, 0.01);
-
-uint sr;
-uint blockSize;
-uint blockSizeResampled;
-
-bool setup(BelaContext *context, void *userData)
-{
-	sr = context->audioSampleRate/decFac;
-	blockSize = context->audioFrames;
-	blockSizeResampled = blockSize/decFac;
-
-	scope.setup(2, sr);
-	// scope_down.setup(1, sr/decFac);
-	decimator.setup(decFac, blockSize, FIR_HIGH, LINEAR);
-	interpolator.setup(decFac, blockSizeResampled, FIR_HIGH, LINEAR);
-
-	x = new float[blockSize]();
-	y = new float[blockSizeResampled]();
-	xhat = new float[blockSize]();
-
-	return true;
-}
-
-float phase = 0;
-float freq = 44100./100. * 2 * M_PI;
-void render(BelaContext *context, void *userData)
-{
-
-	for (unsigned int n = 0; n < context->audioFrames; ++n) {
-		// x[n] = audioRead(context, n, gInChannel);
-		x[n] = sin(phase);
-		phase += freq / sr;
-	}
-	if (phase > 2 * M_PI) phase -= 2 * M_PI;
-
-	decimator.process(y, x);
-	interpolator.process(xhat, y);
-
-	for (unsigned int n = 0; n < blockSize; ++n) {
-		scope.log(x[n], xhat[n]);
-	}
-
-	// for (int n = 0; n < blockSizeResampled; ++n)
-	// {
-	// 	scope_down.log(y[n]);
-	// }
-
-}
-
-void cleanup(BelaContext *context, void *userData)
-{
-}
\ No newline at end of file

From 8692c19677f067b84719e413821970e536b93942 Mon Sep 17 00:00:00 2001
From: fhchl <fhchl@users.noreply.github.com>
Date: Sun, 2 Jan 2022 18:04:32 +0100
Subject: [PATCH 3/4] improve example

---
 examples/Audio/resample/render.cpp | 105 +++++++++++++++++++----------
 1 file changed, 69 insertions(+), 36 deletions(-)

diff --git a/examples/Audio/resample/render.cpp b/examples/Audio/resample/render.cpp
index 2a6a4567a..5aceb9590 100644
--- a/examples/Audio/resample/render.cpp
+++ b/examples/Audio/resample/render.cpp
@@ -1,66 +1,99 @@
 /*
-* Play noise through loudspeaker and record at mic or record signal of two mics.
+ ____  _____ _        _
+| __ )| ____| |      / \
+|  _ \|  _| | |     / _ \
+| |_) | |___| |___ / ___ \
+|____/|_____|_____/_/   \_\
+http://bela.io
+*/
+/**
+\example Audio/resample/render.cpp
+
+Downsample a signal to process it at a lower sample rate.
+=========================================================
+
+This project downsamples a source signal, does some processing at the a lower
+sample rate and then upsamples the processed signal again such that it can be
+send to the output channel.
+The source signal is a simple sine tone. The original signal and the downsampled
+signal are send to the scope and can be compared there. Note that the resampling
+introduces a small delay due to the anti-aliasing filter that is applied both
+during decimation (downsampling) and interpolation (upsampling).
+By changing the global variable gDecimationFactor, you can decide the ratio between
+the original samplerate and the samplerate after downsampling.
 */
 
 #include <Bela.h>
 #include <libraries/AudioFile/AudioFile.h>
+#include <libraries/Resample/Resample.h>
 #include <libraries/Scope/Scope.h>
 
-#include "Resample.h"
-
+const float gFrequency = 440.0;
 const unsigned int gDecimationFactor = 4;
-const unsigned int gInputChannel     = 0;
-const unsigned int gOutputChannel    = 0;
+const unsigned int gOutputChannel = 0;
 
-Scope        scope;
-Decimator    decimator;
+Scope scope;
+Decimator decimator;
 Interpolator interpolator;
 
-float* x;
-float* y;
+unsigned int gBlockSizeResampled;
+float gPhase;
+float gInverseSampleRate;
 
-unsigned int blockSize;
-unsigned int blockSizeResampled;
+float sinetone() {
+	float out = 0.8f * sinf(gPhase);
+	gPhase += 2.0f * (float)M_PI * gFrequency * gInverseSampleRate;
+	if (gPhase > M_PI)
+		gPhase -= 2.0f * (float)M_PI;
+	return out;
+}
 
 bool setup(BelaContext* context, void* userData) {
-    unsigned int sampleRateResampled = context->audioSampleRate / gDecimationFactor;
+	gBlockSizeResampled = context->audioFrames / gDecimationFactor;
+	scope.setup(2, context->audioSampleRate);
 
-    blockSize           = context->audioFrames;
-    blockSizeResampled  = blockSize / gDecimationFactor;
-
-    scope.setup(2, sampleRateResampled);
-    if(decimator.setup(gDecimationFactor, blockSize, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
+	if (decimator.setup(gDecimationFactor, context->audioFrames, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
 		return false;
 	};
-	if (interpolator.setup(gDecimationFactor, blockSizeResampled, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
+	if (interpolator.setup(gDecimationFactor, gBlockSizeResampled, ResampleBase::fir_quality::high, ResampleBase::fir_phase::linear)) {
 		return false;
 	};
 
-    x = new float[blockSize]();
-    y = new float[blockSizeResampled]();
+	gInverseSampleRate = 1.0 / context->audioSampleRate;
+	gPhase = 0.0;
 
-    return true;
+	return true;
 }
 
-void  render(BelaContext* context, void* userData) {
-    for (unsigned int n = 0; n < blockSize; ++n) {
-        x[n] = audioRead(context, n, gInputChannel);
-    }
+void render(BelaContext* context, void* userData) {
+
+	// source is a sine tone
+	float inOutBuf[context->audioFrames];
+	for (unsigned int n = 0; n < context->audioFrames; ++n) {
+		inOutBuf[n] = sinetone();
+	}
+
+	// downsample
+	float downsampledBuf[gBlockSizeResampled];
+	decimator.process(downsampledBuf, inOutBuf);
 
-    // downsample
-    decimator.process(y, x);
+	// do some processing at a lower sampling rate
+	for (unsigned int n = 0; n < gBlockSizeResampled; n++) {
+		downsampledBuf[n] *= 1;  // obviously this doen't do anything
+	}
 
-    // do some processing at a lower sampling rate
-    for (unsigned int n = 0; n < blockSizeResampled; n++) {
-        y[n] *= 2;
-    }
+	// inspect source and resampled signal in scope
+	for (unsigned int n = 0; n < context->audioFrames; n++) {
+		scope.log(inOutBuf[n], downsampledBuf[n / gDecimationFactor]);
+	}
 
-    // upsample
-    interpolator.process(x, y);
+	// upsample before output
+	interpolator.process(inOutBuf, downsampledBuf);
 
-	for (unsigned int n = 0; n < blockSize; ++n) {
-        audioWrite(context, n, gOutputChannel, x[n]);
-    }
+	// play at output channel
+	for (unsigned int n = 0; n < context->audioFrames; ++n) {
+		audioWrite(context, n, gOutputChannel, inOutBuf[n]);
+	}
 }
 
 void cleanup(BelaContext* context, void* userData) {

From 133485114b820971cc9348cdbbc11d432659f29c Mon Sep 17 00:00:00 2001
From: fhchl <fhchl@users.noreply.github.com>
Date: Sun, 2 Jan 2022 23:21:03 +0100
Subject: [PATCH 4/4] whitespace + sizeof()

---
 libraries/Resample/Resample.cpp | 216 ++++++++++++++++----------------
 libraries/Resample/Resample.h   |  54 ++++----
 2 files changed, 135 insertions(+), 135 deletions(-)

diff --git a/libraries/Resample/Resample.cpp b/libraries/Resample/Resample.cpp
index 13a9f7e42..99c91bf5a 100644
--- a/libraries/Resample/Resample.cpp
+++ b/libraries/Resample/Resample.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
-#include <math.h>    // ceil
-#include <string.h>  // memcpy
+#include <math.h>   // ceil
+#include <string.h> // memcpy
 
 #define ENABLE_NE10_FIR_DECIMATE_FLOAT_NEON // Defines needed for Ne10 library
 #define ENABLE_NE10_FIR_INTERPOLATE_FLOAT_NEON
@@ -10,133 +10,133 @@
 #include "aa_fir.h"
 
 std::vector<float> ResampleBase::get_fir(unsigned int factor, fir_quality quality, fir_phase phase) {
-    if (factor == 2 && quality == high && phase == minimum)
-        return fir_2_high_minphase;
-    else if (factor == 2 && quality == high && phase == linear)
-        return fir_2_high_linear;
-    else if (factor == 2 && quality == low && phase == minimum)
-        return fir_2_low_minphase;
-    else if (factor == 2 && quality == low && phase == linear)
-        return fir_2_low_linear;
-    else if (factor == 4 && quality == high && phase == minimum)
-        return fir_4_high_minphase;
-    else if (factor == 4 && quality == high && phase == linear)
-        return fir_4_high_linear;
-    else if (factor == 4 && quality == low && phase == minimum)
-        return fir_4_low_minphase;
-    else if (factor == 4 && quality == low && phase == linear)
-        return fir_4_low_linear;
-    else if (factor == 8 && quality == high && phase == minimum)
-        return fir_8_high_minphase;
-    else if (factor == 8 && quality == high && phase == linear)
-        return fir_8_high_linear;
-    else if (factor == 8 && quality == low && phase == minimum)
-        return fir_8_low_minphase;
-    else if (factor == 8 && quality == low && phase == linear)
-        return fir_8_low_linear;
-    else if (factor == 16 && quality == high && phase == minimum)
-        return fir_16_high_minphase;
-    else if (factor == 16 && quality == high && phase == linear)
-        return fir_16_high_linear;
-    else if (factor == 16 && quality == low && phase == minimum)
-        return fir_16_low_minphase;
-    else if (factor == 16 && quality == low && phase == linear)
-        return fir_16_low_linear;
-    else {
-        std::cerr << "get_fir: invalid combination " << factor << quality << phase << std::endl;
-        return std::vector<float>();
-    }
+	if (factor == 2 && quality == high && phase == minimum)
+		return fir_2_high_minphase;
+	else if (factor == 2 && quality == high && phase == linear)
+		return fir_2_high_linear;
+	else if (factor == 2 && quality == low && phase == minimum)
+		return fir_2_low_minphase;
+	else if (factor == 2 && quality == low && phase == linear)
+		return fir_2_low_linear;
+	else if (factor == 4 && quality == high && phase == minimum)
+		return fir_4_high_minphase;
+	else if (factor == 4 && quality == high && phase == linear)
+		return fir_4_high_linear;
+	else if (factor == 4 && quality == low && phase == minimum)
+		return fir_4_low_minphase;
+	else if (factor == 4 && quality == low && phase == linear)
+		return fir_4_low_linear;
+	else if (factor == 8 && quality == high && phase == minimum)
+		return fir_8_high_minphase;
+	else if (factor == 8 && quality == high && phase == linear)
+		return fir_8_high_linear;
+	else if (factor == 8 && quality == low && phase == minimum)
+		return fir_8_low_minphase;
+	else if (factor == 8 && quality == low && phase == linear)
+		return fir_8_low_linear;
+	else if (factor == 16 && quality == high && phase == minimum)
+		return fir_16_high_minphase;
+	else if (factor == 16 && quality == high && phase == linear)
+		return fir_16_high_linear;
+	else if (factor == 16 && quality == low && phase == minimum)
+		return fir_16_low_minphase;
+	else if (factor == 16 && quality == low && phase == linear)
+		return fir_16_low_linear;
+	else {
+		std::cerr << "get_fir: invalid combination " << factor << quality << phase << std::endl;
+		return std::vector<float>();
+	}
 }
 
 void ResampleBase::cleanup() {
-    NE10_FREE(pCoeff);
-    NE10_FREE(pState);
-    pCoeff = nullptr;
-    pState = nullptr;
+	NE10_FREE(pCoeff);
+	NE10_FREE(pState);
+	pCoeff = nullptr;
+	pState = nullptr;
 }
 
 int Decimator::setup(unsigned int decimationFactor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
-    cleanup();
-    this->blockSizeIn = blockSize;
-    this->factor      = decimationFactor;
-    if (decimationFactor == 1) {
-        // Don't do anything
-        return 0;
-    }
-    std::vector<float> fir     = get_fir(decimationFactor, quality, phase);
-    uint               numTaps = fir.size();
+	cleanup();
+	this->blockSizeIn = blockSize;
+	this->factor = decimationFactor;
+	if (decimationFactor == 1) {
+		// Don't do anything
+		return 0;
+	}
+	std::vector<float> fir = get_fir(decimationFactor, quality, phase);
+	uint numTaps = fir.size();
 
-    pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
-    pState = (ne10_float32_t*)NE10_MALLOC(
-        (numTaps + blockSize - 1) * sizeof(ne10_float32_t));
-    if (!pState || !pCoeff)
-        return -1;
+	pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
+	pState = (ne10_float32_t*)NE10_MALLOC(
+		(numTaps + blockSize - 1) * sizeof(ne10_float32_t));
+	if (!pState || !pCoeff)
+		return -1;
 
-    for (unsigned int n = 0; n < numTaps; ++n) {
-        // reverse filter coefficients
-        pCoeff[n] = fir[numTaps - 1 - n];
-    }
-    int err = ne10_fir_decimate_init_float(&decimator, numTaps, decimationFactor, pCoeff, pState, blockSize);
-    if (err) {
-        std::cerr << "ERR: blockSize must be whole multiple of decimationFactor" << std::endl;
-        return -1;
-    }
+	for (unsigned int n = 0; n < numTaps; ++n) {
+		// reverse filter coefficients
+		pCoeff[n] = fir[numTaps - 1 - n];
+	}
+	int err = ne10_fir_decimate_init_float(&decimator, numTaps, decimationFactor, pCoeff, pState, blockSize);
+	if (err) {
+		std::cerr << "ERR: blockSize must be whole multiple of decimationFactor" << std::endl;
+		return -1;
+	}
 
-    return 0;
+	return 0;
 }
 
 void Decimator::process(ne10_float32_t* outBlock, const ne10_float32_t* inBlock) {
-    if (factor == 1 && outBlock != inBlock) {
-        memcpy(outBlock, inBlock, blockSizeIn * sizeof *outBlock);
-        return;
-    }
-    ne10_fir_decimate_float_neon(&decimator, (float*)inBlock, outBlock, blockSizeIn);
+	if (factor == 1 && outBlock != inBlock) {
+		memcpy(outBlock, inBlock, blockSizeIn * sizeof(*outBlock));
+		return;
+	}
+	ne10_fir_decimate_float_neon(&decimator, (float*)inBlock, outBlock, blockSizeIn);
 }
 
 int Interpolator::setup(unsigned int L, unsigned int blockSize, fir_quality quality, fir_phase phase) {
-    cleanup();
-    this->blockSizeIn = blockSize / L;
-    this->factor      = L;
-    if (L == 1) {
-        // Don't do anything
-        return 0;
-    }
-    std::vector<float> fir      = get_fir(L, quality, phase);
-    uint               filtSize = fir.size();
-    // numTaps must be a multiple of the interpolation factor
-    uint numTaps     = ceil((float)filtSize / L) * L;
-    uint phaseLength = numTaps / L;
-    pCoeff           = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
-    pState           = (ne10_float32_t*)NE10_MALLOC(
-        (blockSizeIn + phaseLength - 1) * sizeof(ne10_float32_t));
-    if (!pState || !pCoeff) {
-        return -1;
-    }
+	cleanup();
+	this->blockSizeIn = blockSize / L;
+	this->factor = L;
+	if (L == 1) {
+		// Don't do anything
+		return 0;
+	}
+	std::vector<float> fir = get_fir(L, quality, phase);
+	uint filtSize = fir.size();
+	// numTaps must be a multiple of the interpolation factor
+	uint numTaps = ceil((float)filtSize / L) * L;
+	uint phaseLength = numTaps / L;
+	pCoeff = (ne10_float32_t*)NE10_MALLOC(numTaps * sizeof(ne10_float32_t));
+	pState = (ne10_float32_t*)NE10_MALLOC(
+		(blockSizeIn + phaseLength - 1) * sizeof(ne10_float32_t));
+	if (!pState || !pCoeff) {
+		return -1;
+	}
 
-    for (unsigned int n = 0; n < filtSize; ++n) {
-        // reverse fir coefficients
-        pCoeff[numTaps - filtSize + n] = fir[filtSize - 1 - n];
-    }
-    for (uint n = 0; n < numTaps - filtSize; ++n) {
-        // rest are are zeros
-        pCoeff[n] = 0;
-    }
+	for (unsigned int n = 0; n < filtSize; ++n) {
+		// reverse fir coefficients
+		pCoeff[numTaps - filtSize + n] = fir[filtSize - 1 - n];
+	}
+	for (uint n = 0; n < numTaps - filtSize; ++n) {
+		// rest are are zeros
+		pCoeff[n] = 0;
+	}
 
-    int err = ne10_fir_interpolate_init_float(&interpolator, L, numTaps, pCoeff, pState, blockSizeIn);
-    if (err) {
-        std::cerr << "Error: couldn't init interpolator" << std::endl;
-        return -1;
-    }
+	int err = ne10_fir_interpolate_init_float(&interpolator, L, numTaps, pCoeff, pState, blockSizeIn);
+	if (err) {
+		std::cerr << "Error: couldn't init interpolator" << std::endl;
+		return -1;
+	}
 
-    return 0;
+	return 0;
 }
 
 void Interpolator::process(ne10_float32_t* outBlock, const ne10_float32_t* inBlock) {
-    if (factor == 1 && outBlock != inBlock) {
-        memcpy(outBlock, inBlock, blockSizeIn * sizeof *outBlock);
-        return;
-    }
-    ne10_fir_interpolate_float_neon(&interpolator, (float*)inBlock, outBlock, blockSizeIn);
+	if (factor == 1 && outBlock != inBlock) {
+		memcpy(outBlock, inBlock, blockSizeIn * sizeof(*outBlock));
+		return;
+	}
+	ne10_fir_interpolate_float_neon(&interpolator, (float*)inBlock, outBlock, blockSizeIn);
 }
 
 #if 0
diff --git a/libraries/Resample/Resample.h b/libraries/Resample/Resample.h
index 5451aad43..ff1e3510d 100644
--- a/libraries/Resample/Resample.h
+++ b/libraries/Resample/Resample.h
@@ -4,45 +4,45 @@
 // Abstract base class for decimator and intepolator
 class ResampleBase {
 public:
-    enum fir_quality { high,
-                       low };
-    enum fir_phase { minimum,
-                     linear };
-    ~ResampleBase() { cleanup(); };
-    virtual int  setup(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) = 0;
-    virtual void process(float* outBlock, const float* inBlock)                                           = 0;
+	enum fir_quality { high,
+					   low };
+	enum fir_phase { minimum,
+					 linear };
+	~ResampleBase() { cleanup(); };
+	virtual int setup(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) = 0;
+	virtual void process(float* outBlock, const float* inBlock) = 0;
 
 protected:
-    std::vector<float> get_fir(unsigned int factor, fir_quality quality, fir_phase phase);
-    void            cleanup();
-    unsigned int    blockSizeIn;
-    unsigned int    factor;
-    ne10_float32_t* pCoeff = nullptr;
-    ne10_float32_t* pState = nullptr;
+	std::vector<float> get_fir(unsigned int factor, fir_quality quality, fir_phase phase);
+	void cleanup();
+	unsigned int blockSizeIn;
+	unsigned int factor;
+	ne10_float32_t* pCoeff = nullptr;
+	ne10_float32_t* pState = nullptr;
 };
 
 class Decimator : public ResampleBase {
 public:
-    Decimator(){};
-    Decimator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
-        setup(factor, blockSize, quality, phase);
-    };
-    int  setup(unsigned int decimationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
-    void process(float* outBlock, const float* inBlock);
+	Decimator(){};
+	Decimator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
+		setup(factor, blockSize, quality, phase);
+	};
+	int setup(unsigned int decimationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
+	void process(float* outBlock, const float* inBlock);
 
 private:
-    ne10_fir_decimate_instance_f32_t decimator;
+	ne10_fir_decimate_instance_f32_t decimator;
 };
 
 class Interpolator : public ResampleBase {
 public:
-    Interpolator(){};
-    Interpolator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
-        setup(factor, blockSize, quality, phase);
-    };
-    int  setup(unsigned int interpolationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
-    void process(float* outBlock, const float* inBlock);
+	Interpolator(){};
+	Interpolator(unsigned int factor, unsigned int blockSize, fir_quality quality, fir_phase phase) {
+		setup(factor, blockSize, quality, phase);
+	};
+	int setup(unsigned int interpolationFactor, unsigned int blockSize, fir_quality quality = high, fir_phase phase = linear);
+	void process(float* outBlock, const float* inBlock);
 
 private:
-    ne10_fir_interpolate_instance_f32_t interpolator;
+	ne10_fir_interpolate_instance_f32_t interpolator;
 };
\ No newline at end of file