libdsp

A library providing some common DSP functions

This was made as a standalone (no dependencies like volk required) port of GNU Radio blocks I need in some projects, but without requiring the full GNU Radio library and dependencies. Thus, this library is kept lightweight (the current .so is under 100kB), 0 dependencies apart from C++ standard ones, making it a much better choice for non-experimental projects where you want to keep things... Slim :).

All "blocks" use a similar work function, taking an input and output buffer + the input size, returning the number of output elements. Properly feeding / reading samples for the "block" to work properly is up to the user.
size_t work(TYPE_IN *in, size_t length, TYPE_OUT *out);

All credits goes to the GNU Radio and VOLK project.

Features

Currently this library contains the following "blocks" or functions (C = Complex Float, F = Float, 1st is input type 2nd output) :

• AGC, CC
• DC Blocker, CC
• Costas Loop, CC
• Clock Recovery MM, CC and FF
• Moving Average, CC and FF
• BPSK Carrier PLL (NOAA HRPT PLL), CF
• PLL Carrier Tracking, CC
• Frequency Shifter, CC
• Complex to Real, CF
• Complex to Arg, CF
• Quadrature Demod, CF
• Hilbert Transform, FC
• Rational Resampler, CCF and its low-pass FIR generator function
• Root-Raised Cosine FIR generating fuction
• Low-pass FIR generating fuction
• MMSE FIR Interpolator (required by the clock recovery), CC and FF
• Noise Source, CC and FF
• Signal Source, CC
• Random number generator (used by the Noise Source)
• FFT Window generators
• Various utils functions from VOLK and GNU Radio
• A simple generic FIFO implementation (pipe.h), utilizing OS functions

Building

This project uses CMake, so all you need to do is those commands :

mkdir build && cd build
cmake ..
sudo make install