From 3d7e58259a88b6886851e23e96f252c3e538e933 Mon Sep 17 00:00:00 2001
From: Del Hatch <33526862+delhatch@users.noreply.github.com>
Date: Thu, 30 Nov 2017 12:24:17 -0800
Subject: [PATCH] Adding reame file.

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+# SpectrumAnalyzer
+
+A real-time analyzer (RTA) or spectrum analyzer converts a time-domain signal into a frequency-domain signal. In other words, it makes visible the amount of energy in the signal as a function of frequency.
+
+This project uses the Cyclone IV FPGA used in the DE2-115 evaluation board to:
+
+a) configure and interface to the audio codec
+
+b) buffer the audio samples into a FIFO
+
+c) feed the samples into an FFT
+
+d) collect the results into a dual-port RAM
+
+e) instantiate a Nios soft-core processor
+
+f) interface the RAM onto the Nios bus to read the resuslts
+
+g) FPGA also has a VGA frame buffer and creates the VGA waveform
+
+h) allows the Nios to draw pixels into the VGA frame buffer
+
+The Nios processor reads the FFT data, groups high frequency bins together to display the spectrum in log fashion, and then draws bars into the VGA frame buffer.