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    <p><a href="https://dsp.stackexchange.com/questions/2605/how-do-i-create-a-frequency-vs-time-plot">"How do I create a frequency vs time plot?"</a> lists several libraries, each of which can calculate a spectrogram from a signal.</p> <p>Copied and pasted from my own answer:</p> <p>Some source code to generate <a href="http://en.wikipedia.org/wiki/Spectrogram" rel="nofollow noreferrer">spectrograms</a> / <a href="http://en.wikipedia.org/wiki/Waterfall_plot" rel="nofollow noreferrer">waterfall plots</a> from audio data:</p> <ul> <li><a href="http://sox.sourceforge.net/" rel="nofollow noreferrer">SoX - Sound eXchange</a> includes <a href="http://sox.git.sourceforge.net/git/gitweb.cgi?p=sox/sox;a=blob;f=src/spectrogram.c;h=962199a7007dc42ecd8d2d4f6d60741d96687a53;hb=HEAD" rel="nofollow noreferrer">spectrogram source code</a></li> <li><a href="http://audacity.sourceforge.net/" rel="nofollow noreferrer">Audacity</a> includes <a href="https://code.google.com/p/audacity/source/browse/audacity-src/trunk/src/Spectrum.cpp" rel="nofollow noreferrer">spectrogram source code</a></li> <li><a href="http://www.qsl.net/in3otd/glfer.html" rel="nofollow noreferrer">glfer</a> includes waterfall spectrum display spectrum source code</li> <li>source code that uses fftw to compute the <a href="http://ofdsp.blogspot.com/2011/08/short-time-fourier-transform-with-fftw3.html" rel="nofollow noreferrer">spectrogram</a> of an audio stream</li> <li>more source code that uses OpenAL and fftw to compute the <a href="http://home.engineering.iastate.edu/~alexs/classes/2010_Spring_575/HW/HW5/OpenAL/alsgram.c" rel="nofollow noreferrer">spectrogram</a> for an audio stream</li> <li><a href="http://www.codeproject.com/Articles/22951/Sound-Activated-Recorder-with-Spectrogram-in-C" rel="nofollow noreferrer">"Sound Activated Recorder with Spectrogram in C#"</a> by Jeff Morton</li> <li><a href="http://topographica.org/" rel="nofollow noreferrer">Topographica</a> seems to include <a href="http://topographica.org/Reference_Manual/topo.pattern.basic.Spectrogram-class.html" rel="nofollow noreferrer">spectrogram source code</a></li> <li><a href="http://www.dr-lex.be/software/spectrograph.html" rel="nofollow noreferrer">SpectroGraph for iTunes</a></li> </ul> <p><a href="http://devrand.org/view/imageSpectrogram" rel="nofollow noreferrer">Image to Spectrogram</a> goes in the reverse direction from the above utilities.</p>
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