Spectrogram C++ library

user_149237 0
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For my current project in C++ / Qt I need a library (LGPL is preferred) which can calculate a spectrogram from a signal ( basically an array of doubles ). I already use Qwt for the GUI part.

Any suggestions? Thanks.

spectrogram scientific-computing spectrum fft c++
4 Answers

It would be fairly easy to put together your own spectrogram. The steps are:

  1. window function (fairly trivial, e.g. Hanning)
  2. FFT (FFTW would be a good choice but if licensing is an issue then go for Kiss FFT or similar)
  3. calculate log magnitude of frequency domain components (trivial: log(sqrt(re * re + im * im))
user_2530560

you could use fftw (fftw.org) to calculate the spectrogram, you would still need to plot the data, but that should not be a problem

user_2584180
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