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Asked: 2026-05-13T13:45:36+00:00

For my current project in C++ / Qt I need a library (LGPL is

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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.

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1 Answer

  1. Editorial Team

    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))
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