fft - Spectrogram C++ library -

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For my current project in C ++ / QT, I need a library (like LGPL) which can calculate spectromog from a signal (originally an array of doubles) I already have Qwt for GUI part I am using.

Any suggestions? Thank you.

It will be easy to put your own spectromomes together:

    < Li> Window function (fairly trivial, eg haining)
  1. FFT (FFTW will be a good option, but if licensing is an issue then then kiss FFT or
  2. Frequency domain components (trivial) : Calculate log magnitude of log (sqrt (again * again + im * im)

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