view README @ 8:c037af3977e1

Don't make the overlap a parameter, it's too fiddly to handle. Just choose the smallest step size that gives an integral input-frames-per-output-bin

Low-frequency spectrogram
=========================

This is a Vamp plugin that produces a spectrogram from only the
low-frequency content of a signal.

You supply a frequency range and a number of bins, and it returns a
magnitude spectrum containing the requested number of bins, spanning
the frequency range you asked for. It does this by first downsampling
the signal to an integer multiple of the maximum requested frequency,
then calculating a Hann-windowed FFT of an appropriate size and
returning a subset of its magnitudes.

Chris Cannam, March 2014