Fault(?) on tfr.pitchgram

[denisb411]

[bzamecnik]

In case you provide time-domain signal as a numpy array, not reading it from an audio file, you have to specify the sample_rate manually. Default value is None, that's why you get error while dividing an integer by None.

Example:

x_pitchgram = tfr.pitchgram(tfr.SignalFrames(X[1], sample_rate=44100))

On the other hand SignalFrames.__init__() should raise an error in case sample_rate is not specified.