tsm_phase_vocoder#

hmc_mir.tsm_tools.tsm_tools.tsm_phase_vocoder(x, alpha=1.0, L=2048, sr=22050)[source]#

Time stretches the input signal using the phase vocoder method.

Uses a synthesis hop size that is one-fourth the value of L. Note that this implementation allows for a non-integer analysis hop size (in samples), which ensures that the time-scale modification factor is exactly as specified.

Parameters:

  • x – the input signal

  • alpha – the time stretch factor, which is defined as the ratio of the synthesis hop size to the analysis hop size

  • L – the length of each analysis frame in samples

  • sr – sampling rate

Returns:

the time-stretched signal y.