scipy.signal.ShortTimeFFT.

scipy.signal.ShortTimeFFT.phase_shift

property ShortTimeFFT.phase_shift

If set, add linear phase phase_shift / mfft * f to each FFT slice of frequency f.

Shifting (more precisely rolling) an mfft-point FFT input by phase_shift samples results in a multiplication of the output by np.exp(2j*np.pi*q*phase_shift/mfft) at the frequency q * delta_f.

The default value 0 ensures that there is no phase shift on the zeroth slice (in which t=0 is centered). No phase shift (phase_shift is None) is equivalent to phase_shift = -mfft//2. In this case slices are not shifted before calculating the FFT.

The absolute value of phase_shift is limited to be less than mfft.

See also

delta_f

Width of the frequency bins of the STFT.

f

Frequencies values of the STFT.

mfft

Length of input for the FFT used

ShortTimeFFT

Class this property belongs to.