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# 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.