vispy.util.fourier module

vispy.util.fourier.fft_freqs(n_fft, fs)

Return frequencies for DFT

Parameters
n_fftint

Number of points in the FFT.

fsfloat

The sampling rate.

vispy.util.fourier.stft(x, n_fft=1024, step=512, fs=6.283185307179586, window='hann')

Compute the STFT

Parameters
xarray-like

1D signal to operate on. If len(x) < n_fft, x will be zero-padded to length n_fft.

n_fftint

Number of FFT points. Much faster for powers of two.

stepint | None

Step size between calculations. If None, n_fft // 2 will be used.

fsfloat

The sample rate of the data.

windowstr | None

Window function to use. Can be 'hann' for Hann window, or None for no windowing.

Returns
stftndarray

Spectrogram of the data, shape (n_freqs, n_steps).

See also

fft_freqs