FFT

stride.utils.fft.magnitude_spectrum(signal, dt, db=True)

Calculate magnitude spectrum of a signal.

Parameters

• signal (ndarray) – Signal or array of signals.

• dt (float) – Discretisation step for the time axis.

• db (bool, optional) – Whether to calculate the spectrum in decibels, defaults to True.

Returns

• 1-dimensional array – Frequencies of the spectrum

• ndarray – Magnitude spectrum of the signal or signals.

stride.utils.fft.bandwidth(signal, dt, cutoff=- 10)

Calculate the bandwidth of a signal at a given dB level.

Parameters

• signal (ndarray) – Signal or array of signals.

• dt (float) – Discretisation step for the time axis.

• cutoff (float) – dB level to calculate bandwidth.

Returns

• float – Min frequency in the BW.

• float – Centre frequency in the BW.

• float – Max frequency in the BW.