obspy.signal.freqattributes.central_frequency

central_frequency(data, fs, smoothie, fk)[source]

Central frequency of a signal.

Computes the central frequency of the given data which can be windowed or not. The central frequency is a measure of the frequency where the power is concentrated. It corresponds to the second moment of the power spectral density function.

The central frequency is returned.

Parameters:

  • data (ndarray) – Data to estimate central frequency from.

  • fs – Sampling frequency in Hz.

  • smoothie – Factor for smoothing the result.

  • fk – Coefficients for calculating time derivatives (calculated via central difference).

Returns:

cfreq[, dcfreq] - Central frequency, Time derivative of center frequency (windowed only).