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  1. ObsPy Documentation (1.2.0)
  2. ObsPy Library Reference
  3. obspy.signal - Signal processing routines for ObsPy
  4. obspy.signal.freqattributes

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).