systole.hrv.psd#

systole.hrv.psd(rr: Union[List, ndarray], sfreq: int = 5, method: str = 'welch', input_type: str = 'rr_ms') → Tuple[ndarray, ndarray][source]#

Extract the frequency domain features of heart rate variability.

Parameters

rr: R-R interval time-series, peaks or peaks index vectors. The default expected vector is R-R intervals in milliseconds. Other data format can be provided by specifying the “input_type” (can be “rr_s”, “peaks” or “peaks_idx”).
sfreq: The sampling frequency (Hz) of the interpolated instantaneous heart rate.
method: The method used to extract freauency power. Default is 'welch'.
input_type: The type of input provided. Can be “peaks”, “peaks_idx”, “rr_ms” or “rr_s”. Defaults to “rr_ms”.

Returns

freq, power: The frequency and power spectral density of the given signal.