mne.time_frequency.psd_array_welch#

mne.time_frequency.psd_array_welch(x, sfreq, fmin=0, fmax=inf, n_fft=256, n_overlap=0, n_per_seg=None, n_jobs=None, average='mean', window='hamming', *, verbose=None)[source]#

Compute power spectral density (PSD) using Welch’s method.

Welch’s method is described in Welch[1].

Parameters:

xarray, shape=(…, n_times): The data to compute PSD from.
sfreqfloat: The sampling frequency.
fminfloat: The lower frequency of interest.
fmaxfloat: The upper frequency of interest.
n_fftint: The length of FFT used, must be >= n_per_seg (default: 256). The segments will be zero-padded if n_fft > n_per_seg.
n_overlapint: The number of points of overlap between segments. Will be adjusted to be <= n_per_seg. The default value is 0.
n_per_segint | None: Length of each Welch segment (windowed with a Hamming window). Defaults to None, which sets n_per_seg equal to n_fft.
n_jobsint | None: The number of jobs to run in parallel. If -1, it is set to the number of CPU cores. Requires the joblib package. None (default) is a marker for ‘unset’ that will be interpreted as n_jobs=1 (sequential execution) unless the call is performed under a joblib.parallel_backend() context manager that sets another value for n_jobs.
averagestr | None: How to average the segments. If mean (default), calculate the arithmetic mean. If median, calculate the median, corrected for its bias relative to the mean. If None, returns the unaggregated segments.

New in version 0.19.0.
windowstr | float | tuple: Windowing function to use. See scipy.signal.get_window().

New in version 0.22.0.
verbosebool | str | int | None: Control verbosity of the logging output. If None, use the default verbosity level. See the logging documentation and mne.verbose() for details. Should only be passed as a keyword argument.

Returns:

psdsndarray, shape (…, n_freqs) or (…, n_freqs, n_segments): The power spectral densities. If average='mean or average='median', the returned array will have the same shape as the input data plus an additional frequency dimension. If average=None, the returned array will have the same shape as the input data plus two additional dimensions corresponding to frequencies and the unaggregated segments, respectively.
freqsndarray, shape (n_freqs,): The frequencies.

Notes

New in version 0.14.0.

References

Examples using `mne.time_frequency.psd_array_welch`#

The Spectrum and EpochsSpectrum classes: frequency-domain data

Compute Spectro-Spatial Decomposition (SSD) spatial filters

mne.time_frequency.psd_array_welch#

Examples using mne.time_frequency.psd_array_welch#

Examples using `mne.time_frequency.psd_array_welch`#