eelbrain.NDVar.envelope

NDVar.envelope(self, dim='time', name=None)

Compute the Hilbert envelope of a signal

Parameters:

dim : str

Dimension over which to compute the envelope (default ‘time’).

name : str

Name of the output NDVar (default is the current name).

Returns:

envelope : NDVar

NDVar with identical dimensions containing the envelope.

Notes

The Hilbert envelope is computed with scipy.signal.hilbert():

>>> numpy.abs(scipy.signal.hilbert(x))

This function can be very slow when the number of time samples is uneven.