In file ../include/sigpr/EST_filter.h:

void inv_lpc_filter_ola

(EST_Wave &sig, EST_Track &lpc,   EST_Wave &res)

Produce a residual from a track of linear prediction coefficients and a signal using an overlap add technique.

Documentation

Produce a residual from a track of linear prediction coefficients and a signal using an overlap add technique.

For each frame, the function estimates the local pitch period and picks a start point one period before the current time position and an end point one period after it.

A portion of residual corresponding to these times is then produced using inv_lpc_filter. The resultant section of residual is then overlap-added into the main residual wave object.

Parameters:

sig - the speech waveform to be filtered
lpc - a track of time positioned LP coefficients
res - the output residual waveform

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This page is part of the Edinburgh Speech Tools Library documentation
Copyright University of Edinburgh 1997
Contact: speech_tools@cstr.ed.ac.uk