Decomposition in noise and periodic signal waveforms in waveform

Details Decomposition in noise and periodic signal waveforms in waveform Decomposition in noise and periodic signal waveforms in waveform

1994-02-08

1996-05-14

MacDonald, Allen R.

395 22, 395 23, G10L 900

Patent

active

055175953

ABSTRACT:
A method of coding a speech signal is described. In accordance with the method, a plurality of sets of indexed parameters are generated based on samples of the speech signal. Each set of indexed parameters corresponds to a waveform characterizing the speech signal at a discrete point in time. Parameters of the plurality of sets are grouped based on index value to form a first set of signals which represents the evolution of characterizing waveform shape; the signals of the first set are filtered to remove low frequency components and thereby produce a second set of signals which represents relatively high rates of evolution of characterizing waveform shape. The speech signal is then coded based on the second set of signals representing high rates of characterizing waveform shape evolution. Coding of the speech signal may further be based on a set of smoothed first signals.

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