Method and apparatus for smoothing pitch-cycle waveforms

Details Method and apparatus for smoothing pitch-cycle waveforms Method and apparatus for smoothing pitch-cycle waveforms

1992-12-14

1993-11-30

Richardson, Robert L.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 49, 381 53, 395 216, 395 27, G10L 900

Patent

active

052673170

ABSTRACT:
A method and apparatus for processing a reconstructed speech signal from an analysis-by-synthesis decoder are provided to improve the quality of reconstructed speech. By operation of the invention, one or more traces in a reconstructed speech signal are identified. Traces are sequences of like-features in the reconstructed speech signal. The like-features are identified by time-distance data received from the long term predictor of the decoder. The identified traces are smoothed by one of the known smoothing techniques. A smoothed version of the reconstructed speech signal is formed by combining one or more of the smoothed traces. The original reconstructed speech signal may be that provided by a long term predictor of the decoder. Values of the reconstructed speech signal and smoothed speech signal may be combined based on a measure of periodicity in speech.

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