Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-10-28
1999-10-12
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704219, G10L 302
Patent
active
059666889
ABSTRACT:
A speech mode based multi-stage vector quantizer is disclosed which quantizes and encodes line spectral frequency (LSF) vectors that were obtained by transforming the short-term predictor filter coefficients in a speech codec that utilizes linear predictive techniques. The quantizer includes a mode classifier that classifies each speech frame of a speech signal as being associated with one of a voiced, spectrally stationary (Mode A) speech frame, a voiced, spectrally non-stationary (Mode B) speech frame and an unvoiced (Mode C) speech frame. A converter converts each speech frame of the speech signal into an LSF vector and an LSF vector quantizer includes a 12-bit, two-stage, backward predictive vector encoder that encodes the Mode A speech frames and a 22 bit, four-stage backward predictive vector encoder that encodes the Mode 13 and the Mode C speech frames.
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Nandkumar Srinivas
Swaminathan Kumar
Hudspeth David R.
Hughes Electronics Corporation
Opsasnick Michael N.
Sales Michael W.
Whelan John T.
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