Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1997-10-17
1999-02-23
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704221, 704223, 704226, G10L 302
Patent
active
058754237
ABSTRACT:
In a variable rate speech coding method for a CELP speech coding system, an adaptive sound source vector and a first noise source vector are selected from a sound source code book and a noise source code book so that a first synthesized speech signal is obtained which has a minimum distortion relative to an input speech signal. A virtual reference speech signal is generated using a sound source signal which is produced using the adaptive sound source vector. A second noise source vector corresponding to the adaptive sound source vector is selected so that a second synthesized speech signal is obtained which has a minimum distortion relative to the virtual reference speech signal. The sending of a noise source code book index corresponding to the first noise source vector is suspended according to the quality of the second synthesized speech signal.
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Hudspeth David R.
Mitsubishi Denki & Kabushiki Kaisha
Opsasnick Michael N.
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