Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission
Patent
1998-05-28
2000-10-31
Hudspeth, David R.
Data processing: speech signal processing, linguistics, language
Speech signal processing
For storage or transmission
704221, 704223, G10L 900
Patent
active
06141638&
ABSTRACT:
A speech coder (400) for coding an information signal varies the codebook configuration based on parameters inherent in the information signal. The speech coder (400) requires no additional overhead for sending of mode parameters while allowing subframe resolution. The configurations vary not only for voicing level, but also for pitch period since different physiological traits yield different codebook configurations. A dispersion matrix (406) within the speech coder (400) facilitates a codebook search which is performed on vectors whose length can be less than a subframe length. Additionally, use of the dispersion matrix (406) allows the addition of random events for very slightly voiced speech which incurs little computational overhead but produces a rich excitation.
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Ashley James Patrick
Peng Weimin
Dulaney Randi L.
Hudspeth David R.
Lerner Martin
Motorola Inc.
Sonnentag Richard A.
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