Coding of acoustic waveforms
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United States of America Patent
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Oct 1, 1991
Issued Date -
N/A
app pub date -
Dec 15, 1989
filing date -
Apr 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Encoding techniques and devices are based on a sinusoidal speech representation model. In one aspect of the invention, a pitch-adaptive channel encoding technique for amplitude coding varies the channel spacing in accordance with the pitch of the speaker's voice. In another aspect of the invention, a phase synthesis technique locks rapidly-varying phases into synchrony with the phase of the fundamental. Phase coding techniques which introduce a voice-dependent random phase and a pitch-adaptive quadratic phase dispersion are also performed.
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