Vector quantization in a harmonic speech coding arrangement
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United States of America Patent
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-
Jun 11, 1991
Grant Date -
N/A
app pub date -
Apr 8, 1989
filing date -
Apr 8, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A harmonic speech coding arrangement where vector quantization is used to improve speech quality. Parameters are determined at the analyzer of an illustrative coding arrangement to model the magnitude and phase spectra of the input speech. A first codebook of vectors is searched for a vector that closely approximates the difference between the true and estimated magnitude spectra. A second codebook of vectors is searched for a vector that closely approximates the difference between the true and the estimated phase spectra. Indices and scaling factors for the vectors are communicated to the synthesizer such that scaled vectors can be added into the magnitude and phase spectra for use at the synthesizer in generating speech as a sum of sinusoids.
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