Adaptive differential pulse code modulation
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United States of America Patent
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Apr 23, 1985
Grant Date -
N/A
app pub date -
Dec 20, 1982
filing date -
Dec 20, 1982
priority date (Note) -
Expired
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Abstract
A differential pulse code modulation system is made adaptive to quantization noise in a way which permits variable-rate operation as either a conventional R-bit embedded code or as a combination of a conventional R-bit code and a further explicit noise code with instantaneous quantization. Additional improvement in signal-to-noise ratio is attainable by using a noninstantaneous variable-bit allocation procedure for equal-length sampling blocks with an averaged fixed bit code.
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