Adaptive differential pulse code modulation

Details Adaptive differential pulse code modulation Adaptive differential pulse code modulation

1982-12-20

1985-04-23

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 27, 375 38, H04B 1204

Patent

active

045134260

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.

REFERENCES:
patent: 2516587 (1950-07-01), Peterson
patent: 3573364 (1971-04-01), Shimamura
patent: 4005274 (1977-01-01), Vagliani et al.
patent: 4099122 (1978-07-01), Buul
patent: 4319360 (1982-03-01), Cointot
Bell System Technical Journal, "Adaptive Quantization in Differential PCM Coding of Speech" by P. Cumminskey, N. S. Jayant and J. L. Flanagan, Sep. 1973, vol. 52, No. 7, pp. 1105-1118.

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