Adaptive differential pulse code modulation system

Details Adaptive differential pulse code modulation system Adaptive differential pulse code modulation system

1986-06-20

1988-11-29

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 8, 332 11R, 358135, H04B 1406

Patent

active

047886927

ABSTRACT:
An adaptive differential pulse code modulation system includes an adaptive quantizer and an adaptive predictor which have a coding characteristic optimized to a voice signal, and a quantizer and a predictor which have a coding characteristic optimized to a voice band MODEM signal. This system is normally used as a coding system optimized to the voice signal, and when this system detects a MODEM training signal, it becomes a coding system optimized to the MODEM signal.

REFERENCES:
patent: 4437087 (1984-03-01), Petr
patent: 4569058 (1986-02-01), Grallert
Dukhovich; "A DPCM System Based on a Composite Image Model;" Conference: NTC IEEE 1980 National Telecommunications Conference; Houston, Tex. (30 Nov.-4 Dec. 1980); pp. 36-2-1-6.
W. R. Daumer et al.: "Overview of the ADPCM Coding Algorithm", CH2064-4/84/0000-0774 1884-IEEE, pp. 774 to 777.
The Counsel CCITT vol. VIII, V29, Nov. 1980, p. 171.
Tomoyoshi Takebayashi et al.: "A 32 kps ADPCM with Improvement in Coding Characteristics for 9600 bps Modem Signal", ICASSP86 Tokyo, CH 2243-4/86/0000-2187, 1986 IEEE, pp. 2187 to 2190.

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