ADPCM System for speech or like signals

Details ADPCM System for speech or like signals ADPCM System for speech or like signals

1979-09-28

1982-02-23

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

340347AD, 332 11R, H04L 2516

Patent

active

043172083

ABSTRACT:
An adaptive differential pulse code modulation (ADPCM) system includes a predictor which predicts a sample value based on past prediction errors and coefficients which are adaptively corrected to lessen the difference, i.e. the prediction error, between the predicted values and the actual values. The predictor is duplicated in the receiver, has no feedback loop and thus instability due to transmission errors is eliminated. The system can also include a second predictor whose output is combined with that of the first predictor to obtain the predicted value. The second predictor output is based on past sums of the prediction error and the predicted value and coefficients which are adaptively corrected. The second predictor is in a feedback loop but instability is prevented by choosing the coefficients used.

REFERENCES:
patent: 4071842 (1978-01-01), Tewksbury
patent: 4093962 (1978-06-01), Ishiguro et al.
patent: 4144543 (1979-03-01), Koga
IBM Technical Disclosure Bulletin, vol. 15, No. 11, Apr. 1973, pp. 3338-3341, "Adaptive Rate Delta Modulator".

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