Decoder of adaptive differential pulse code modulation

Details Decoder of adaptive differential pulse code modulation Decoder of adaptive differential pulse code modulation

1983-12-05

1986-03-04

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

332 11D, H04B 1406

Patent

active

045743835

ABSTRACT:
A transcoder which transcodes adaptive differential pulse code modulation (ADPCM) signals to pulse code modulation (PCM) signals without cumulative transcoding noises even if mutual transcoding between ADPCM signals and non-linear PCM signals is repeatedly conducted. Two PCM signals are generated having values of one step higher and one step lower than a third PCM signal having a nominal code value. The three signals are fed to a selector, which sequentially selects one of the three. The output of the selector is then decoded and fed to one input of a subtractor, and a prediction signal is fed to the other input of the subtractor. The output of the subtractor is coded into an ADPCM signal in a step size of the input ADPCM signal. The logical value of that coded ADPCM signal is compared with the logical value of the input ADPCM signal by a comparator. A gate allows the PCM signal output from the selector to pass only when the comparator has an equal output.

REFERENCES:
patent: 3689840 (1972-09-01), Brown et al.
patent: 4385393 (1983-05-01), Chaure et al.
patent: 4411001 (1983-10-01), Van Buul et al.
patent: 4488175 (1984-12-01), Netravali

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