ADPCM Encoder/decoder with signalling bit insertion

Details ADPCM Encoder/decoder with signalling bit insertion ADPCM Encoder/decoder with signalling bit insertion

1983-11-28

1985-10-22

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

340347DD, 332 11D, 370 7, H03K 1322

Patent

active

045493049

ABSTRACT:
In an ADPCM transmission system, signalling frames of an incoming multiplexed PCM signal are identified and signalling bits extracted therefrom. During each signalling frame, an ADPCM encoder/decoder is controlled by the signalling frame signal to operate entirely for 3-bit ADPCM, instead of the regular 4-bit ADPCM, to which 3-bit ADPCM the extracted signalling bits are added for transmission. The deliberate alteration from 4-bit to 3-bit ADPCM at the encoder and decoder of the system in each signalling frame ensures proper adaptation and consequently no loss of tracking between the encoder and the decoder.

REFERENCES:
patent: 3609552 (1971-09-01), Limb
patent: 4202011 (1980-05-01), Koga
patent: 4237552 (1980-12-01), Aikoh et al.
patent: 4475213 (1984-10-01), Medaugh
patent: 4486876 (1984-12-01), Gaunt, Jr. et al.

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