H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/15, 354/68
H04J 3/02 (2006.01) H04B 14/06 (2006.01) H04J 3/16 (2006.01)
Patent
CA 1200331
ADPCM ENCODER/DECODER WITH SIGNALLING BIT INSERTION Abstract of the Disclosure 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.
442025
Munter Ernst A.
Strawczynski Leo
Weirich Andreas H.
Haley R. John
Nortel Networks Limited
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