H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/143, 354/68
H03M 3/04 (2006.01)
Patent
CA 1220867
ADAPTIVE DIFFERENTIAL PCM SYSTEM WITH RESIDUAL- DRIVEN ADAPTATION OF FEEDBACK PREDICTOR Abstract of the Disclosure An adaptive differential pulse code modulation system (ADPCM), with adaptive prediction, has a transmitter, which subtracts the output of its predictor from the original input signal and transmits a numeric representation of the quantized difference, and a receiver which reconstructs the original input signal by the reverse process. Mistracking, whereby the receiver fails to faithfully reproduce the original input signal because its pole-based predictor coefficients differ from those of the transmitter predictor, which can result from transmission errors when the original signal comprises two pure tones, is avoided by eliminating the dependence of the adaptation process upon the predictor output. This is achieved by deriving the coefficients using the difference signal but not the reconstructed signal. In particular, the prediction coefficients may be derived in accordance with the expression:- Image - i -
432615
Adams Thomas
Nortel Networks Limited
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