Pulse or digital communications – Repeaters – Testing
Patent
1983-10-28
1986-06-03
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 30, 375122, 332 11D, 364724, H03M 738
Patent
active
045933987
ABSTRACT:
An adaptive differential pulse code modulation system (ADPCM), with adaptive prediction, has a transmitter, which substracts 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 ##EQU1##
REFERENCES:
patent: 4317208 (1982-02-01), Araseki et al.
patent: 4319360 (1982-03-01), Cointot
patent: 4354273 (1982-10-01), Araseki et al.
patent: 4389726 (1983-06-01), Le Guyader et al.
patent: 4475227 (1984-10-01), Belfield
Adams Thomas
Glenny Raymond C.
Griffin Robert L.
Northern Telecom Limited
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