Pulse or digital communications – Pulse code modulation – Differential
Patent
1996-05-16
1997-04-15
Chin, Wellington
Pulse or digital communications
Pulse code modulation
Differential
375249, 341 76, 341143, 395 239, 395 209, 395 292, H04B 1406, H03M 304
Patent
active
056217609
ABSTRACT:
A speech coding transmission system is disclosed in which a coder of a differential coding system quantizes a difference between a predictive value from an adaptive predictor and an input speech signal by an adaptive quantizer in accordance with the level of the latter and to send out the resulting coded signal to transmission medium, and a decoder outputs a reproduced speech signal on the basis of a residual signal obtained by inversely quantizing a received coded signal with an inverse adaptive quantizer and a predictive value from an adaptive predictor. Both or either one of the coder and the decoder includes a comparator-attenuator which attenuates the amplitude of the input signal or reproduced speech signal to a value smaller than a predetermined threshold value and applies to the amplitude-attenuated speech signal to the adaptive predictor.
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Gotoh Hiroki
Miyake Masayasu
Sasaki Seishi
Chin Wellington
Kokusai Electric Co. Ltd.
Lobato Emmanuel J.
Luther William
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