Predictive communication system filtering arrangement

Details Predictive communication system filtering arrangement Predictive communication system filtering arrangement

1986-03-26

1988-02-16

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

332 11D, 381 30, H04B 1406

Patent

active

047260378

ABSTRACT:
A digital speech signal communication system includes a decoder that generates a predictively coded speech signal responsive to received digital codes and predicitve parameters corresponding thereto. A signal representative of the quality of said predictively coded speech signal is formed and the predictively coded speech signal is modified responsive to the quality representative signal and the predictive parameters, The quality representative signal may be generated by combining a signal corresponding to the step of each predictive code with the predictive parameters for the received code to form a signal representing an estimate of the noise in the predictive code.

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AT&T Bell Laboratories Technical Journal, vol. 63, No. 8, Oct. 1984, "Enhancement of ADPCM Speech by Adaptive Postfiltering", V. Ramamoorthy and N. S. Jayant, pp. 1465-1475.
The Bell System Technical Journal, vol. 52, No. 7, Sept. 1973, "Adaptive Quantization in Differential PCM Coding of Speech", P. Cummiskey, N. S. Jayant and J. L. Flanagan, pp. 1105-1119.

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