Speech signal coding/decoding system based on the type of speech

Details Speech signal coding/decoding system based on the type of speech Speech signal coding/decoding system based on the type of speech

1991-01-17

1992-06-23

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 30, 381 47, G10L 302

Patent

active

051250306

ABSTRACT:
An input speech signal is encoded by an adaptive quantizer which quantizes the predicted residual signal between the digital input speech signal, and prediction signals provided by predictors and a shaped quantization noise provided by a noise shaping filter. An inverse quantizer, to which the encoded speech signal is supplied, is provided for noise shaping and local decoding. A noise shaping filter makes the spectrum of the quantization noise similar to that of the original digital input speech signal by using the shaping factors. The shaping factors are changed depending upon the prediction gain (ex. ratio of input speech signal to predicted residual signal or the prediction coefficients). On a decoding side of the system there are an inverse quantizer, predictors, and a post noise shaping filter. The shaping factors for the post noise shaping filter are similarly changed depending upon the prediction gain.

REFERENCES:
patent: 4617676 (1986-10-01), Jayant et al.
patent: 4726037 (1988-02-01), Jayant
patent: 4757517 (1988-07-01), Yatsuruka
patent: 4797925 (1989-01-01), Lin
patent: 4811396 (1989-03-01), Yatsuzuka
Ramamoorthy et al., "Enhancement of ADPCM Speech by Adaptive Postfiltering", ATT&T BLTJ, vol. 63, No. 8, Oct. 1984, pp. 1465-1475.
Adaptive Postfiltering of 16kb/s ADPCM Speech, IEEE 1986, pp. 829-832, N. S. Jayant et al.

Affiliated with

Also associated with

Rating

Speech signal coding/decoding system based on the type of speech does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Speech signal coding/decoding system based on the type of speech, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speech signal coding/decoding system based on the type of speech will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-939757