Digital speech decoder having a postfilter with reduced spectral

Details Digital speech decoder having a postfilter with reduced spectral Digital speech decoder having a postfilter with reduced spectral

1992-04-13

1993-08-31

Knepper, David D.

G10L 914

Patent

active

052416500

ABSTRACT:
An adaptive spectral postfilter in a synthesized speech platform has a denominator characteristic that corresponds to a preceding LPC filter stage, and a numerator characteristic that is developed as a function of the denominator characteristic through application of spectral smoothing techniques. This allows the numerator to track the denominator without the introduction of spectral distortion that would otherwise affect the processing in an adverse way.

REFERENCES:
patent: 4301329 (1981-11-01), Taguchi
patent: 4617676 (1986-10-01), Jayant et al.
patent: 4817157 (1989-03-01), Gerson
patent: 4852169 (1989-07-01), Veeneman et al.
"Improved Speech Quality and Efficient Vector Quantization is SELP" by W. Kleijn et al. in Apr., 1988 issue of Proceedings of the ICASSP, pp. 155-158.
"A Class of Analysis-by-Synthesis Predictive Coders for High Quality Speech Coding at Rates Between 4.8 and 16 kbits/s" by Peter Kroon and Ed Deprettere, Feb., 1988 IEEE Journal on Selected Areas in Communications, pp. 353-363.
"Quantization Procedures for the Excitation in CELP Coders" by Peter Kroon and Bishnu Atal published in Apr. of 1987, pp. 1649, 1650, and 1652.
"Real-Time Vector APC Speech Coding at 4800 BPS With Adaptive Postfiltering" by Juin-Hwey and Allen Gersho, Apr., 1987, pp. 2185-2188.
"Adaptive Postfiltering of 16 kb/s-ADPCM Speech" by N. S. Jayant and V. Ramamoorthy, Apr., 1986 issue of Proceedings of the ICASSP, pp. 829-832.
"Spectral Smoothing Technique in PARCOR Speech Analysis-Synthesis" by Yoh'ichi Tohkura et al. appeared in Dec., 1978 issue of IEEE Transactions On Acoustics, Speech, and Signal Processing, pp. 587-596.

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