Tunable post-filter for tandem coders

Details Tunable post-filter for tandem coders Tunable post-filter for tandem coders

1996-12-09

1997-12-02

Knepper, David D.

395 22, 395 232, 395 228, G10L 300, G10L 900

Patent

active

056945191

ABSTRACT:
An adaptive postfilter is used on the decoding side of tandem codecs (coder/decoders). Post-filter parameters are adapted using a backward synthesis filter. The parameters used are 10th order LPC (Linear Predictive Coding) predictor coefficients. The system employed uses Low-Delay Code Excited Linear Predictive codecs (LD-CELP).

REFERENCES:
patent: 3806658 (1974-04-01), Anderson
patent: 4617676 (1986-10-01), Jayant et al.
patent: 4726037 (1988-02-01), Jayant
patent: 4980916 (1990-12-01), Zinser
patent: 5054073 (1991-10-01), Yazu
patent: 5113448 (1992-05-01), Nomura et al.
patent: 5140638 (1992-08-01), Moulsley et al.
patent: 5142583 (1992-08-01), Galand et al.
patent: 5142584 (1992-08-01), Ozawa
patent: 5187735 (1993-02-01), Herrero Garcia et al.
patent: 5233660 (1993-08-01), Chen
patent: 5339384 (1994-08-01), Chen
J-H. Chen et al. "Real-Time Vector APC Speech Coding AT 4800 BPS With Adaptive Potfiltering", Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, pp. 2185-2188, Apr. 1987.
J-H. Chen, "A robust low-delay CELP speech coder at 16 kbit/s", Proc. GLOBECOM, pp. 1237-1241 (Nov. 1989).
J-H. Chen, "High Quality 16 kb/s speech coding with a one-way delay less than 2 ms," Proc. ICASSP, pp. 453-456 (Apr. 1990).
J-H. Chen, M.J. Melchner, R.V. Cox and D.O. Bowker, "Real-time implementation of a 16 kb/s low-delay CELP speech coder," Proc. ICASSP, pp. 181-184 (Apr. 1990).
"Draft Recommendation on 16 kbit/s Voice Coding", CCITT Study Group XV, Geneva, Switzerland, Nov. 11-22, 1991, 157 pages.
J.-H. Chen, Y.C. Lin, and R.V. Cox, "A fixed point 16 kb/s LD-CELP Algorithm" Proc. ICASSP, pp. 21-24 (May 1991).

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