Digital speech coder having optimized signal energy parameters

Details Digital speech coder having optimized signal energy parameters Digital speech coder having optimized signal energy parameters

1994-12-22

1996-02-06

Knepper, David D.

395 232, G10L 302

Patent

active

054902304

ABSTRACT:
A speech coder and decoder methodology wherein pitch excitation and codebook excitation source energies are represented by parameters that are readily transmissible with minimal transmission capacity requirements. The parameters are the long term energy value, a short term correction factor which is applied to the long term energy value to match the short term energy, and proportionality factor(s) that specify the relative energy contribution of the excitation sources to the short term energy value.

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Schroeder et al., "Code-Excited Linear Prediction (CELP): High Quality Speech at Very Low Bit Rates", IEEE ICASSP85, Mar. 26-29, 1985, Tampa, Fla., pp. 937-940.
"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 issue of 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 by IEEE, pp. 1649-1652.
"High-Quality 4800 BPS Speech Coding for Real-Time Applications" by Daniel Lin published, 3 pages.

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