Speech coder

Details Speech coder Speech coder

1991-02-20

1993-05-04

Kemeny, Emanuel S.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 40, G10L 500

Patent

active

052088626

ABSTRACT:
A speech coder includes an LPC analyzer, a difference signal generating section, a first code book, a second code book, and a multiplexer. The LPC analyzer divides an input discrete speech signal into signal components in units of frames each having a predetermined time length, and obtains a spectrum parameter representing a spectrum envelope of the speech signal. The difference signal generating section obtains a difference signal by dividing the frame into subframes each having a predetermined time length, and predicting a pitch parameter representing a long-term correlation on the basis of a past sound source signal The first code book stores a signal formed beforehand by off line training learning based on the difference signal. The second code book stores a signal having predetermined characteristics or a signal formed beforehand by learning. The multiplexer represents a sound source signal of the speech signal by a linear combination of a signal selected from the first code book in accordance with each obtained difference signal and a signal selected from the second code book, and outputs the combination.

REFERENCES:
patent: 4852179 (1989-07-01), Fette
patent: 4980916 (1990-12-01), Zinser
patent: 5023910 (1991-06-01), Thomson
Manfred R. Schroeder et al. "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates" 1985 IEEE, pp. 937-940.
"Multi-Level Clustering of Acoustic Features for Phoneme Recognition Based on Mutual Information" by Shirai et al. CH2673-2/89/0000-0604 IEEE Feb. 1989.
ICASSP1990-1990 International Conference on Acoustics, Speech and Signal Processing, Albuquerque, New Mexico, Apr. 3-6, 1990, vol. 1, pp. 485-488, IEEE, New York, P. Dymarksi et al., "Optimal and sub-optimal algorithms for selecting the excitation in linear predictive coders".
Speech Communication, vol. 7, No. 3, Oct. 1988, pp. 305-316, Elsevier Science Publishers B.V. (North-Holland), Amsterdam, NL; W. B. Kleijn et al. "An efficient stochastically excited linear predictive coding algorithm for high quality low bit rate transmission of speech".
ICASSP1989-1989 International Conference on Acoustics, Speech and Signal Processing, Glasgow, May 23-26, 1989, vol. 1, pp. 132-135, IEEE, NY, US; J. Menez et al: "Adaptive code excited linear predictive coder (ACELPC)".
ICASSP-1988 International Conference on Acoustics, Speech and Signal Processing, NY, Apr. 11-14, 1988, vol. 1, pp. 163-166, IEEE, NY, US; G. Davidson et al. "Multiple-stage vector excitation coding of speech waveforms".
Signal Processing IV: Theories and Applications-Proceedings of EUSIPCO-88, Fourth European Signal Processing Conference, Grenoble, Sep. 5-8, 1988, vol. 2, pp. 859-862, North-Holland Publishing Co., Amsterdam, NL; D. Lin: "Vector excitation coding using a composite source model."
ICASSP1990-1990 International Conference on Acoustics, Speech and Signal Processing, Albuquerque, New Mexico, Apr. 3-6, 1990, vol. 1, pp. 461-464, IEEE, New York, US; I. A. Gerson et al.: "Vector sum excited linear prediction 9VSELP) speech coding at 8 KBS".

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