Vocoder for coding speech by using a correlation between spectra

Details Vocoder for coding speech by using a correlation between spectra Vocoder for coding speech by using a correlation between spectra

1997-03-10

2000-03-21

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704220, 704223, G10L 302, G10L 900

Patent

active

060412976

ABSTRACT:
A vocoder according to the present invention includes an analyzer portion and a synthesizer portion. The analyzer portion encodes an input frame of speech on the basis of a candidate excitation selected from a group of candidate excitations stored in memory. Instead of transmitting the actual candidate excitation to the synthesizer portion, the analyzer portion generates and provides to the synthesizer portion a variable length index code that identifies the selected candidate excitation. The synthesizer portion stores in memory the same plurality of candidate excitations as the analyzer portion. The synthesizer portion uses the variable length index code to obtain from its memory the candidate excitation originally selected by the analyzer portion. The synthesizer portion reconstructs the input frame of speech on the basis of the obtained candidate excitation.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson
patent: 4899385 (1990-02-01), Ketchum
patent: 5504834 (1996-04-01), Fette
Daniel W. Griffin, Jae S. Lim, "Multiband Excitation Vocoder", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 36, No. 8, Aug. 1988.
Parsons TW, voice and speech proc, ch. 10, voice encod. and synth., McGraw Hill, pp. 269, 330, Jun. 1987.
Lupini et al. "Excitation Modeling Based On Speech Residual Information" Speech Processing 1, pp. 23-26 (Mar. 1992).
Yang et al. "A 5.4 KBPS Speech Coder Based On Multi-Band Excitation And Linear Predictive Coding" Proceedings Of the Region 10th Annual International Conference, vol. 1, conf. 9, pp. 417-421 (Aug. 1994).
Griffin and Lim, Multiband Excitation Vocoder, IEEE, 1998, pp. 1223-35.

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