Method and device for coding speech in analysis-by-synthesis...

Data processing: speech signal processing – linguistics – language – Speech signal processing – For storage or transmission

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C704S223000

Reexamination Certificate

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07089180

ABSTRACT:
The present invention discloses a method of improving the coded speech quality in low bit rate analysis-by-synthesis (AbS) speech coders. This is accomplished by relaxing the waveform matching constraints for non-stationary plosive speech segments of speech signals by suitably shifting pulse locations of the coded excitation signal. The shifting results in the coded signal having phase information that does not exactly match original signal in places where it is perceptually insignificant to the listener. Furthermore, a technique for adaptive phase dispersion is introduced to the coded excitation signal to efficiently preserve important signal characteristics such as the energy spread of the original signal.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson et al.
patent: 5187745 (1993-02-01), Yip et al.
patent: 5778334 (1998-07-01), Ozawa et al.
patent: 5809459 (1998-09-01), Bergstrom et al.
patent: 5890108 (1999-03-01), Yeldener
patent: 5970444 (1999-10-01), Hayashi et al.
patent: 6233550 (2001-05-01), Gersho et al.
patent: 6408268 (2002-06-01), Tasaki
patent: 6493664 (2002-12-01), Udaya Bhaskar et al.
patent: 6526376 (2003-02-01), Villette et al.
patent: 6556966 (2003-04-01), Gao
Granzow et al, “High-Quality Dgital Speech at 4kb/s”, Global Telecommunications Conference, 1990, GLOBECOM '90; Dec. 2-5, 1990, pp. 941-945.
Ojala, “Toll Quality Variable-Rate Speech Codec”, ICASSP 1997, vol. 2 Apr. 21-24, 1997, pp. 747-750, vol. 2.
Park et al, “On a Time Reduction of Pitch Searching by the Regular Pulse Technique in the CELP Vocoder”, vol. 1, Nov. 2-5, 1997, pp. 512-516, vol. 1.
Paksoy et al, “A Variable-Rate Multimodal Speech Coder with Gain-Matched Analysis-by-Synthesis”, ICASSP 1997, pp. 751-754, vol. 2.
Hagen et al, “Removal of Sparse-Excitation Artifacts in CELP,” International Conference on Acoustics, Speech, and Signal Processing, Seattle, May 1998, pp. 145-148.
TIA/EIA IS-641-A, TDMA Cellular/PCS—Radio Interface, Enhanced Full-Rate Voice Codec, Revision A.
“Removal of sparse-excitation artifacts in CELP,” by R. Hagen, E. Ekudden and B. Johansson and W. B. Kleijn, Proceedings ofIEEE International Conference on Acoustics, Speech, and Signal Processing, Seattle, May 1998.

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