Reducing artifact generation in a vocoder

Details Reducing artifact generation in a vocoder Reducing artifact generation in a vocoder

2005-10-11

2005-10-11

Ometz, David L. (Department: 2655)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S223000

Reexamination Certificate

active

06954727

ABSTRACT:
A method of reducing sinusoidal artifact generation in a vocoder. In one embodiment, the present invention first receives a determined input energy threshold value. The input energy threshold value is the value below which it is believed that a suspected noise-inducing codebook excitation vector will be generated by the vocoder. Next, provided that an input signal is received having an energy value lower than the input energy threshold value, the present invention uses a codebook excitation vector selection process to prevent the suspected noise-inducing codebook excitation vector from being continuously generated. In one embodiment, the codebook excitation vector selection process is a randomization codebook excitation vector selection process. In so doing, the present embodiment prevents the creation of harmonics during zero or low-energy input periods.

REFERENCES:
patent: 5060269 (1991-10-01), Zinser
patent: 5293449 (1994-03-01), Tzeng
patent: 5414796 (1995-05-01), Jacobs et al.
patent: 5596680 (1997-01-01), Chow et al.
patent: 5633982 (1997-05-01), Ganesan et al.
patent: 5664054 (1997-09-01), Su
patent: 5828996 (1998-10-01), Iijima et al.
patent: 5884010 (1999-03-01), Chen et al.
patent: 5909663 (1999-06-01), Iijima et al.
patent: 6018707 (2000-01-01), Nishiguchi et al.
patent: 6272459 (2001-08-01), Takahashi
patent: 6311154 (2001-10-01), Gersho et al.
patent: 6324503 (2001-11-01), Manjunath et al.
patent: 6330532 (2001-12-01), Manjunath et al.
patent: 6484138 (2002-11-01), DeJaco
patent: 660301 (1995-06-01), None
“Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems” Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems, Sep. 9, 1996, pp. A, I-XIV, 101-104, 201, 209, 301-303, XP002912397 *section “4.3.1 Estimating the Data Rate Based on Current Signal Parameters”*.
Kwon S Y et al: “A High Quality Bi-Celp Speech Coder at 8 kbit/s and Below” 1997 IEEE International Conference on Acoustics, Speech and Signal Processing (Cat. No. 97CB.36052), Munich, Germany, Apr. 21-24, 1997, pp. 759-762 vol. 2 XP000822558 1997, Los Alamitos, CA, USA, IEEE Comput. Soc. Press, USA. ISBN: 0-8186-7919-0 abstract p. 759, left-hand column., line 36 -right-hand column., line 6.

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