Speech encoder capable of substantially increasing a codebook si

Details Speech encoder capable of substantially increasing a codebook si Speech encoder capable of substantially increasing a codebook si

1996-07-26

1999-12-21

Knepper, David D.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704223, G01L 914, G01L 900

Patent

active

060061782

ABSTRACT:
In a speech encoder, a gain codebook switching circuit is supplied with short-term prediction gains from a short-term prediction gain calculator circuit and with mode information through an input terminal and compares the short-term prediction gains with a predetermined threshold value when the mode information indicates a predetermined mode. As a result of comparison, the gain codebook switching circuit produces gain codebook switching information which is delivered to a gain quantizer circuit. The gain codebook quantizer circuit is supplied with adaptive code vectors, excitation code vectors, impulse response information, and the gain codebook switching information, and gain code vectors from a particular gain codebook connected to one of a plurality of input terminals that is selected by the gain codebook switching information. For the excitation code vectors being selected, the gain quantizer circuit selects combinations of the excitation code vectors and the gain code vectors in the gain codebook selected by the gain codebook switching information.

REFERENCES:
patent: 4868867 (1989-09-01), Davidson et al.
patent: 5140638 (1992-08-01), Moulsley et al.
patent: 5526464 (1996-06-01), Mermelstein
patent: 5602961 (1997-02-01), Kolesnik et al.
patent: 5621852 (1997-04-01), Lin
patent: 5633980 (1997-05-01), Ozawa
patent: 5651090 (1997-07-01), Moriya et al.
patent: 5657418 (1997-08-01), Gerson et al.
patent: 5659659 (1997-08-01), Kolesnik et al.
Ozawa et al., "M-LCELP Speech Coding at 4kb/s with Multi-Mode and Multi-Codebook", IEICE Trans. Commun., vol. E77-B, No. 9, 1114-1121, Sep. 1994.
Sugamura et al., "Speech Data Compression by LSP Speech Analysis-Synthesis Technique", Transactions of the Institute of Electronics and Communication Engineers of Japan, J64-A, pp. 599-606, (1981).
Nomura et al., "LSP Coding Using VQ-SVQ with Interpolation in 4.075 KBPS M-LCELP Speech Coder", Mobile Multimedia Communications, pp. B.2.5-1 -B.2.5-4, (1993).
Taniguchi et al., "Improved Celp Speech Coding at 4 KBIT/S and Below", Proc. ISCLP, pp. 41-44, 1992.
Nakamizo, "Signal Analysis and System Identification", pp. 82-87, 1988.
Gersho et al., "Vector Quantization and Signal Compression ", Kluwer Academic Publishers, 1992, pp. 423,424 and 602-605.

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