Speech parameter encoding device which includes a dividing circu

Details Speech parameter encoding device which includes a dividing circu Speech parameter encoding device which includes a dividing circu

1994-02-09

1997-04-29

MacDonald, Allen R.

395 238, 395 239, 395 274, G10L 914, G10L 902, G10L 918

Patent

active

056257449

ABSTRACT:
On encoding with a smallest possible number of bits LPC parameters produced by an LPC analyzer from at least one of subframe signals of each frame signal of an input speech signal, a divider divides the LPC parameters into several parameter regions. Using vector code books loaded for each parameter region with code vectors, a vector quantizer quantizes the LPC parameters into, for use as quantized codes, indexes of selected vectors which are selected from the code vectors and of which a linear combination minimizes a quantization distortion.

REFERENCES:
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Schroeder et al., "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates", IEEE, Proceedings of ICASSP, pp. 937-940 (1985).
Tsao et al., "Matrix Quantizer Design for LPC Speech Using the Generalized Lloyd Algorithm", IEEE Transaction on Acoustics, Speech, and Signal Processing, vol. ASSP-33, No. 3, pp. 537-545 (Jun. 1985).
Kleijn et al., "Improved Speech Quality and Efficient Vector Quantization in SELP", IEEE, Proceedings of ICASSP, pp. 155-158 (1988).
Moriya et al., "Transform Coding of Speech Using a Weighted Vector Quantizer", IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, pp. 425-431 (Feb. 1988).
Sugamura et al., "Quantizer Design in LSP Speech Analysis-Synthesis", IEEE Journal on Selected Areas in Communications, vol. 6, No. 2, pp. 432-440 (Feb. 1988).
Laroia et al., "Robust and Efficient Quantization of Speech LSP Parameters Using Structured Vector Quantizers", IEEE, Proceedings of ICASSP, pp. 641-644 (May 1991).
Paliwal et al., "Efficient Vector Quantization of LPC Parameters at 24 Bits/Frame", IEEE Transactions on Speech and Audio Processing, vol. 1, No. 1, pp. 3-14 (Jan. 1993).

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