Split matrix quantization

Details Split matrix quantization Split matrix quantization

1996-04-01

1998-10-06

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

Synthesis

704222, 704262, G10L 502

Patent

active

058192247

ABSTRACT:
A speech synthesis system in which coefficients of a speech synthesis filter are quantized. An LSP or other filter coefficient representation which evolves slowly with time is generated for each of a series of N input speech frames to produce p coefficients in respect of each frame. The coefficients related to the N frames define a p.times.N matrix, with each row of the matrix containing N coefficients and each coefficient of one row being related to a respective one of the N frames. The matrix is split into a series of submatrices each made up from one or more of the rows, and each submatrix is vector quantized independently of the other submatrices using a composite time/spectral weighting function which for example emphasises distortion associated with high energy regions of the spectrum of each of the N input speech frames and is also proportional to the energy and degree of voicing of each of the N input speech frames. A codebook index is produced which is transmitted and used at the receiver to address a receiver codebook.

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Bruhn "Matrix Product Quantization For Very-Low-Rate Speech Coding", Proceedings ICASSP-95, May 1995, pp. 724-727.
Tsao, "Matrix Quantizer Design for LPC Speech Using the Generalized Lloyd Algorithm", IEEE Transactions on Acoustics, Speech, and Signal Rpocessing, vol. ASSP-33, No. 3, Jun. 1985, pp. 537-545.
ICASSP 84, Proceedings Mar. 19-21, 1984, San Diego, California, vol. 1of 3, IEEE International Conference on Acoustics, Speech, and Signal Processing, "Line Spectrum Pair (LSP) and Speech Data Compression" Soong et al, pp. 1.10.1-1.10.4.
"Effficient Coding of LSP Parameters Using Split Matrix Quantisation", Poc. ICASSP-95, pp. 740-743, Xydeas et al., May 1995.

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