Delayed decision switched prediction multi-stage LSF vector quan

Details Delayed decision switched prediction multi-stage LSF vector quan Delayed decision switched prediction multi-stage LSF vector quan

1995-09-29

1998-06-30

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, G10L 914

Patent

active

057748390

ABSTRACT:
An apparatus and method of quantizing a sequence of input data vectors using delayed decision switched prediction and vector quantization. The method has the following steps of operation: (a) predicting a next vector element from said sequence of input data vectors to generate a set of prediction vectors; (b) subtracting the set of prediction vectors from the next vector element to generate a set of prediction error vectors; (c) multi-stage vector quantizing the set of prediction error vectors to generate a set of quantized prediction error vectors with each of the stages having at least one of the tables and local decision means to generate a final quantization error vector according to a predetermined distance measure; (d) selecting one predictor out of the set of predictors from the switched prediction step and selecting, for each of the stages, at least one entry from the set of tables of the vector quantization step according to the predetermined distance measure, generating a quantized data vector.

REFERENCES:
Allen Gersho and Robert M. Gray, Vector Quantization and Signal Compression, pp. 451-459, 487-506, 1992.
Houman Zarrinkoub and Paul Mermelstein, "Switched Prediction and Quantization of LSP Frequencies", Proceedings of IEEE ICASSP 96, pp. 757-760, May 1996.
Mei Yong, Grant Davidson, and Allen Gersho, "Encoding of LPC Spectral Parameters Using Switched-Adaptive Interframe Vector Prediction", Proceedings of IEEE ICASSP 88, pp. 402-405, Apr. 1988.
Kazunori Ozawa and Toshiki Miyano, "4kb/s Improved CELP Coder with Efficient Vector Quantization", Proceedings of IEEE ICASSP 91, pp. 213-216, Apr. 1991.

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