Vocal tract prediction coefficient coding and decoding circuitry

Details Vocal tract prediction coefficient coding and decoding circuitry Vocal tract prediction coefficient coding and decoding circuitry

1996-10-29

1998-10-20

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

704219, 704261, 704262, G10L 900

Patent

active

058262210

ABSTRACT:
In vocal tract prediction coefficient coding and decoding circuitry, a vocal tract prediction coefficient converter/quantizer transforms vocal tract prediction coefficients of consecutive subframes constituting a single frame to corresponding LSP (Line Spectrum Pair) coefficients, quantizes the LSP coefficients, and thereby outputs quantized LSP coefficient values together with indexes assigned thereto. A coding mode decision assumes, e.g., three different coding modes based on the above quantized LSP coefficient values, the quantized LSP coefficient value of the fourth subframe of the previous frame, and the above indexes. The decision determines which coding mode should be used to code the current frame, and outputs mode code information and quantization code information. The circuitry is capable of reproducing high quality faithful speeches without resorting to a high mean coding rate even when the vocal tract prediction coefficient noticeably varies within the frame.

REFERENCES:
patent: 5255339 (1993-10-01), Fette et al.
patent: 5448680 (1995-09-01), Kang et al.
patent: 5657420 (1997-08-01), Jacobs et al.
Furui, Digital Speech Processing, Synthesis, and Recognition, pp. 131, 134, Jan. 1, 1989.
Toshiyuki Nomura et al. "A Study on Efficient Quantization and Interporation Methods for LSP Parameters" The Institute of Electronics,1993, A-142, pp. 1-144.

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