Speech decoder for high quality reproduced speech through interp

Details Speech decoder for high quality reproduced speech through interp Speech decoder for high quality reproduced speech through interp

1991-05-28

1994-04-19

Atkinson, Charles E.

Excavating

381 46, G06F 1110, H04L 100

Patent

active

053053320

ABSTRACT:
A speech decoder includes a separating circuit, an error correction decoding circuit, an interpolating circuit, and a speech reproducing circuit. The separating circuit separates a code string of a filter parameter, a code string of a parameter associated with a pitch, and a code string of a parameter associated with an index and a gain of a codebook representing an excitation signal of speech from a received code string. The error correction decoding circuit detects a transmission error, which cannot be corrected, in the received code string. When a transmission error which cannot be corrected is detected, the interpolating circuit interpolates between parameters of past and future proper frames, thereby recovering parameters of a current frame. The speech reproducing circuit reproduces a speech signal on the basis of the interpolated parameters and other received codes.

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Manfred R. Schroeder et al., "Code-Excited Linear Prediction (CELP): High-Quality Speech at Very Low Bit Rates", CH2118-8/85/0000-0937, 1985 IEEE, pp. 937-940.
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W. B. Kleijn et al., "Improved Speech Quality and Efficient Vector Quantization in Selp", CH2561-9/88/0000-0155, 1988 IEEE, pp. 155-158.

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