Speech decoder for decoding a speech signal using a bad frame ma

Details Speech decoder for decoding a speech signal using a bad frame ma Speech decoder for decoding a speech signal using a bad frame ma

1993-12-23

1999-01-19

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704201, 704211, 704226, G10L 302

Patent

active

058625186

ABSTRACT:
A receiving unit receives input speech data on a frame-by-frame basis. An error detection unit checks whether errors exist in each frame, and outputs a signal indicative thereof to a first switch circuit. The first switch circuit outputs the input speech data to a second switch circuit if an error is detected, while it outputs the input speech data to a speech decoder unit if no error is detected. A data memory stores the input speech data after delaying the data by one frame, and outputs the delayed data to a bad frame masking unit for voiced frame, and a bad frame masking unit for unvoiced frame. The speech decoder unit decodes the input speech data by using spectral parameter data, delay of an adaptive codebook, an index of an excitation codebook, gains of the adaptive and excitation codebooks, and the amplitude of the input speech signal. The speech decoder unit outputs a decoding result to a voiced/unvoiced frame judging unit, as well as to an output terminal. The voiced/unvoiced frame judging unit determines whether a current frame is a voiced frame or an unvoiced frame, and outputs the result of the check to a second switch circuit. The second switch circuit outputs the input data to the bad frame masking unit for voiced frame if it is determined that the current frame is a voiced frame, and it outputs the input data to the bad frame masking unit for unvoiced frame if it is determined that the current frame is an unvoiced frame.

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L. DaSilva et al., "A Class-Oriented Replacement Technique for Lost Speech Packets," IEEE Infocom'89, Sep. 1989 vol. 3, pp. 1098-1105.
McLaughlin, M. J., "Channel Coding for Digital Speech Transmission in the Japanese Digital Cellular System", pp. 41-45, Chicago Corporate Research and Development Center, Motorola, Inc., Chicago, IL.

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