Speech decoder and speech decoding method

Details Speech decoder and speech decoding method Speech decoder and speech decoding method

2005-01-25

2005-01-25

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C704S226000, C704S228000, C704S224000, C375S232000, C714S747000

Reexamination Certificate

active

06847928

ABSTRACT:
A decoding processing portion11of a speech decoder10is provided with an emphasis processing portion15for performing an emphasis process on signals to be processed (excited signals) SPC generated from coded speech signals BS. A counter portion17counts the number of times code errors occurred in successive frames of the coded speech signal BS, and outputs the successive frame error number. When the successive frame error number outputted form the counter portion17is less than or equal to a preset reference successive frame error number, a first switch SW1and second switch SW2are set to an emphasis processing portion15side. Accordingly, the signals to be processed SPC generated from various parameters included in the coded speech signals are supplied through the switch SW1to the emphasis processing portion15of the decoding processing portion11to perform an emphasis process. Then, the emphasized signals to be processed SEPC obtained by this emphasis process are outputted through the switch SW2to latter connected devices. As a result, decoded speech signals SP with good subjective sound quality are obtained. On the other hand, when the communication quality is degraded and the successive frame error number outputted from the counter portion17exceeds a preset reference successive frame error number, the first switch SW1and second switch SW2are set to a bypass BP side. Accordingly, the signals to be processed SPC generated from the various parameters contained in the coded speech signals are outputted to the latter connected devices without emphasis processing by the emphasis processing portion15. In this way, emphasis processing is prohibited when the successive frame error number is large, thereby reducing distortion generated in the decoded speech signals SP.

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IEEE Transactions on Speech and Audio Processing, vol. 6, No. 2, Mar. 1998, Red Salami et al., “Design and Description of CS-ACELP: A Toll Quality 8 kb/s Speech Coder”, pp. 116-130.

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