Sound compression/decompression method and system

Details Sound compression/decompression method and system Sound compression/decompression method and system

1998-08-07

2000-08-01

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

704211, 704215, 704208, G10L 2104

Patent

active

060980451

ABSTRACT:
The present invention provides a sound compression/decompression system and method which processes sound data, frame by frame, while transmitting information on special processing at the same time without degrading the bit rate. When a frame for special processing is transmitted in the form of a bit stream, this system sets the index value of the bit stream to a special value not used for normal processing, thus preventing the bit rate from being degraded. This system also contains information on special-processing in the non-index bits of the bit stream to implement various types of special processings. For example, a plurality of consecutive unvoiced frames may be transmitted in a one-frame bit stream.

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M. Serizawa et al., "4kbps Improved Pitch Prediction CELP Speech Coding with 20 msec Frame", IEICE Transactions on Information and Systems, vol. 78-D, No. 6 (Jun. 1995) pp. 758-763.
Oomuro, et al., "PSI-CELP based variable bit rate sound coding", Japan Acoustic Society, Spring-Term Lecture Paper Collection, pp. 309-310, 1994.
Furui, "Digital Sound Processing", Tokai University Publishing, pp. 99-133, Sep. 25, 1985.

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