Device for improving voice signal in quality

Details Device for improving voice signal in quality Device for improving voice signal in quality

2005-05-03

2005-05-03

Dorvil, Richemond (Department: 2654)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

C375S244000, C714S746000

Reexamination Certificate

active

06889184

ABSTRACT:
Provided is a code correction circuit for presuming an error pattern of the received code when a received ADPCM code contains a click noise and correcting such error. A device for improving voice signal comprises a click noise detector (13) which judges that a received ADPCM code contains a click noise when a short interval average value of the absolute value of the received ADPCM code exceeds a predetermined value, and a code correction circuit (11) which presumes an error position of the bit of the received ADPCM code and corrects such error so as to minimize the variation in the short interval average value of the absolute value of the received ADPCM code when a transmission error is generated in the receiving ADPCM code judged to be containing a click noise.

REFERENCES:
patent: 5768291 (1998-06-01), Kelton et al.
patent: 5799039 (1998-08-01), Laird et al.
patent: 6078620 (2000-06-01), Rennig
patent: 6578162 (2003-06-01), Yung
patent: 6731635 (2004-05-01), Brueckheimer et al.
patent: 8-223126 (1996-08-01), None
Shuji Kubota et al., “Improved ADPCM voice signal transmission employing click-noise detection scheme for TDMA-TDD personal communication system”, IEEE transations on vehicular technology, vol. 46, No. 1, Feb. 1997.

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