Process and device for creating comfort noise in a digital speec

Details Process and device for creating comfort noise in a digital speec Process and device for creating comfort noise in a digital speec

1996-10-11

1998-09-22

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704228, G10L 302, G10L 900

Patent

active

058129650

ABSTRACT:
A process and a device for creating comfort noise for discontinuous speech transmission in which, following the end of each detected active period, a silence descriptor frame is generated as a set of parameters describing the comfort noise. For every successive current inactive frame, the frequency spectrum is analysed and then compared with a reference spectrum stored previously. Upon identity of the reference frequency spectrum and the current frame spectrum, no new silence descriptor frame is transmitted. Upon absence of identity of these spectra, a new silence descriptor frame is transmitted.

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Freeman et al., "The Voice Activity Detector for the Pan-European Digital Cellular Mobile Telephone Service"ICASSP '89 :Acoustics, &Signal Processing Conference Processing Conference pp. 369-372.
C B Southcott et al. "Voice Control of the Pan-European Digital Mobile Radio System", Nov., 1989, IEEE, USA, pp. 1070-1074, vol. 2.
C B Southcott, "Speech Processing in the Pan-European Digital Cellular Mobile Telephone System", Dec., 1998, IEE, UK, pp. 5/1-5.
Andrew DeJaco et al., "QCELP: The North American CDMA Digital Cellular Variable Rate Speech Coding Standard", Proc. IEEE, Workshop on Speech Coding for Telecomm, Quebec, Oct. 1993, pp. 5-6.
Antony Crossman, "A High Performance Audio Codec For Videoconferencing", ICSPAT, Santa Clara, Oct. 93, pp. 1039-1042.

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