Comfort noise generation for digital communication systems

Details Comfort noise generation for digital communication systems Comfort noise generation for digital communication systems

1992-05-28

1996-07-16

MacDonald, Allen R.

395 223, 395 232, G10L 900

Patent

active

055375090

ABSTRACT:
A digital discontinuous cellular communication system has a transmitter that transmits two frames of data following detection of voice inactivity. A receiver includes a comfort noise generator that uses the two frames of data to output noise to the speaker during period of voice inactivity. The comfort noise generator includes synthesis codebook with samples scaled by actual background noise and excitation codebook with samples filtered and scaled by the background noise that are combined to produce comfort noise having attributes and loudness level of the received background noise prior to interruption of transmission. The scaled signals are weighted to vary the loudness level and spectral attributes.

REFERENCES:
patent: 4061878 (1977-12-01), Adoul et al.
patent: 4110560 (1978-08-01), Leary et al.
patent: 4142066 (1979-02-01), Ahamed
patent: 4528659 (1985-07-01), Jones, Jr.
patent: 4630305 (1986-12-01), Borth et al.
patent: 4754450 (1988-06-01), Lynk, Jr. et al.
patent: 5042069 (1991-08-01), Chhatwal
patent: 5060269 (1991-10-01), Zinser
patent: 5093863 (1992-03-01), Gatand et al.
patent: 5121349 (1992-06-01), Naito
patent: 5125030 (1992-06-01), Nomura et al.
patent: 5199076 (1993-03-01), Taniguchi et al.
patent: 5251261 (1993-10-01), Meyer et al.
patent: 5293449 (1994-03-01), Tzeng
patent: 5295225 (1994-03-01), Kane et al.
patent: 5329550 (1994-07-01), Rousseau et al.
patent: 5333176 (1994-07-01), Burke et al.
Southcott et al., "Voice Control of the Pan-European Digital Mobile Radio System," Globecom '89, Nov. 27-30, 1989, pp. 1070-1074.
Gruet et al., "Experiments with a Regular Pulse CELP Coder for the Pan European Half Rate Channel," ICASSP '91, May 14-17, 1991, pp. 617-620.
Southcott, "Speech Processing in the Pan-European Digital Cellular Mobile Telephone System," IEE Colloq. No. 139: Digitized Speech Comm. via Mobile Radio, Dec. 12, 1988, pp. 5/1-5.
"Comfort Noise Aspects for Full-Rate Speech Traffic Channels," GSM 06.12, version 3.0.1, European Telecommunication Standard, Feb. 1992.
"European Digital Cellular Telecommunications Systems (Phase 2); Comfort Noise Aspect for Full Rate Speech Traffic Channels (GSM 06.12)," European Telecommunication Standard Sep. 1994.
Vary et al., "Speech Codec for the European Mobile Radio System," Globecom '89, Nov. 29-30, 1989, pp. 1065-1069.
Lever et al., "RPCELP: A High Quality and Low Complexity Scheme for Narrow Band Coding of Speech," 1988 European Conf. on Electronics, Jun. 13-17, 1988, pp. 24-27.
Liu et al., "PACELP: A High Quality and Low Complexity Scheme for Narrow Band Coding of Speech," Circuits and Systems, 1991 China International Conf., Jun. 16-17, 1991, pp. 29-32.

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