Telephonic communications – Special services – Conferencing
Patent
1993-01-26
1995-01-31
Dwyer, James L.
Telephonic communications
Special services
Conferencing
379406, 379410, 379392, 381 83, H04M 908
Patent
active
053864654
ABSTRACT:
An audio processing system for use in teleconferencing systems having high and low transmission delays. The audio processing system utilizes complementary comb filters in combination with auxiliary echo suppressors, a frequency scaler, expander/gates and automatic level controlling devices to substantially improve acoustic stability margin and reduce far-end talker echo.
REFERENCES:
patent: 3183304 (1965-05-01), Schroeder
patent: 3567873 (1971-03-01), Peroni
patent: 3622714 (1971-11-01), Berkeley et al.
patent: 3973086 (1976-08-01), May, Jr.
patent: 4008376 (1977-02-01), Flanagan et al.
patent: 4029912 (1977-06-01), Geigel et al.
patent: 4253000 (1981-02-01), Kasson
patent: 4644108 (1987-02-01), Crouse et al.
patent: 4670903 (1987-06-01), Araseki et al.
patent: 4748663 (1988-05-01), Phillips et al.
patent: 4890314 (1989-12-01), Judd et al.
patent: 4982425 (1991-01-01), Yoshida
patent: 4991166 (1991-02-01), Julstrom
patent: 4991167 (1991-02-01), Petri et al.
patent: 5029162 (1991-07-01), Epps
patent: 5271057 (1993-12-01), Addeo et al.
"Improving Audio Quality: Echo Control in Videoconferencing," G. Hill, Teleconference, Mar.-Apr. 1991, vol. 10, No. 2, pp. 29-43.
"High Quality Hands-free Telephony Using Voice Switching Optimised With Echo Cancellation," W. Armbruster, Signal Processing IV, 1988, J. L. Lacoume et al. (eds.), Elsevier Science Publishers, B.V., pp. 495-498.
"Some Aspects of Stereophony Applicable to Conference Use," F. K. Harvey et al., Journal Audio Engineering Society, Jul. 1963, vol. 11, pp. 212-217.
Addeo Eric J.
Desmarais Joseph J.
Shtirmer Gennady
Bell Communications Research Inc.
Dwyer James L.
Matar Ahmad F.
Suchyta Leonard Charles
Yeadon Loria B.
LandOfFree
Audio processing system for teleconferencing with high and low t does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Audio processing system for teleconferencing with high and low t, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio processing system for teleconferencing with high and low t will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1107273