Telephonic communications – Special services – Conferencing
Patent
1991-10-09
1993-12-14
Dwyer, James L.
Telephonic communications
Special services
Conferencing
379390, 379392, 379406, H04M 120
Patent
active
052710572
ABSTRACT:
An audio processing system (100) for use in a teleconferencing system (10) utilizes complementary comb filters (42, 52, 220, 320) in combination with an echo suppressor (210, 310) and/or a frequency scaler (60, 120) to substantially improve acoustic stability margin and reduce far-end talker echo.
REFERENCES:
patent: 3183304 (1965-05-01), Schroeder
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 (1988-07-01), 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: 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
G. Hill, "Improving Audio Quality: Echo Control in Videoconferencing", Teleconference, Mar.-Apr. 1991, vol. 10, No. 2., pp. 29-43.
W. Armbruster, "High Quality Hands-Free Telephony Using Voice Switching Optimised With Echo Cancellation", Signal Processing IV, 1988, J. L. Lacoume et al. (eds.), Elsevier Science Publishers, B. V., pp. 495-498.
F. K. Harvey et al., "Some Aspects of Stereophony Applicable to Conference Use", Journal Audio Engineering Society, Jul. 1963, vol. 11, pp. 212-217.
Addeo Eric J.
Desmarias 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 system 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 system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Audio processing system for teleconferencing system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1712380