Audio processing system for teleconferencing with high and low transmission delays
January 26, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3183304 3567873 3622714 Digital echo suppressor break-in circuitry Loudspeaking teleconferencing circuit Common control digital echo suppressor Method and system for reducing conference bridge oscillations Adaptive sub-band echo suppressor Echo canceller for attenuating acoustic echo signals on a frequency divisional manner Loudspeaking telephone instrument InventorsAssigneeApplicationNo. 008965 filed on 01/26/1993US Classes:379/202.01, Conferencing379/392, Suppression (e.g., antisidetone)381/83Feedback suppressionExaminersPrimary: Dwyer, James L.Assistant: Matar, Ahmad F. Attorney, Agent or FirmInternational ClassH04M 009/08AbstractAn 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.Other References
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