Patents Assigned to ClearOnce Communications, Inc.
  • Conferencing system implementing echo cancellation and push-to-talk microphone detection using two-stage frequency filter
    Patent number: 8199927
    Abstract: Disclosed herein are conferencing products implementing an acoustic echo cancellation system that utilizes converging coefficients and a detector of turn-off and/or turn-on events of push-to-talk microphones, and, further, that mitigates against divergence and/or drift of coefficients and other variables of an echo canceller. A push-to-talk detector may be used that includes a high-pass filter, a transient detector, or an adjustable high-pass filter. An echo canceller may be disabled as to a push-to-talk microphone that has been turned off.
    Type: Grant
    Filed: October 31, 2007
    Date of Patent: June 12, 2012
    Assignee: ClearOnce Communications, Inc.
    Inventor: Emmet Raftery