Patent ID: 6125179
Filing Date: 2000-09-26
Classification: H04M

Abstract:
An acoustic echo control device that suppresses echoes, comprising:a first talking mode detector for providing a first signal indicative of one of three talking modes;an adaptive filter responsive to said first signal, said adaptive filter generating a replica of the echo component of a near-end signal;a summer device that subtracts the replica of the echo component of the near-end signal from the near-end signal for producing a modified near-end signal;a second talking-mode detector for providing a second signal indicative of one of three talking modes; anda nonlinear attenuator wherein said nonlinear attenuator provides one of no attenuation, attenuation that adjusts to achieve a desired echo return loss, and a fixed amount of attenuation, of the modified near-end signal in response to said second talking-mode detector.