Patent ID: 7054437

Claim:
An echo cancellation system ( 11 ), comprising: a microphone ( 18 ), responsive to an echo signal ( 22 ) from a loudspeaker ( 16 ) that provides an acoustic output signal in response to a voice signal ( 20 ), for providing an echo signal which is a component of a microphone signal ( 28 ); and a statistical adaptive-filter controller ( 40 ), responsive to the voice signal ( 20 ) and to an echo reduced microphone signal ( 34 ), for providing a first control signal ( 42 ) to an echo canceller module ( 21 ) and a second control signal ( 44 ) to a postfilter ( 14 ), wherein said first and second control signals are determined jointly by said statistical adaptive-filter controller and provided for optimizing cancellation of the echo signal in a frequency domain and the first control signal ( 42 ) is determined according to: μ ⁡ ( k ) =  G ′  2 ⁢ Φ XX ⁡ ( k ) Φ ee ⁡ ( k ) , wherein |G′| 2 is a predetermined constant and Φ xx (k) and Φ ee (k) denote power spectral density signals of the voice signal ( 20 ) and of the echo reduced microphone signal ( 34 ), respectively, and k is a frame time index.