Abstract: Both a cascade and a multichannel joint Bayesian estimator are provided for suppressing acoustic echo. An expansion basis (Power/Fourier series) is selected to convert a sample-based input signal xt into a DFT-domain multichannel signal [X?,1, . . . X?,p]. The posterior of unknown states (e.g., mean ?? and covariance P? of the echo path W? and the mean â? and covariance Q? of the nonlinear coefficients a?; or channel-wise mean ??,i and multichannel covariance P? of a compound quantity formed by merging together the echo path W? and the ith nonlinear coefficient a?,i) and model parameters ?? are estimated; and Kalman gain factor(s) K? are computed for optimal adaptation of the posterior of unknown states. An echo signal ?? is estimated using the multichannel input signal [X?,1, . . . X?,p] and the adapted posterior; and an error signal E? is generated.

Abstract: Both a cascade and a multichannel joint Bayesian estimator are provided for suppressing acoustic echo. An expansion basis (Power/Fourier series) is selected to convert a sample-based input signal xt into a DFT-domain multichannel signal [X?,1, . . . X?,p]. The posterior of unknown states (e.g., mean ?? and covariance P? of the echo path W? and the mean â? and covariance Q? of the nonlinear coefficients a?; or channel-wise mean ??,i and multichannel covariance P? of a compound quantity formed by merging together the echo path W? and the ith nonlinear coefficient a?,i) and model parameters ?? are estimated; and Kalman gain factor(s) K? are computed for optimal adaptation of the posterior of unknown states. An echo signal ?? is estimated using the multichannel input signal [X?,1, . . . X?,p] and the adapted posterior; and an error signal E? is generated.

Abstract: This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizations of AEC units. The improvement using the simple statistical adaptive-filter controller is accomplished by optimizing a joint control of an echo canceller and a postfilter.

Abstract: This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor ?(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

Abstract: This invention discloses an improvement to a digital Acoustic Echo Control (AEC) in hands-free telephones. It describes an additional adaptive filter referred to as a residual echo filter, which is placed after the usual echo canceller and it is used to efficiently and accurately estimate a residual echo signal b(i) and a system coupling factor ?(i), which can be utilized to establish an efficient control for the AEC system and construct the appropriate filters. The invention also describes a control block means performing a joint operation control of the echo canceller, residual echo suppressor and residual echo filter for achieving more consistent echo cancellation results and enhancing output signal quality.

Abstract: This invention describes a statistical adaptive-filter controller for digital acoustic echo control in hands-free telephones for achieving more consistent echo cancellation results (i.e. higher output signal quality) and simpler realizations of AEC units. The improvement using the simple statistical adaptive-filter controller is accomplished by optimizing a joint control of an echo canceller and a postfilter.