Article details

Research area
Speech enhancement

ITG 2016


Ingo Schalck-Schupp, Friedrich Faubel, Markus Buck, Andreas Wendemuth

Combined Linear and Nonlinear Residual Echo Suppression Using a Deficient Distortion Model — A Proof of Concept


Acoustic echo control is still challenged with finding computationally efficient and accurate methods for handling nonlinear echo components introduced by cheap loudspeaker components and high signal levels. We propose a robust echo control scheme that utilizes a common linear acoustic echo canceler as well as a combined linear and nonlinear residual echo suppression unit. Linear and nonlinear residual echo powers are estimated separately making use of the same room impulse response estimate provided by the linear canceler. Frequency-dependent coupling factors between the observed and the respective estimated residual echo power are used to account for deviations due to varying convergence states of the linear filter or the nonlinear model. A weighted sum of the two power estimates is used in a sub-band-domain suppression filter. This contribution compares the potential of the proposed concept to a Hammerstein-type nonlinear acoustic echo canceler under fair simulation conditions.

Read/download now