System identification for listening-room compensation by means of acoustic echo cancellation and acoustic echo suppression filters

Subsystems for dereverberation and acoustic echo cancellation (AEC)/acoustic echo suppression (AES) are important components in high-quality hands-free telecommunication systems. This contribution describes and analyzes a combined system for dereverberation and AEC/AES. The system identification inherently achieved by the AEC/AES system is used for the design of the room impulse response (RIR) equalization filter, i.e. the listening-room compensation (LRC) system. We use complex RIR smoothing and decoupled filtered-X least-mean-squares (dFxLMS) gradient algorithm for LRC and a combined AEC/AES system for the system identification necessary for the LRC filter design. The performance of the combined system and the mutual influences of LRC and AEC/AES are analyzed.