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Modern hands-free telecommunication devices jointly apply several subsystems, e.g., for Noise Reduction (NR), Acoustic Echo Cancellation (AEC) and Listening-Room Compensation (LRC). In this contribution the combination of an equalizer for listening room compensation and an acoustic echo canceller is analyzed. Inverse filtering of Room Impulse Responses (RIRs) is a challenging task since they are, in general, mixed phase systems having hundreds of zeros inside and outside near the unit circle in the z-domain. Furthermore, a reliable estimate of the RIR which shall be inverted is important. Since RIRs are time-variant due to possible changes of the acoustic environment, they have to be identified adaptively.
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