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Robust and Efficient Implementation of the PEM—AFROW Algorithm for Acousic Feedback Cancellation

The PEM-AFROW algorithm has been developed to model a room impulse response under closed-loop conditions, such as in microphone-amplifier-loudspeaker systems, and is particularly suited for a speech signal input. If a controller is inserted in the loop that uses this model to remove the loudspeaker signal component from the microphone signal, an efficient feedback cancellation can be performed. Crucial implementation-oriented issues that have not been studied so far are addressed. In particular, adaptation control mechanisms are proposed for feedback cancellation based on PEM-AFROW, and efficient subband and frequencydomain implementations are provided for this algorithm.

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JAES Volume 55 Issue 11 pp. 955-966; November 2007
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AES - Audio Engineering Society