Author:

Keywords:

DSP, system identification, acoustic echo cancelation, acoustic reflections, adaptive filters, ADSP, linear prediction, signal enhancement, bilinear systems, discrete time systems, dynamical systems, frequency domain identification, prediction error, short and long term prediction, time domain identification, SISTA, Science & Technology, Technology, Acoustics, Engineering, Multidisciplinary, Engineering, HEARING-AIDS, ADAPTATION, STADIUS-05-258, 0906 Electrical and Electronic Engineering, 0915 Interdisciplinary Engineering, 1005 Communications Technologies, 4006 Communications engineering, 4008 Electrical engineering

Abstract:

The PEM-AFROW algorithm has been developed to model a room impulse response under closed-loop conditions, such as in micmphone-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 FKM-AFROW, and efficient subband and frequency-domain implementations are provided for this algorithm.