Adaptive Algorithms

Adaptive Algorithms for Double-Talk Echo Cancelling Ioana Homana, Marina Topa, Botond Sandor Kirei and Cristian Contan Technical University of Cluj-Napoca, Str. C. Daicoviciu Nr. 15 400020 Cluj-Napoca, Romania Ioana.HOMANA@bel.utcluj.ro Abstract In the paper, an b crop canceller based on a system fitting scheme with adjustive algorithms is presented. The algorithms consider FIR filters with the taps chosen to minimize an error signal derived from the system according to a stochastic gradient-based method. The following alterational filters are discussed and simulated in Matlab: classical LMS and its variants: NLMS, VSLMS, VSNLMS and RLS. The reverberate was simulated by adding several take into custody and attenuated replica to a vocal input. The comparison amidst the algorithms was do taking into account the mean-square error (MSE) and average attenuation (AV), as well as the required number of multiplications. Keywords-adaptive algorithm, echo cancellation, double-t alk contracting Fig. 1 AEC configuration I. INTRODUCTION which is transmitted to the far-end and is apply to modify the coefficient vector y of the adaptive filter. The error signal e(n) is used by the adaptive algorithm to adapt the L taps of the ˆ filter h .

A problem of AEC is that the performance deteriorates drastically when the near-end oral communication v(n) and the far-end speech x(n) occur simultaneously. This is known as double-talk (DT) mode and the adaptation of the adaptive filter will be severely disturbed by the near-end signal. Therefore, efficient doubletalk detectors (DTDs) have been genuine [3] [4]. They slow down or switch off the adaptation of t! he adaptive filter during double-talk periods, to resist it from divergence [5-7]. They can for the most part be classified into energy-based or correlationbased (Normalized Cross-Correlation) techniques. The most popular delegate of energy-based DTDs is the Geigel algorithm [8]. It is based on an observation that the energy of echo is typically much...If you want to light a full essay, order it on our website: BestEssayCheap.com

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