Convergence Analysis of a Stereophonic Echo Canceling Algorithm Using Input Signals of All Channels

  • Kim, Masanori oto (Department of Electrical and Electronics Engineering, Nippon Institute of Technology) ;
  • Toshihiro Furukawa (Department of Management Science, Science University of Tokyo) ;
  • Shinsaku Mori (Department of Electrical and Electronics Engineering, Nippon Institute of Technology)
  • Published : 2002.07.01

Abstract

In the linear combination type stereophonic echo canceller, it is known not to converge the coefficient vector of the adaptive filter to a correct echo path. In this report, we analyze the convergence value of the filter coefficient vector of the stereo echo canceling algorithm using input signals of all channels in relation to this problem. In this analysis, one of the two inputs to the un-known system and adaptive one are assumed to be a delayed and attenuated version of the other signal as a model of the input signal with a strong cross-correlation. As a result, it is shown for the coefficient vectors not to converge to echo paths, and nor to converge to the value which depends on the time delay and the attenuation of the input signal. We show that the computer simulation result are corresponding to our analytical results.

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