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Keywords:

  • blind source separation (BSS);
  • least mean squares (LMS);
  • speech enhancement

SUMMARY

A new structured approach to adaptive noise cancelling of non-stationary stochastic signals is given. The divide and conquer method subdivides the problem into a number of sources with a power of 2 and subdivides the solution to smaller problems in a similar fashion to that of an FFT. Hence, with the number of sources 2p, where p is a positive integer, the problem is successively reduced to simpler solutions at each stage of order 2p − 1. In its basic form, the method uses only multivariable least mean squares (MLMS), ordinary LMS, and second-order statistics. Copyright © 2012 John Wiley & Sons, Ltd.