ISCA Archive Interspeech 2005
ISCA Archive Interspeech 2005

Implicit control of noise canceller for speech enhancement

Julien Bourgeois, Jürgen Freudenberger, Guillaume Lathoud

Widrow's interference canceller, adapted by the normalized LMS (NLMS), is a standard approach for separating signals from multiple speakers, for example from the driver (target) and the codriver (interferer) in a car. In practice, the adaptation must be carried out only when the interferer is dominant, i.e. only when some estimate of the signal-to-interference ratio (SIR) is below a certain threshold. In this paper, we present the Implicitly controlled LMS (ILMS), a modification of the NLMS. ILMS adaptation is performed continuously using a variable step-size, whose design implicitly detects dominance of the interferer over target activity. Specific measures are taken to guarantee the stability during adaptation. Theoretical analysis of the ILMS transient convergence and stability conditions prove significant improvement with respect to the original NLMS. Experimental results on real in-car data assess the predicted behavior.

doi: 10.21437/Interspeech.2005-676

Cite as: Bourgeois, J., Freudenberger, J., Lathoud, G. (2005) Implicit control of noise canceller for speech enhancement. Proc. Interspeech 2005, 2065-2068, doi: 10.21437/Interspeech.2005-676

  author={Julien Bourgeois and Jürgen Freudenberger and Guillaume Lathoud},
  title={{Implicit control of noise canceller for speech enhancement}},
  booktitle={Proc. Interspeech 2005},