5th International Conference on Spoken Language Processing

Sydney, Australia
November 30 - December 4, 1998

Spectral Noise Subtraction With Recursive Gain Curves

Klaus Linhard, Tim Haulick

Daimler Benz Research and Technology, Germany

Spectral noise subtraction has the drawback of generating residual noise with musical character, the so-called musical noise. We propose a simple modification of the filter coefficients calculation in form of a recursion to the previous coefficient. This recursion results in a switching mechanism of the spectral subtraction gain, in the way that speech pauses are processed with a nearly constant very low gain and speech components are processed with a nearly constant high gain. Because of the switching mechanism the generation of musical noise is almost completely avoided. The well known approach of Ephraim and Malah has a similar mechanism, but the new recursive scheme is much easier for implementation yet yielding comparable or sometimes better performance than the other approach.

Full Paper

Bibliographic reference.  Linhard, Klaus / Haulick, Tim (1998): "Spectral noise subtraction with recursive gain curves", In ICSLP-1998, paper 0109.