Sixth European Conference on Speech Communication and Technology
(EUROSPEECH'99)

Budapest, Hungary
September 5-9, 1999

Noise Subtraction with Parametric Recursive Gain Curves

Klaus Linhard (1), Tim Haulick (2)

(1) DaimlerChrysler Research and Technology, (2) DaimlerChrysler Aerospace, Ulm, Germany

A well known technique for speech enhancementis spectral subtraction. This technique is attractivedue to its simplicity and its low computational cost.We have proposed a simple modification of the filtercoeficient calculation in form of a recursion of theprevious filter coeficient. Because of this recursionthe subtraction rule (gain curve) consists of twodifferent paths, one for increasing signal-to-noise-ratio and another for the decreasing ratio. In thispaper we will introduce a parametric version of thisrecursive approach with two parameters controllingthe crossover behaviour of the two paths. Althoughthis recursive version is a very simple algorithm itis easily adjusted to produce no musical noise andadditionally to get low speech distortion and/or lowresidual noise.


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Bibliographic reference.  Linhard, Klaus / Haulick, Tim (1999): "Noise subtraction with parametric recursive gain curves", In EUROSPEECH'99, 2611-2614.