Sixth European Conference on Speech Communication and Technology

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 signaltonoiseratio 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, 26112614.