The invention relates to a method for reducing a
noise by using the hearing threshold of impaired hearing. The method comprises the following steps of: dividing an input speech
signal into N subband signals, compensating the hearing, respectively reducing the
noise of the subband signals, and comprehensively
processing various paths of input subband signals into a path of output signals by a weighted stacking
filter bank. The invention provides a generalized
spectral subtraction method according to
noise levels and hearing threshold adjustment parameters, wherein a posteriori
signal-to-noise ratio is replaced by an a priori
signal-to-noise ratio to adjust a
gain function, so that musical noise generated by
noise reduction can be effectively reduced. The
noise reduction gain function is related to the signal-to-noise ratio, and is adjusted according to the noise levels and the hearing threshold of a patient; when the hearing threshold is high, the suppression to the noise is low, and
speech distortion is reduced simultaneously; and when the hearing threshold is low, the suppression to the noise is increased so as to improve listening comfort, so that the method has pertinence to different
hearing loss conditions and different noise conditions, and makes the suppression effect and the
speech distortion relatively balanced.