Digital hearing-aid unequal-width sub-band automatic gain control method

2011 
The invention provides a digital hearing-aid unequal-width sub-band automatic gain control method. The method includes: designing an unequal-width analysis filter bank according to human ear auditory characteristics, conducting segment processing to input acoustical signals, filtering each segment acoustical signal by using the analysis filter bank to obtain signals of various sub-bands, counting input signal sound pressure level inside the various sub-bands, conducting sub-band automatic gain adjustment according to the sub-band signal sound pressure level, finally using a synthesizing filter bank to synthesize adjusted sub-band signals to obtain system output signals. According to the digital hearing-aid unequal-width sub-band automatic gain control method, noise and voice signals are isolated out through the sub-band filter bank, and thus the gains of noise frequency ranges and the voice signals are respectively controlled, and the roles of noise suppression and signal-to-noise ratio improvement are played. Compared with a traditional equal-width sub-band filter bank partition method, an unequal-width filter bank sub-band partition method used by the digital hearing-aid unequal-width sub-band automatic gain control method coincides with the human ear auditory characteristics. On the premise of obtaining the same effect, the amount of sub-bands need parting and the calculated amount are reduced. In addition, the digital hearing-aid unequal-width sub-band automatic gain control method is achieved totally by a software program with no need of adding an additional hardware circuit, thereby saving the cost, weight and size of a product.
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