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A study for the effect of widened auditory filter of hearing impaired listener

The reduced frequency selectivity is a typical phenomenon of sensorineural hearing loss. In this paper, we made modeling of reduced frequency selectivity for hearing impaired listener. The model of reduced frequency selectivity was generated with bandwidth control algorithm based on ERB(equivalent rectangular bandwidth) of auditory filter. In other to examine the effectiveness of model, we compared PESQ(perceptual evaluation of speech quality) score and LLR(log likelihood ratio) score with 36 Korean worlds of two syllables. To verify the effect on noise condition, we mixed white and babble noise with 0dB and -3dB SNR to speech words. As the result, PESQ score is lower as extending bandwidth of filter however LLR score is almost same. It means that non-linearity and widen auditory filter characteristics caused by reduced frequency selectivity could be reflected in bandwidth control algorithm.