Call For Paper Volume:4 Issue:8 Aug'2017 |

A Novel Design for Restoration of Suppression with Noise Reduction Capability in Hearing Impaired Listeners

Publication Date : 30/06/2015



Author(s) :

Aswathy Chandran , Anju S Mohan.


Volume/Issue :
Volume 2
,
Issue 6
(06 - 2015)



Abstract :

The cochlea is the primary sensory organ for hearing. Its three major signal-processing functions are frequency analysis, dynamic-range compression (DRC) and amplification. The cochlea implements these functions in a concurrent manner that does not allow completely separate characterization of each function. Common forms of hearing loss are manifestations of mutual impairment of these major signal-processing functions. Gamma tone filters are widely used in computational auditory models for modelling the peripheral filtering in the cochlea. Filters of this type are then combined to form a computational auditory filter bank. The filter bank was used as the peripheral filtering stage of the computational auditory model. Suppression of the filtered output plays an important role in the coding of speech and other complex stimuli and it has been suggested to result in the enhancement of spectral contrast of complex sounds, such as vowels. The individual outputs of the suppression stage are then combined to obtain an output signal with suppressive effects. The restoration of both normal suppression and normal loudness has the potential to improve hearing-aid performance and user satisfaction. Also single channel speech enhancement at the output of the auditory motivated Gamma tone filter bank is performed for benefits in terms of listener preference and Speech Intelligibility that improves speech perception in presence of background noise.


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A Novel Design for Restoration of Suppression with Noise Reduction Capability in Hearing Impaired Listeners

June 30, 2015