Research Article Open Access

Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired

Joseph X. Rodrigues1, Lucy J. Gudino1 and K. R. Pai1
  • 1 ,
American Journal of Engineering and Applied Sciences
Volume 5 No. 1, 2012, 42-48

DOI: https://doi.org/10.3844/ajeassp.2012.42.48

Submitted On: 19 September 2011 Published On: 27 February 2012

How to Cite: Rodrigues, J. X., Gudino, L. J. & Pai, K. R. (2012). Sharp Transition Multiband Filter in Speech Processing Scheme for Hearing Impaired. American Journal of Engineering and Applied Sciences, 5(1), 42-48. https://doi.org/10.3844/ajeassp.2012.42.48

Abstract

Problem statement: A simple analytical approach to the synthesis of a sharp transition, linear phase, multiband FIR filter is presented. The filter magnitude response is modeled using trigonometric functions of frequency. Approach: Employing variable density of ripple cycles in passband and stopband regions with large density of ripples cycles at the sharp transition edges, reduces the abrupt discontinuities at these edges. Results: As a result, Gibb’s phenomenon is reduced in the filter implementation thus giving a flat passband and good stopband attenuation. A closed form expression for impulse response coefficients is obtained. The filter design is easily tunable and allows for variation in transition bandwidth of each band. A speech processing scheme is implemented using a pair of the proposed sharp transition multiband FIR filters to split the speech spectrum into complementary short time spectral bands. Conclusion: The adjacent speech formants are fed dichotically to the two ears to reduce the effect of spectral masking and hence improve speech perception in sensorineural hearing impaired.

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Keywords

  • Sharp transition
  • FIR filter
  • multiband filter
  • gibb’s phenomenon
  • sensorineural hearing impaired
  • speech processing scheme