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Performance Evaluation of STHT based Phase Vocoder for Hearing Impaired


Affiliations
1 Department of Electronics and Telecommunication Engineering, Pimpri Chinchwad College of Engineering, Pune - 411044, Maharastra, India
 

Objectives: The performance of hearing aid largely depends on its ability to enhance the quality of speech. The objective of this paper is to find out the changes in time pattern of the speech signals which would help to resolve the issue of the temporal resolution. Methods/Statistical Analysis: Various Fourier transformation techniques are available for speech enhancement in hearing aid. This paper proposes Short Time Hartley transform (STHT) signal processing technique based phase vocoder for hearing impairment. Pitch shifting though time scaling is obtained by using phase vocoder. The proposed algorithm is implemented in MATLAB and verified with Vowel Consonant Vowel (VCV) data sets. Findings: In this paper, formants which are concentration of acoustic energy around a particular frequency are calculated for both STFT and STHT techniques and compared for performance evaluation using VCV data sets. The variation in pitch and power for different time scaling factors is observed which reflects the changes in time pattern of speech signals. The results obtained supports Short-Time Fourier transforms (STHT) signal processing technique to be effective for Phase vocoder performing time scaling and pitch shifting of audio as well as speech signals and can be a remedy for temporal resolution issue. Application/Improvements: As pitch shifting is observed towards both lower and higher frequency ranges, STHT can be a suitable processing technique, beneficial for hearing impaired people with sensorineural hearing loss.
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  • Deafness and hearing loss. Available from: http://www.who.int/newsroom/factsheets/detail/deafness-and-hearingloss. Date accessed: 15/03/2018.

  • Neelam Joshi, Kolte MT. Digital Hearing Aid - A Review. International Journal of Innovative Research in Electrical, Electronics, Instrumentation and Control Engineering. 2013; 1(8):369-72.

  • Nagraj A. Samadhanatmak Bhotikvad, 3rd edn. Jeevan Vidta Prakashan, Amarkantak, Madhya Pradesh, India, 2009.

  • Kolte MT, Chaudhari DS. Evaluation of Speech Processing Schemes for Improving Perception of Sensorineural Hearing Impaired. Current Science. 2010; 98(5):613-15.

  • Kolte MT. Experimental Evaluation Using Signal Processing Techniques for Aids Used by Hearing Impaired. Doctoral dissertation, Sant Gadge baba Amravati University, India. 2008.

  • Bousselmi S, Aloui N, Cherif A. DSP Real-Time implementation of an Audio compression algorithm by using the Fast Hartley transforms. International Journal of Advanced Computer Science and Applications. 2017; 8(4):472-7.

  • Liu JC, Lin TP. Short-time Hartley transform. Proceedings of IEE Radar and Signal Processing. 1993; p. 171-4. https:// doi.org/10.1049/ip-f-2.1993.0024

  • Sundararajan N, Ebrahimi A, Va-sudha N. Two Dimensional Short Time Hartley Transform. SQU Journal for Science. 2016; 21(1):41-7. https://doi.org/10.24200/squjs.vol21iss1 pp41-47

  • Laroche J, Dolson M. Improved phase vocoder time-scale modification of audio. IEEE Transaction Speech and Audio Processing. 1999; 3:323-32. https://doi.org/10.1109/89.759041

  • Dolson M. The phase vocoder: A tutorial. Computer Music Journal. 1986; 10(4):14-27. https://doi.org/10.2307/3680093

  • Vaishali R. Chopade, Dr. Mahesh T. Kolte. STHT based Speech Signal Processing using phase vocoder, 2018, August, ICCUBEA 18.


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  • Performance Evaluation of STHT based Phase Vocoder for Hearing Impaired

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Authors

Vaishali R. Chopade
Department of Electronics and Telecommunication Engineering, Pimpri Chinchwad College of Engineering, Pune - 411044, Maharastra, India
Mahesh T. Kolte
Department of Electronics and Telecommunication Engineering, Pimpri Chinchwad College of Engineering, Pune - 411044, Maharastra, India
Anjali A. Shrivastav
Department of Electronics and Telecommunication Engineering, Pimpri Chinchwad College of Engineering, Pune - 411044, Maharastra, India

Abstract


Objectives: The performance of hearing aid largely depends on its ability to enhance the quality of speech. The objective of this paper is to find out the changes in time pattern of the speech signals which would help to resolve the issue of the temporal resolution. Methods/Statistical Analysis: Various Fourier transformation techniques are available for speech enhancement in hearing aid. This paper proposes Short Time Hartley transform (STHT) signal processing technique based phase vocoder for hearing impairment. Pitch shifting though time scaling is obtained by using phase vocoder. The proposed algorithm is implemented in MATLAB and verified with Vowel Consonant Vowel (VCV) data sets. Findings: In this paper, formants which are concentration of acoustic energy around a particular frequency are calculated for both STFT and STHT techniques and compared for performance evaluation using VCV data sets. The variation in pitch and power for different time scaling factors is observed which reflects the changes in time pattern of speech signals. The results obtained supports Short-Time Fourier transforms (STHT) signal processing technique to be effective for Phase vocoder performing time scaling and pitch shifting of audio as well as speech signals and can be a remedy for temporal resolution issue. Application/Improvements: As pitch shifting is observed towards both lower and higher frequency ranges, STHT can be a suitable processing technique, beneficial for hearing impaired people with sensorineural hearing loss.

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DOI: https://doi.org/10.17485/ijst%2F2018%2Fv11i41%2F130734