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2017 Vol.36, Issue 2 Preview Page
Directional realization of in the ear hearing aid using digital filters

디지털 필터를 사용한 귓속형 보청기의 지향성 실현

Soon-Suck Jarng1*
,
You-Jung Kwon2
장 순석1*
,
권 유정2
1조선대학교 전자공학과
2알고코리아 기업부설연구소
*교신저자. *Corresponding Author. 
31 March 2017. pp. 123-129
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Abstract

In this paper, the realization of a directional digital hearing aid was considered. Conventional time domain time delay method was replaced with digital filters in order to make any general-purposed DSP (Digital Signal Processing) chip to produce the similar directivity pattern. Both the time delay algorithm and the digital filter algorithm were initially evaluated by Matlab (Matrix laboratory) for comparison, and it was confirmed by CSR 8675 Bluetooth DSP IC (Digital Signal Processing Integrated Circuit) chip firmware realization. Some remote control features by a smart phone was added to the smart hearing aid for user interface easiness.

Keywords
Smart hearing aid
Directionality
Digital filtering in frequency domain
Time delay method
Smart phone remote control

본 논문은 보청기의 지향성 알고리즘을 실시간으로 실현한 내용을 다루었다. 기존의 시간 영역에서의 시간 지연 기법에 의한 지향성 실현을 디지털 필터 방식으로 처리함으로써 시간 지연 적용이 불가능한 일반 DSP(Digital Signal Processing) 칩으로도 유사한 지향성 패턴을 가능하게 하였다. 시간 지연 기법과 디지털 필터 기법을 각각 Matlab(Matrix laboratory) 기반으로 비교 검증한 후에, 이를 CSR 8675 블루투스 DSP IC(Digital Signal Processing Integrated Circuit) 칩 펌웨어로 실현하고 검증해보였다. 스마트폰으로의 원격 무선 제어 기능으로 스마트 자향성 보청기의 사용자 접근 편의성을 강화시켰다.

키워드
스마트 보청기
지향성
주파수 영역 디지털 필터 기법
시간 지연 기법
스마트폰 원격 제어
References
1
Y. J. Kwon and S. S. Jarng, “Directivity pattern simulation of the ear with hearing aid microphones by BEM” (in Korean), J. Acoust. Soc. Kr. Suppl.1(s) 23, 361-366 (2004).
2
S. S. Jarng and J. H. Ko, “Automatic control of experimental apparatus for sound’s directivity measur-ement direction acoustic wave” (in Korean), J. Acoust. Soc. Kr. Suppl.2(s) 23, 231-234 (2004).
3
Y. J. Kwon, J. H. Lee, and S. S. Jarng, “Directivity modeling of the ears with hearing aids by BEM” (in Korean), J. Acoust. Soc. Kr. Suppl.2(s) 23, 175-178 (2004).
4
EZAIRO 7110 HYBRID, http://onsemi.com, Semicondu-ctor Components Industries, LLC, Publication Order Number: E7110/D, 2013.
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S. S. Jarng, “Acoustic wireless communication from smartphone to hearing aid” (in Korean), J. Acoust. Soc. Kr. 34, 91-97 (2015).
6
BlueCore® CSR8675 BGA, Qualcomm Technologies International, Ltd., CS-333028-PS, http://www.csr.com/sites/default/files/csr8675_bga.pdf, 2015.
7
J. A. Nelder and R. Mead, “A simplex method for function minimization,” Computer Journal 7, 308-313, (1965).
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W. H. Press, B. P. Flannery, S. A. Teukolsky, and W. T. Vettering, Numerical Recipes in C (Cambridge University Press, Cambridge, 1988), pp. 432-436.
9
Find minimum of unconstrained multivariable function using derivative-free method, https://kr.mathworks.com/help/matlab/ref/fminsearch.html, 2017.
10
S. S. Jarng, Y. J. Kwon, and J. H. Lee, “Binaural directivity pattern simulation of the KEMAR head model with two twin hearing aid microphones by boundary element method,” J. Acoust. Soc. Kr. 24, 115-122 (2005).
11
S. S. Jarng, Y. J. Kwon, and J. H. Lee, “Binaural directivity pattern measurements of the KEMAR head model with two twin hearing aid microphones,” J. Acoust. Soc. Kr, 25, 25-31 (2006).
Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 36
  • No :2
  • Pages :123-129
  • Received Date : 2017-02-17
  • Accepted Date : 2017-03-29
  • DOI :https://doi.org/10.7776/ASK.2017.36.2.123
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