In vivo evaluation of mastication noise reduction for dual channel implantable microphone

Woo, SeongTak; Jung, Eui-Sung; Lim, Hyung‐Gyu; Lee, Jang Woo; Seong, Ki Woong; Won, Chul Ho; Kim, Myoung Nam; Cho, Jin Ho; Lee, Jyung Hyun

doi:10.3233/bme-130828

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…Plus, the sound degradation due to frequency and phase distortions is also severe. As a result, these deteriorated conditions significantly reduce the sound perception ability of an implanted microphone [10]. Therefore, various additional speech quality evaluation parameters with practical indicators based on human auditory characteristics need to be included in the design of implantable microphones.…”

Section: Introductionmentioning

confidence: 99%

Speech quality evaluation of subcutaneously implanted microphone using in vivo experiment

Woo

Lee

Jung

et al. 2014

Bio-Medical Materials and Engineering

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The microphone in a fully implantable hearing device (FIHD) is generally implanted under the skin covering the temporal bone. However, the implanted microphone can be affected by the skin, which causes both sound attenuation and distortion, particularly at high frequencies.As the degree of attenuation and distortion through the skin is severe, speech quality evaluation parameters are needed for the received signal when designing an implantable microphone. However, the performance of most implantable microphones is only assessed based on the sensitivity and frequency response. Thus, practical indicators based on human auditory characteristics are needed for an objective evaluation of the performance of implantable microphones. In this study, a subcutaneously implantable microphone was designed, and its frequency response investigated using an in vivo experiment. Plus, to evaluate the objective indicators, the speech quality of the signals measured by the implanted microphone was calculated using a MATLAB program, and the indicators compared before and after implantation.

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Section: Introductionmentioning

confidence: 99%

Speech quality evaluation of subcutaneously implanted microphone using in vivo experiment

Woo

Lee

Jung

et al. 2014

Bio-Medical Materials and Engineering

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Implementation of adjustive latency compensation in a binaural hearing aid to prevent latency due to wireless transmission for using with multi-media devices

Wei

Seong

Lee

et al. 2015

IJSNET

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Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

Lee

Wei

et al. 2017

THC

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Abstract. BACKGROUND: Fully implantable hearing devices (FIHDs) can be affected by generated biomechanical noise such as mastication noise. OBJECTIVE: To reduce the mastication noise using a piezo-electric sensor, the mastication noise is measured with the piezoelectric sensor, and noise reduction is practiced by the energy difference. METHODS: For the experiment on mastication noise, a skull model was designed using artificial skull model and a piezoelectric sensor that can measure the vibration signals better than other sensors. A 1 kHz pure-tone sound through a standard speaker was applied to the model while the lower jawbone of the model was moved in a masticatory fashion. RESULTS: The correlation coefficients and signal-to-noise ratio (SNR) before and after application of the proposed method were compared. It was found that the signal-to-noise ratio and correlation coefficients increased by 4.48 dB and 0.45, respectively. CONCLUSION: The mastication noise is measured by piezo-electric sensor as the mastication noise that occurred during vibration. In addition, the noise was reduced by using the proposed method in conjunction with MATLAB. In order to confirm the performance of the proposed method, the correlation coefficients and signal-to-noise ratio before and after signal processing were calculated. In the future, an implantable microphone for real-time processing will be developed.

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In vivo evaluation of mastication noise reduction for dual channel implantable microphone

Cited by 3 publications

References 8 publications

Speech quality evaluation of subcutaneously implanted microphone using in vivo experiment

Speech quality evaluation of subcutaneously implanted microphone using in vivo experiment

Implementation of adjustive latency compensation in a binaural hearing aid to prevent latency due to wireless transmission for using with multi-media devices

Mastication noise reduction method for fully implantable hearing aid using piezo-electric sensor

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