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A microphone for fully implantable hearing device was generally implanted under the skin of the temporal bone. So, the implantedmicrophone’s characteristics can be affected by the accompanying noise due to masticatory movement. In this paper, the implantablemicrophone with 2-channels structure was designed for reduction of the generated noise signal by masticatory movement. And anexperimental model for generation of the noise by masticatory movement was developed with considering the characteristics of humantemporal bone and skin. Using the model, the speech signal by a speaker and the artificial noise by a vibrator were suppliedsimultaneously into the experimental model, the electrical signals were measured at the proposed microphone. The collected signals wereprocessed using a general adaptive filter with least mean square(LMS) algorithm. To confirm performance of the proposed methods, thecorrelation coefficient and the signal to noise ratio(SNR) before and after the signal processing were calculated. Finally, the results werecompared each other.

The Design of Temporal Bone Type Implantable Microphone for Reduction of the Vibrational Noise due to Masticatory Movement