title: In vivo evaluation of mastication noise reduction for dual channel implantable microphone.
abstract: Input for fully implantable hearing devices (FIHDs) is provided by an implantable microphone under the skin of the temporal bone. However, the implanted microphone can be affected when the FIHDs user chews. In this paper, a dual implantable microphone was designed that can filter out the noise from mastication. For the in vivo experiment, a fabricated microphone was implanted in a rabbit. Pure-tone sounds of 1 kHz through a standard speaker were applied to the rabbit, which was given food simultaneously. To evaluate noise reduction, the measured signals were processed using a MATLAB program based adaptive filter. To verify the proposed method, the correlation coefficients and signal to-noise ratio before and after signal processing were calculated. By comparing the results, signal-to-noise ratio and correlation coefficients are enhanced by 6.07dB and 0.529 respectively.
authors.affiliation: Graduate School of Electrical Engineeing, Kyungpook National University, Sangyuk-dong, Buk-Gu, Daegu, 702-701, S. Korea.
authors.forename: SeongTak
authors.initials: S
authors.lastname: Woo
authors.forename: EuiSung
authors.initials: E
authors.lastname: Jung
authors.forename: HyungGyu
authors.initials: H
authors.lastname: Lim
authors.forename: Jang Woo
authors.initials: JW
authors.lastname: Lee
authors.forename: Ki Woong
authors.initials: KW
authors.lastname: Seong
authors.forename: Chul Ho
authors.initials: CH
authors.lastname: Won
authors.forename: Myoung Nam
authors.initials: MN
authors.lastname: Kim
authors.forename: Jin Ho
authors.initials: JH
authors.lastname: Cho
authors.forename: Jyung Hyun
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000465:Algorithms; D000818:Animals; D001843:Bone Cements; D004867:Equipment Design; D005027:Ethylene Oxide / Q000737:chemistry; D006310:Hearing Aids; D008409:Mastication / Q000502:physiology*; D009622:Noise; D011817:Rabbits; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D059629:Signal-To-Noise Ratio; D012984:Software; D013701:Temporal Bone / Q000473:pathology*; D013997:Time Factors; D014732:Vibration
chemical_list: D001843:Bone Cements; D005027:Ethylene Oxide
keywords: Implantable microphone; Mastication; adaptive filter; fully implantable hearing devices; in vivo experiment