聽骨鏈振動(dòng)聲學(xué)信號(hào)拾取與補(bǔ)償實(shí)驗(yàn)研究
[Abstract]:Objective: To investigate the feasibility of the auditory ossicular chain vibration pickup and compensation strategy by coupling a self-made piezoelectric microphone with the auditory ossicular chain in cat ears and fresh temporal bone specimens.
MATERIALS AND METHODS: (1) Vibration model of PT300-10 piezoelectric bimorph single cantilever beam was established by finite element ANSYS software to analyze the resonant frequency of piezoelectric bimorph. In vitro simulation experiment, 13 ears (8 cats) were implanted with piezoelectric microphone and fixed in malleus, incus and tympanic cavity respectively. The pure tone, sweep frequency and speech frequency signals were picked up. The same signal was picked up by Hy-M30 high fidelity microphone beside the cat's ear as control group. Seven ears (four pairs of temporal bones) were tested and the same control group was set up. _Piezoelectric microphone picked up acoustic signals from the malleus of the cat ear to compensate and adjust its distortion and loss.
RESULTS: The FEM simulation model showed that the resonant frequency of the piezoelectric bimorph with 3.0xl.0x0.3mm specifications was about 20 kHz under the condition of free vibration of the single cantilever structure, which could satisfy the requirements of both sensitivity and flat frequency response curve when picking up the audible acoustic signals in the full frequency band. The self-made piezoelectric microphone with a volume of 5.0x1.5x1.2mm can sensitively pick up acoustic signals in the whole frequency band. It has a high signal-to-noise ratio and a flat frequency response curve, so it is used for implantation experiment. 3. The results of cat ear implantation experiment indicate that the piezoelectric microphone can pick up external acoustic signals after coupling to the hammer handle, and can drive the whole implant. Cochlear demo electrode array system works, but there is obvious background noise signal, and the frequency signal loss below 1000Hz is serious. The speech frequency signal picking effect is good, cat's ear incus picking up signal is very weak. 4 Fresh temporal bone specimen implantation experiment found that the piezoelectric microphone coupled with malleus picking up signal is good, right The weak signal can also be picked up in the low frequency signal, which is better than that in the cat's ear and malleus. The cat ear ossicular chain (17mg) is much less than the human ear malleus (28.4mg), and the self-made piezoelectric microphone (38mg) is twice as heavy as the cat ear malleus, about half as heavy as the human ear malleus. The overload causes the tympanic ossicular chain to significantly weaken the amplitude of the low-frequency signal for testing the sound source, resulting in the pickup signal of the low-frequency signal is obvious. Loss. _To the cat ear malleolus pickup signal 145-9288Hz band-pass filtering, and then using WDRC dynamic gain amplification signal processing, can compensate for most of the pickup signal loss, to a certain extent, the output amplitude difference adjustment.
CONCLUSION: The feasibility of picking up acoustic signals and compensating strategies of ossicular chain vibration by piezoelectric microphone is preliminarily demonstrated through systematic experiments. The experimental data are far from the practical requirements because of the factors such as physical size, large mass and handmade. Through continuous and in-depth experimental research, we can improve and micropiezoelectric microphone, develop coupling firmware, perfect signal compensation and adjustment processing software and so on, so as to provide a good solution for cochlear implant sound pickup strategy.
【學(xué)位授予單位】:復(fù)旦大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2010
【分類號(hào)】:R764
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