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Study on frequency response of implantable microphone and vibrating transducer for the gain compensation of implantable middle ear hearing aid

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Fig. 1. Concept of ACROSS device placed under the temporal bone skin with DFMT attached on ossicular chain and an implantable microphone.
Fig. 2. Design and picture of the implantable microphone.  Fig. 3. An electro-magnetic differential floating mass transducer(DFMT) for ACROSS device.
Fig. 6. Block diagram for the displacement measurement of auditory ossicles using an DFMT.
Fig. 8. DFMT output on the free field(a bold broken line) and output graphs of cadavers' stapes operated by the pure tone sound of 94 dB SPL(black-dot broken line), by DFMTs(inverted triangle-dot broken line), by the ACROS(rectangular-dot broken line)
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