19 January 2006 Acoustic characteristics improvement of PZT ceramic sounder for sound source of artificial larynx
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Abstract
For utterance handicapped persons, various speech production substitutes which aim to reconstruct speech functions have been developed and used practically. But conventional speech production substitutes have various problems, therefore perfect speech production substitutes expect to be developed. We focused to PZT ceramics sounder as a sound source of an electric drive artificial larynx. We first produced the artificial larynx which uses PZT ceramic sounder, and then evaluated its performance. The voice of the power spectrum of the artificial larynx user is similar to that of the speaking person's voice. The vocalized sound of the artificial larynx user shows good characteristics at formant frequency which is important for vowel discrimination. The feature of our artificial larynx is its own structure, and the typical structure means that the sound source and the implant are separated. This structure gives high biocompatibility in our artificial larynx. In this report, the acoustic characteristics improvement of the sound source is described. The characteristics improvement is achieved by optimization of the electric control and its structure. Until now, we have researched about the enzyme immobilization method onto gold or platinum substrate using biomoleculer immobilization technology. By biomoleculer immobilization onto the sound source surface, it is thought that the biocompatibility of it improves. In the future, we aim at the realization of implantable sound source which applied biomoleculer immobilization technology.
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Katsutoshi Ooe, Ryota Kanetake, Akimitsu Tanaka, "Acoustic characteristics improvement of PZT ceramic sounder for sound source of artificial larynx", Proc. SPIE 6036, BioMEMS and Nanotechnology II, 60360R (19 January 2006); doi: 10.1117/12.638739; https://doi.org/10.1117/12.638739
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