Work of PZT ceramics sounder for sound source artificial larynx
2007
We aim to develop the easy-to-use artificial larynx with high tone quality. We focus on using a PZT
ceramics sounder as its sound source, because it is small size, low power consumption, and
harmless to humans. But conventional PZT ceramics sounder have the problem that it cannot
generate an enough sound in the low frequency range, thus they cannot be used for artificial larynx.
Then, we aim to develop the PZT ceramics sounder which can generate enough volume in the low
frequency range. If we can lower the resonance frequency of the sounder, it can generate low pitch
sound easily. Therefore I created the new diaphragm with low resonance frequency. In addition, we
could obtain the high amplitude by changing method of driving. This time, we report on the
characteristic comparison of this new PZT ceramics sounder and conventional one. Furthermore,
for this new one, we analyzed the best alignment of PZT ceramics and the shape of the diaphragm
to obtain low resonance frequency and big amplitude. In fact we analyzed the optimization of the
structure. The analysis is done by computer simulation of ANSYS and Laser Doppler Vibrometer.
In the future, we will add intonation to the generated sound by input wave form which is developed
concurrently, and implant the sounder inside of the body by the method of fixing metal to
biomolecule which is done too. And so high tone quality and convenient artificial larynx will be
completed.
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