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Noise-cancelling microphone using a piezoelectric plastics transducing element

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2 Author(s)
Sear, J.F. ; Plessey Company Limited, Allen Clark Research Centre, Towcester, UK ; Carpenter, R.

A noise-cancelling communication microphone using a piezoelectric plastic as the transducer element has been developed. The bimorph structure adopted in conjunction with an impedance matching preamplifier circuit and suitable acoustic design provides an adequate, stable output at low impedance, with an acceptable frequency response. The susceptibility of the microphone to electromagnetic fields is low.

Published in:

Electronics Letters  (Volume:11 ,  Issue: 22 )