Piezoelectric Microphones

The development of the Rochelle salt crystal microphone, with particular reference to the grille and sound-cell type, is described; and the construction of the sound-cells and the method employed for rendering them air-tight and water-proof are explained. Due to the small size of the microphones they are relatively free from distortion arising from cavity resonance, diffraction, and phase-shift, and are non-directional. — Comparative response curves ranging in frequency from 50 to 10,000 cycles per second are presented. Special types of piezoelectric microphones for sound picture recording, radio broadcasting, and theater sound-reënforcing systems are described. Some of their physical, electrical, and acoustical characteristics are discussed, including those of a new unidirectional instrument.

Print ISSN

0097-5834

Published

1934-10

Content type

Original Research

DOI

10.5594/J05439