Title :
A miniature microphone for transistorized amplifiers
Author_Institution :
Shure Brothers, Inc., Chicago, Illinois
Abstract :
A new magnetic microphone has been developed for use in hearing aids and communication and similar equipment which requires a small, light, medium-impedance microphone. The new microphone has a diameter of 1 inch and a thickness of 3/8 inch, and i t weighs 9 grams. The sensitivity is high enough to override the relatively high noise level of transistors in the frequency range most useful for voice transmission.
Keywords :
Air gaps; Coils; Frequency; Leg; Magnetic circuits; Magnetic flux; Micromagnetics; Microphones; RLC circuits; Transducers;
Journal_Title :
Audio, Transactions of the IRE Professional Group on
DOI :
10.1109/T-SP.1953.28159
