Unidirectional condenser microphone

Details Unidirectional condenser microphone Unidirectional condenser microphone

1973-05-29

1976-06-15

Claffy, Kathleen H.

179121D, H04R 138, H04R 1904

Patent

active

039638812

ABSTRACT:
A miniature unidirectional condenser microphone includes a diaphragm dividing a housing into first and second chambers. Each chamber communicates through a sound inlet port to the atmosphere. One of the sound inlet ports is covered by a sheet of porous, non-absorbent, hydrophobic thermoplastic material forming an acoustical resistance.

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"Applied Acoustics," Olson & Massa, 1939, Sec. Ed., p. 29, P. Blakiston's Son & Co., Inc., Philadelphia, Pa.
"Microphones," A. E. Robertson, 1963, Sec. Ed., pp. 33, 312, 313, New York Hayden Book Co., Inc. 116 W. 14th St. N.Y. 11, N.Y.

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