A new kind of condenser microphone which utilizes a foil electret and therefore requires no external dc bias is described in this paper. The frequency response of the microphone is within ±3 db from 50 to 15000 cps. Sensitivities as high as -50 dbv re 1 µbar have been achieved. Due to its relatively low impedance, the microphone can be connected directly to conventional transistors amplifiers. Measurements over a period of about one year have shown no degradation of microphone sensitivities and indicate excellent stability of these systems.

Authors: Sessler, Gerhard M.; West, James E.
Affiliation: Bell Telephone Laboratories, Inc., Murray Hill, NJ
JAES Volume 12 Issue 2 pp. 129-131; April 1964
Publication Date: April 1, 1964 Import into BibTeX
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=751

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