Post assembly process for adjusting the gain of an electret micr

Details Post assembly process for adjusting the gain of an electret micr Post assembly process for adjusting the gain of an electret micr

1992-12-04

1995-12-05

Hofsass, Jeffery A.

Telephonic communications

Substation or terminal circuitry

Conversion of signal form

379 1, 379419, 379444, 381191, 381113, H04M 124

Patent

active

054736838

ABSTRACT:
A post assembly process for enabling a manufacturer of acoustical communications apparatus, such as telephones and the like, to conveniently trim a sensitivity characteristic of an electret microphone therein, after assembly of the apparatus, whereby a uniform performance standard may be adhered to. When the acoustical sensitivity characteristic of the electret transducer is measured to be greater than a predetermined value, the transducer is exposed to X-ray radiation until the measured sensitivity characteristic has been reduced to the predetermined value.

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patent: 4429191 (1984-01-01), Busch-Vishniac et al.
patent: 4434327 (1984-02-01), Busch-Vishniac et al.
patent: 4853536 (1989-08-01), Dempsey et al.
"The Effect of Irradiation of the Electret Depolarization of Polymethyl Methacrylate" by Kh. Solunov and P. Hedvig, in vol. 1, pp. 899-906 of the 1972 Published Proceedings of the Tihany Symposium on Radiation Chemistry.

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