Noise cancelling telephone transmitter insertable in telephone h

Details Noise cancelling telephone transmitter insertable in telephone h Noise cancelling telephone transmitter insertable in telephone h

1983-12-19

1986-04-22

Dwyer, James L.

Electrical audio signal processing systems and devices

Acoustical noise or sound cancellation

Adjacent ear

179111E, 179121R, 381 91, H04R 1901, H04M 103

Patent

active

045847029

ABSTRACT:
A noise cancelling telephone transmitter comprising a cap and a cup coupled together so as to form an assembly insertable as a unit in the receptacle of a telephone handset. The cap is provided with an opening for passing sound. The inlet of the cap opening is covered by an acoustically deformable material such as a Mylar membrane. An electret microphone is mounted within the assembly such that the microphone acoustic entrance faces the outlet of the cap opening. A ring-shaped acoustic damping element is interposed between the cap underside and the plane of the microphone acoustic entrance. The cap is provided with a depending acoustic baffle which surrounds the damping element proximate the plane of the microphone acoustic entrance.

REFERENCES:
patent: 664904 (1901-01-01), Skold
patent: 1372862 (1921-03-01), Carmody
patent: 2118993 (1938-05-01), Volf
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patent: 3536862 (1970-10-01), Weingartner
patent: 3660602 (1972-05-01), Thompson
patent: 3830988 (1974-08-01), Mol et al.
patent: 4009355 (1977-02-01), Poradowski
patent: 4424419 (1984-01-01), Chaput et al.
patent: 4449236 (1984-05-01), Walker, Jr.
patent: 4463222 (1984-07-01), Poradowski

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