Noise canceling transmitter

Details Noise canceling transmitter Noise canceling transmitter

1980-03-05

1981-09-08

Brown, Thomas W.

179 1P, 179187, H04M 119, H04R 2102

Patent

active

042886635

ABSTRACT:
This transmitter is designed for installation in a telephone handset to replace a standard carbon transmitter, for the purpose of excluding the ambient noise from the telephone lines, so that only the voice of the speaker is transmitted. This transmitter is designed to be installed by a person unskilled in the telephone art. The orientation of this transmitter with respect to the handset structure is critical and is indicated to the person inserting it by markings on the face of the transmitter housing, together with appropriate instructions. This transmitter is of the carbon type, and has improved electrical connections between internal contacts which engage the carbon and external contacts which engage conductors in the handset housing.

REFERENCES:
patent: 2483317 (1949-09-01), Laurent
patent: 2748882 (1956-06-01), Skelton
patent: 3830988 (1974-08-01), Mol et al.

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