Telephone handset for use in noisy locations

Details Telephone handset for use in noisy locations Telephone handset for use in noisy locations

1986-06-16

1988-09-20

Ng, Jin F.

Telephonic communications

Terminal

Housing or housing component

381189, 381169, H04M 103

Patent

active

047730919

ABSTRACT:
A telephone handset for use in noisy locations has a noise cancelling electret transmitter which receives a normal acoustic input at the front end and a background noise acoustic input to the rear end. The input to the rear end is via a grill on the back side of the handset. A dielectric shield is positioned between the grill and the transmitter. A resistor is inserted in series with the transmitter to reduce the sensitivity and produce a lower than normal transmit level. Also, a filter is used to reduce the level of high frequency emphasis.

REFERENCES:
patent: 3627930 (1971-12-01), Tolman
patent: 3830988 (1974-08-01), Mol et al.
patent: 4178488 (1979-12-01), Nishihata
patent: 4237350 (1980-12-01), Ruzic
patent: 4400589 (1983-08-01), Synek et al.
patent: 4424419 (1984-01-01), Chaput et al.
patent: 4463222 (1984-07-01), Paradowski
patent: 4594478 (1986-06-01), Gumb et al.
patent: 4636591 (1987-01-01), Kuhfus et al.
patent: 4672666 (1987-06-01), Kuhfus
"Design of a Studio-Quality Condenser Microphone Using Electret Technology", W. Bevan et al., Journal of the Audio Engineering Society, Dec. 1978, vol. 26, No. 2, pp. 947-957.

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