Telephone handset for use in noisy locations

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

H - Electricity

04

M

349/59

H04M 1/03 (2006.01)

Patent

CA 1280202

TELEPHONE HANDSET FOR USE IN NOISY LOCATIONS Abstract of the Disclosure 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, d filter is used to reduce the level of high frequency emphasis. - i -

511616

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