Telephone transmitter including an electret transducer

Details Telephone transmitter including an electret transducer Telephone transmitter including an electret transducer

H - Electricity

04

M

379/101, 26/125,

H04M 1/03 (2006.01) H04R 1/04 (2006.01) H04R 19/01 (2006.01)

Patent

CA 1152205

TELEPHONE TRANSMITTER INCLUDING AN ELECTRET TRANSDUCER Abstract of the Disclosure A telephone transmitter including an electret transducer is connected to an electrical circuit mounted in the transmitter housing. A resistor which can be of varying value is also connected to the circuit, the value of the resistor being adjusted to bring the operating characteristics within predetermined values. This is done by applying a sound signal of known frequency to the transducer and measuring the output characteristics of the transducer. This enables the suitable value of resistor to be connected into the circuit. By this means variations arising from varying atmospheric conditions at assembly, and other causes, can be allowed for. The metallized strip or film of the electret is preferably mounted with a very slight Vee shaped formation to avoid tight manufacturing tolerances which occur with a straight, or flat, strip.

365652

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