Adjustment of operating characteristics of a telephone transmitt

Details Adjustment of operating characteristics of a telephone transmitt Adjustment of operating characteristics of a telephone transmitt

1980-11-28

1983-05-24

Schreyer, Stafford D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307400, H04R 1904

Patent

active

043852092

ABSTRACT:
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.

REFERENCES:
patent: 3663768 (1972-05-01), Madsen et al.
patent: 3816671 (1974-06-01), Fraim et al.
patent: 4188513 (1980-02-01), Morrell et al.

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