Noise suppressor for telecommunication system

Details Noise suppressor for telecommunication system Noise suppressor for telecommunication system

1974-01-30

1976-04-20

Griffin, Robert L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307237, 325411, 325474, 325478, 328165, H04B 1500

Patent

active

039522520

ABSTRACT:
A detector stage at a receiving station of a telecommunication system derives from an incoming modulated carrier a constant reference voltage lower than the minimum amplitude of the detected modulation signals which are fed to the base of an NPN transistor whose emitter receives the reference voltage through a resistor. The collector of the transistor, cut off from any direct-current supply, is coupled to a subsequent audio stage through a series capacitor and to ground through a shunt capacitor. Normally, the transistor is saturated and its emitter potential, closely following its base voltage, is practically duplicated on its collector. In the presence of large static, however, the noise pulses cut off the transistor as the shunt capacitor temporarily stores the magnitude of the immediately preceding signal amplitude.

REFERENCES:
patent: 2493045 (1950-01-01), Toth
patent: 2710347 (1955-06-01), Brady
patent: 3339144 (1967-08-01), Squires
patent: 3613012 (1971-10-01), Feistel

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