Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-11-17
1979-06-12
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307261, 340539, 340658, 325364, 331113R, 328138, G08B 2300, G08B 2900, H03K 110, H03K 1728
Patent
active
041581482
ABSTRACT:
A circuit for generating an indication in response to the occurrence of a predetermined condition is characterized by means for detecting the occurrence of the condition and for generating the indication after the condition has existed for a selected time. In a preferred embodiment of the circuit, the condition to be detected is a warning signal preceding a radio broadcast of a severe weather report, and the circuit includes an input stage for receiving the signal and for generating a control voltage which increases in value with increasing duration of the signal. The control voltage is applied to an input to a multivibrator, and after a first period of time increases to a value sufficient to place the multivibrator in an oscillating state. The output from the multivibrator is connected both with an alarm generator to indicate the occurrence of the warning signal, and is applied back to the input to the multivibrator through a feedback circuit to maintain the voltage thereat, after a second period of time, at a value which sustains operation of the multivibrator. This latches the alarm in an "on" condition until the multivibrator is reset to its non-oscillating or quiescent state.
REFERENCES:
patent: 3104356 (1963-09-01), Hedger
patent: 3449695 (1969-06-01), Marsh
patent: 3566283 (1971-02-01), Diebler
patent: 3653018 (1972-03-01), Budrys
patent: 3792290 (1974-02-01), Brocker
patent: 3984825 (1976-10-01), Fujita
patent: 4039959 (1977-08-01), Pattantyus-Abraham
patent: 4072903 (1978-02-01), Harris
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