Security and alarm system employing a particular pulse width dis

Details Security and alarm system employing a particular pulse width dis Security and alarm system employing a particular pulse width dis

1987-11-17

1989-07-11

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307234, 307518, 340539, 375 22, H03K 5153

Patent

active

048475777

ABSTRACT:
A security and alarm apparatus has a pulse width discriminator circuit which includes: a monostable multivibrator having a trigger input connected to a data input of a flip-flop, a data output connected to a clock input of the flip-flop, and a pulse width control input; and a pulse width control circuit connected to the pulse width control input which causes a pulse produced by the monostable multivibrator to have one width when the flip-flop is in a first state and a larger width when the flip-flop is in a second state, the flip-flop producing at its data output a signal which is a logic high voltage when the frequency of an input signal at the trigger input has exceeded a first predetermined frequency and until it thereafter falls below a second predetermined frequency less than said first predetermined frequency, and which is a logic low voltage when the input signal has fallen below the second predetermined frequency until the input signal again exceeds the first predetermined frequency. The apparatus includes a plurality of sensors which can each detect an alarm condition, a radio transmitter which transmits a detected alarm condition to a radio receiver having an output connected to the trigger input, and an arrangement producing a display in response to the output of the flip-flop.

REFERENCES:
patent: 3943382 (1976-03-01), Hermansdorfer et al.
patent: 4112317 (1978-09-01), Everswick
patent: 4211982 (1980-07-01), Smith
patent: 4247823 (1981-01-01), Vun Kannon, Jr.
patent: 4535297 (1984-01-01), Puckette
E. E. Pearson, "One-Shot/Flip-Flop Pairs Detect Frequency Bands" Electronics, Apr. 24, 1972, p. 104.

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