Alarm system having synchronizing pulse generator and synchroniz

Details Alarm system having synchronizing pulse generator and synchroniz Alarm system having synchronizing pulse generator and synchroniz

1997-04-23

1998-12-15

Wu, Daniel J.

Communications: electrical

Condition responsive indicating system

With particular system function

340506, 327 18, G08B 2900

Patent

active

058501789

ABSTRACT:
A pulse detection circuit to be used in combination with a generator of a train of synchronizing pulses. The detection circuitry remains in a first, inactive state in the presence of an ongoing sequence of synchronization pulses. In the event of a detected absence of synchronizing pulses for a predetermined period of time, the detection circuitry changes state and generates an electrical output signal indicative of one or more missing synchronizing pulses. The detection circuitry can incorporate either digital or analog timing circuitry.

REFERENCES:
patent: 5525962 (1996-06-01), Tice
patent: 5557262 (1996-09-01), Tice
patent: 5598139 (1997-01-01), Karim et al.

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