Detection circuit for a video intrusion monitoring apparatus

Details Detection circuit for a video intrusion monitoring apparatus Detection circuit for a video intrusion monitoring apparatus

1982-09-28

1984-06-19

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340511, 340526, 358108, G08B 2500, H04N 718

Patent

active

044555504

ABSTRACT:
An intrusion monitoring apparatus wherein horizontal and vertical sync signals separated from the video signal generated by a monitor television camera are used to produce window pulses having respective timings and lengths corresponding to discrete spots on the video frame screen, said window pulses being used for gating the input video signal, sudden level change of the respective gated video signal portions being detected to provide an audible and/or visual alarm.

REFERENCES:
patent: 3580998 (1971-05-01), Hammond
patent: 4148062 (1979-04-01), Kamin
patent: 4257063 (1981-03-01), Loughry et al.

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