Apparatus for the surveillance of one or more electrical signals

Details Apparatus for the surveillance of one or more electrical signals Apparatus for the surveillance of one or more electrical signals

1977-04-14

1979-02-20

Schaefer, Robert K.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

139336, 340677, H01H 8300

Patent

active

041409191

ABSTRACT:
Apparatus for monitoring one or more electric signals representing movement of objects such as threads, strips, or the like during one or more surveillance time periods. A first signal detector detects the electrical signals representative of the movement. A trigger-signal-generating circuit generates a trigger signal upon detection of an electrical signal of at least a predetermined magnitude. A second signal detector is responsive to trigger signals to activate a surveillance circuit which indicates detection of a moving object. The apparatus includes a device for increasing the sensitivity of one or both of the signal detectors during all or part of the surveillance period.

REFERENCES:
patent: 3757831 (1973-09-01), Loepfe et al.

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