FIELD: automatic guarding systems. SUBSTANCE: device has a TV camera 2; differentiating elements 3, 5, 6, 8, and 10; pre- amplifier 4; push-pull amplifier 7; output amplifier 8; automatic gain regulators 11, 16; integrating amplifiers 12, 13, 14, and 17; ripple filter 15; high- and low-level threshold elements 18, 19, respectively; and registering unit 20. EFFECT: increased reliability of registration.
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