| 摘要 |
The inventive security alarm device based on noise-like signals consists of a transmitting unit ( 1 ) which is arranged on each guarded object and comprises a serially arranged pseudorandom sequence generator ( 2 ), a noise radiosignal conditioner ( 3 ), power amplifier ( 4 ), a transmitting antenna ( 5 ), a receiving unit ( 6 ) which is arranged in a user and comprises a receiving antenna, an input filtering and matching chain ( 8 ), a bandpass amplifier ( 9 ), unit for optimal processing a noise-like signal on acoustic surface waves ( 10 ), a release device ( 14 ) and an alarm unit ( 15 ). The transmitting unit ( 1 ) and the receiving unit ( 6 ) have the same signal-carrier frequency. Said receiving unit ( 6 ) comprises N in-parallel units for optimal processing the noise-like signal on the acoustic surface waves ( 10 ), a commutator ( 11 ) having N signal inputs, N signal outputs and a control input, a control system ( 12 ) for the commutator ( 11 ) provided with two inputs and outputs one of which is connected to the control input of the commutator ( 11 ), a dual-threshold decision system ( 13 ) provided with N inputs and two outputs. Each of N signal outputs of the commutator ( 11 ) is connected to one of N inputs of the dual-threshold decision system ( 13 ) whose one output is connected to the input of the release device ( 14 ), the second output thereof being connected to one of the inputs of the control system ( 10 ) for the commutator ( 11 ). In addition, the alarm unit ( 15 ) comprises a liquid-crystal display ( 17 ). The output of the release device ( 14 ) is connected to the input of an alarm device ( 16 ) and to the second input of the control system ( 10 ) for the commutator ( 11 ), the second output thereof being connected to the input of the liquid-crystal display.
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