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A SECURITY ALARM DEVICE

  • US 20100007494A1
  • Filed: 08/01/2006
  • Published: 01/14/2010
  • Est. Priority Date: 08/01/2006
  • Status: Abandoned Application
First Claim
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1. A security alarm device including an object device arranged at each protected object and comprising:

  • a generator-shaper of coded signals, a power amplifier, and an antenna;

    a user'"'"'s device being at the user, comprising an antenna, an input matching circuit, an input bandpass filter, an amplifier, a bandpass filter comprising an N-channel selector for selecting signals on presence of object devices, a solver adapted for polling object devices and issuing a signal about presence of a corresponding object device within a monitored area, a control circuit intended for switching the alarm device on, and a device for visualizing information, that are all connected in series, characterized in that said user'"'"'s device additionally comprises an antenna switch with two signal inputs and one control input, connected in series;

    a generator-shaper of coded signals, which is connected to the control circuit additionally intended for cyclic issuance of a command for shaping a coded signal-request to the said generator-shaper, and a power amplifier connected to one of the antenna switch signal inputs, a matching input circuit being connected to the other of the antenna switch signal inputs, the control input at the user'"'"'s device antenna switch is connected to the said control circuit, the object device further comprises an antenna switch with two signal inputs and one control input, the input matching circuit of the object device being connected to the first signal input and the power amplifier being connected to the second signal input, and also comprises an input bandpass filter, a signal amplifier, a bandpass filter, a selector for identifying a received signal, a solver for making a decision on presence of a corresponding signal, a control circuit for cyclically putting the antenna switch into the signal transmission mode or the signal reception mode, switching a generator-shaper of coded signals from the object device into the emission mode, and for turning a sound alarm on, which are all connected in series, the control input of the object device antenna switch being connected to its control circuit.

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