FIELD: optics; protection of voice information against listening and recording indoor voice information using acoustic laser locating systems.
SUBSTANCE: device that functions to attenuate amplitude of reflected laser beam at the same time producing spurious acoustic signals has acoustic laser locating system operation sensor series-connected through trigger unit to input of acoustic signal shaping unit; first output of acoustic signal shaping unit is connected to window glass and its second output, to piezoid; output of power supply is connected to input of acoustic signal shaping unit and to input of trigger unit; absorbing and reflecting film is mechanically secured on window glass.
EFFECT: enhanced reliability of information protection against unauthorized takeoff.
1 cl, 2 dwg
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