DEVICE FOR PROTECTING ENCLOSED LOCATIONS AGAINST UNAUTHORIZED PICKUP OF VOICE INFORMATION Russian patent published in 2004 - IPC

FIELD: optics; protection against eavesdropping and recording of voice information using laser acoustic location systems.

SUBSTANCE: device that depends for its operation on automatic generation of masking signal (at wavelength of eavesdropping device laser) for photodetector of laser acoustic location system and also on production of false acoustic (voice-like) signals has cat's eye, lifting rod, spring, lock, platform, and shielding case; in addition it is provided with piezoid, cat's eye base, lock releasing mechanism, spring compression unit, spring compression unit closer, spring compression mechanism, photodetector, amplifier, acoustic signal generating unit, as well as power supply; photodetector is series-connected through amplifier to lock releasing mechanism which is mechanically coupled with shielding case fixed on platform; photodetector is also connected through amplifier to input of acoustic signal generation unit whose output is connected to piezoid and mechanically coupled with cat's eye fixed on its base which is mechanically joined with lifting rod mounted inside spring, one of its ends being rigidly fixed with cat's eye base; spring compression unit closer is electrically connected to spring compression unit and mechanically coupled with spring compression mechanism; the latter is mechanically joined with cat's eye base; output of power supply is connected to photodetector, amplifier, lock releasing mechanism, spring compression unit closer, spring compression unit, and acoustic signal generation unit.

EFFECT: enhanced reliability of protection against unauthorized pickup of voice information.

1 cl, 2 dwg