A contact microphone can be used to pick up sounds through sound wave vibration on walls, windows, doors & materials glass, timber, and concrete. Information can be transferred from the microphone through a wire connected to a listening device, recording device or modulated into radio waves and then transmitted to an unwanted listener outside of the room, or even transmitted to any where in the world if GSM transmission technology is utilised.
Sound masking systems such as the ANG-2200 are designed to create a perimeter of noise around a target area that defeats wired microphones inside of walls, contact microphones, laser reflections from windows and audio transmitters located in AC outlets.
ANG-2200 injects noise into the environment perimeter and not directly into the environment. This process creates a countermeasure to defeat eavesdropping devices that rely on acoustic leakage.
Please visit the website link below for further information about ANG-2200.
ANG-2200
PJL 2nd January 2010
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