Kovalchuk Y. Method of infrasonic protection of speech information in the premises from possible drain by an optic-electronic technical channel

Thesis is devoted to solution of an actual research problem – a creation of the new method of infrasonic protection of speech information in the premises from laser intelligence systems. Existing methods of information protection are analyzed. They have two main lacks: create noise in the premises, which leads to discomfort during the negotiations, and unmasks protected premises. Creating infrasound method for protecting the speech information can get rid of these shortcomings. In the thesis it is developed a method of infrasonic protection of speech information in the premises during acoustic information retrieval based on probing of window glass by a laser microphone, which is based on usage of angular modulation of laser beam by window glass fluctuating, caused by a mix of insecure signal and interfering signal, which causes to overlap of the speech frequency range and provides the necessary level of masking a dangerous signal.