FIELD: information technologies.
SUBSTANCE: in device for protection of a user's telephone set against not authorised acoustic control the block (1) connected to a user's telephone line controlling the state of a telephone set with two outputs "handset is free" and "handset is busy", the noise generator, the block of light indication, the block (2) of detection in a telephone line of special signals of guidance, the block (3) of detection of galvanic connection of devices of non-authorised acoustic control, mounted on a telephone line in front of the block (1) controls of a state of a telephone set, and filters (4) system of the inferior frequencies and filters-terminators of the small amplitudes, disposed before a protected telephone set, and also the signals (8) adder, the block (7) of correction of voltage level in a telephone line, the noise generator consists of the block (5) generating "white noise" and the block (6) generating high-frequency noise-like signal, and the indication block (9) in addition contains the block of sound indication.
EFFECT: increase of protection efficiency of a user's telephone set from non-authorised access.
3 dwg
