CONFERENCE CALL DEVICE WHICH IS CONTROLLED BY VOICE Russian patent published in 1997 - IPC

FIELD: electric communication equipment. SUBSTANCE: device has n user sets each of which has loudspeaker and microphone circuit which has microphone and amplifier. In addition device has N units for automatic switching of phone circuits each of which has voice detector which is designed as compensating voice control device according to patent certificate 1062895. In addition device has first, second and third gates, delay line, first detector and first receiver of control signals, first NOT gate, first flip-flop, signal board and receiving amplifier. In addition device has N units for automatic detection of operating mode, each of which has fourth gate, second detector and second receiver of control signals, second and third NOT gates, second flip-flop and unit which locks other microphone circuits of user set except one in this set. In addition device has signal unit and power splitting unit. EFFECT: increased reliability of operations in long-distance calls under high-level acoustic noise when non-directed microphones are used. 3 cl, 4 dwg