LOUDSPEAKER COMMUNICATION DEVICE Russian patent published in 1998 - IPC

FIELD: wire communication, devices of duplex loudspeaker communication. SUBSTANCE: device includes reception path with loudspeaker connected across output , transmission path with electron key placed across input, microphone, amplifier, detector, comparator connected in series. Output of the latter is connected to controlling input of electron key. Device also has second detector and attenuator which controlling input is connected to output comparison circuit connected with its inputs to inputs of comparator, unit of correction of acoustic feedback and delay element. Unit of correction of acoustic feedback which inputs are connected to proper outputs of corresponding detectors and output to input of electron key is inserted to improved quality of broadcast speech information. Delay element is placed between output of reception path and output of attenuator. EFFECT: improved quality of broadcasts. 1 dwg