LOUDSPEAKER TALKING DEVICE

摘要

PURPOSE:To contrive to high quality loudspeaker conference communication by controlling a variable loss circuit for voice switch based on a level of a transmission signal sent from a sound collection circuit or a level of a transmission signal level and a level of a reception signal incoming from a communication line. CONSTITUTION:A transmission signal sent from a microphone included in each loudspeaker (1-1-1-3) is detected by a voice switch control circuit 20 in a loudspeaker communication device 3. A reception signal reaching the device 3 via a talking line 3 is also detected by the circuit 20 simultaneously. The circuit 20 in the device 3 uses each detected signal to compare levels of inputs between each loudspeaker and a talking line and the loss of variable loss circuits 7-12 is inserted/removed based on the result of discrimination. Thus, howling or echo is prevented and pleasant loudspeaker talking is attained.