Public address system Digitization network controls servers:light-tougut screen easy to operate Digital transmission, distortion smaller The signal to noise ratio is high Use the local area network movement which uses Realizes the multi- nets to gather one Also may use on the internet Passes on the multichannel sound source Select or multi- spots select wilfully Fixed time sound source Passable microphone inserts the entrance or cd carries on the recording Edition self-restraint program Carry on jurisdiction disposition
