The audio terminal can be divided into two parts , namely the data transmitting end and the remote - control unit
2.
In this paper , its critical techniques and development be chiefly introduced first . and then the emphases is laid on the techniques and the design related to the audio terminal
3.
The calling machine hardware platform uses mcs51 microprocessor - at89c52 as the main controller . it receives instruction from the system computer and sends the code to the audio terminals . every room terminal is connected in bus mode with the calling machine through a five - line cable
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