DTMF信号的接收

THE RECEIPT OF DTMF SIGNAL

分析了单片ＤＴＭＦ接收器的主要特性，设计了多路ＤＴＭＦ接收器，讨论了其主要部件的逻辑函数，给出了在我们研制的程控交换机（ＰＡＢＸ）中多路ＤＴＭＦ接收器的原理框图．结果表明，在输入ＤＴＭＦ信号幅度不小于－２３ｄＢ时，系统工作可靠．

The major characteristics of monochip DTMF receiver are analysised. The multiDTMF receiver is designed and major logic functions are discussed. The block diagram of system in self-designed PABX is given. The results show that the system can operate reliably if coming signals are greater than-23dB.