telephone tone decoder

MT8880产生发送和接收译码各使用了一片集成电路，而DTMF双向收／发集成电路MT8880专门为双音频信号的收、发而设计，，它既能产生发送双音频信号，又能对双音频信号进行接收译码，还能判断各种信号音(拨号音、回铃音、忙音)。-good 已通过测试。 -MT8880 generate send and receive decoding the use of an integrated circuit, DTMF bi-directional transmit/receive IC MT888

MT8870双音解码电话远程控制系统的源码-This graduation design is in order to achieve the STC89C52 single-chip microcomputer as the core of telephone remote control electric equipment, the system main chip is STC89C52 singlechip, dual tone decoder chip MT8870