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介绍了用单片机软件模拟双音多频 (DTMF)自动拨号的原理 ,并给出了由电阻网络组成的D/A转换器。实际应用表明该方法是可行的 ,具有重要的应用价值。
The principle of DTMF automatic dialing using single chip microcomputer software is introduced, and the D / A converter composed of resistor network is given. Practical application shows that the method is feasible and has important application value.