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介绍了双音多频（DTMF）信号的特点和拨号方式，以及双音多频信号硬件译码电路的原理；着重论述了利用软件对双音多频信号进行检测和识别的原理和方法。
This paper introduces the characteristics and dialing modes of DTMF signals and the principle of DTMF decoding circuits. The principle and method of detecting and recognizing DTMF signals by software are emphatically discussed.