该系统由以单片机at89c51和双音多频mt8870解码芯片为核心的系统硬件及软件组成。

It is composed of software and hardware, with single chip AT89C51 and DTMF decoding chip MT8870 as its cores.

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双音多频(DTMF)是一种在话音信道用音调来表示数字的方法，它可以用来在模拟话音信道传输信令，因此在通信中有广泛的应用。

Provide (DTMF) is a voice channel and tone to represent Numbers method, which can be used to transmit analog voice, so in communication has been widely used.

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介绍了一种计算机通过利用双音多频(DTMF)码进行控制的多媒体数学集中控制系统的工作原理。

The authors introduce a principle that the computer controls the multimedia teaching centralized monitoring system by using of DTMF.

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