The system uses MT8880 (made by MITEL company) as the decoding chip of DTMF telephone and chip AT89C51 as the microcontroller, so, the circuit is simple and adaptive.
该系统用MI-TEL公司的DTMF收发器MT8880芯片作为电话双音多频信号的解码核心，用AT89C5 1单片机作主控器，电路简单灵活。
The system uses MT8880 (made by MITEL company) as the decoding chip of DTMF telephone and chip AT89C51 as the microcontroller, so, the circuit is simple and adaptive.
该系统用MI-TEL公司的DTMF收发器MT8880芯片作为电话双音多频信号的解码核心，用AT89C5 1单片机作主控器，电路简单灵活。
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