File list (Check if you may need any files):
telephone\电话相关\参考例子_C51程序.txt
.........\........\FSK解码原理及实现方法.txt
.........\........\SPDA_DTMF软拨号.txt
.........\........\电话相关技术问题.txt
.........\........\嵌入式系统中的MODEM.txt
.........\........\DTMF芯片\HT9200DTMF发生器.pdf
.........\........\........\MT8880DTMF收发器.pdf
.........\........\........\电话芯片.txt
.........\........\........\HT9170DTMF接收器.pdf
.........\........\........\DTMF双音频设计.pdf
.........\........\参考例子_收发ASM-1.txt
.........\........\参考例子_收发ASM-2.txt
.........\........\DTMF芯片
.........\电话相关
telephone
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