功能强大，具有很高的效率和准确率；能够很大提高工作效率-powerful functions with very high efficiency and accuracy; Can be greatly improved work efficiency

ht9170芯片的dtmf解码源程序，据作者说有验证过。准确率很高。-ht9170 dtmf decoding chip source, according to the authors say there is validation. The accuracy rate is high.