VC6.0 completed using DTMF identification code. The voice of key data on the use of Goertzel algorithm frequency identification, and then predict the location of the button press.

dtmf_dll_V2.0
.............\audio.cpp
.............\Debug
.............\dtmf_dll.def
.............\dtmf_dll.dsp
.............\dtmf_dll.dsw
.............\dtmf_dll.h
.............\dtmf_dll.ncb
.............\dtmf_dll.opt
.............\dtmf_dll.plg
.............\g721.c
.............\g72x.c
.............\g72x.h
.............\goertzel.cpp
.............\ReadMe.txt
.............\StdAfx.cpp
.............\StdAfx.h
.............\~VC5.tmp

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