Description: This procedure used to detect whether an audio file with a DTMF signal, if so, what will be its detection. Procedures to derive the first use of Goertzel algorithm to FRAMESIZE [default 200] for the size of data in an eight point DTMF frequency energy. Of the Goertzel algorithm for the calculation of coefficients instead of 2* cos [2* pi* k/N], instead of using the 2* cos [2* pi* fn/fs], this can reduce the error. Identified eight frequency energy use after a series of sentences to determine the threshold has no DTMF signal, as well as the signal is.
File list (Check if you may need any files):
dtmf
....\check.cpp
....\Debug
....\dsp.dsp
....\dsp.h
....\dsp.ncb
....\dsp.opt
....\dsp.plg
....\dsp_main.cpp
....\dsp_main.dsp
....\dsp_main.dsw
....\dsp_main.ncb
....\dsp_main.opt
....\dsp_main.plg
....\dtmf.dat
....\dtmf.txt
....\dtmf2.dat
....\mixmusic.dat
....\mixnoise.dat
....\mydata.dat
....\noise.dat
....\result_output.cpp
....\新建 文本文档.dat.bak
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