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Dual Tone Multi-Frequency encoder / decoder: Telephony
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README.md

DTMF

This is a collection of useful infos for DTMF .

http://en.wikipedia.org/wiki/Goertzel_algorithm
http://www.black-aura.com/blog/2011/12/10/python-implementation-of-the-goertzel-algorithm-dtmf-decod
http://xoomer.virgilio.it/sam_psy/psych/sound_proc/sound_proc_python.html
http://www.douban.com/group/topic/6109154/
https://bitbucket.org/blackaura/python-dtmf-decoder
http://www.mediacollege.com/audio/tone/dtmf.html
http://gitorious.org/dtmf-generator

FSK

http://en.wikipedia.org/wiki/Frequency-shift_keying
http://code.google.com/p/arms22/
hijack:

http://web.eecs.umich.edu/~prabal/projects/hijack/
http://code.google.com/p/hijack-main/
https://github.com/ab500/hijack-infinity.git
http://www.seeedstudio.com/depot/hijack-development-pack-p-865.html
http://www.creativedistraction.com/demos/sensor-data-to-iphone-through-the-headphone-jack-using-arduino/