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DTMF Schematics

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DTMF Remote control - A software DTMF decoder for PIC 16F87X

DTMF Remote control - A software DTMF decoder for PIC 16F87X

The DTMF detector is integrated in software. All the logic requested to receive and decode DTMF Commands over the phone line is integrated in the 16F877 chip.

http://www.geocities.com/constantinescuradu/content/dtmf.htm

DTMF - Most Of What You Wanted To Know

DTMF - Most Of What You Wanted To Know

http://www.epl.co.uk/info3.htm

Generating DTMF tones using soundcard

Generating DTMF tones using soundcard

http://users.tkk.fi/~then/mytexts/dtmf_generation.html