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Author Topic: DTMF  (Read 2634 times)
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king
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« on: January 04, 2010, 10:57:53 10:57 »

hi!
BY DTMFOUT command in Proton we can send DTMF tones on the telephone line but how we can receive these DTMF signals on the receiving end if both transmitted and receiving sides are controlled by the PIC microcontroller
« Last Edit: January 04, 2010, 11:53:51 11:53 by king » Logged
oldvan
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« Reply #1 on: January 04, 2010, 03:42:57 15:42 »

Looks like decode can be done in software, here's an example using a 16F877:

http://dtmf.voipintouch.net/content/dtmf.htm

Otherwise hunt down a DTMF decoder chip and let its hardware do the work,
feed the outputs to PIC inputs.
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glenndr_15
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« Reply #2 on: January 04, 2010, 04:30:49 16:30 »

Greetings!
here is a link for a DTMF decoder
 http://electronics-diy.com/electronic_schematic.php?id=509
It uses MT8870 DTMF decoder and PIC microcontroller to decode telephone tones.

you can also find information about DTMF/DTMF projects in this link
 http://www.discovercircuits.com/D/dtmf.htm

Enjoy!

Best regards,
glenndr_15
« Last Edit: January 04, 2010, 04:42:41 16:42 by glenndr_15 » Logged
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