Plain Old Telephone Service@
I am a fresh graduate working for a telecom company. Here i have a doubt on dtmf. Kindly clarify my doubt. Why we need dual tone instead of single. Any way we are going to pass a single frequency from dtmf filter after mixing the two generated frequences. Instead of doing that we can have a single frequency with high quality filter. Regards Ananth
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<A HREF="http://techref.massmind.org/techref/pots/dtmf.htm?key=dtmf"> DTMF Dual-tone-multi-frequency aka Touch Tones</A>
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