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DTMF tutorial
Topic: Miscellaneous 7:58 pm EDT, Oct  3, 2001

"Most voice energy comes from the vocal cord's vibration that tends to reside in the low frequency group. A spectrum analyst of this vibration would show a discreet frequency with multiple harmonics and not a broad spectrum of frequencies, making it highly unlikely that a single voice could ever produce a valid DTMF signal. "

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DTMF tutorial



 
 
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