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PC-controlled DTMF decoder

PC-controlled DTMF decoder
Most of you will be aware that DTMF/telephone dialing signals are two-tone combination that may be recorded on any cheap tape recorder, just like speech, Playing back these tone pairs into a suitable decoder should reproduce the digit originally pressed on the telephone. The use of a PC as a visualization terminal allows the electronics you need to implement a DTMF decoder to be reduced to its most elementary form.
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