DTMF tones are easy to decode — at least now. We’ve got DSP chips to do the job all in one package, or we could roll a simple circuit from phase-locked loops. But how did the phone company do ...
One was converting the rotary pulses into DTMF tones. The other was making the cordless phone that he gutted recognize ... This switch is used to control a small circuit that ‘presses’ the ...
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