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modulation is the process of varying a periodic waveform, i.e. a tone, in order to use that signal to convey a message
but this modulation that you speak of. what is it?
The modulation I'm talking about is:take sensor reading with IR xmitter offtake sensor reading with IR xmitter onsubtract both values (thereby eliminating environmental noise)
I'm trying to find out now how fast can a phototransistor switch on-off.