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A comment on Dry erase board lined with IR sensors to record pen strokes [video]. Parent comment

Re:Dry erase board lined with IR sensors to record pen strok... by CamperBob2 on Saturday September 12, 2015 @03:48AM (#10207568)
Don't these types of systems always use AC modulation for just that reason?
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Re:Dry erase board lined with IR sensors to record pen strok... by joezydeco on Saturday September 12, 2015 @12:09PM (#10208430)
Usually. Not always.
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