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genxium
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Homework Statement
I'm going to do the experiment that generates a square wave using the 555 timer this weekend, but I'm wondering why sometimes we have to modulate the square waves to sin waves, and decode them in the terminal receiver?
Could square wave(or any other non-sin wave) itself just propagate in the air or vacuum or any media without modulation?
Homework Equations
Is it because of diffraction while propagating? Maybe the intervals between some material molecules may cause a bad influenced diffraction, for low frequency square wave?
The Attempt at a Solution
I suppose it's mainly about diffraction for low frequency wave, is it? Any idea is appreciated~
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