my question maybe seems very simple but, I'm not familiar with the answer of that;
what is the meaning of harmonic of the signal exactly?
I know the harmonics of the signal are signals whoes frequencies are multiple of the frequency of the fundamental component of the main signal but I want to know about the deep concept of that, actually; my exact question is:
what is the meaning of having harmonic?
some signal has harmonic and some other not; what is the difference between these two signal in properties?