I have some understanding of harmonics but I always hear about the 1st, 2nd, etc., harmonic. Do harmonics happen an either side of the signal? Is there a -1, -2, -3, etc., harmonic or does the 1st harmonic encompass the "harmonic" on either side?
if you mean a sub-harmonic below the primary frequency, those aren't normally generated by the non-linearities that generate harmonics.or does the 1st harmonic encompass the "harmonic" on either side?