Question about harmonic?

[jackie1116]

what is different between positive harmonic and negative harmonic ,why we need
to care positive harmonic ,don't care negative harmonic?

 

[hr_rezaee]

hi
harmonics with negative frequency are negative harmonic and harmonics with positive frequency are positive harmonic .
it depends application that we must care negative harmonic or not.

 

[electronics_kumar]

we cannot generate a negative frequency in our lab..anyway we are using it to represent a complex frequency signal