I learned long time ago....
When a carrier (100KHz) is modulated by a signal (5KHz),
an upper side band (105KHz) and a lower side band (95KHz) will appear.
I had known it only logically. Now, when I tried to mix the carrier and upper side and lower side two bands, I could see a typical AM wave form.
Then I again knew the AM wave is just only including 3 parts, a carrier, an upper side band, and a lower side band. It dosen't include any other frequency waves. Is it too late that I found it...?
