# Does the expression of amplitude modulated suppressed carrier even exist in reality?

I read that a negative frequency implies "forward" travelling wave and a positive frequency implies "backward" travelling wave, so.. does a suppressed carrier amplitude modulated wave not exist due to destructive interference? As it has 2 exact frequencies but one in negative and one in positive.

• The frequency bands of the information are not the same after modulation (the 2 sidebands exist separately). en.wikipedia.org/wiki/…. Also, where did you read this information? Commented Dec 30, 2019 at 14:50
• "Negative frequency" doesn't usually mean anything at all? Destructive interference can only happen at a single frequency - it sounds like this is a mangled explanation of how the carrier itself is suppressed? Commented Dec 30, 2019 at 14:51
• No - negative frequencies do not exist in reality. They are (fictitous) parts of mathematical tools only...
– LvW
Commented Dec 30, 2019 at 15:00
• blogs.zhinst.com/sadik/2013/08/dsb-sc Negative is below fc, but above 0 Commented Dec 30, 2019 at 15:38