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Dec 30, 2016 at 10:42 comment added Andy aka Non-coherent signals (or noise sources) add as the square root of the two terms squared. Do you understand this? If not then you need to do some googling. The picture has no impact on what I'm saying.
Dec 30, 2016 at 10:26 comment added Danny_Kim Thank you for good explanation. However, I do not understand why it happens. I drew a picture for better expression of my curiosity.
Dec 29, 2016 at 10:43 history answered Andy aka CC BY-SA 3.0