Upstairs circuit in house is noisy
One possible cause for electrical noises are loose connections on the back of the outlet. For example, where the internal mains wiring physically connects to the scews or push in terminals on the outlet, if these are not tight, or are worn out and loose, a noise can be generated.  

Recommend checking and replacing if necessary.  Also, when replacing a outlet you might need to replace with a AFCI and or GFCI/DFCI type outlet per code requirements.  Some jurisdictions may not require this but you can still do it for safety.