Filter out noise from electrical wiring -- 2

In my home I would like to see if it's possible to filter out all noise (humming) being generated by an electrical device or lamp. I know it's not so hard to filter one device, but is it possible to filter all devices from a single point rather than each device individually? It's an older style home built around 1979 but has had many upgrades to include but not limited to: new breaker box, new switches for breaker, & some new wiring.