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I bought a display port switch so I could switch two DP computers to one monitor. It seems to be working fine and not dropping out like the previous one did, but it's introduced an audible digital noise style whine in the analogue old-style PC speakers which are connected to the monitor's audio out.
I could fix this by connecting directly to the computer of course, but is there an easy way to filter out the noise?
Maybe, it depends on the source of the noise. How is the DP switch powered ? It's likely to either be a noisy PSU or poor shielding on the switch
Sounds like a poor ground or similar perhaps? Is it 3.5mm jack at the monitor? Could try a ground loop isolator
ZIOCOM Ground Loop Noise Isolator https://amzn.eu/2Je60zH
The switch is USB powered. I've got an Anker USB 6-port power supply on my desk powering whatever needs power including my PC speakers and the switch. If I plug the switch into a battery instead, the noise disappears. But if I plug the speakers into a battery the noise also disappears. So I think that the ropey electronics in the switch are introducing noise into the power supply which then affects the (completely dumb analogue) speakers.
The USB power supply and the monitor supplying the audio are both plugged into the same 6-way power strip, if that makes a difference.
Solved by plugging the speakers into a different USB power supply!