I connect my android smartphone from audio jack output to my pc audio input and get a good analog sound signal. But when I connect this smartphone to the pc with usb data cable the analog sound becomes hissing e.g. music from smartphone overlaps with noises on pc.
Why does this happen?
How can I eliminate these noises? maybe I have to use some shielded cables? If yes - then audio or usb? or I need some sound direct box or something like that?


The problem was resolved by adding ground loop noise filter like this

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