This is also known as a ground shunt, or simply a shunt. Electricity always follows the path of least resistance, so spurious current runs down the ground wire rather than the cable’s shield. The second method is to run a wire that’s less resistive than the USB/HDMI cable shielding from the case of the USB audio interface or HDMI-connected audio component to the case of your computer. These are sometimes called a ferrite bead. You can also buy a clip-on ferrite noise suppressor). One is to use a cable with a ferrite noise suppressor sleeve (that big round slug at one end. There are three methods for removing USB (and HDMI) cable noise.
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