One way around this is to not use the computer five volts. Run the microphone through a wall-powered USB hub by itself . This is a 'bottom of the servicing bag' trick that can also be used to extend a USB cable if you need it to be longer than the usual 6 feet (2M).
We also assuming you're using the standard 2M USB cable, right? No extensions?
Is EMI the issue here?
kozikowski wrote:Do you have a radio or music player that takes a 9V battery or maybe multiple AA cells? A similar thing is happening inside the computer. The computer is supplying five volt battery up one of the wires inside the USB cable. It's also supplying a return pathway called ground. It sounds like you may be slowly losing the cable. Your cable is longer than normal and I bet if you reposition the mic or maybe move it around while you're using it, the buzz may some and go. I had a 12' USB cable do this recently. It ran a printer and I had no end of ratty failures and print jobs would not always start. All vanished when I put a new cable in.
USB is not an open-ended cable system. There are some very firm limits on length.
If there any way you can put a replacement cable in long enough to see if it works? Shorter is good. Did a shorter cable come with your printer?
kozikowski wrote:There are ways around that underwater thing,
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