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?


closed as off-topic by Stanley Pawlukiewicz, Matt L., Peter K. Apr 25 at 14:29

  • This question does not appear to be about signal processing within the scope defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ not a signal processing question – this is probably about insufficient noise suppression on the shared grounds. You'll be better of on electronics.stackexchange.com ; my guess would even be that very similar questions have been asked on there. $\endgroup$ – Marcus Müller Mar 16 at 0:41
  • 5
    $\begingroup$ I'm voting to close this question as off-topic because it's not a signal processing question, but an electrical engineering question. However, similar questions have been asked on electronics.stackexchange.com before, which bars migration to that site. $\endgroup$ – Marcus Müller Mar 21 at 17:14

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


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