See related: Buzz or Hum in Computer Speakers.
With analog headsets, there are some other ways of fixing the problem by isolating the signal better. With USB headsets, the only way to fix this is to plug your laptop into a grounded outlet. This is a surefire sign you have a ground loop problem. Sometimes, if your laptop or a USB accessory is made of metal, you might notice the buzz goes away if you touch a metal part. When you plug in your laptop to a grounded outlet (3 prongs), the circuits for audio in the laptop have a 'ground' signal to make sure the audio doesn't get any interference. The problem is caused by a well-known phenomena, a ground loop. The filter includes a female 3.5mm input, a male 3.5mm output, and 10 inches of cable for each jack.
3.5 MM GROUND LOOP ISOLATOR ADAPTER PORTABLE
On a PC, different adapters work differently, but hopefully you have a power adapter with a 3-prong plug. Solution: PAC's SNI-1/3.5 preamp noise filter plugs in between your receiver's auxiliary input and your portable music player to help reduce noise caused by a ground loop.
On a Mac, if you're using the Apple power adapter without the extra power cable (with a 3-prong plug instead of the 2-prong plug), you may get a buzzing sound. Solution: about 99% of the time, the problem is fixed by simply plugging the laptop into a grounded (3-prong) outlet. Almost every time I hear someone having this trouble, they're having the problem while using the headset with a laptop. Problem: I've heard from a lot of people about hum or background 'buzz' in recordings and Skype conversations when using a USB headset (like the one I have, the Logitech USB Headset H350).
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