I have this buzzing background noise when any sound is played, including for example the small ping when you adjust the volume of headset/speakers that Windows plays.
I've checked that all microphones (laptop internal & headset mic) are not set to 'Listen to this device' in the Windows 7 sound options, I've tried disabling them all anyway and this still doesn't help. Windows also does not give me the option to use any of the normal enhancements such as noise cancellation with this headset.
I've searched a lot on the internet so far the only causes I found where the 'Listen to this device' option and interference from a WiFi device. I tried turning off both the laptops wifi and my phone's, it didn't help.
Here is a link to the device: http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?slg=en&scy=ru&ctn=SHB9100/00
Another example of when I hear the noise is when a YouTube video is open even if it is paused, I end up upping the volume just to drown out the buzz. Once I close the YouTube video it's gone again.
Any help would be greatly appreciated