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Mouse noises

 
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heiowge
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Joined: Wed Feb 27, 2008 8:21 pm
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Location: Cheshire, UK

PostPosted: Fri Dec 13, 2013 10:40 pm    Post subject: Mouse noises Reply with quote

Any idea why my headphones quietly shriek at me every time I move the mouse?

When I move it, it sounds a bit like an old tape drive. When I move the scroll wheel, it gives me a low pitched buzz.
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guy
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Joined: Thu Apr 07, 2005 1:07 pm
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Location: Worcestershire

PostPosted: Sat Dec 14, 2013 12:40 pm    Post subject: Reply with quote

That low-pitched buzz is obviously a cat growling at the mouse whenever it moves. If the tape-like tweeting is a canary then it's probably a Sylvester, otherwise a Tom.

More seriously, it sounds like old-fashioned analogue interference. The audio pitch of the interference matches the mouse signalling data rate - movement has higher resolution than scrolling. The mouse circuitry is leaking the signal as electrical noise and the audio analogue output circuit is picking it up. Hard to say whether the mouse circuit is leaking more noise than it should or whether the audio is more sensitive than it should be.

Do your headphones plug directly into the PC or a separate audio system?

Typical causes include: an earthing problem, otherwise known as the 0 V line. Could also be a common +V supply rail. One of the connectors might be loose, dirty or faulty, or even the mouse itself. Do the audio and mouse sockets share a common wiring connection back to the motherboard? Do you have a spare mouse and/or headphone set with connector that you can try?

If all that checks out, there's probably a fault on the motherboard (or in the separate audio box, if present) - a failed decoupling capacitor, a dodgy soldered joint, a failing chip, something like that.
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heiowge
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Joined: Wed Feb 27, 2008 8:21 pm
Posts: 1901
Location: Cheshire, UK

PostPosted: Sat Dec 14, 2013 5:20 pm    Post subject: Reply with quote

Pretty sure they don't share a connection. I have 2 sets of headphone sockets. One is on the back near the top and is hardwired to the motherboard. The one I'm using now is on the front of the PC on a box with headphone, mic and 2 USB 2 sockets.

The mouse is plugged into a rear 4x USB 2 PCI card.

So I can't see any way they could be interfering directly... Confused
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eeepc 1015PX, 1.66 Ghz Intel atom processor, 2 GB DDR3, 320 GB hd, Mint 14 MATE. Fan needs fixing.
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guy
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Joined: Thu Apr 07, 2005 1:07 pm
Posts: 1070
Location: Worcestershire

PostPosted: Sat Dec 14, 2013 7:02 pm    Post subject: Reply with quote

By "on the front of the PC on a box", do you mean one of those toys fitted inside a spare disk drive bay?

Try these in turn, checking to see if each helps:
Step 1: Swap to the audio connector round the back.
Step 2: swap to a different USB socket, say one on the front.
Step 3: Power down, unplug from the mains, open the case and check all relevant connectors are fully home, clean and secure.

Oh and has the PC always done this or did it start suddenly one day?
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