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AV and Multimedia Related Thread, Weird computer audio coming through speakers in Technical; Hello, I've experienced this before but can't remember why it happens. We have a laptop here in school and the ...
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    marsdenprimary's Avatar
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    Weird computer audio coming through speakers

    Hello,

    I've experienced this before but can't remember why it happens. We have a laptop here in school and the audio is terrible through the speaker system. Plug it into the amp and the volume is very low but when you turn it up you can hear the sound of what sounds like a Spectrum 48K loading a game! Every time you move the mouse- it makes a zzzrzrzrz sound. If you jiggle the jack output it can get a little louder but still awful. Any ideas?! The laptop is a Toshiba.

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    Steve21's Avatar
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    Sounds like a grouding loop. You tried a humbugger in line?

    Steve

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    marsdenprimary (25th November 2013)

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    DaveP's Avatar
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    Or is it feedback? Do you have a built-in microphone on the laptop? If 'yes' have you tried muting the input from the mic to see if the noise disappears?

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    marsdenprimary's Avatar
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    Quote Originally Posted by Steve21 View Post
    Sounds like a grouding loop. You tried a humbugger in line?

    Steve
    Haven't got a clue what that is!

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    twin--turbo's Avatar
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    Sounds like a ground loop as sugested. If you have a laptop PSU with a 2 pin rather than 3 pin lead then try that.

    Rob

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    marsdenprimary (25th November 2013)

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    marsdenprimary's Avatar
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    Quote Originally Posted by DaveP View Post
    Or is it feedback? Do you have a built-in microphone on the laptop? If 'yes' have you tried muting the input from the mic to see if the noise disappears?
    Definitely not feedback as I have experienced that before.

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    marsdenprimary's Avatar
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    I'll see if i've got one but i don't think we have...

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    Quote Originally Posted by marsdenprimary View Post
    I'll see if i've got one but i don't think we have...
    Unplug it from the power while in use.

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    marsdenprimary's Avatar
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    Quote Originally Posted by j17sparky View Post
    Unplug it from the power while in use.
    Haha! A beautifully perfect solution. Now...if only it wasn't a Primary school teacher we were asking to do this...

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    FishCustard's Avatar
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    Quote Originally Posted by marsdenprimary View Post
    Haven't got a clue what that is!
    Probably a ferrite choke or bead.

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    marsdenprimary's Avatar
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    Another thing that happens is when you unplug the power from the laptop it just buzzes very loudly as though the audio jack is faulty...but when the power is plugged in no buzzing but we have the computer interference noise...

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    Take a look at Ground Loop Isolator 3.5mm variety. We find it happens a lot when lengths of cable are long, or it's near other things that intefere with the signals.

    They are fairly cheap to get, and make a lot of difference we find. But it's only a guess with yours

    Steve

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    marsdenprimary (26th November 2013)

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    Quote Originally Posted by Steve21 View Post
    Take a look at Ground Loop Isolator 3.5mm variety. We find it happens a lot when lengths of cable are long, or it's near other things that intefere with the signals.

    They are fairly cheap to get, and make a lot of difference we find. But it's only a guess with yours

    Steve
    Cheers Steve i will see if i can buy one and let you know

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    Andie's Avatar
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    Did the ground loop isolator help the issue? We're also getting this, although it disappears when the power is unplugged from the laptop (as suggested above). Worst offenders seem to be Samsung laptops, but also some noise when using HP and Toshiba.

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    Quote Originally Posted by Andie View Post
    Did the ground loop isolator help the issue? We're also getting this, although it disappears when the power is unplugged from the laptop (as suggested above). Worst offenders seem to be Samsung laptops, but also some noise when using HP and Toshiba.
    Sorry for the late response! In the end I swapped the amp that the laptop was going into and it sorted the problem out so I never had an opportunity to test a ground loop isolator.

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