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  1. #1
    Junior Member
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    Exclamation C-Media AC97 Scratchy Static Sound

    Just yesterday, the sound coming through my desktop speakers, computer, and headphones has a lot of static in the audio. I've troubleshot through the device mgr, adjusted volume, updated the drivers, etc. and I know it's got to be a problem with the sound card. I have googled to find what to do, and I'm not coming up with anything.
    I appreciate anyone's immediate assistance. Please!
    Thank you,

    DJPassion

  2. #2
    Human voltmeter DanU's Avatar
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    Try muting all unused inputs, like mic-in, line-in, aux-in ,etc.

  3. #3
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    Static Sound Still Persisting

    I tried muting everything possible and there's still static. Any other ideas?
    Thanks for your assistance.

  4. #4
    Ultimate Member
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    There might be something else in the system that's eating I/O bandwidth, or blocking things too long for the sound engine to get a contiguous data stream.

    In particular, high-bandwidth peripherals on the slow PCI bus may disturb realtime streams like audio and video.

  5. #5
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    That worked!

    Peter M,
    That was the trick! When you said that, I remembered that I had connected a new Logitech video/web cam to my computer (which I haven't used yet), and when I disconnected it, the sound was crystal clear!
    Thank you so very much! And, thanks to DanU for your comments, too!

    All my best,
    DJPassion

  6. #6
    Member krotch's Avatar
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    wow, a webcam was eating all the bus bandwidth, that must be one hi res webcam

  7. #7
    Human voltmeter DanU's Avatar
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    It might have been a combination of things, with the web cam just being "the straw that broke the camel's back".

    Good to hear you got it fixed... oh yeah and welcome to Techimo!

  8. #8
    Junior Member
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    C-Media Scratchy Sounds

    C-Media embedded chip (and other sound card) scratchy sounds are due to a very old chip problem, the chip acting as a wideband Amplitude Modulation radio receiver. First experienced about thirty years ago with Fairchild and then National Semiconductor chips it's where a high impedance stage has a diode nearby to act as a detector, picking up signals from within the PC or from household appliances which accounts for their seemingly random nature or 'scratchiness'.
    More obvious sounds can come from items like a ticking electronic clock.
    Until C-Media chip and MoBo designers wake up to the problem and include radio frequency grounding circuitry in their designs, driver downloads are unlikely to cure this problem.
    When using an Asrock P4i65G MoBo, the problem has been finally cured by over-riding Intel shared video by installing an AGP graphics card, so it was a 'video on sound' rather than a 'sound on video' problem.
    Last edited by Bruce R; July 30th, 2007 at 12:16 AM. Reason: Late Update After More Work

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