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Thread: audio input causing video noise

  1. #1
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    Jan 2009
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    audio input causing video noise

    i have factory bose system, pxamg (ipod / aux input interface that connects to stock system) car pc with usb soundblaster for audio, xbox360...

    my question is: as soon as i plug the audio from xbox360 to the input, the monitors get video noise

    any ideas??

  2. #2
    FLAC
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    Ground loop. Its the same thing as audio paths. Try grounding the chassis of the XBox 360 to the carPC
    Take my advice: Do not try to build a system that includes EVERY feature. Start with the basics, build it to a bug free state, and THEN add on.

  3. #3
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    thanks for suggestion

    Quote Originally Posted by Will Albers View Post
    Ground loop. Its the same thing as audio paths. Try grounding the chassis of the XBox 360 to the carPC
    thanks i'll give that a try, i also thot about getting the digital av cable for the 360 to go out from 360 into digital usb soundblaster, do u think this would b less likely to cause video noise?

    im still kicking around ideals to power the xbox 360, inverter was horrible so thats out, i did a test with ac power from house, was crystal clear as long as i didnt plug the audio from the 360 to the inputs of the usb soundblaster or the pxamg interface, so far these are my options:

    1. cut 360 cord open to run 12v wires straight to 12v car, ground to ground and 5v to the 5v output of my mo-so-co case it has the m2-atx, wires are color codded http://krisbox.free.fr/atxto360.GIF i got this idea from people using atx psu's to power their 360's, my question here is 12v is 12v right? meaning 12v from a/c powered atx psu is the same as 12v from car battery?

    2. ive got a PSU Energyzer for Xbox 360 on the way so i could hook it up to the m4-atx (which i orriginally ordered to power a pci video card on my atom)

    in both cases i should be able to ground to the same ground as car pc

  4. #4
    FLAC
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    Quote Originally Posted by wayda View Post
    thanks i'll give that a try, i also thot about getting the digital av cable for the 360 to go out from 360 into digital usb soundblaster, do u think this would b less likely to cause video noise?
    Nope, that cable is only for audio. There are hdmi inputs video capture boxes that would allow the 360 to display in the PC, and then PC to monitor. It will add $$ and complexity. I'm not sure I would recommend it.

    Try to get the system working with the basic analog connections (like you are using now). Its the simplest to trouble shoot.

    Quote Originally Posted by wayda View Post
    im still kicking around ideals to power the xbox 360, inverter was horrible so thats out, i did a test with ac power from house, was crystal clear as long as i didnt plug the audio from the 360 to the inputs of the usb soundblaster or the pxamg interface, so far these are my options:
    Dont give up on the inverter. Its inefficient, sure, but works. Ground the inverter CASE to the same point as the xbox CASE to the same point as the PC CASE.

    Quote Originally Posted by wayda View Post
    1. cut 360 cord open to run 12v wires straight to 12v car, ground to ground and 5v to the 5v output of my mo-so-co case it has the m2-atx, wires are color codded http://krisbox.free.fr/atxto360.GIF i got this idea from people using atx psu's to power their 360's, my question here is 12v is 12v right? meaning 12v from a/c powered atx psu is the same as 12v from car battery?
    the xbox is a PC. I'm not sure the m2-atx power supply has enough juice. I'm not a pro here. I know a carnetix box would do it. 12v is 12v BUT to its own circuit. You cannot use the 12v from the output of the atx power supply and ground it to the chassis of the car. You have to ground it to "ground" of the power supply.

    Don't they make a 12v adapter for the xbox?
    Quote Originally Posted by wayda View Post

    2. ive got a PSU Energyzer for Xbox 360 on the way so i could hook it up to the m4-atx (which i orriginally ordered to power a pci video card on my atom)

    in both cases i should be able to ground to the same ground as car pc
    Remember, if you are on the OUTPUT side of a PSU, the ground and 12v are designed to be independent from the car. They are regulated and insulated from noise. You cannot use multiple PSUs to power the same circuit either. If you are talking about the power INPUT of the PSUs, you use the car 12v and ground. They can, and should, be grounded to the same point.

    Hope that makes sense.

    (I have said "cannot" and "can't" in places that are not absolutes, but stated that way to help conceptualize. You can do anything if you throw enough money and design into it. Sometimes its better to stay within guidelines to help cover the basics)
    Take my advice: Do not try to build a system that includes EVERY feature. Start with the basics, build it to a bug free state, and THEN add on.

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