Buzzing noise caused by bright information on screen

[acem77]

Buzzing noise caused by bright information on screen.
I have 2 systems that do this the most my turbo duo and neo-geo aes.
these are booth hooked up via RGB.
any time the video outputs an over all bright scene the buzzing become more noticeable.
the brighter the louder the buzzing.
are there any common tricks/components to limit the buzzing produced over the video lines to the sound lines.
i have over 10 systems hooked up to two  selector boxes that goes in to my xrgb2 plus.
the vga video and stereo sound then goes to my TV. then a line out from my TV goes to my audio receiver.
i have tried various grounding tricks but have had no luck.

[NeWmAn]

turbo duo and neo-geo aes.

Have you tried taking the audio from the headphone sockets?

[acem77]

i am using the stereo jack on the neo-geo. have not tried the duo.
if hook up the duos composite stereo cable to any random input on my stereo receiver while still using the RGB and the stereo lines i added the buzz is dampened.
something to do with an odd ground loop ....

[viletim]

It's probably the fault of the crappy cables you're using. Either try to get a better cable (easier said than done) or fix the one you've got. A couple of things you can do to improve the cable are:

- Add some more/thicker ground wires.
- Seperate the audio from the video signal. Break into the cable near the console end, find the audio+ground wires, cut and solder them to a proper sheilded (twin?) phono lead.