RFI from Gfx card affect sound?

Yomat · Aug 29, 2003, 06:19 AM

Hello.

If I am writing nonsense below. Please be kind to me. I'm just trying to learn.

Firstly generally. There are some cases where ppl reports that they get noise in speakers when scrolling, moving windows etc. Could that be because of RFI emissions from graphics card?

In relation to that. Suppose I did this modification to my graphics card:
http://www.geocities.com/porotuner/imagequality.html
Could this modification increase the possibility of interference? Or is that a whole other deal that has to do with totally different frequencies? And how would that work. Is it something that is generated by the gfxcard itself.. or by the monitor when the signal is used by it?

If emissions are a problem, is there any modification one can make to protect ones soundcard from emissions? Like a metal, enclosing box or something?

evil_one · Aug 29, 2003, 11:25 PM

Noise when the screen gets busy is most likely do to PCI bus hogging/IRQ conflicts. Change PCI slot, install latest motherboard drivers, perhaps update motherboard BIOS.

Rayder · Aug 30, 2003, 12:45 AM

My bro says that running the speaker's cords parallel with power cords can cause noise too. If you MUST have the speaker cords around power cords, have them cross each other, not run parallel. He's into building electronic gadgets, so he should know.

Yomat · Aug 30, 2003, 11:41 PM

Quote:

Originally posted by Rayder
My bro says that running the speaker's cords parallel with power cords can cause noise too. If you MUST have the speaker cords around power cords, have them cross each other, not run parallel. He's into building electronic gadgets, so he should know.

Ah. But does he have an opinion if removing that filter on a graphics card could cause any problems? Like problems with the monitor or the analog sound quality from the soundcard.

Yomat · Sep 2, 2003, 02:24 AM

I did some research myself. It appears that some gfx cards while back didnt have them filters. They just send ferrite cores (beads) with the gfx card to put on the monitor cable. This would absorb the higher frequency signals that can escape the cable, even a shielded cable.

My 'professional' monitor has a cable that is already equipped with them 'lumps' in both ends. And for those of you that doesent have them lumps can always buy clip-on ferrite cores and put on both ends of the cable. Think this might be important for analog musicians. Minimize the risk of RFI disturbing some equipment. This only apply if you have an older graphics card. With newer you get both bad image quality and little emission.

Aug 29, 2003, 06:19 AM	#1
Yomat DriverHeaven Newbie Join Date: Aug 2003 Posts: 8 Rep Power: 0	RFI from Gfx card affect sound? Hello. If I am writing nonsense below. Please be kind to me. I'm just trying to learn. Firstly generally. There are some cases where ppl reports that they get noise in speakers when scrolling, moving windows etc. Could that be because of RFI emissions from graphics card? In relation to that. Suppose I did this modification to my graphics card: http://www.geocities.com/porotuner/imagequality.html Could this modification increase the possibility of interference? Or is that a whole other deal that has to do with totally different frequencies? And how would that work. Is it something that is generated by the gfxcard itself.. or by the monitor when the signal is used by it? If emissions are a problem, is there any modification one can make to protect ones soundcard from emissions? Like a metal, enclosing box or something?

Aug 29, 2003, 11:25 PM	#2
evil_one DriverHeaven Lover Join Date: Nov 2002 Posts: 109 Rep Power: 0	Noise when the screen gets busy is most likely do to PCI bus hogging/IRQ conflicts. Change PCI slot, install latest motherboard drivers, perhaps update motherboard BIOS.

Aug 30, 2003, 12:45 AM	#3
Rayder Mostly lurking lately.... Join Date: Jun 2002 Location: U.S.A. Posts: 2,160 Rep Power: 71	My bro says that running the speaker's cords parallel with power cords can cause noise too. If you MUST have the speaker cords around power cords, have them cross each other, not run parallel. He's into building electronic gadgets, so he should know.

Sep 2, 2003, 02:24 AM	Thread Starter #5
Yomat DriverHeaven Newbie Join Date: Aug 2003 Posts: 8 Rep Power: 0	I did some research myself. It appears that some gfx cards while back didnt have them filters. They just send ferrite cores (beads) with the gfx card to put on the monitor cable. This would absorb the higher frequency signals that can escape the cable, even a shielded cable. My 'professional' monitor has a cable that is already equipped with them 'lumps' in both ends. And for those of you that doesent have them lumps can always buy clip-on ferrite cores and put on both ends of the cable. Think this might be important for analog musicians. Minimize the risk of RFI disturbing some equipment. This only apply if you have an older graphics card. With newer you get both bad image quality and little emission.