I have a M-audio dio 2496 sound card connected to a tAG av32 processor via spdif.
Also have a 3com wireless pci card.

On a stereo source everything seems fine.

If the source is AC3/Dolby Digital the processor continuously drops out with the amp switching from mute to normal....If i disable the wireless card it works with no problems.

I have tried it with the optical as well as the coax feed with the same result.

be grateful of any Ideas?

Thanks

Maybe it has something to do with IRQ sharing.
Check your motherboard manual in order to know what PCI slots share the same IRQ, and move the soundcard to an unshared slot.
I didn't check for years, but some time ago, the convention was not to share the 3rd PCI slot.

This method will change the PCI hardware interrupt line but not the IRQ if you are using Windows 2000/XP where usually all PCI devices have the same IRQ by default. On older Windows machines and possibly Linux, the PCI A,B,C, and D interrupt lines are mapped to separarte IRQs so moving the card will most likely change the IRQ.

Do you have the latest drivers for the sound card and the wireless card?

Thanks for your reply's

I have a modern motherboard Intel D865GBF with latest bios.

Also have latest drivers for both cards and running win xp pro.

Both cards have an irq of 17, tried the sound card in a different slot irq stayed the same and did not improve things.


Any ideas of what else i could try?

Well there is this document which has a lot of different things to try. Some more risky than others. I don't think you want to try disabling ACPI since you have a new-ish motherboard. Sorry, can't think of anything else, besides trying another wireless card.

On Linux it depends on the system and who is allocating the IRQs. Linux respects the ACPI IRQ allocations if the BIOS made them.

If changing the sockets doesn't help, then consider looking in your BIOS settings. There should be some entries there along the lines of "PNP Operation System", "Reserve IRQ for VGA" and "Reserve IRQ for USB". On my system I get wierd crackles under Windows if "PNP Operating System" is set to "Yes".

Have you tried operating the reciever with another source while your wireless LAN card is working? It is possible that the problem has nothing to do with your PC but rather the effect of the 802.11 RF on the reciever. If it passed FCC compliance this shouldn't happen but still does.

tried changing the settings in the bios with no improvement.

used a standard dvd player on the same cable with wireless running and this worked fine also.

As a test fed a AC3 feed from sky into the soundcard then patch it out to the output of the sound card, this works fine no stuttering at all.

Just cant get any improvement at all with source from the pc which is a little frustrating to say the least.

Well i have solved the problem!!


In the wireless card srettings, there is an option "Enable Autonomous Load Balancing" which is defaulted to on, i disabled this option and now everything works!

this option connects to a stronger access point if the current signal goes low. This does not make sense as i only have one access point and the signal is steady and full strength all the time.

Thanks for your help and sugestions. Just glad to have it working.