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In Reply to: Re: New USB/Spdif interface posted by ThomasPf on September 12, 2006 at 19:07:24:
thanks to clarify...
for newbies.
Follow Ups:
You can build a good USB Audio converters both ways.
However, for the highest possible quality you will want the master clock to be in the DAC.
Thomas,After doing testing for like 2 months having the master clock in the dac is not the answer.
The problem with async is that now you are so dependent on the following items:
1) Host Operating system.
2) Host USB Controller
3) USB controller port structure.... (i.e. single output to internal hub as compared to multiple direct connections).
4) Other USB devices on the chain.
5) Speed of the host processor.
6) Device layer driversI have 3 computers with XP on them and only one can deliver Async without burping and that is with custom drivers. I have 5 MAC machines and they work better but still not as good as in ISO mode again with custom drivers.
In general ISO has the highest priority of any device on the chain. Therefore the best thing to do is just make sure the dac side of things does it's best to provide a stable low jitter system on it's end.
Thanks
Gordon
Have you tried the built-in driver in XP and the updated verison in Vista?I have seen it work pretty well on all my machines. At least better than all other USB audio schemes.
The audio data delivery is still using an isochronous channel in async mode but you have an additional isochronous back channel that regulates the flow. This scheme reduces the likelhood of crackling and makes it more resistant to other devices on the same controller.
Your custom driver might be the problem. Try a Creative 2NX and don't install the custom river to play around with this.
Cheers
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