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In Reply to: Re: More on Async and why it may never work again... posted by ThomasPf on September 25, 2006 at 09:30:55:
Thomas,I know how it works I wrote the driver. Sometimes the pc does not respond fast enough and that is when there is a dropped sample.
The TAS1020 has limited space for buffering which worked on most PC's but some that have say one 1.1 host controller and then internal crappy hubs seem to be the ones that just can't keep up.
Why not test the 2 you mentioned the way I am and see if they don't miss a sample. It's pretty easy to do since it is a closed system.
Follow Ups:
Hi Gordon, I am by no means an expert on system programming but doesn't it almost sound like a latency issue ?
Maybe MAC OS and/or USB2.0 do not run into that bottleneck (?)
Btw if you are striving to make it work for v1.1 then IMHO for all practical purposes you could forget about usb v1.1. If you could roll out a "USB 2.0 only" DAC I am sure that would not be a problem at all!
Secondly, I just wanted to throw this out there. I wonder where does PCI-> I²S fit in here ? Say if there was a internal pci soundcard that had I²S output capability then how good would that be as compared what we are trying to achieve with usb and firewire.
PM,I think that actually the problem may have been that the computer misses a request for data and that screws it up. I think and sent the info onto Thomas that I feel the makers of hardware are not including premium USB drivers for their hardware. Or in the other case they have a single 2.0 complient host controller and crap it up with a poorly integrated 1.1 hub. I think that is the case with the HUSH mini ITX I have.
There is no USB Audio 2.0 specification so that is out of the question. Nor can you tell people that it is what they have to have.
But really the point is what is the best sonics you can get. Is Async really better sounding that standard ISO? No not really...
As for I2S there is no spec here so don't expect an PCI card. Actually I don't even like the idea of dragging the clock, data and word clock on a cable. First it would require a secondardy pll & vcxo on the receiver side and then reclock all the lines. AHHHHH really it's a waste of time.
Gordon,I'm assuming you went into the BIOS of your motherboard and turned off usb Legacy support?
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