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XMOS-based Asynchronous USB to I2S interface
XMOS-based Asynchronous USB to I2S interface
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Old 8th May 2012, 06:14 AM   #691
soundcheck is offline soundcheck  Germany
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Quote:
Originally Posted by Wolfsin View Post

As long as there is no buffer under-run, the only cause of that being excessive DPC latency, whether the bits are pushed across USB by windows, linux, or mac is completely irrelevant.
That would be the very first interface on the market.

Your way of thinking reflects the common knowledge from at least 5 years ago.

Until today all interfaces I'm aware of fail to isolate from OS and PC induced
distortions. (assumption: bit transparent data)

There are tons of OS associated primary sources for problems. At one stage they translate into physical problems.

If Lucien would have solved that industry wide problem, he'd done a real great job.

Though. To be honest I'm not convinced about it.

BUT if more people confirm that the typical "audiophile" OS setups/players
won't show any differences (and Linux support is guaranteed) I'll place an order.
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Old 8th May 2012, 02:11 PM   #692
Wolfsin is offline Wolfsin  United States
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Default Lucien has done a great job

Quote:
Originally Posted by soundcheck View Post
If Lucien would have solved that industry wide problem, he'd done a real great job.

. . .

BUT if more people confirm that the typical "audiophile" OS setups/players
won't show any differences (and Linux support is guaranteed) I'll place an order.
Windows is the only OS that even needs a driver. Current Macs and Linux distros support Audio class 2 natively. USB 2.0 hardware is needed for higher sample rates. Please check out audiodesign's thread "USB to I2S: M2Tech vs XMOS vs Open-source Qnktc" for listening tests.

The beauty of the "Lucian Solution" is its broad applicability. Getting the full benefit, i.e. bypassing the isolator, requires external power. Even including the added jitter of the isolator it sounds VERY good. The simple message of how wonderful it is has been garbled in this thread by perfectionist musings IMO.

It is hard to 'guarantee' anything as complicated as a homebrew setup. I chose to test with a nearly ten year old version of Windows on a variety of hardware, some quite old. The DPClat program tells you everything you need to know for that platform. For Linux you might need to download the Audio Class 2 package and install it for older distros.
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Old 8th May 2012, 02:14 PM   #693
hochopeper is offline hochopeper  Australia
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@soundcheck, I don't have my i2s intput dac 100% operational yet but the 3.3.x kernels detect the card and show it in also as I would expect. Others have posted earlier in the thread with it working from linux also. One person had some problems though that was as simple as realising that alsamixer had defaulted to mute and unmuting the waveio solved the problem.
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Old 8th May 2012, 02:32 PM   #694
audiodesign is offline audiodesign  Italy
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Here the controller to get data from XMOS module and configure any DAC like AD1955, DSD1794, ES9018 ....

IR remote command for the volume and mute.
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File Type: gif ControllerSCH.gif (24.2 KB, 483 views)
File Type: gif ControllerPCB.gif (22.6 KB, 449 views)
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Old 8th May 2012, 02:34 PM   #695
hochopeper is offline hochopeper  Australia
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How does it get data from the xmos module if the xmos usb interface is already connected to a computer?
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Old 8th May 2012, 02:45 PM   #696
audiodesign is offline audiodesign  Italy
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See here

Last edited by audiodesign; 8th May 2012 at 03:14 PM.
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Old 8th May 2012, 03:02 PM   #697
Wolfsin is offline Wolfsin  United States
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Quote:
Originally Posted by hochopeper View Post
How does it get data from the xmos module if the xmos usb interface is already connected to a computer?
I think he is sensing the sample rate from WaveIO
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Old 8th May 2012, 03:11 PM   #698
hochopeper is offline hochopeper  Australia
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Latest schematic shows connection to USB header not the sample rate status header ...
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Old 8th May 2012, 03:16 PM   #699
audiodesign is offline audiodesign  Italy
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See new main schematic.


I can send microprocessor chips with custom firmware for any DAC if someone have problems to flash these.

The LCD is a 16 x 2 characters with blue background.
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Last edited by audiodesign; 8th May 2012 at 03:21 PM.
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Old 8th May 2012, 03:20 PM   #700
hochopeper is offline hochopeper  Australia
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Ah OK that makes more sense now
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