The Asynchronous USB Audio class 2 module. - Page 6 - diyAudio
Go Back   Home > Forums > Commercial Sector > Manufacturers > Twisted Pear

Twisted Pear Superior quality electronic kits

Reply
 
Thread Tools Search this Thread
Old 30th March 2013, 12:51 PM   #51
miero is offline miero  Czech Republic
diyAudio Member
 
Join Date: Jun 2011
Location: Prague
What will be a latency of this module? Can we expect better than 5ms?
  Reply With Quote
Old 31st March 2013, 07:36 PM   #52
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Quote:
Originally Posted by miero View Post
What will be a latency of this module? Can we expect better than 5ms?
Actually it will depend greatly on the driver. The module itself will add very little latency I wold say less than 1ms. I will try to get you a more specific answer.
__________________
Less pulp more juice Twisted Pear Audio.
  Reply With Quote
Old 3rd April 2013, 12:09 AM   #53
diyAudio Member
 
zenelectro's Avatar
 
Join Date: Sep 2009
Quote:
Originally Posted by Russ White View Post
Hi Bunpei, of course I meant you to respond privately, because I simply do not agree in many respects with the people you refer to.

I understand very well how both the XMOS and ESS I/O schemes work.

https://www.xmos.com/download/final/...ime=1362678408

With the ES9018 the effects of the 400Mhz skew on I2S would not matter as everything is asynchronously re-sampled (not merely re-clocked), but even if you are of the mind that it would matter, re-clocking each signal to the audio master clock solves this issue very nicely.

I will say that if someone credible can definitively show a direct analog effect (at the DAC output) of the 4ns jitter on anything other than a master clock on the analog audio signal (not digital) I will gladly change my view, until then that idea holds no water for me.

Cheers!
Russ
I believe Bruno looked into this, ref post below.

hypex ncore
  Reply With Quote
Old 3rd April 2013, 12:16 AM   #54
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Yes I have seen that (it is not exactly the same topic), but there is nothing there that changes my mind. And, in any case as I said everything is re-clocked to the master clock in any case.
__________________
Less pulp more juice Twisted Pear Audio.

Last edited by Russ White; 3rd April 2013 at 12:20 AM.
  Reply With Quote
Old 6th May 2013, 09:04 AM   #55
diyAudio Member
 
pietjers's Avatar
 
Join Date: Oct 2006
Am I correct that sound quality of a PC based music server will not benefit from a special USB card like the SOtM tX-USB PCI to USB Card? Or can one expect better sound quality still from such a USB card?

Peter
  Reply With Quote
Old 6th May 2013, 01:15 PM   #56
diyAudio Member
 
Join Date: Nov 2010
Dear Russ is it possible to hypothesize a release date ?
Thanks in advance
g
  Reply With Quote
Old 6th May 2013, 03:09 PM   #57
diyAudio Member
 
Join Date: Jul 2010
Default Tough...

Quote:
Originally Posted by pietjers View Post
Am I correct that sound quality of a PC based music server will not benefit from a special USB card like the SOtM tX-USB PCI to USB Card? Or can one expect better sound quality still from such a USB card?

Peter
This is a complicated question. I use an SOtM USB output card in my music server, and for further benefit, I power the SOtM USB card from a dedicated, low noise, low impedance power supply.
With a USB receiver with well implemented "isolation", the tendency would be to believe that what goes on in the server will not matter, but my experience suggests this to be untrue.
I very much suspect that even Russ' USB receiver board will benefit from using the SOtM USB card in the server (especially when powered by its own low noise supply), but until TPA releases the receiver card, and we get to try it, we will not know for sure. Russ' card does use the USB power for the XMOS processor side, so it may be an advantage to have a clean USB power supply, the SOtM card may have theoretical advantage here. In any case, I will be using my SOtM card with the TPA USB receiver to be sure I am getting the best possible performance.
  Reply With Quote
Old 6th May 2013, 07:16 PM   #58
dglow is offline dglow  United States
diyAudio Member
 
Join Date: Feb 2010
Location: San Francisco
Quote:
Originally Posted by pietjers View Post
Am I correct that sound quality of a PC based music server will not benefit from a special USB card like the SOtM tX-USB PCI to USB Card? Or can one expect better sound quality still from such a USB card?

Peter
Doesn't isolation belong at the other end of the cord?
With all due respect to Sonore, at $300 this card sets off my snake-oil detectors.
  Reply With Quote
Old 6th May 2013, 07:21 PM   #59
diyAudio Member
 
pietjers's Avatar
 
Join Date: Oct 2006
Quote:
Originally Posted by barrows View Post
This is a complicated question. I use an SOtM USB output card in my music server, and for further benefit, I power the SOtM USB card from a dedicated, low noise, low impedance power supply.
With a USB receiver with well implemented "isolation", the tendency would be to believe that what goes on in the server will not matter, but my experience suggests this to be untrue.
I very much suspect that even Russ' USB receiver board will benefit from using the SOtM USB card in the server (especially when powered by its own low noise supply), but until TPA releases the receiver card, and we get to try it, we will not know for sure. Russ' card does use the USB power for the XMOS processor side, so it may be an advantage to have a clean USB power supply, the SOtM card may have theoretical advantage here. In any case, I will be using my SOtM card with the TPA USB receiver to be sure I am getting the best possible performance.
Hi Barrows, thank you for your reply.
I am thinking in the same direction. Since power supplies in music servers do have an audible effect on sound quality, high quality USB cards with dedicated power supplies will have an audible effect too. No matter how good the USB signal is treated afterwards.
Yesterday I was at a friendís house. We put a 800VA isolation transformer with DC blocker in the mains connection of his mini mac music server. It was really surprising what an improvement that gave!
Peter
  Reply With Quote
Old 6th May 2013, 07:32 PM   #60
dglow is offline dglow  United States
diyAudio Member
 
Join Date: Feb 2010
Location: San Francisco
Quote:
Originally Posted by pietjers View Post
Hi Barrows, thank you for your reply.
I am thinking in the same direction. Since power supplies in music servers do have an audible effect on sound quality, high quality USB cards with dedicated power supplies will have an audible effect too. No matter how good the USB signal is treated afterwards.
Yesterday I was at a friend’s house. We put a 800VA isolation transformer with DC blocker in the mains connection of his mini mac music server. It was really surprising what an improvement that gave!
Peter
I wonder about this.

At this point in the data flow – that is, at the the USB port exiting the computer – we're still operating fully in the digital domain. The audio data is functionally indistinguishable from file system or network data.

If it were true that a dedicated power supply improved the robustness of digital data transfer, wouldn't we want to employ such power supplies when transferring *any* data via USB?

I have a digital file that includes sensitive financial data. And yet, I don't think twice about relying on my computer's power supply when backing up said file to an external hard drive.

How is audio data any different?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Asynchronous USB DAC clock source Hitec Digital Line Level 7 12th April 2014 08:41 PM
LPC3130 for asynchronous USB to I2S jonsmirl Digital Line Level 16 11th November 2012 01:12 AM
USB asynchronous output to to DUEL AES jsa_ind PC Based 1 26th April 2012 03:49 PM
Cheap Asynchronous USB jkeny Digital Line Level 5 26th September 2009 11:24 AM
Cad Audio - another Class-D module raintalk Class D 0 9th November 2004 10:09 PM


New To Site? Need Help?

All times are GMT. The time now is 11:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2