Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

PC Based Computer music servers, crossovers, and equalization

USB cable quality
USB cable quality
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th February 2016, 09:30 PM   #481
phofman is offline phofman  Czech Republic
diyAudio Member
 
Join Date: Apr 2005
Location: Pilsen
Quote:
Originally Posted by turbodawg View Post
As far as data corruption............in optimal conditions, test shows there is usually almost none. But I'd be willing to bet there are many ways you can corrupt USB data a little or a lot, and still have it come out as music. For example read this:

http://www.usb.org/developers/docs/d...cs/frmts10.pdf
I do not see any error correction mechanism in those specifications. A flipped bit will produce audible click or ever ruin the whole frame if in the frame header. Where is the potential for the little yet reoccuring corruption? The LSB can be flipped randomly, but next time it will be a more significant one - thus a click.
  Reply With Quote
Old 12th February 2016, 08:07 AM   #482
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
USB cable quality
Bits are not just bit though, its the bits between bits that we have to worry about, these anti-bits (only recently discovered as a by product of research at CERN into Antimatter) are the cause for concern, they are a fleeting phenomena that seemingly only appear in digital audio, where they can randomly change to normal bits, but only in a position in a packet of data that corresponds to actual music, rendering control bits unchanged. This is why we get these minor changes in digital audio reproduction and no where else where digital data transmission is involved. A white paper is due early March written by one of CERN's German female physicists Prof. Legsanbrains.








  Reply With Quote
Old 12th February 2016, 08:08 AM   #483
marce is offline marce  United Kingdom
diyAudio Member
 
Join Date: Jun 2007
Location: Blackburn, Lancs
USB cable quality
Regarding ferrite's and sound change any proof or just anecdotal evidence, gained from sighted listening......
  Reply With Quote
Old 12th February 2016, 01:32 PM   #484
turbodawg is offline turbodawg
diyAudio Member
 
Join Date: Feb 2004
Quote:
Originally Posted by marce View Post
Regarding ferrite's and sound change any proof or just anecdotal evidence, gained from sighted listening......
Sighted A/B listening, comparing 1 minute segments of music, repeatedly. It's a pretty clear difference. I have a good ear, it's enough to convince me.

I think the ferrite is knocking down EMI/RFI hash in the USB power supply line (and possibly the data line too), which is probably not changing the actual data, but is getting into the power and/or signal paths of the dac and causing distortion. Without the ferrite, everything has a bit more sizzle and harshness, which can be good at lower volumes, but fatiguing at higher volumes. I'm personally very sensitive to distortion.

Last edited by turbodawg; 12th February 2016 at 01:37 PM.
  Reply With Quote
Old 12th February 2016, 01:48 PM   #485
turbodawg is offline turbodawg
diyAudio Member
 
Join Date: Feb 2004
Quote:
Originally Posted by phofman View Post
I do not see any error correction mechanism in those specifications. A flipped bit will produce audible click or ever ruin the whole frame if in the frame header. Where is the potential for the little yet reoccuring corruption? The LSB can be flipped randomly, but next time it will be a more significant one - thus a click.
I'm still trying to read more about it. While it's clear there's no feedback type of error correction in the USB data transmission, I'm curious how much data correction is done in a USB DAC, either onboard the USB chip itself or in the DAC chip. Optical disc formats use plenty of error correction, but it's not a feedback type.

Here's a discussion of the errors due to inherent physical flaws in optical discs. Make me think of the practice of using markers on the edge of CD's to reduce stray light...I've never tried it, but this makes it sound more plausible.

http://debenedictis.org/erik/Reports-1981/EC-PCM.pdf

Last edited by turbodawg; 12th February 2016 at 01:52 PM.
  Reply With Quote

Reply


USB cable qualityHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to isolate USB instrument from interference conducted by the USB cable sunkai Parts 3 25th April 2014 02:19 PM
USB Cable sergedc Digital Source 3 23rd April 2012 11:44 AM
Will wireless USB hub lower the quality of my USB sound card output? rg12 Digital Source 6 6th January 2011 08:47 PM
USB DAC (in the cable!?) rjm Digital Source 5 13th May 2004 08:19 AM


New To Site? Need Help?

All times are GMT. The time now is 02:09 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki