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USB cable quality
USB cable quality
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Old 16th September 2013, 07:07 PM   #311
marce is offline marce  United Kingdom
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USB cable quality
Quote:
Originally Posted by alan1977 View Post
This thread has amused me, its similar to HDMI cable discussions i've read
but it does get me thinking
say our cheap cable is more prone to interference, it is therefore possible in severe cases, for our 0's and 1's to become vague? but would'nt the USB interfaces pass parity information which would make the sender/receiver aware of a corrupt word, and resend the word?
So in theory the resending of the word would put an incredibly small delay into the transmission... so how woudl the recipient (DAC) deal with this delay? does it buffer to compensate fora few dropped words or bits? and therefore it would be un noticable after the DAC has worked its magic?
Even if the bits become vague they will still be read as either a 0 or 1, though bits may be dropped. This would be noticeable, not as increased noise but as drop outs. If the shielding was not up to the job you would get noise, but in either case the cable is not up to the job and should be binned.
A well engineered cable should avoid these problems, without having to resort to audiophile over priced USB cables.
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Old 16th September 2013, 08:53 PM   #312
Robert F is offline Robert F  New Zealand
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Quote:
Originally Posted by alan1977 View Post
This thread has amused me, its similar to HDMI cable discussions i've read
but it does get me thinking
say our cheap cable is more prone to interference, it is therefore possible in severe cases, for our 0's and 1's to become vague? but would'nt the USB interfaces pass parity information which would make the sender/receiver aware of a corrupt word, and resend the word?
So in theory the resending of the word would put an incredibly small delay into the transmission... so how woudl the recipient (DAC) deal with this delay? does it buffer to compensate fora few dropped words or bits? and therefore it would be un noticable after the DAC has worked its magic?
I am not sure why you would be amused...

I can't see why any cable effect would be limited to 1's and 0's. If, as you surmise, the cable is prone to interference, why would this not affect a non galvanically isolated DAC? The grounds will be polluted with the "interference".
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Old 16th September 2013, 08:57 PM   #313
SY is offline SY  United States
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USB cable quality
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Originally Posted by Robert F View Post

I can't see why any cable effect would be limited to 1's and 0's.
Because that's what it's transmitting.
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Old 16th September 2013, 09:00 PM   #314
Robert F is offline Robert F  New Zealand
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Originally Posted by SY View Post
Because that's what it's transmitting.
LOL. And nothing unintended can impinge.
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Old 16th September 2013, 09:01 PM   #315
SY is offline SY  United States
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USB cable quality
That's the beauty of digital. You transmit the bits or you don't.
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Old 16th September 2013, 09:04 PM   #316
Robert F is offline Robert F  New Zealand
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Originally Posted by SY View Post
That's the beauty of digital. You transmit the bits or you don't.
I know you aren't thick, so why limit your answers to simple first order effects, what is your purpose other than to be argumentative? If this were all there is to it there would be no need for Asynchronous protocols and galvanic isolation. Why do you suppose those were implemented? Why bother shielding USB cables either?

Last edited by Robert F; 16th September 2013 at 09:21 PM.
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Old 16th September 2013, 09:06 PM   #317
SY is offline SY  United States
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USB cable quality
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Originally Posted by Robert F View Post
..what is your purpose?
To separate fact from superstition.

Quote:
Why bother shielding USB cables either?
They radiate. This is a problem.
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Old 16th September 2013, 09:11 PM   #318
Robert F is offline Robert F  New Zealand
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Originally Posted by SY View Post
To separate fact from superstition.
Ah the fearless seeker of TRUTH strikes again. I am out of here. No need for you and I to hoe the same row others have done countless times.
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Old 16th September 2013, 09:13 PM   #319
Robert F is offline Robert F  New Zealand
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Originally Posted by SY View Post
To separate fact from superstition.



They radiate. This is a problem.
Yes it is, therefore USB cables might "make a difference". OK now I am gone:-)
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Old 16th September 2013, 10:12 PM   #320
cbdb is online now cbdb  Canada
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Quote:
Originally Posted by ClaveFremen View Post
From the link I've posted:

The USB protocol provides no error detection or recovery for Isochronous transfers. If no data is transferred or the data is corrupted, no error information is passed to the application. No retries are performed and subsequent packets of a partially failed transaction are nevertheless transferred.
No buffering is provided. If an application does not listen on an IN Isochronous endpoint, the produced data is lost. If an application must be sure to capture all isochronous data, it will have to work with at least 2 input buffers to ensure that data continues to be captured when the first buffer is full.
Why do you think this is the only way audio is transfered over USB.

USB audio - Synchronous/Asynchronous
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