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In Reply to: RE: Understand. posted by Bob_C on August 30, 2014 at 18:58:49
If there are data errors on a USB cable, then sooner or later they will be audible if you listen carefully. You might not hear each individual data error, but if 10 occur a careful listener will likely notice at least one problem.
The sound of a USB error will depend on the particular music being played ant the particular algorithms in the DAC that respond to the error indication. The situation is more complex with USB errors than it is with SPDIF errors. SPDIF errors will be audible when they happen to hit high order bits of a PCM word, particularly if the music is quiet at that point. Because of the design of SPDIF there is no way the DAC can detect an error and perform muting, hence there will be clicks. In the case of USB errors the DAC will definitely be able to detect data errors, but a single bit error will affect not just one audio sample, but potentially all the data left in the remainder of a 1 msec block of audio.
There should be no data errors on USB audio. They should be at the level of people being killed by errant meteors. If there are errors the likelihood is that some piece of equipment is broken or that some fool paid big bucks for an expensive cable "designed" by an idiot who didn't know what he was doing.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Follow Ups:
There should be no data errors on USB audio. They should be at the level of people being killed by errant meteors. If there are errors the likelihood is that some piece of equipment is broken or that some fool paid big bucks for an expensive cable "designed" by an idiot who didn't know what he was doing.
Thanks Tony. Yet at least one inmate has reported USB errors which by your comments would be a good indication that his equipment or cable is broken. It wouldn't make sense at that point to pursue other audio tweaks if the fundamental functionality of his USB interface is flawed.
I'd still be curious to know if anyone has observed these 'hard errors' using software or test equipment while listening for them, perhaps against a continuous tone to make them easier to hear.
He reported USB errors, but it may have been the result of a bug in the error counting software. I can get reported USB errors from my USBPAL driver if I try running with 8 msec buffers and none with 4 msec buffers. Also, there are a horrendous number of them even if no audio application is running. With either buffer size audio seems to play without obvious glitches.
If I load my system up heavily then sometimes another error "ASIO errors" will get counted. This is particularly true when I do room correction of a DSD file as CPU load gets to 75 percent (all cores). When these happen usually errors show up in pairs and they are usually audible. Typically, something like using the scroll wheel on the mouse while looking at a complex web page will provoke these errors. These errors mean that the application is not supplying buffers to the driver fast enough.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Thank you so much Tony (Saint Anthony) . You have much more patients than I do...
I'm not too pretentious - if all good ones are already taken, I'll be happy with something less traditional.
How about St. Baal?
nt
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