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In Reply to: RE: USB cable errors - NOT posted by AbeCollins on August 25, 2014 at 19:36:59:
"If I'm not mistaken, a couple others tried testing for USB errors, possibly Tony."
Correct, I have always counted the errors when possible. As a matter of principle, when ever I get a new piece of hardware or software I try to break it, or otherwise test its limits, unless the nature of the product is such that it might be permanently damaged. I have seen all the reported errors for my playback chain, those reported by HQplayer and those reported by the USBPAL device driver for my Mytek. However, from the Mytek documentation it was not exactly clear what the cause was for USB errors. I generate all the underrun errors by load testing the PC with non-audio tasks. Among other benefits this vets that the error counters do actually count...
Note that USB data errors will be detected by the CRC and the resulting frame dropped. Thus the audible effect of USB data errors is likely to be similar from the audible effect of buffer underruns where only a single buffer is dropped. (This is different from what one hears if there are data errors on an SPDIF connection where there will be audible clicks if they hit a high order bit at a time when the music is quiet.)
With the Mytek firmware and driver I have noted that using smaller buffers increases the chance of various error counters counting, but decreases the audible effects when they occur, such that often they are inaudible. When grossly overloading the computer and getting underrun errors with large buffers the sonic glitches will be obvious.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: USB cable errors - NOT - Tony Lauck 08/25/1420:41:53 08/25/14 (0)
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