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RE: Understand.

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

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