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RE: The importance of USB cable quality in HiFi

Posted by audioengr (M) on January 29, 2015 at 18:59:15

In Reply to: The importance of USB cable quality in HiFi posted by GeorgeG on January 27, 2015 at 10:08:35:

Buffering an entire file requires a lot of memory, and if its buffered, you will likely lose the ability to pause, fast-forward and reverse etc..

We get the same benefit with the Async USB protocol, by buffering a smaller amount and controlling the flow from the source (pull) based on a local clock. A backchannel is used to regulate the flow of data, preventing memory buffer overflow and allowing the local clock to spool the data out.

With Async, the jitter in the signal on the cable is not important. Jitter at the receiver is still impacted by the USB cable however. This occurs due to common-mode noise on the USB cable. USB filters and galvanic isolation of grounds minimizes this noise.

It is alsopossible to get errors on the USB cable, depending on the USB receiver and termination. A better quality cable can reduce losses and improve bandwidth, reducing errors.

Edits: 01/29/15

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