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Thanks for the explanation

When I first heard about a USB (or Firewire, for that matter) DAC (or s/pdif converter) I thought the idea was a good one. My assumption was that the data would be streamed into a large buffer on the receiving end, then output with very precise timing (controlled by a fancy clock that was powered in a very clean, un-computer-like way) to a DAC (or directly to the DAC chip that was in the device itself). The assumption was that this buffering would make all talk of jitter (related to the sending and receiving ends of the USB connection) irrelevant. I imagined it was something like how a hard drive must work...you send it data, but it has to buffer it so that it can write it, with very precise timing involved, to that platter that is rotating at very high speeds.

Why don't any of the USB solutions I've heard discussed implement an approach like this?

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