Digital Drive

Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it.

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RE: I think the concern expressed by the original poster...

Posted by Charles Hansen on June 24, 2017 at 13:36:34:
>> ASRC does not eliminate jitter, the input jitter gets encoded as "amplitude" errors in the converted signal. <<

I must admit to never having studied the underlying theory of ASRC's in great depth, simply because I've not liked the sound of any I've tried. Knewton's post just above (in Classic view) has a fair amount of technical information that seems accurate to me.

All I can say is that whatever the (real, perceived, or imagined) shortcomings of ASRC's may be, that they work well enough to fool present day measurement technology. I have performed careful comparisons with and without the ASRC, and an ASRC can easily make any DAC implementation (whether poorly or perfectly executed) and yield essentially perfect results on the JTest as used by both Stereophile and Hi-Fi News (and I believe also at least one German publication).

In my opinion ASRC's are the chief reason that one sees virtually "textbook perfect" result in many JTest measurements for the past few years, even on sub-$300 DACs. It also means that listening is even more important than ever. Before ASRC's became widely available, there used to be at least a weak correlation between the JTest measurement (which could show the quality of implementation of a DAC) and sound quality. Currently there can be an inverse correlation (in my personal opinion), as I've yet to hear an ASRC that sounds musically natural, yet they all measure essentially perfectly with the JTest.

As always, strictly my personal opinion and not necessarily that of my employer or lap dog.