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RE: Is DoP true DSD?

Posted by Thorsten (M) on February 7, 2014 at 11:31:36

In Reply to: RE: Is DoP true DSD? posted by Tony Lauck on February 7, 2014 at 10:52:34:

Tony,

> What is this licensed Steinberg technology? As far as I can
> see ASIO is just a software interface. I would be surprised
> if there were any real intellectual property beneath it other
> than a trademark.

Well,simply speaking,the full documentation is not in the public domain, last time I looked.

> There may be software implementations subject to Copyright,
> but these can easily be rewritten.

Be my guest. Reverse engineer the stuff and write a new open source compatible version that can use any UAC2 interface . And document the hardware side implementation.

Other than that I do not disagree.

> DoP is, at best a "neat hack".

Cannot argue that. But it is a very clever hack nevertheless.

> DOP has its problems, mostly relating to the use of "in band"
> control channel signalling. It is difficult enough to achieve
> a smooth transition in a DAC between PCM playback and DSD playback
> (because of the inability of DSD to easily represent DC) without
> creating all kinds of problems in a pipelined system involving
> the file, application program, interface wrapper, device driver,
> hardware interface, interconnect protocol encoder, interconnect
> protocol decoder, synchronizer, and multi-mode DAC chip.

Well, I have not looked at the theory. In practice DoP is surprisingly straight forward. It has a tendency for DC glitches on track change - but that would be the same using any DSD signal, cannot blame that on DoP. Adjust your muting timing me sez...

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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