[MLA] ISP distortion - real-world examples ?

[Kevin Gross]

Thomas has a paper on this from awhile back and he and I have previously
discussed this and I don't think we're in full agreement. I think everyone
agrees that things will get nasty if you run one of these signals through
SRC or lossy codec. We also know that some early DAC designs did not have
adequate headroom.

My discussions with DAC designers convinced me that they are now aware of
the problem and they design in enough headroom to deal with a valid digital
signal with reconstructed peak levels exceeding 0 dBFS. The rub is that
some sorts of extreme digital processing produce what could be considered
invalid signals (digital clipping being the most obvious example). Because
of aliasing, there is mathematical ambiguity as to how these signals should
be reconstructed and so designing in additional headroom for these cases
doesn't necessarily make sense.

Califorincation offers good real-world examples or you can take any
commercially released recording and give it a couple dB digital gain.

On Wed, Jun 8, 2016 at 4:18 PM, Ian Shepherd <ian at mastering-media.co.uk>
wrote:

>
> Hi All,
>
> I’ve got into a fairly lengthly discussion with Steven Slate on Facebook
> about inter-sample peaks - the next version of the Slate FG-X will detect
> these and allow the user to compensate, but Steven claims never to have
> heard real-world examples of them anyway, especially on modern DACs.
>
> I don’t have time to hunt through my collection to find him some examples,
> I was wondering if any of you can suggest examples you’ve come across that
> I can send on to him ?
>
> Ian
>
>
>
> ***
> Ian Shepherd
> Mastering Media Ltd <http://mastering-media.co.uk/> - Audio
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