[filmscanners] Re: Dynamic range

["Todd Flashner" <tflash@earthlink.net>]

on 9/2/02 3:03 AM, Julian Robinson wrote:

> But ignoring valid points is precisely
> what you do, and if you disagree I will happily repost many items you have
> never answered.  Would you like me to do that?

Julian

I kinda would. I'd like to see exactly where you each stand at this point.

Or, you wrote elsewhere that you were thinking to drop the discussion.
Before you do, I wonder if you could briefly summarize what you feel the
differences remain between yourself and Austin on this issue (technical, not
personal, differences ;-)

For instance, one day I saw these two snippets:

Julian:
This ratio calculation will give you the dynamic range AND the resolution
in this case.  (But don't forget, this does not mean that dynamic range is
the same thing as the resolution!!!)

vs

Austin:
Now, because I say that it gives me resolution information, does not mean
that it doesn't also give other information, like "size".

So is this just semantics at this point: (a range with a resolution) vs (a
resolution with a range) or are there differences in how you'd each approach
the equation? My sense is that now that you are clear on how Austin views
the relationship between noise and MDS, you'd each handle that the same. So,
the main difference is whether the numerator (Peak Level, Max Signal) is a
range or one value? Is there a standard definition of these terms somewhere?
Why is there sooo much debate over what appears to a layman's eyes to be
simple electrical terminology?

There was one chart I quoted that seemed to indicate Analog Devices
considered Peak Level to be a single value, and the range between noise and
distortion to be DyR, but Austin made the point that if they were showing
DyR to be a range then they were also showing SNR and Headroom to be a
range, which Austin says they are not.

So, long story short, before this thread fizzles to fester, where are we at?

Thanks,
Todd

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