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Does your HDTV support 1:1 pixel mapping?

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Old 09-21-2007, 08:21 AM   #61  
What's all this, then?...
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Join Date: Jan 2006
Posts: 6,197

Just off the top of my head and without really investigating, it sounds like the author is saying the equivalent effect in audio would alter the frequency domain and not just the amplitude domain.

Dolby and DBX modulate the gain of an audio signal in a non-linear fashion, which does affect the frequency response, but doesn't add any new frequencies or otherwise alter the frequency content. Likewise RIAA equalization, like all equalization, affects only the amplitude of the frequency components.

But, as you indicate, by applying an exact reverse gain response, the original frequency reponse is restored and the ear is perfectly happy. Sometimes "pumping" is noticable as the noise floor rises and falls with signal level (particularly on bass and drums, where there is little high-frequency content to mask the noise floor).

It almost sounds like the author is talking about listening to a signal that has been "pre-compensated" without the "post-compensation", but that's not how you use it.

It may have to do with how extreme gamma correction is compared to audio companding, along with the ears' logarithmic response and wide dynamic range compared to the eyes. Or maybe it has to do with the fact that separate gamma correction is applied to each color component (which might be the equivalent of applying gain correction to separate frequency components of an audio signal?).

Anyhow, I agree, what he's saying is not clear.

Here are some links to comparisons of efficiency of VC-1 and AVC versus MPEG2:



Interestingly, this paper indicates that because of the differences in data structure of BD versus HD DVD, you can't just take a VC-1 encode for one and use it on the other, but must re-encode. I imagine it still makes sense for neutral studios to keep the file sizes the same, even if they have to re-encode them.

BTW, that whole website is a treasure trove of info:

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Old 09-21-2007, 10:38 AM   #62  
Wii 480p looks good to me

Join Date: Jan 2007
Posts: 2,083

Oh good. I was starting to get bored here at work.

Now I have something to read. :-)
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