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In Reply to: RE: One Comment, Two Questions posted by Jim F. on February 09, 2009 at 16:28:14
But it's never been clear to me that the D/A filter also changed. There is absolutely no hint of any such thing happening in spec sheets for either the PMD-100 or the PMD-200.
And when you read the white papers, they *very* carefully dance around this issue.
I would love to hear from Keith Johnson and put this issue to rest for once and all.
Follow Ups:
I wrote for the fun my own HDCD software decoder.
I could tell you, that on the few HDCD encoded disk I tried (essentialy Neil Young ones), there is what appears to be switching filter commands but
only between 2 filters.
The "alternate" filter seems to be used on high frequency contents.
I could give you more precise example if you want....
It doesn't means that PMD-x00 chip do something with these commands.
and it's true that PMD spec sheets don't tell too much.
PCM1732 spec don't tell really more , but a least it shows a link between HDCD decoding and digital filter....
Killer project!
I saw some other forums that mentioned a project like this, was this your decoder or are there two smart people out there with that much time on their hands?
I'm not sure how you would know that the commands being sent are to change the filter, as opposed to the other parameters that can be changed.
This might be better to take off-line, so please e-mail me at "chansen at ayre dot you-know-what" and be sure to put the word "Ayre" somewhere in the subject line of your first e-mail so that it gets past my spam filter. After that I can add you to the "approved list".
> I saw some other forums that mentioned a project like this, was this your > decoder or are there two smart people out there with that much time on > their hands?
No the same one
> I'm not sure how you would know that the commands being sent are to change > the filter, as opposed to the other parameters that can be changed.
You have a mail
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