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HDCDs with missing pregaps
Weeping Robot
post Jul 12 2008, 21:00
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Hey gang. I've been wracking my brain over this a bit and figured I might as well run it over by you guys over at HA.org.

Here's my situation. Basically, I used to have some disc images for albums along with the accompanying CUE files. After a while I decided I should split these up, so I used the program CueSplitter. Unfortunately, the default settings in that program do not preserve pregaps; not knowing better at the time (somehow), I looked at its options for "adding gaps" and "inverting gaps" and stupidly thought, why would I want to add gaps that aren't already part of the music? So for those albums I lost the pregap information. sad.gif

Now, here's my question. Some of these albums are HDCD, and from what I understand, HDCD relies on information at a certain frequency. Now, since the albums I split aren't exact copies of the discs (since they're missing pregaps), will this affect HDCD decoding? I'm split on this. The missing pregaps should only be silence, and thus contain no HDCD information, right? But is it that simple? Do missing pregaps still interrupt the HDCD process?

Thanks guys, hope someone knows the answer to this rather obscure question!
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greynol
post Jul 12 2008, 21:04
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QUOTE (Weeping Robot @ Jul 12 2008, 13:00) *
(since they're missing pregaps), will this affect HDCD decoding?

No.


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Weeping Robot
post Jul 16 2008, 20:46
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QUOTE (greynol @ Jul 12 2008, 16:04) *
QUOTE (Weeping Robot @ Jul 12 2008, 13:00) *
(since they're missing pregaps), will this affect HDCD decoding?

No.


Hey, thanks for the reply, and my bad for getting back so late. I guess that's a pretty cut and dry answer, right? Considering your "super mod" status it seems a pretty safe thing to me, but is there anything you could elaborate on, or did my initial post pretty much cover the reasoning?

Thanks again.
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greynol
post Jul 16 2008, 21:13
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No problem, though I wouldn't base your trust in my answer on the fact that I'm a moderator.

If you want to know about HDCD, I recommend searching the forum. HDCD doesn't rely on information at a certain frequency; it uses the LSB to provide control information used to extend dynamic range.

When people say that pregaps are missing, they usually mean the index information that marks them off are missing. Unless there's a problem with CUE Splitter, or it has been instructed to leave out the data designated as a pregap the data will still be present. HDCD doesn't care about index markers.


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Weeping Robot
post Jul 18 2008, 21:32
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QUOTE (greynol @ Jul 16 2008, 16:13) *
If you want to know about HDCD, I recommend searching the forum. HDCD doesn't rely on information at a certain frequency; it uses the LSB to provide control information used to extend dynamic range.

When people say that pregaps are missing, they usually mean the index information that marks them off are missing. Unless there's a problem with CUE Splitter, or it has been instructed to leave out the data designated as a pregap the data will still be present. HDCD doesn't care about index markers.


Yeah, unfortunately what I meant was that the actual pregap information was cut out once the disc image was split into individual files. (This was the default setting of the program, which is rather ridiculous, but I didn't know better at the time either.) So, for the affected files that I split, it's an issue of missing pregap info, not just index markers, unfortunately.

I'll look into how HDCD functions again... but in the meantime, any idea if what I said (pregaps actually missing) affects HDCD playback? Sorry to keep dragging this thread on, haha.

This post has been edited by Weeping Robot: Jul 18 2008, 21:34
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greynol
post Jul 18 2008, 21:44
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I still don't think this will affect HDCD decoding, but I'm happy you set me straight on what was actually missing.

Hopefully someone else will chime in; maybe someone involved in this thread:
http://www.hydrogenaudio.org/forums/index....showtopic=30999

This post has been edited by greynol: Jul 18 2008, 21:44


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