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In the Forum: Didital Things
In the Thread: A CD off tune? The Big CD Conspiracy theory?
Post Subject: High Resolution and 16 bitPosted by tuga on: 8/26/2009
 Axel wrote:
is what I assume that your CD's source is all about. So it could be in deed a problem having used the 'original' master tape (analogue) which might have had a slight problem, stretched, or issues with the equipment speed (slight speed wobble) when the a new digital conversion for the new digital master was carried out.

I have the odd 'Original-Image Bit-Processing' Digital Recording DG CD -- BUT this would not be susceptible to what could be the case with an analogue master of what you are relating.
However, those digital recordings have their own problems with a stupidly over-done 'treble-resolution' so it may sound 'marvellous' on some rubbish plastic boom-box. Since so many people have bough such cheap crap audio over the last 10-15 years, it might just be that DG thought they have to suit the prevailing market 'requirements'.
You would know if my notion on this 'wanting' re-mastering is correct, ALL of these CDs would show the same problem. So, if someone of your site-posters has it as well, he then might be able to confirm that it's a re-mastering issue and not your own 'audio processor' having gone coo-coo.


Having repeatedly been impressed by Japanese mastered CDs (Denon, Toshiba, etc.) I came to believe that it might have something to do with the fact that these had been processed with pre-emphasis, so it's funny that you mention DG's Original-Image Bit-Processing/4D recording as this seems to use a similar process (here's a very basic ).
Pre-emphasis has a catch (small, due to the reduced number of CDs with such process) though since, as with the RIAA equalization, we are very much dependent on our player's ability to process the de-emphasis.

Could it be that manufacturers are no longer using a de-emphasis circuit both due to the minute number of copies and also to the fact that this process is (almost) no longer used?

In any case, I try whenever possible to buy the original CD mastering for fear of dynamic compression, reduced quality (many new "remastered" releases have extras and these take MB space) and fear of brutal Sci-Fi process such as AMSI - Ambient Surround Imaging:

"We don't just record original material in 5.1 Surround Sound at 48 or 96 kHz, 24 bits (editing of up to 48 tracks at 48 kHz, up to 24 tracks at 96 kHz), we also provide Surround Sound processing/post-production of existing recordings: Analog sources are converted to digital using the OIBP technology (OIBP = Original Image Bit Processing).
In the case of multitrack originals, we can provide Surround Remastering of the original multitrack tape as well as new Surround mix (even for material that was not recorded for Surround applications).

Thanks to our proprietary technology, we can even imprint a Surround-like effect onto two-track material (AMSI = Ambient Surround Imaging)."


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