Interesting. But I believe HDCD and CD with De-emphasis are 2 different things and thus need different ripping method.
Anyway, I kept searching informations and it seems that when ripping HDCDs in a simple way (copying waves instead of making ISO keeping cd's sub channels), a part of the needed information to decode properly HDCD is not retained.
I found a post that summarizes clearly everything I read on this subject ;
http://forums.stevehoffman.tv/thread.../#post-5695519
Quote:
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Originally Posted by GreenDrazi
Foobar2000 and dBpoweramp HDCD detection & decoding are based on HDCD.exe, which was created by emulating Windows Media Player. What WMP does not do (and consequently, neither does HDCD.exe) is decode the transient filter function. Although, it can detect it.
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And the transient filter information is apparently in the sub channels I evoked earlier.
It means that the HDCD conversion is done but not exactly how it should be.