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Reference Recordings 'HRx' DVDs.

Discussion in 'audio' started by Jim Audiomisc, Apr 12, 2019.

  1. Jim Audiomisc

    Jim Audiomisc pfm Member

    I've just been having some discussions about these with someone and am currently puzzled wrt one point. So I'm wondering if anyone here has any of the discs and can help.

    I have one short (downloaded) file, which when analysed gives me the results shown here.

    and I've found the list of available DVDs here.

    In short: I'm puzzled by the ambiguous wordings used about the material being 176.4k 24bit *and* HDCD. Not clear what is meant becanse HDCD was *explicitly* specified to be a way of getting higher range onto *CD* in what otherwise presents as 44.1k/16, but with 'hidden' codes. Do the DVDs have *both*, or what?

    Say more later, but I'll put this up to start so people can have a look...
  2. Jim Audiomisc

    Jim Audiomisc pfm Member

    To explain the results I plotted.
    The top-left spectrum shows the results averaged over the entire file. (176.4k/24) Although in theory giving a bandwidth of over 88k, it shows there is proably naff-all but 'process noise' by the time you get to 20kHz or so. The other plots relate to the dynamics. These are good with high peak-mean ratios, no sign of any peak compression, etc.

    So far as I can tell, the 176.4k/24 file has no sign of any HDCD codes, and no sign of being 'undecoded HDCD'. Thus I assume that it - and the other high-rate files of this kind from RR - aren't themselves HDCD encoded. But I assume *are* the source recording versions used to *create* 44.1k/16 HDCD encoded material for their HDCDs.

    The problem is that the wording on the RR site may make people think otherwise. So am I missing something?

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