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Thread: Hdcd dsp

  1. #16
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    Re: Hdcd dsp

    Quote Originally Posted by garym View Post
    no clue what happened there. I don't use HDCD DSP, even on my HDCDs (because I want a bit perfect rip, and ripping via the DSP you no longer have a bit perfect rip). I could later convert my rips to other versions using the HDCD DSP, but I've found it is rarely worth it because many HDCDs don't actually use the HDCD features that make a difference (e.g, Peak Extension).
    Thanks

  2. #17
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    Re: Hdcd dsp

    To repeat from a post I made on this forum four years ago, one reason you see "non-HDCD" HDCD encoded CDs is that some recording engineers and producers like the "sound" of the encoder/analog to digital converter, originally made by Pacific Microsonics, so they feed audio through it even though they have turned off many of the encoder HDCD "features".

    To quote from the HDCD WIKI regarding compatible playback" "HDCD encodes the equivalent of 20 bits worth of data in a 16-bit digital audio signal by using custom dithering, audio filters, and some reversible amplitude and gain encoding: Peak Extend, which is a reversible soft limiter; and Low Level Range Extend, which is a reversible gain on low-level signals. There is thus a benefit at the expense of a very minor increase in noise.[3]

    The claim that the encoding process is compatible with ordinary CD players (without audible distortion) is disputed: not being able to decode the peak soft limiting, a normal CD player will output distorted peaks.[4] "

    You might find the Hydrogen Audio WIKI on HDCD of some interest - https://wiki.hydrogenaud.io/index.ph...atible_Digital

    If the Wikipedia WIKI is correct about peak distortion (and I have no way to prove or disprove it), and your player does not have the built in decoder, you might find it desirable to use the decoder DSP built into dBpoweramp, but realize that the audio file can no longer be made into a bit perfect copy of the source CD. If you care about bit perfect rips, then you could keep two copies, the original bit perfect rip, and the decoded version to listen to, subsequently processed through the dBpa converter using the DSP decoder codec.

  3. #18
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    Re: Hdcd dsp

    Quote Originally Posted by schmidj View Post
    To repeat from a post I made on this forum four years ago, one reason you see "non-HDCD" HDCD encoded CDs is that some recording engineers and producers like the "sound" of the encoder/analog to digital converter, originally made by Pacific Microsonics, so they feed audio through it even though they have turned off many of the encoder HDCD "features".

    To quote from the HDCD WIKI regarding compatible playback" "HDCD encodes the equivalent of 20 bits worth of data in a 16-bit digital audio signal by using custom dithering, audio filters, and some reversible amplitude and gain encoding: Peak Extend, which is a reversible soft limiter; and Low Level Range Extend, which is a reversible gain on low-level signals. There is thus a benefit at the expense of a very minor increase in noise.[3]

    The claim that the encoding process is compatible with ordinary CD players (without audible distortion) is disputed: not being able to decode the peak soft limiting, a normal CD player will output distorted peaks.[4] "

    You might find the Hydrogen Audio WIKI on HDCD of some interest - https://wiki.hydrogenaud.io/index.ph...atible_Digital

    If the Wikipedia WIKI is correct about peak distortion (and I have no way to prove or disprove it), and your player does not have the built in decoder, you might find it desirable to use the decoder DSP built into dBpoweramp, but realize that the audio file can no longer be made into a bit perfect copy of the source CD. If you care about bit perfect rips, then you could keep two copies, the original bit perfect rip, and the decoded version to listen to, subsequently processed through the dBpa converter using the DSP decoder codec.

    Thanks for the info. Will look into it.

  4. #19
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    Re: Hdcd dsp

    I think I have found the answer to why it decoded the SACD to 24-bit. That particular Dire Straits SACD is also HDCD encoded, although it is not mentioned as such. It is there in the wiki link mentioned above, if you click further on the link of HDCD encoded CD

  5. #20
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    Re: Hdcd dsp

    Quote Originally Posted by Partha View Post
    I think I have found the answer to why it decoded the SACD to 24-bit. That particular Dire Straits SACD is also HDCD encoded, although it is not mentioned as such. It is there in the wiki link mentioned above, if you click further on the link of HDCD encoded CD
    But to be clear, dbpa did NOT decode the SACD to 24 bit. dbpa did not extract the SACD layer. It decoded the regular CD layer (that is also contained on the SACD physical disk) to HDCD. This "CD layer" could certainly be one created with HDCD, as you note.

  6. #21
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    Re: Hdcd dsp

    Quote Originally Posted by garym View Post
    But to be clear, dbpa did NOT decode the SACD to 24 bit. dbpa did not extract the SACD layer. It decoded the regular CD layer (that is also contained on the SACD physical disk) to HDCD. This "CD layer" could certainly be one created with HDCD, as you note.
    Yes, the CD layer is created with HDCD. Check the wikipedia link above.

  7. #22

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    Re: Hdcd dsp

    Quote Originally Posted by garym View Post
    Unlikely as one would have to have an old sony playstation with correct firmware to even try to do it. The makers of SACD disks do NOT want them ripped.
    One can now rip SACDs for your own backup using certain model players. I have an Oppo BDP 105D that can do so. There are others also. See this thread: https://audiophilestyle.com/forums/t...comment-559449. Start from the top...there are a couple of summaries on steps to follow and players that have the right combination of chip and firmware. Good luck.

  8. #23
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    Re: Hdcd dsp

    Nevertheless this is not legal in most countries...


    Dat Ei

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