Check out this PCM vs. DSD wave comparison

Discussion in 'Archived Threads 2001-2004' started by LanceJ, Jan 15, 2003.

  1. LanceJ

    LanceJ Producer

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  2. Jesper

    Jesper Stunt Coordinator

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    Thank you! [​IMG]
     
  3. KeithH

    KeithH Lead Actor

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    Very interesting! Lee? John? Comments? [​IMG]
    From the link:
     
  4. Lee Scoggins

    Lee Scoggins Producer

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    This is what one would expect from Craigman Digital, a consultant to Warner and the DVDA working group.
    As far as noise in the ultrasonic band goes, even Vanderkooy acknowledges both noise issues in DVD Audio and DSD. He further has agreed at AES conferences that DSD noise can almost be completely eliminated with dithering techniques to a vanishingly low -160 to -180 db floor, as Dirk Reefman of Philips has shown.
    This is more about marketing than science. [​IMG]
    A better test is one actual music, particularly female voice and high frequencies and acoustic musical instruments. There one can understand the advantages of Super Audio's higher sampling rate.
    [​IMG]
     
  5. Dan Joy

    Dan Joy Supporting Actor

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    OH boy, here wo go again[​IMG]
    in my best parent voice: Children, if I hear anymore fighting, I will have to separate you into two separate rooms, just like the kids in Audio Asylum!
    [​IMG]
     
  6. Lee Scoggins

    Lee Scoggins Producer

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    Yes Dan, but I did not start the discussion here and it is a clearly marked comparison thread.
    [​IMG]
     
  7. Philip Hamm

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  9. Lee Scoggins

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  10. Lee Scoggins

    Lee Scoggins Producer

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  11. Justin Lane

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  12. Philip Hamm

    Philip Hamm Lead Actor

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    Lee did you read your post? You started by disagreeing with my statement
     
  13. Michael St. Clair

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  14. Jagan Seshadri

    Jagan Seshadri Supporting Actor

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    Great to see these graphs instead of the Sony/Philips DSD vs 44.1/16 comparison. Also, great to see that an analog oscilloscope was used here.[​IMG] Still, it would be nice to know what model of 'scope was used for the tests.
    As expected, the DSD signal is blurred with noise-shaping dither, which is fine, since this ultrasonic noise gets filtered off anyway. A "dirty little secret"? Hell, Sony Bit-Mapping (SBM) uses dithering (which causes this blur) and 1-bit converters A/D with noise shaping also do this. It's not dirty - dithering is a psychoacoustic necessity for getting 1-bit systems to sound good.
    The 192kHz trace is great. I was surprised that the 96kHz trace was not as accurate as I had imagined. Now I know.
    It is interesting to see that the same overshoot/undershoot (Gibbs' phenomemon) happens with both PCM and DSD.
    I dont follow this last comment though:
     
  15. Lee Scoggins

    Lee Scoggins Producer

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  16. Jagan Seshadri

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  17. KeithH

    KeithH Lead Actor

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    Dan said:
     
  18. Justin Lane

    Justin Lane Cinematographer

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  19. Lee Scoggins

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