Digital Technology Collection

Discussion in 'Digital Sources' started by Negotiableterms, Mar 28, 2006.

  1. Joe Dawson

    Joe Dawson Active Member

    Messages:
    206
    [QUOTE=' post: 12363913, member: 52426"]Another great article debunking the BS of the audiophile magazines, written by a production engineer.

    http://productionadvice.co.uk/no-stair-steps-in-digital-audio/[/QUOTE]

    Cpt debunks the article. Below is an article, and notice the "stairsteps". Of course, it takes time for the sample to occur; the sample is not instantaneous. And there are only ~65,000 values with 16 bit, so approximations. Besides that, there are tolerances of parts/circuitry to consider.

    http://www.blazeaudio.com/howto/bg-digital.html

    Also interesting is that an old Orinda digital "master disc concept", "Digital Master Disc", LP that sounds horrible with digititis. Interesting that an LP has enough resolution so as to perceive the shortcomings of digitial.

    Then there is the analog section quality of the solid state chip itself to consider, and what surrounds the chips in terms of parts and quality. Is 50 cents worth of parts that high of sonic quality?

    keep on truckin

    joe
     
    Last edited: Feb 3, 2019

     

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  2. cpt_paranoia

    cpt_paranoia Super Member

    Messages:
    1,183
    I offered a critique of the simplistic presentation in the video. My intention was not to 'debunk' the basic concept.

    A DAC chip has sample steps. These steps contain high frequency signals (Fourier series analysis will show a sinc series). These signals are the imaging alias artefacts of the zero order hold. They are removed by the reconstruction filter. The output of this filter is smooth, as the high frequency content creating the steps has been removed.

    Using an upsampling filter in the DAC allows the reconstruction filter to be more effective at removing the high frequencies that form the steps, or to be gentler on the in-band audio.

    A DAC followed by a reconstruction filter does not have a stepped output.
     
  3. Joe Dawson

    Joe Dawson Active Member

    Messages:
    206
    Did not mean to debunk the entire concept, just the video claiming no steps. Theory vs reality. My apologies cpt. I was thinking of your previous comments concerning steps, and a DAC chip is therefore followed by a Nyquist reconstruction filter, to remove the steps.

    keep on truckin
    joe
     
    Last edited: Feb 5, 2019

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