[ProAudio] [ProAud] The High-Resolution Challenge

Wed Feb 12 08:24:37 EST 2020

> On Feb 11, 2020, at 13:28, Bob Katz via ProAudio <proaudio at bach.pgm.com> wrote:
>  J. R. Stuart and P. G. Craven, “The Gentle Art of Dithering” J. Audio Eng. Soc., vol. 67, no. 5, pp. 278–299, (2019 May.). DOI: https://doi.org/10.17743/jaes.2019.0011 <https://doi.org/10.17743/jaes.2019.0011>he points out on page 290 the number of decimators and upsampling filters that occur in typical chip-based converters. And that these stages are not dithered. And that there are fewer of these stages when the converters are used at a higher sample rate. Smoking gun.... 
> BK

If you look at the specs for converter chips themselves, you will see that the noise and distortion figures are higher when used at the multiple rates (88.2, 96, 176.4, 192) than they are at 44.1 or 48kHz

“Smoking gun" indeed.

-CZ

http://www.zmix.net

http://www.allmusic.com/artist/chuck-zwicky-mn0000126243

On 2/11/20 1:28 AM, James Johnston via ProAudio wrote:
> I must say that I am sorely tempted to see if I can get somebody to whip up an app that measures effective bandwidth of a PCM track at any common sampling rate.
> 
> On Mon, Feb 10, 2020 at 10:15 PM mark whitehouse via ProAudio <proaudio at bach.pgm.com <mailto:proaudio at bach.pgm.com>> wrote:
> Following on from our discussion of around 18 months ago,
> I know in Australia there were moves to get some kind of "truth in marketing" 
> in regards to High sample rate recordings.
> And promoting the differences in standards that are now available. 
> 
> Essentially a standard that could be understood by and promoted to consumers, musicians etc.
> 
> It doesnt seem to have gone far and when you see things like this
> http://archimago.blogspot.com/2013/07/list-suspected-44-or-48khz-pcm.html <http://archimago.blogspot.com/2013/07/list-suspected-44-or-48khz-pcm.html>  
> 
> It makes you wonder if things will improve.
> Is there any consensus on getting this acknowledged? 
> 
> regards
> Mark  
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> On Fri, Jun 15, 2018 at 8:25 AM Mark Waldrep <mwaldrep at aixmediagroup.com <mailto:mwaldrep at aixmediagroup.com>> wrote:
> In the interest of exploring the issue of perceptibility of high-resolution vs. Redbook versions of the exact same file, I've posted on my blog page today "The High-Resolution Audio Challenge". I've prepared 6 of my AIX Records native 96 kHz/24-bit PCM masters as A and B versions. One is the original high-res master and the other is a Redbook downconversion. You are welcome to download the files and play them. Please do not share them outside of the group. I'm conducting a casual survey to see if people can detect differences. I don't claim this will be definitive. However, I've always complained that previous tests failed because the source materials weren't actual high-resolution files. This removes that flaw. These are the real deal. The conversion was done using triangular dither and noise shaping.
> 
> You can find the article at http://www.realhd-audio.com/?p=6197 <http://www.realhd-audio.com/?p=6197>
> 
> Mark Waldrep, Ph.D.
> AIX Records and author of
> Music and Audio: A User Guide To Better Sound
> 
> 
> On 6/14/18, 3:13 PM, "Stephen Morley" <proaudio-bounces at bach.pgm.com <mailto:proaudio-bounces at bach.pgm.com> on behalf of stephenmorley at iprimus.com.au <mailto:stephenmorley at iprimus.com.au>> wrote:
> 
>     I can record DXD and the downsample in Pyramix, or else at 192/24 and then downsample to 44/24
>     -------- Original message --------From: James Johnston <audioskeptic at gmail.com <mailto:audioskeptic at gmail.com>> Date: 14/6/18  8:56 pm  (GMT+10:00) To: proaudio at bach.pgm.com <mailto:proaudio at bach.pgm.com> Subject: Re: [ProAud] Wow. 384/32 LPCM! 
>     Just make sure the content is identical on both.
> 
>     On Thu, Jun 14, 2018 at 2:36 AM, Stephen Morley <
>     stephenmorley at iprimus.com.au <mailto:stephenmorley at iprimus.com.au>> wrote:
> 
>     > Hi James,I could send something, but not until next week when I return
>     > from leave.Stephen
>     > -------- Original message --------From: James Johnston <
>     > audioskeptic at gmail.com <mailto:audioskeptic at gmail.com>> Date: 13/6/18  8:53 am  (GMT+10:00) To:
>     > proaudio at bach.pgm.com <mailto:proaudio at bach.pgm.com> Subject: Re: [ProAud] Wow. 384/32 LPCM!
>     > I'll repeat my request:
>     >
>     > Send me some recordings at 24/192 and a similar one at 44/16. I can and
>     > will measure the actual "information" present, via SFM and bit depth.
>     >
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>     -- 
>     James D. (jj) Johnston
>     Independent Audio and Electroacoustics Consultant
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> James D. (jj) Johnston
> Independent Audio and Electroacoustics Consultant
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