Difference between revisions of "High resolution"

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(More explanation; RIAA definition; faking it.)
 
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With regards to audio, '''''high resolutions''''' often means using [[sampling rate]]s higher than 48kHz and/or [[bit depth]]s higher than 16bit
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With regards to (digital) audio, '''''high resolution''''' typically means [[sampling rate|sampling rates]] / [[bit depth|bit depths]] exceeding 48 kHz / 16 bits (compare to [[CD|CD's]] 44100/16).  48k/16 is the least sampling rate and bit depth possible in [[DVD|DVDs]] that choose [[PCM]] for audio<ref>https://en.wikipedia.org/wiki/DVD-Video#Audio_data</ref>, and was at some time even more common than 44.1k/16 in computer soundcards (cf. Intel's AC'97 standard<ref>https://en.wikipedia.org/wiki/AC%2797#Revisions</ref>).  Given that this format is widely accepted as sufficient as an end-user format, given the limitations of human hearing, the absence of a ''universally agreed-upon'' definition of “high resolution” audio need not be of much practical concern, and possibly the least resolution accepted in any widepsread definition is 48 kHz / 20 bits adopted for marketing purposes by the RIAA<ref>https://www.riaa.com/high-resolution-audio-initiative-gets-major-boost-with-new-hi-res-music-logo-and-branding-materials-for-digital-retailers</ref>. 
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There are "fake" high resolution claims made for marketing purposes, and also algorithms that manipulate the audio to that end - notably has the lossy MQA format been exposed of adding noise to CDDA format files and falsely presenting the doctored file as an "authentic" high-resolution master<ref>https://www.audiosciencereview.com/forum/index.php?threads/mqa-deep-dive-i-published-music-on-tidal-to-test-mqa.22549</ref> - but arguably, this constitutes only a next step over [[lossy]] files decoded and sold as lossless, or fake SPARS codes indicating that a CD was digitally sourced<ref>https://en.wikipedia.org/wiki/SPARS_code</ref>.
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Latest revision as of 12:33, 15 January 2022

With regards to (digital) audio, high resolution typically means sampling rates / bit depths exceeding 48 kHz / 16 bits (compare to CD's 44100/16). 48k/16 is the least sampling rate and bit depth possible in DVDs that choose PCM for audio[1], and was at some time even more common than 44.1k/16 in computer soundcards (cf. Intel's AC'97 standard[2]). Given that this format is widely accepted as sufficient as an end-user format, given the limitations of human hearing, the absence of a universally agreed-upon definition of “high resolution” audio need not be of much practical concern, and possibly the least resolution accepted in any widepsread definition is 48 kHz / 20 bits adopted for marketing purposes by the RIAA[3].

There are "fake" high resolution claims made for marketing purposes, and also algorithms that manipulate the audio to that end - notably has the lossy MQA format been exposed of adding noise to CDDA format files and falsely presenting the doctored file as an "authentic" high-resolution master[4] - but arguably, this constitutes only a next step over lossy files decoded and sold as lossless, or fake SPARS codes indicating that a CD was digitally sourced[5].

  1. ↑ https://en.wikipedia.org/wiki/DVD-Video#Audio_data
  2. ↑ https://en.wikipedia.org/wiki/AC%2797#Revisions
  3. ↑ https://www.riaa.com/high-resolution-audio-initiative-gets-major-boost-with-new-hi-res-music-logo-and-branding-materials-for-digital-retailers
  4. ↑ https://www.audiosciencereview.com/forum/index.php?threads/mqa-deep-dive-i-published-music-on-tidal-to-test-mqa.22549
  5. ↑ https://en.wikipedia.org/wiki/SPARS_code
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