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, and was at some time even more common than 44.1k/16 in computer soundcards (cf. Intel's AC'97 standard). 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.
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 - 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.
- ↑ https://en.wikipedia.org/wiki/DVD-Video#Audio_data
- ↑ https://en.wikipedia.org/wiki/AC%2797#Revisions
- ↑ https://www.riaa.com/high-resolution-audio-initiative-gets-major-boost-with-new-hi-res-music-logo-and-branding-materials-for-digital-retailers
- ↑ https://www.audiosciencereview.com/forum/index.php?threads/mqa-deep-dive-i-published-music-on-tidal-to-test-mqa.22549
- ↑ https://en.wikipedia.org/wiki/SPARS_code