Detecting whether a 24-bit file has been upconverted from 16-bit? Reply #25 – 2012-11-09 15:01:46 Quote from: vincefalks on 2012-11-06 04:50:03I downloaded a FLAC album from online web store and it appears that the files I've downloaded are 24-bit. it's not a hd web store like hdtracks, it's generally a CD 16-bit 44.1kHz store with either FLAC or MP3 to choose from in its offerings. I'm wondering whether the 24-bit files are real and were supplied as 24-bit from the label and they just didn't label it correctly on the download page, or whether there was an encoding error or just somehow it made its way from 16-bit files to 24-bit FLACs.Is there a way I can definitively tell or analyze it (looking at spectral maybe) to see if it's been upconverted? Are there certain algorithms and 'good jobs' that can be done to make its 16->24 upconversion undetectable?Many of the actual upconversions are going to be pretty hard to determine by simple means. For example it is pretty well known that about half of all so-called HD tracks started out as analog tapes or non-CD digital recordings that either came from or passed through the analog domain during the transcription process.Catching only the clerical errors and obvious transcription errors is only a partial solution.