Re: Trying to learn to understand spectral analysis of mp3s Reply #50 – 2016-07-26 15:06:49 Quote from: zWore on 2016-07-26 13:51:00I forgot to mention synesthesiaMentioning won't do. I know synesthesia. I don't see what it has got to do with our topic. If you want to convince anyone, you will have to actually present a coherent argument.QuoteAnd for everyone still bearing a "Your eyes cannot hear" tattoo on their foreheads I prepared some links:None of those links appears to have anything to do with our topic. I consider it quite rude to expect us to read through long texts without even a hint as to what you think those texts are contributing to the topic.QuoteI operate with [live by] the first statement when acquiring new music. Which I think cannot be argued with, in regard to high frequenciesMP3 drops high frequencies because its underlying psychoacoustic model judges them to be relatively unimportant for the perceived sound. If the psychoacoustic model is good, the judgment is correct, no matter what your favorite dogma may say. The psychoacoustical model that MP3 uses has been tested and refined a lot, and the hearing of very many people went into it. You may have the idea that the frequencies between 16 kHz and 20 kHz have a significant bearing on how you perceive music, but you are almost certainly mistaken.QuoteThe second one is based on what music I've already have and the new that happens to have cut-off lines below 19-19.5 kHzYou won't find many followers here if you don't show some evidence that you can discern this in practice. Merely repeating your strongly held belief is only going to get you kicked out.QuoteHaving tried new software for making 224-256 MP3's I'm having difficulty to tell the difference between them and 320'sNo surprise.QuoteYes. First I listen to, then maybe suspect, and only then check it out. Around 90% of the time I suspect correctly; which is in regard to that old music / codecs. I have a vast collection of music accumulated throughout the years, but only recently started to nice bad and terrible quality of some of it. And spectrograms are giving me a proof of thatProof of what exactly? Bad quality? That a codec was involved? That the codec was old?QuoteI will be glad to participate in such evaluation of my skills and claims: that I can tell if MP3 is of lower quality than ~256 [as I have never claimed that I can hear the difference between lossless and MP3 320]Go on then. Learn how to ABX using foobar2000.QuoteAm I to provide some song that I know, but in lossleess format; that will be encoded by you to lower-quality-but-made-to-look-in-spectrogram-like-320 so that I cannot cheat? Should / can I provide a rock / pop song, a classical piece and maybe something electronic?If you do the ABX testing properly it won't matter if you can discern it from the spectrogram or not.QuoteI can also provide you with a sample of a lossless file that looks A-OK in spectro, buts sounds terrible; which is rare case of something I do not comprehend yetNoone disputes that files can sound bad while looking OK in a spectrogram. That's one of the easiest things to comprehend, so no idea what you are having problems with.