13 karma · joined June 6, 2024
You are arguing about techniques you have no experience with.
The half speed you call naive is again just showing your ignorance. Sound editors have been using this technique since the days of recording on a Nagra at 15ips and literally replaying at 7.5ips half speed, and at 3.75ips for quarter speed. There is nothing naive about it, it is a very well know technique. To be able to achieve the same result digitally with full spectrum has impacted every feature film you have experienced in recent years. Again I speak from decades of lived experience.
Surely you understand a recording made at 48kHz has a max freq response of 24kHz and played at half speed that max freq is 12kHz and at quarter speed only 6kHz. You can very clearly hear the filter cut off due to Nyquist. Record at 192kHz with mics capable of 100kHz capture and when played at quarter speed, the sound is full spectrum because there is no truncated frequency response. And when I load a 192kHz recording to izotope RX I can literallu see the harmonics going up to 96kHz. (not with every sound of course)
I repeat, i am not talking about 'normal' listening. I am talking about an industruy you have no knowledge or lived experience with, so spare me the incorrect claims about what can & cant be heard.
I use microphones that can 'hear' up to 100kHz (Sanken CUX100K) and for film sound design playing 192kHz audio at half and quarter speed the results are very significant, and reveal there IS 'content' above human hearing. Irrelevant for general listening but very important for sound design.
Second, why not do a null test? Invert phase of MP3 and mix it with uncompressed WAV file. The remaining audio IS the difference, and it is audible.. But it is only significant if you have a good sound system & have ears capable of critical listening.
Third, what volume SPL were they listening at? A compressed JPG looks ok on a small screen but project it large and the image becomes blocky. Same applies to audio.
Fourth, tester fails to mention age and results of a recent hearing test. Maybe they have no perception over 12kHz? We do not know.
Failed test, confirms user bias, as expected.
https://web.archive.org/web/20141111015756/http://noyzelab.b...
https://web.archive.org/web/20141112205122/https://noyzelab....
https://dadadrummer.substack.com/p/anti-copyright-extremists