- Mar 29, 2012
no no it's not about the ultrasounds we hear, what we need isn't the ultrasound data, what we need is the resolution to have at least 2 points to create a 22khz signal. so we need at least 44khz of bandwidth to get 2 samples of 22khz per period. if we had only 22khz sample rate, we could only get 1 sample per period of a 22khz signal and thus fail to reconstruct it. (like being asked to draw only one line crossing 2 points. if you have only 1 point you can no longer know which is the right line).
so we need the higher sampling rate, not higher frequency music.
and ABX can of course be cheated, that's why we suggest using the same resolution for both tracks but upsampling back, to limit the differences in timing. but in the end a guy who wishes to pass an abx can pass it, just open some spectrum showing if there is or not some ultrasound content and you pass anything without even listening. but we hope that people are looking for answers, not to behave like idiots.
Even if you upsample back the "lossy" track the ABX test is flawed because:
Let's say A is X and B is Y. Then when you're switching back and forth from A to X and A to Y, switching from A to X is near instant while swiching from A to Y takes more than 0.05sec (which you can notice). This can be easily fixed to, the script could take the 2 original files and actually duplicate them so the system actually has to load a new file when you switch between the 2 similar audio files (maybe I'll search the developer to suggest that feature).