-Y setting? What does it do?
Reply #11 – 2003-03-02 05:18:01
If you use lowpass with VBR it does not (at least in principle) allocate "extra" bits to lower frequencies. Then the only reason to use lowpass is to just *save* bits for a small filesize ... And to remove some artifacts or echos or whatever from frequences that were above 20.5 kHz and mirrored down below 20.5kHz, if i understood correctly. Such things can then even be heared. But we never realy know - beside looking at every wav-File - if there was content above 20.5kHz and therefor we don´t know, if we need to cut some parts below 20.5kHz because of that. I have the feeling that --alt-presets can work with that So, it seems to be needed to go down as much as possible. But if i read correctly, there were much debate about what frequences people can hear and if there is some additional effect, that you can only feel instead of hear ... On a CD should be nothing higher than 20.5kHz, right? But there could be stuff up to 22.5 kHz. Do get away all possible artifacts or echos (don´t know that things), you would need to go as much down as 18.5 kHz ... At least, that should be save, yes? Being a bit more aggressive to that and we are at the standard setting of aps (19 kHz) ... With my extremist extreme setting i wanted to get away all not unusable frequences, but i did not know nothing about that mirroring from above 20.5 kHz ... again more to read Maybe i need to change my lowpass setting. Just trying to get things together