Are they still making CDs with pre-emphasis, or are these some pretty old discs?
Egor, I've looked to side of sox. By some opinions it almost kills stereo from tracks
Quote from: EvilMax on 02 August, 2008, 10:38:30 AMEgor, I've looked to side of sox. By some opinions it almost kills stereo from tracks Eh? News to me. Could you post an example where SoX "kills" stereo, or refer us to some notes/opinions that explain how and why? SoX has a bit of a learning curve, so I suspect this is simply a case of someone's parameters not being quite right. - M.
Using Waves Q10 too. Tried Sox before but did hear a difference in stereo extensiveness (much better with Waves).
Yes, de-emphasis is meant to be done in the analog domain.Two reasons:1) That high 15us zero doesn't have enough resolution to do well in the digital domain.2) The de-emphasis can produce peaks that would clip in the digital domain.
FILE "test.wav" WAVE TRACK 01 AUDIO FLAGS PRE INDEX 01 00:00:00FILE "test-deemph.wav" WAVE TRACK 02 AUDIO INDEX 01 00:00:00
C:\audio>sox test.wav test-deemph.wav deemph
Interesting, is there information about de-emphasizing filter curve used in SoX anywhere ?
Quote from: EvilMax on 02 August, 2008, 02:32:16 PMInteresting, is there information about de-emphasizing filter curve used in SoX anywhere ?SoX is open source by the way
How is a de-emphasis filter going to interfere with stereo information?
Either SoX has been improved or my ears have changed for the worse.
Quote from: Surfi on 03 August, 2008, 11:17:57 AMEither SoX has been improved or my ears have changed for the worse.The sox changelog says that the deemph stereo bug was fixed in sox-12.18.2 (2006-09-03).Also the latest doc on the sox website has some words on the accuracy:The de-emphasis ?lter is implemented as a biquad; its maximum deviation from the ideal response is only 0.06dB (up to 20kHz). -bandpass
this is interesting, could you provide a link? Certainly more than WaveEmphs < 0.2 dB claim...