On Sat, 2013-04-06 at 03:03 +0200, Peder Hedlund wrote: > Quoting Ralf Mardorf <ralf.mardorf@xxxxxxxxxxxxx>: > > > FWIW I'm only experienced with stereo, not with 2D or 3D and I guess > > most engineers are inexperienced with 2D and 3D, however, assumed MP3 > > can be used for stereo, it would be interesting to know, if MP3 or > > another codec with inaudible loss, is able to keep the mix for a real 2D > > or 3D recording. I don't know how data reduction does work, but I guess > > there's an effect similar to a compressor (the effect app or device). > > No, data reduction in MP3, Vorbis, Opus, AAC or any of the other > technologies is not just like a regular compressor in any way, shape > or form. > Neither in the way of a 3:1, soft knee@-18 dB compressor or in the way > of a "repeat this 0101 pattern 24 times" zip file. I know, that's a misunderstanding, perhaps to my broken English. But there are two channels for stereo and for both channels the data will be reduced (I avoid to use the word "compressed" in this context). It's psycho-acoustic data reduction, so how can be ensured that the psycho-acoustic effect can keep the balance between the two channels, regarding to the recorded room? > It's exploiting the psychoacoustical fact that the sensitivity of our > ears depends a lot on which frequency we're listening to and that a > strong signal in one frequency completely masks a weak signal nearby > to our ears. > So if you have a -20 dB signal at 7kHz at the same time you have a > -5dB signal at 7.2kHz you can discard the former one since we won't > hear it anyway. The sound of an instrument will be the same as before, but the impression of it's position in the room might change. > There is an extension to MP3 called MP3 surround which is able to > handle 5.1 surround sound (2D and 3D are image formats, not audio > formats). Dimensions are dimensions, also for sound, but a common mistake is that people already call 2D sound 3D sound. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
