Phil Leigh wrote: > The "numerically zero" part works only in the digital domain. Once in > analogue world we have the noise floor of the source and soundcard to > contend with... plus the tiny drifting of the source sample clock...
I thought we were in the digital domain, doing analysis after you have run the signals through a ADC. > The software does a very sophisticated job of aligning the two signals > in time, minimising any false "nulls". Which is usually done with an autocorrelation. There are other approaches. > The software tells you in dB how far down in the mix any difference > is. Even 70 dB down is not 'audible' to non-canines. > Listening to the difference - boosted by 60dB so you can actually hear > it! - is interesting. Sometimes its just white noise - sometimes you > can hear remnants of the music + noise... Interesting, clearly if its white/pink/whatever noise, its not important. Any guess as to why you can sometimes here music in the noise? Can you hear the melody? or just some impact/transients? I'm surprised that you say "tiny,tiny difference: 1) FLAC vs bitrate limiting via LAME to 256" Does this vary with different types of source? I would expect things like a jazz trio, or Tony Rice on guitar solo would be more than tiny tiny. Unless the software fixes the phase errors. > It would be useful if others could comfirm or deny any of my findings > so far... Interesting, this might make me connect up my M-Audio Delta 1010 and do some testing. Its no longer high end, but its a decent ADC -- Pat Farrell http://www.pfarrell.com/ _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
