Phil Leigh;380810 Wrote: > I'm not sure how you've got to this place in your thinking, but if you > think that higher sampling rates are required for accurate recovery of > audio in the 0-20kHz range then you haven't grasped Information Theory > yet... >
Oh, I think that I grasp sampling theory pretty well. Did you read the cited article? Do you believe that a signal that is time-limited (like a piece of music) can be band-limited in the mathematical sense? Do you believe that a signal must be band-limited for Shannon, et al, to apply? But these logical arguments - valid as they might be - are of little practical value. In practice, let's just agree that a band-pass-filtered music signal can be treated essentially as a band-limited signal. But the other sources of sampling-related distortion do not disappear even when we allow that the digital data stream accurately captures the sampled data. Further, some of these deviations are positively correlated with sample interval, like sample-and-hold staircasing and slew rate effects. IOW, they get worse as sampling rate decreases. Finally, here's another way to think about it. Merely being able to recover the sampled points is insufficient to maximizing SQ. Radical. Why? INTERSAMPLE effects matter too. And more samples on a given signal minimize adverse effects in the intersample interval. We're trying to approximate the initial continuous event as precisely as the listener can resolve it, not merely recover the samples. So ultimately I am concerned more about what I hear than what I think. I have described what I hear as objectively as I can. If you think that I don't hear what I say I do, I have no response for that. Shall I quote Reyleigh next? "The ear is the final arbiter...." <g> -- teros ------------------------------------------------------------------------ teros's Profile: http://forums.slimdevices.com/member.php?userid=18601 View this thread: http://forums.slimdevices.com/showthread.php?t=57631 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
