From: utzoo!decvax!cca!hplabs!pdh
Newsgroups: net.audio
Title: Re: Digital vs. analog
Article-I.D.: hplabs.607
Posted: Wed Aug  4 01:31:11 1982
Received: Thu Aug  5 00:59:31 1982
References: tekcrd.364

I, too have heard of a number of good arguments against digital recording
techniques using the 50Khz sampling rates.  The best one I have been able to
come up with so far is that, at that sampling rate, potential channel-to-
channel phasing misalignment at much over 15KHz COULD be tremendous, possibly
as high as 20 or 30 degrees.  This phase misalignment would vary with
frequency, due to the way the A/D's work, and so the final result is a
piece of music with very vague and poorly defined imaging.  I have noticed
this in every digital album I have heard to date (about 30).  The big
deal with this is that the problem won't go inaudibly away until the sampling
rate is up around 300KHz or more, which is WAY out of the range of technology.
One possible solution to the problem would be to digitize the signal from
the microphones onto several different digital master tapes, and then use
a computer to correlate the signals, and assure proper phase alignment.  This
should work by statistically making the maximum phase alignment proportional
to the number of master tapes being correlated into a single master.

				Peter Henry
				hplabs!pdh