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From: =?iso-8859-1?q?Pev?= <no_such_user@...>
Date: Thu Feb 14, 2002 0:30pm
Subject: Re: [GEN] Is 24 bits for A/D much more important than going up 
to 96k?

 > > However, still as a
 > > consequence of physics, the only sound at 24 khz that is
 > > reproducable with 48 khz equipment is a sine wave.
 > Square wave.
Yes and no.

Yes : at full rate, the bit-on bit-off behaviour will produce a square wave
in the *digital data*.

No : In practice this is not the case! All D->A converters will have a low
pass filter with a cut off at the nyquist frequency ; 24k in this case. This
will turn the square wave into a sine.

If you have a square wave at 24kHz with a 48kHz sample rate, you have some
serious aliasing problems!

HTH,

~Pev