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Re: [ARSCLIST] Sampling Theory (was Fred Layn's post on the Studer list re: Quantegy)
At 09:35 PM 1/13/2005 -0500, Steven C. Barr wrote:
There is a difference, easily demonstrable by an a/b comparison
using a pair of oscilliscopes. By definition, a digital waveform
is a series of finite steps, not a smooth curve. Just as in integral
calculus, the goal is to obtain an infinitely large set of
infinitely small variations. However, the experts tell us that
beyond a certain point the human ear and human mind cannot notice
an identifiable difference.
If you can see the steps on an oscilloscope on the analog output of a
properly designed digital to analog converter, it isn't properly designed.
The "reconstruction filter" on the output is defined and will not show the
steps. This is brother Nyquist.
This is debated ad nauseam on the Pro-Audio list, and I'm not trying to
bring that discussion here, but you shouldn't be able to see the difference
on an oscilloscope or hear the difference.