The Logic Off Topic list

[Redirected from LUG to Logic-OT:]

From: "Ronald C.F. Antony" <rcfa+logicaudio@...>
Date: Fri Feb 15, 2002 5:08pm
Subject: Re: [LUG] [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.

This depends on the filter. Might as well be sawtooth (if you assume
linear interpolation between sample points) or whatever else, rather
than hard level stepping.

The idea is however that any decent DA converter
filters the not explicitly sampled high-frequencies. So what you're
left with, ideally, after the filter is a sine wave. Otherwise
you'd have a stepped or edgy output signal even for higher
frequencies.

This, besides the effects of jitter, explain why there is such a
huge difference in sound between digital playback devices. If it
weren't for the difference in quality of the clock and filter
design, they should all sound the same, but they don't.

Ronald
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
~~~~
"The reasonable man adapts himself to the world; the unreasonable one
persists
in trying to adapt the world to himself. Therefore all progress depends
on the
unreasonable man."  G.B. Shaw  |  rcfa @ cubiculum . com  |  NeXT-mail
welcome