Ron Parker wrote:
> 
> On Tue, 30 Jan 2001 21:37:57 +0100, Tor Olav Kristensen wrote:
> >This is one of the problems with CD players:
> 
> Not with CD players, per se, since the filtering should happen in the
> studio, but it is a problem.

You may search for the this sentence:

"The need for placing a filter after the DAC in 
the player may not be intuitively obvious."

(Within the Aliasing section.)

at this page:

http://www.totse.com/en/technology/science_technology/cd_audio.html

to get an explanation of why such a filter
also are necessary in a CD-player.


> >It's difficult to design good and cheap
> >filters that has a very sharp cut-off
> >frequency that lies right above this
> >22 kHz frequency.

But I wasn't quite right about it STILL 
being difficult to perform this filtering 
in todays CD players. (See the "Digital-to
-analog Converters" section in the same 
document.)

DSPs seems to be the solution now.


Best regards,

Tor Olav

mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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