Klarinet Archive - Posting 000702.txt from 1997/11

From: Roger Shilcock <roger.shilcock@-----.uk>
Subj: Re: Nyquist and analog
Date: Thu, 20 Nov 1997 04:11:12 -0500

Can anybody join in????
On the face of things, human ears don't perform Fourier analysis. Some of
what has been said seems to suggest that they do, with this stuff about
hearing or not hearing "components". I thought it was accepted that even
what would be inaudibly high *components* of an audio signal (meaning, if
anyone's forgotten, a *musical sound* in the first place) contribute
additively to what is heard. Even if all the components below 20 KHz can
be faithfully reproduced, then the original sound is compromised - just as
it is with analogue recording, for different reasons.
Roger Shilcock

On Wed, 19 Nov 1997, Bill Hausmann wrote:

> Date: Wed, 19 Nov 1997 18:56:05 -0500
> From: Bill Hausmann <bhausman@-----.com>
> Reply-To: klarinet@-----.us
> To: klarinet@-----.us
> Subject: Re: Nyquist and analog
>
> At 10:00 AM 11/19/97 -0800, Jerry Korten wrote:
> >By definition, a sampling process that cannot represent a continous
> >process. This is a fact. It is why the process is called sampling. The high
> >frequency portion of the signal (which is filtered out to avoid aliasing)
> >is not present on the recorded material when digitization occurs. This is
> >the main reason that the harmonic structure on a CD does not match what the
> >ear hears from a live performance or an analog recording.
> >
> Excuse me, but isn't the filtered high frequency portion (above 20 kHz)
> exactly the part our ears *DON'T* hear from a live performance or an analog
> recording?
>
>
>
> Bill Hausmann bhausman@-----.com
> 451 Old Orchard Drive http://www.concentric.net/~bhausman
> Essexville, MI 48732 http://members.wbs.net/homepages/z/o/o/zoot14.html
>
> If you have to mic a saxophone, the rest of the band is too loud.
>