Klarinet Archive - Posting 000706.txt from 1997/11

From: Jonathan Cohler <cohler@-----.net>
Subj: Re: Nyquist and analog
Date: Thu, 20 Nov 1997 07:17:30 -0500

Bill Hausmann wrote:

>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?
>

Precisely.

------------------
Jonathan Cohler
cohler@-----.net