source file: mills2.txt
Date: Tue, 18 Mar 1997 11:08:19 -0800

Subject: Re: unheard frequencies

From: rtomes@kcbbs.gen.nz (Ray Tomes)

alves@Orion.AC.HMC.Edu (Bill Alves) wrote:

>Ray Tomes wrote:
>>... Some CD manufacturers now add overtones
>>to the high frequencies because that normally produces a more natural
>>sound.  This little trick does fool those individuals who could tell the
>>difference before.

>I'm afraid I'm not following. How could CD manufacturers add overtones? If
>you mean that they are adding harmonics to the recorded sound, then the
>highest pitch that they could add a harmonic to would be 11 kHz, since its
>second harmonic (first "overtone") would be at 22kHz. All CD players
>include an anti-imaging filter that effectively eliminates all frequencies
>higher than 22k anyway (often with significant attenuation above about
>18k).

I'm sorry, I have confused things by leaving out a word.  I should have
said CD-player manufacturers.  The harmonics are added during the play
of the CD because obviously they cannot be recorded as you say.

-- Ray Tomes -- rtomes@kcbbs.gen.nz -- Harmonics Theory --
http://www.kcbbs.gen.nz/users/rtomes/rt-home.htm

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