TIP: Click on subject to list as thread! ANSI
echo: audio
to: DREW HOHMANN
from: MATT ION
date: 1996-08-14 14:28:00
subject: Re: Dolby

And so it came to pass, on 08-11-96 16:46,
   that Drew Hohmann spake unto Cameron Hall:
 DH> So the CD player rotates the CD at different speeds as it reads the
 DH> disc from inside to outside?  You'd think that it would be
 DH> difficult to set each CD player to such exact specs,
Not really -- just monitor the data stream coming off the disc and maintain 
the speed to keep it constant.
 DH> John has a good point here.  I thought that the CD player spun the
 DH> disc at a constant rate, like a record player. Though now you have
 DH> me confused.  A record player rotates at a constant rate, yet even
 DH> though the inside edges and the outside edges travel at different
 DH> speeds, their is no difference in pitch between the outside and
 DH> inside edges.  (Meaning if you had a 33 record playing at 45rpm,
 DH> it'd be higher pitched, yet even though the edges are traveling at
 DH> different speeds, it's the same pitch throughout the record).
That's because it's recorded the same way.  If you play with the pitch 
control on a tape deck while recording, then adjust the pitch control exactly 
the same way on playback, there's be no audible change in playback.
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Q: Why don't blind people skydive?
A: It scares the heck outta their dogs!
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--- Sqed/32 1.10/unreg
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* Origin: la Point Strangiato... (1:153/7040.106)

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