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In article <ABL.90Jun2233534@dart.ece.cmu.edu>, abl@dart.ece.cmu.edu 
(Antonio Leal) writes:
> In article <1990Jun2.182334.21396@athena.mit.edu> maddog@athena.mit.edu 
(Matthew J Marjanovic) writes:
>> Is it possible?
>> Someone gave me a supposedly broken tape player to look at [...]

> Have you considered the possibility that the tape player(s) may be
> running fast ?
> It's kind of hard to make quartz-oscillator digital circuits run slow[...]
> --
> Antonio B. Leal		Dept. of Electrical and Computer Engineering
> Bell: [412] 268-2937		Carnegie Mellon University
> Net: abl@maxwell.ece.cmu.edu	Pittsburgh, PA. 15213   U.S.A.

After all of this ...

There is no way in the world that the CD player would play "slow" or "flat"
because of the nature of the beast.  If the disc spins at the wrong speed, 
you will get errors beyond belief (depending on how 'wrong' the speed is).  
If the data is clocking into the DAC at the wrong rate, you would get weird 
sounds or muting even.  It is impossible for the pitch of the CD to be any 
different than when it was recorded to the disc, because the numbers cannot
be pitch-shifted by a simple speed adjustment.  Pitch-shifting in the 
digital domain is a fairly ugly computational process, usually handled by
high-speed DSP chips.  Anyway, the point is that the CD player in 
question here is not slow, the tape deck is fast, and you should look for
the pot inside the tape deck to adjust this (if one even exists!).

You should find that one CD is exactly in tune with another CD (as long as
it's the same music... :-) ) because they all have the same digital master.

Gosh, I really can ramble on... :-)
-- 
===========================================================================
   Chuck Urwiler    University of Miami Music Engineering   Voice & Keys  
 chuck@umiami <<BITNET ADDRESS   chuck@umiami.miami.edu <<INTERNET ADDRESS
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Disclaimer: I only work and learn at this University. I don't speak for it!