[vorbis] Copy protected CDs (off-topic)
pfk at fuchs.offl.uni-jena.de
Wed Dec 20 16:09:17 PST 2000
:: A lot of cheap CDR's are chock-full of biterrors, especially if a
:: not-all-that-great CD writer was used.
:: But the most-occuring problem with CDR audio CD's is clock jitter, like
:: Gregory mentioned. Look around on the web and you'll find some reports.
:: I believe there was a discussion on this on the mp3encoder list a few
:: months ago, as well.
In the past I've tested a $100 CD player and two $300 Tape deck with
excellent tapes. There was recorded a special signal on CD-R and on the
tapes. They were played and digitally recorded by a professional AD
converter. The signal was frequency and amplitude demodulated.
At every frequency from 0.1 Hz...6 kHz the CD player was at least 42 dB
better than the tape decks (if I assume that the professional AD converter
has no errors). May be you can hear the modulation, but what about the
distortions of the tape decks?
To my mind the "jitter" is an invention of the audio industry to pinch you
money, no less and no more.
Mit freundlichen Grüßen
eMail | pfk at uni-jena.de home: pfk at schnecke.offl.uni-jena.de
phone | +49 (3641) 64-2721 home: +49 (3641) 390545
sMail | R.-Breitscheid-Str. 43, 07747 Jena, Germany
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