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- Xref: sparky sci.electronics:13595 rec.audio:11015
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- From: sklower@diva.Berkeley.EDU (Keith Sklower)
- Newsgroups: sci.electronics,rec.audio
- Subject: Re: Length of CDs (was Re: Life after CDs)
- Message-ID: <44535@ucbvax.BERKELEY.EDU>
- Date: 30 Jul 92 00:59:00 GMT
- References: <1992Jul27.092328.21478@discus.technion.ac.il> <27JUL199209444686@erin.caltech.edu> <7942@sirius.ucs.adelaide.edu.au>
- Sender: nobody@ucbvax.BERKELEY.EDU
- Organization: UC Berkeley EECS/TCS
- Lines: 19
-
- In article <7942@sirius.ucs.adelaide.edu.au> francis@cs.adelaide.edu.au
- writes:
- ... (A very thorough and enlightening article discussing the encoding
- of data on a compact disk, and its implications for the amount of
- data that can be stored thereon) ...
-
- But Francis neglected to mention another practical matter which effectively
- limits the amount of time to slightly less than 80 minutes, which is the
- longest 3/4" (umatic) video tape that you can conveniently obtain!
-
- It is >>still<< the case that what you send to a CD pressing plant has
- the sound samples encoded in the video portion of a umatic tape,
- with SMPTE time code running continuously in one of the audio channels
- and a list of start and stop times encoded as a burst at 4800 baud
- at the beginning of the other channel.
-
- A blank 60 minute tape for this purpose costs $30-40; an 80 minute
- tape costs $55. It also apparently takes a fair amount of tweaking
- and adjusting of the umatic recorder to deal with the longer tapes.
-