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- From: shoppa@erin.caltech.edu (TIM SHOPPA)
- Newsgroups: sci.electronics,rec.audio,alt.folklore.computers
- Subject: Re: Life after CDs
- Message-ID: <27JUL199209444686@erin.caltech.edu>
- Date: 27 Jul 92 17:44:00 GMT
- References: <14mdkjINNb4m@grapevine.EBay.Sun.COM> <1343@eouk9.eoe.co.uk> <1682E149E4.ALAN@VM1.McGill.CA> <1992Jul27.092328.21478@discus.technion.ac.il>
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- Organization: California Institute of Technology
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- In article <1992Jul27.092328.21478@discus.technion.ac.il>, sorin@techunix.technion.ac.il (Goldenberg Sorin) writes...
- >Somehow the cd manufacturers seem to squeeze more music into the c.d.
- >I have Mahler 2.nd with Klemperer - above 79 min.
- >
- I am far from an expert on CD formats and technology, but it seems to
- me that the CD manufacturer could lengthen the format the same way that an
- LP manufacturer did - by allowing less space between the spirals (a.k.a.
- "grooves"). CD's are not recorded in tracks and sectors as are floppies, but
- in a spiral. This allows the head-positioning algorithm to smoothly track
- along as music plays, instead of having to jump from track to track and
- simultaneously trying to ensure that enough music was stored in the buffer to
- continuously play as the head settles on the new track. There is probably a
- "standard groove spacing" for CD's, otherwise they would do the same thing
- that LP and 45 manufacturers did: vary the groove spacing for each and every
- record to utilize most of the surface. It would seem from the testimonials
- on the net that CD's can go longer than the "standard", thus there must be
- enough tolerance in most CD players to allow them to use narrower-than-
- normal track spacing.
- I remember from articles in Radio-Electronics etc. when CD's were new,
- some mention of the spiral-tracking technology, something about guard tracks
- on the outside of the data that helped keep the servos locked on as the music
- played.
- Also, I believe the same article pointed out that music *could* be
- recorded on both sides! Has anyone actually seen this done? It would mean
- that program information (and the trendy art designs) we are used to would
- be non-existent or in the very center circle of the CD.
-
- I'm still waiting for the White Album on a single CD! Buying something
- on multiple CD's that could be put onto just one reminds me of Peter Schickele's
- PDQ Bach routine, where the radio station WOOF is offering a prize of
- Wagner's entire Ring cycle on "convenient" 45's, to be mailed one a week...
-
- Tim (Shoppa@erin.caltech.edu)
-