Path: utzoo!attcan!uunet!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu
From: clouds@ccwf.cc.utexas.edu (Kathy Strong)
Newsgroups: comp.ivideodisc
Subject: Re: MEMORY CAPACITY OF A VIDEO DISK
Summary: analog, not digital
Message-ID: <42482@ut-emx.uucp>
Date: 14 Jan 91 04:12:20 GMT
References: <11678@j.cc.purdue.edu>
Sender: news@ut-emx.uucp
Reply-To: clouds@ccwf.cc.utexas.edu (Kathy Strong)
Lines: 26

In article <11678@j.cc.purdue.edu> zhou@brazil.psych.purdue.edu (Albert Zhou) 
writes:
>A while ago, I posted an article in another newsgroup asking about the
>memory capacity of laser disk. Currently, laser disks used by computers
>typically have a few hundred Meg bytes. However, according to my
>computation, if a laser disk stores uncompressed digitalized pictures,
>its memory capacity has to be much higher (consider a 90-minute movie.
>it needs to store 25x60x90 pictures). Does anyone know the mechanism
>of storing pictures in video disk?

Sorry, laserdiscs don't work that way. They do not store information 
digitally, but rather in an analog form. To answer your original question,
CAV (constant angular velocity) videodisks, the kind usually used in 
multimedia and interactive videodisk, hold 30 minutes (54,000 frames) of
video, while CLV (constant linear velocity) disks, more often used for
movies, hold 60 minutes (108,000 frames) of video per side.

--K
.

-- 
...........................................................................
:   Kathy Strong               :  "Try our Hubble-Rita: just one shot,     :
:  (Clouds moving slowly)      :   and everything's blurry"                :
:   clouds@ccwf.cc.utexas.edu  :                           --El Arroyo     :
:..........................................................................: