Laser disc technical info?

[NEO14]

Hey everybody,
I was just wondering, what exactly is a Laserdisc? Mpeg1 or mpeg2? Resolution? Bitrate? Are they on CDs? How do they compare (quality wise) with dvds and vcds. I have never seen one. Just curious.
See ya.

[musher70]

Got lots of those, are sure really what they are, but u cant get
them anymore anyway really anyway,they put out 425 lines
of resolution, very similar to a laserdisc, also dolby digital out
put on most of the later players...better than dvd in a way, but
not really...

[Faceman101]

I always wanted to know myself also.

They are like cds, but the size of records. They have a higher quality look than VHS, but not near DVD.

If anyone has any technical links, I'd love to see them. When I did a search a while back all I got was basic stuff. Nothing like, what format, how they capped and then pressed, etc.

[BJ_M]

Optical laser disks have two standard formats: CAV (Constant Angular Velocity) and CLV (Constant Linear Velocity).
CAV is similar to floppy disk formats. The tracks are concentric rings, each containing a number of sectors- except the sectors are called "frames" or "blocks." The CAV format wastes a great deal of space. The outside tracks are longer, but they contain the same number of blocks as the shorter inside tracks. However, CAV is easier to program for read-write access, and some laser video players use this method because it permits "freeze-frame."
CLV is a spiral format, much like a phonograph record. All the blocks in CLV are equidistant along one long spiral. So there are three times as many blocks per track at the outer edge as there are towards the center.

laser disks are still aviable and still being made for special purposes , i get about 100 laser disks made each year still, but the cost has really gone up and the number of companies doing it has gone way down ..


how its made is that we send them a 29.97 NDF or 30NDF d-beta tape and they make us first a glass master , this glass disk is perfectly playable and if only one copy is needed, thats all tht is required. there are 43,500 video frames on each side of a disk

[topsaf]

L/D are about the same size as an LP Vinyl Record.
Data is stored in an Analogue format not Digital like DVD.

In a way it is better because there is no Digital Artifacts, but overall not quite as sharp a picture as DVD. Especially now that DVD encoding has almost been perfected.

Sound was DD 5.1 and there were hundreds of movies released. Multiformat playes that play LD/DVD are still availible and it is still possible to buy LD movies over the net but no new releases for quiye some time.

The 'original' Home Cinema format.

[kitty]

This guide has some good info on laserdisc specs:
http://www.vcdhelp.com/forum/viewtopic.php?t=94382