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Posted by M.I.5 on 01/04/07 13:14
"JoeBloe" <joebloe@thebarattheendoftheuniverse.org> wrote in message
news:hhtpp29aid17cssudgvkbt145qi58v0p8k@4ax.com...
> On Thu, 4 Jan 2007 09:29:06 -0000, "M.I.5"
> <no.one@no.where.NO_SPAM.co.uk> Gave us:
>
>>Having said that, the Laser Disc probably represented the pinnacle of
>>domestic recorded quality at the time it was introduced. However, it was
>>forever constrained because of the analogue recording format which limited
>>its resolution to that of the PAL or NTSC colour format respectively.
>
>
> So what? That was virtually all that was available as display
> devices at the time. Even the ultra rich didn't have high res or
> progressive scan yet. The military... maybe.
>
> So "forever constrained"? Naw.... We would have digitized it by
> now, and the new would still have read the old discs. Also, imagine
> the data rates one could obtain from the outer regions of the disc.
> The high data rate high res stuff would be out there, and the low res
> previews, etc. would be in at the hub.
>
But that would have been an entirely new format. Same size disk maybe, but
a new format all the same. Similar to the ability of DVD players to play
CDs. But no-one has suggested that they are the same format (even though
they are far closer than most people imagine).
> The problem with LD was the form factor.
>
I fail to see why, especially as the market was well used to similar sized
disks for audio recordings. Why would they expect video records to be
smaller? When I was in the retail market, the only thing that made
potential customers buy a VHS machine instead of the laser disc really was
the inability to record on the latter. If it could have done that, it would
have displaced VHS as the de facto video medium.
> LD is too huge, too bulky, and it presents the hardware designers
> with too many technical hurdles to make good gear for it. The wobble
> at the edge of a twelve inch platter can be huge.
But nevertheless, it survived for a very long time given the small market
penetration and the technical hurdles which were clearly overcome. The
wobble at the outer edge of the platter would be exactly the same as the
wobble at the inner edge for any given disk. It is entirely a function of
how off centre the hole in the middle is and masalignments in the clamping.
The same issue affects CDs and DVDs though both of these have deliberate
wobbling of the track.
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