Posted by Bill Vermillion on 01/22/07 17:35

In article <459e036c$1_1@glkas0286.greenlnk.net>,
M.I.5� <no.one@no.where.NO_SPAM.co.uk> wrote:
>
>"JoeBloe" <joebloe@thebarattheendoftheuniverse.org> wrote in message
>news:ii8rp29a07pigd5m63s6vl6tp7d34f82hn@4ax.com...
>> On Thu, 4 Jan 2007 13:14:17 -0000, "M.I.5�"
>> <no.one@no.where.NO_SPAM.co.uk> Gave us:

>>>But that would have been an entirely new format. Same size disk
>>>maybe, but a new format all the same.

>> You don't get it. All optical disc technologies evolve.

>> DVDs right now have different res previews and extras than the film
>> segment, and it peels off the disc at a different bit rate.

>Virtually all pre-mastered DVD are read at a variable it rate.
>They read at a low rate for relatively static images increasing
>the rate where there is much action. This helps extend the
>playing time.

>> What I mentioned would be no harder than that, and using CLV,
>> very little would need to be changed. DVDs are read at varying
>> RPM rates as the disc progresses. An LD could be read the same
>> way, providing the varying rate and best use of the optical
>> data area real estate.

>LDs could be mastered in CAV or CLV modes, the latter playing
>at varying RPMs. The only downside was that the ability to have
>steady freeze frame was lost (though later players had a frame
>store to overcome the limitiation).

Actually almost all of the LD players that talked about 'freeze
frame' were actually 'freeze field' displaying only 1/2 the
resolution you'd perceive from a full frame. The Pioneer 8000 -
and industrial machine was one of the few - if not the only - that
did a true freeze frame. I don't recall what the Sony 2000 and
3000 series did - but those were impressive machines. For a still
on the screen while they seeked, they'd actually place still frames
as varying places across the disk while the heads seeked to the
next motion section. Those were true industrial strength machines
and the demo I was ISTR was intended for tank-training for the
military. The 3000 model designation was a bit less than the
price :-)

....

>> Maybe we should go back to piano roll methods. That's what a
>> holocube is essentially.

>One of the oldest digital formats. I wonder if Alphonse Gavioli
>knew what he was starting?

But piano rolls used data that was only 1 bit per each note.
Probably the most inefficent 'digital' format ever used. :-)

Bill
--
Bill Vermillion - bv @ wjv . com

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