Hmm,
I tried to keep calm, but.....
1) EVERY recording methode is limitied by the bandwidth the recording-media
provides. But you can't call it compression.
2) A very basic A/D rule:
- Each analog signal with frequency x, can be reproduced when sampled at
2x and played back with 2x.
Ie, you aren't trowing away any information here!
3) The bandwidth of tape is normaly smaller (with the exception of metal-tape)
than the bandwidth of CDs.
4) Vinyl has a higher bandwidht than CD, but I've yet to see an LP that uses
it's
full potential.
5) CDV IS NOT the combination of LDV and CD. The video on CDV is also digital.
LDV is analog.
6) CDs, LDs, LPs (vinyl) are all produced in a comparable way (pressing) (which
is a lot cheaper than producing a tape). However the way they are read are
all
different:
- CDs are read using a laser/opto-receiver combination that just needs to
detect
highs and lows. Nothing difficult here to produce.
- LPs (vinyl) are read using a small contact (the needle) that touches the
disc.
The needle vibrates and that signal is amplified. Hence you get the sound.
- LDVs are read in a simular way. The only thing that is different is the way
the information is read. (LDV uses a laser/opto-receiver combination).
AFAMMSM (As far as my memory serves me) the information on a LDV is stored
using somekind of modulation (as with VHS/BetaMax/VCC etc.)
7) The S/R depends on the number of bits used in digital recordings.
8) The S/R depends on the bandwidth of the media in analog recordings.
Cheers,
Ralph -> hoping that you see that you're trying to redifine things here!
[EMAIL PROTECTED] wrote:
>
> * JR Moore <[EMAIL PROTECTED]> on Mon, 01 May 2000
> | Yeah BUT, analog signals when recorded don't have a set size. You can't say
> | "1 minute of analog audio takes 5MB", you just can't. You can control the
> | amount of audio it holds by changing the speed.
>
> Say what? A CLV Laserdisc _always_ holds 60 minutes of analog video on the
> video track and 60 minutes of analog audio on the audio track, and the
> speed is constant (Constant Linear Velocity). A 60 minute cassette
> _always_ holds 30 minutes of analog music on a side, and the speed is
> constant. A T-120 VHS tape _always_ holds 120 minutes of analog video and
> 120 minutes of analog audio, and the speed is constant. In all three
> cases, the media density is constant. Assuming that the 5MB per minute of
> audio figure is accurate for a given media format, I can say with certainty
> that 1 minute of analog audio always requires 5MB for that type of media.
>
> Sony deliberately engineered Compact Disc to use the same mechanisms as
> Laserdisc. The media densities are identical. That is how we got CDV, a
> Compact Disc with both CD-DA and Laserdisc tracks. And the fact remains:
> CD-DA uses less physical space on the media for the same length of signal.
> --
> Rat <[EMAIL PROTECTED]> \ Warning: pregnant women, the elderly, and
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>
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