> > Regarding converting from digital to analogue and sending that analogue signal into > the laserdisc player's laser pickup: that was a semi-serious comment, as evidenced by > the ' ' at the end of the sentence. What it meant was that if a digital copy of the > original analogue data could be converted back to analogue and played out through a > laserdisc player, then we'd have a working conversion process.> > > But the same applies to a capture. As soon as it is digital, it isnt the same like > the original anymore. The argument to be able to recreate a LD and "press" it again > is weak and nonsense, as we cant do this process anymore. What remains is, how you > feed the hardware and since this process will be a analog-digital-analog conversion > again and it doesnt matter how you do it, be it like the devs intend to do or be it a > capture, the argument is pointless. Yes, the intended way would be in theory maybe > more accurate, but it is way more "pain in the ass" to setup, for a result that you > cannot see with your eyes or hear with your ears. >
No it doesn't apply to capture. Video capture is NOT reversible, not even theoretically. It was never designed to be reversible. Can you make LD data from digital video? Yes, but you would not be making a construction of the original signal. This is because:
1. The video demodulation is imperfect 2. The comb filter changes the picture 3. Nuances in timing are completely gone 4. Phase information is distorted 5. Phases of the colorburst could be inverted 6. The equalizing pulses will not be preserved at all.
ADA conversion on the other hand is theoretically perfect so long as the signal is bandlimited (which it is). In practice there are some concerns:
1. The input needs to be properly filtered to avoid aliasing 2. Some noise is introduced (which, according to us both, is a total nonissue in this case). 3. Some phase distortion depending on the anti-aliasing filter.
And that's about it. Do you see the difference here? Do you see how capturing video removes information NOT characteristic of the video itself but is characteristic of the original medium?
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