TBC-1000 & Generic TBC Questions

[TBoneit]

If in the wrong forum please move.

I've been looking at the TBC-1000 based on my reading here, my guess is that one of the differences between it and the less expensive card is that it has an audio and video distribution amplifier to support the 4 outputs.?

I've read some threads on this site that suggest a TBC may cure my problems, including https://www.videohelp.com/forum/viewtopic.php?t=239205 by gshelley61 titled "Hardware Video Processors and Filters"

Generic TBC questions:

1. Will it cure the flagging at the top of the screen on many tapes?
2. Some of my tapes show a waving side to side near the bottom 1/3 of the screen, will a TBC help?
3. Is there any sites that show before and after pictures to show what can be expected from a TBC?
4. what does it mean when they say: 8-bit video resolution- 4:2:2 sampling rate DP <1 Degree – DG less than 2%, Especially the 4:2:2

Call me a noob about TBCs

Many Thanks

[gshelley61]

TBC's can usually cure the problems you described, but not with 100% certainty. It depends on the specific tape and how far out of spec the sync pulse timing signal is.

The 8-bit 4:2:2 sampling rate describes a specific method and quality level of digital sampling of the vdeo image colorspace. It could be 10-bit, for example. DV converters and cameras sample using a 4:1:1 pattern. Here's a very good (and short) explanation of digital colorspace sampling...

http://www.studio1productions.com/Articles/411samp.htm

[TBoneit]

Great, I'll look at that link now. OK, looked at it and if I understand it the 4:2:2 is better. I'm thus assuming the the TBC must digitize the signal, do it's magic, and then return it to analog? Or where does the 4:2:2 comne into play?

Then it looks like the TBC-1000 is the way to go.

Thanks a lot.

[gshelley61]

That's correct. TBC's digitally sample the video, correct the sync pulse signal, then output analog video.

4:2:2 is theoretically better than 4:1:1 sampling, but keep in mind that all DV based equipment, including $50,000 professional video cameras, sample in the 4:1:1 colorspace. It would be very difficult for you to tell the difference in actual practice.

[ronnylov]

I don't like the digitizing and then going back to analogue and after that we capture to digitize it again. It would be better if there was a TBC that could capture directly without making it analogue again. Does it exist any capture card with built-in full frame TBC so we can skip this extra DA-AD conversion?

[lordsmurf]

I wouldn't really call the TBC "digital", at least not in the same terms as a capture is "digital". Technically, yes. Identically, no.

There will not be a quality loss, which I can guess as your motives.

To some degree, even all VCRs are "digital" these days.

[gshelley61]

Correct. For example, nearly all of today's Y/C comb filters are digital. There is really no visible degradation of the video signal when using a good quality TBC. On the contrary, TBC's stabilize and in many cases clean up the signal, providing a rock solid video image for you to capture... without dropped frames or A/V sync problems. TBC's have been a very important part of the broadcast and professional editing video signal chain for many years. If they reduced the quality of the image, they would not be acceptable for use in those environments.