Quantcast What are the different types of external TBCs? - digitalFAQ Forum
  #1  
07-11-2020, 06:46 AM
mbassiouny mbassiouny is offline
Free Member
 
Join Date: Jul 2020
Posts: 4
Thanked 0 Times in 0 Posts
Hi there,

I know what a tbc is when it comes to the ones connected to vcr like datavideo models or av toolbox ones.

Recently, I saw some "weird" TBC/frame synchronizers on ebay that has a different input/output ports than the usual rca connectors used so I was wondering for what purpose are those used and is there a convertor to use them with a VCR?

Here are the ones I'm curious about:

Miranda ASD-221i
- https://www.ebay.com/itm/183878786490

Beck TBC RMT-2 Frame Synchronizer
- https://www.ebay.com/itm/143434190378

Zaxcom video HCP400 REV B TBC Time Base Consoles
- https://www.ebay.com/itm/122357873892

- backup screenshots of the 3 listings in case the ebay link dies: https://imgur.com/a/tNfn5sR

I would appreciate if someone can explain a bit about those

Thanks in advance
Reply With Quote
Someday, 12:01 PM
admin's Avatar
Ads / Sponsors
 
Join Date: ∞
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #2  
07-12-2020, 03:30 AM
jwillis84's Avatar
jwillis84 jwillis84 is offline
Premium Member
 
Join Date: Aug 2017
Location: College Station, TX
Posts: 765
Thanked 172 Times in 141 Posts
The Miranda is a modular card that goes into a rack mounted broadcast facility chassis. It would work in concert with a system for acquiring and decoding and correcting an RF signal into something that could be recombined with other video signals at the production facility then re-modulated and broadcast.

It is not suitable for the home user.

The Beck TBC RMT-2 is a "remote console" it is not a TBC. Its meant to bring the controls away from a rack mounted chassis so that the controls could be bolted into a desk or console like on the Star Ship Enterprise for centralized management.

Its not what your looking for and really is of no use without the actual time base correction equipment and system that hosts it in a big rack.

The Zaxcom video HCP400 REV B TBC Time Base Consoles is not a TBC. It is also a remote console where the control cables from the TBC rack mounted system are brought out and plugged into a central dash for the producers to manage the equipment.

Its also not what your looking for and of no real use.

There is a vast difference between Consumer / Home user "stand alone" TBC devices like the datavideo or avtools boxes and the Gigantor sized huffing and puffing TBCs as big as a house that fit in the broadcast production facilities.

There are probably more of those 1950's TBC systems laying around in warehouses just never carted off to the landfill that will continue to show up on eBay. Their smaller "remote consoles" are closer in size to the "tiny" datavideo and avtools boxes from the turn of the Century. So its easier to confuse them with the Huge dinosaurs the rear cables were meant to lead back to.

Honestly there are only a small hand full of Consumer grade models and they were only made in the mid to late 1990's before they started incorporating them into both high end VCRs and DVD recorders.

The stand alone models were never popular due to cost and cable complexity. For most people casually doing transfers the VCRs and Tapes were still in good condition and TBCs were mostly an expensive after thought. Its only much later when things began to rot and VCRs were run to death and began to fall apart that TBCs got popular.

After VCRs stopped being made, things exacerbated.. and TBCs partnered with rickety VCRs .. achieved near mythological status.. and prices shot to the moon.

Some PC capture cards also incorporated TBC circuits and processors into their design, making the stand alone models redundant.. but people still trade the stand alone TBCs. Mostly because those cards are also not well documented and the ones that are known are closely held and not discussed very much.
Reply With Quote
  #3  
07-12-2020, 07:02 AM
dpalomaki dpalomaki is offline
Free Member
 
Join Date: Feb 2014
Location: VA
Posts: 989
Thanked 213 Times in 183 Posts
To add a bit of general information. "Frame Synchronizers" are used to bring independent video signals to a common time base (i.e., each frame and scan line in the signals starts at the same time). This is necessary for switching between two or more signal sources, as is done in broadcast situations or in linear video editing of input from more than one tape player. If the video sources are not synchronized you get a glitch at the switching point.

Many frame synchronizers expect good input video signal and thus may not prove effective in correcting time base errors within a sloppy input signal.

At the generally affordable consumer/prosumer level video mixers (e.g., the Videonics MX-1) typically contain frame synchronizers. Because they rebuild the sync signals the process can clean up weak sync and Macrovision on the input video signal, provided that the device can read the input signal - and that can be problematic if the input signal is really bad.
Reply With Quote
  #4  
07-12-2020, 02:46 PM
latreche34 latreche34 is online now
Free Member
 
Join Date: Dec 2015
Posts: 868
Thanked 110 Times in 104 Posts
I just want to add that in general a frame synchronizer should always follow a TBC, In capture devices they can add or drop frames to keep the audio in sync with the video.
Reply With Quote
  #5  
07-12-2020, 04:23 PM
lordsmurf's Avatar
lordsmurf lordsmurf is online now
Site Staff | Video
 
Join Date: Dec 2002
Posts: 9,479
Thanked 1,574 Times in 1,374 Posts
With very few exceptions, what you see on eBay is mostly crap. It's a video dumping ground more than not.
- Many sellers lie; sometimes knowingly, sometimes not.
- Many buyers are newbies, suckers, also don't know what they're buying, until it's too late.

Almost all of that stuff comes from estate sales, warehouse/storage auctions, etc. It's been kept in horrible conditions. I recently acquired something, for TBC research, that smelled like a mushroom farted. The smell will saturate a room worse than cigarettes.

You must be careful.

All of that stuff linked to is cast-off garbage, no real use. Not to broadcasters or studios. Not to anybody conveting consumer analog tapes.

At best, that Miranda card may be useful for TBC R&D. The others should probably be recycled for precious metals.

The prices are laughably ridiculous.

- Did my advice help you? Then become a Premium Member and support this site.
- Find television shows, cartoons, DVDs and Blu-ray releases at the TVPast forums.
Reply With Quote
  #6  
07-14-2020, 12:34 PM
mbassiouny mbassiouny is offline
Free Member
 
Join Date: Jul 2020
Posts: 4
Thanked 0 Times in 0 Posts
Wow, Thanks a lot guys for the good answers and details specially the long detailed explanation by jwillis84. I really appreciate your time guys

Also, I posted this in another thread too, but since it's the same topic, may I ask you guys what you think of those:

Prospec japanese DVE TBC devices
https://translate.google.com/transla...omparison.html

Is this another "fake/commercial" usage of the term TBC?
Reply With Quote
  #7  
07-19-2020, 11:54 PM
lordsmurf's Avatar
lordsmurf lordsmurf is online now
Site Staff | Video
 
Join Date: Dec 2002
Posts: 9,479
Thanked 1,574 Times in 1,374 Posts
Quote:
Originally Posted by mbassiouny View Post
Also, I posted this in another thread too, but since it's the same topic, may I ask you guys what you think of those:

Prospec japanese DVE TBC devices
https://translate.google.com/transla...omparison.html

Is this another "fake/commercial" usage of the term TBC?
I answered the other thread.
But again: Yes, that appears to be bastardized use of "TBC". What I see there is NOT a TBC whatsoever, just one of those cheap "copy protection remover" devices. I actually saw some eBay auctions (not current) than specifically disclaimed that it was not a TBC.

- Did my advice help you? Then become a Premium Member and support this site.
- Find television shows, cartoons, DVDs and Blu-ray releases at the TVPast forums.
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Different types of noise removal for video? yukukuhi Restore, Filter, Improve Quality 25 10-27-2018 10:14 PM
TBCs going end of life, no more new AVToolbox! digitap General Discussion 5 03-27-2018 11:54 PM
Advices on buying VCR for various VHS types MadMatt Capture, Record, Transfer 1 01-09-2013 12:59 AM
Verbatim DL Types & Burn Speeds? Altek Blank Media 1 03-29-2009 03:35 AM
Types of Copyprotection Tom_n_Jonna Restore, Filter, Improve Quality 2 01-19-2006 08:23 AM

Thread Tools



 
All times are GMT -5. The time now is 12:40 AM