INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Time Base Correction Problem.

Time Base Correction Problem.

(OP)
I am really struggling with this problem.

I temporarily borrowed a JVC SR-VS30U S-VHS to MiniDV Combo Deck to make a digital copy of an old VHS home video. The copy was fine, a nice clean version of the original.

I have some other old tapes so, using my own digital deck, I decided to set up to make my own copies. The setup is as follows:

JVC HR-S2913U S-VHS to a DataVideo TBC-1000 Time Base Corrector to a Sony DSR-11 to a Sony PVM-14L2 Video Monitor.

The copies are coming out distorted. I get waving verticals, see this link for an example:

http://www.videonics.com/graphics/mixing/time-base-errors-x2.gif

The waving verticals were REALLY bad before I introduced the TBC. Now they are slight but they are still there.

Notes:
When I copy a new VHS tape (like a movie from Blockbuster) the picture is fine.
The time base corrector also has full frame stabilization.
When I take the digital deck out of the setup, and simply play the tape on the monitor, I still see distortion (ie; the deck is not causing the problem).

Could it be that the TBC is simply unable to handle the poor video signal coming from the old tape?
If so, why was the combo deck able to produce a good copy?
Looking at the specs on the combo deck - it doesnt even have TBC.
What does the combo deck have that I dont have?

RE: Time Base Correction Problem.

(OP)
I solved the problem. The JVC combo deck does have TBC and 4MB Frame Memory but also something called DigiPure Technology - apparently this is supposed to kick ass when you are transferring old tapes. It looks like only JVC vcrs have it.

I broke down and just ordered a JVC HR-S9911 S-VHS unit for $300USD, it has the Digipure Technology. I will hook this up to my DRS-11 along with the TBC-1000. This is about the best I can do for VHS tape copying at the pro-sumer level.

Check out this link - it has alot of info on this topic :
http://www.videohelp.com/forum/view...6&highlight=tbc

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close