TBC/NR jitter in S-VHS ET JVC VCR

[Dimitri P.]

I have a JVC HR-S9911U S-VHS-ET VCR with Digipure TBC/NR. When I enable the
TBC/NR there's a significant noise reduction and overall improvement of the
picture during playback. However, when the TBC/NR is enabled, the picture
suffers from a noticeably momentary vertical jitter (quarter inch up-down)
at irregular, but short intervals. I tried many tapes, old, new, expensive
and cheap ones - the results are all the same.

I brought the VCR for repair at a shop, adjusted the back tension, but the
problem persists. I don't think the problem is mechanical, as it only
appears to be when the TBC is enabled.

As a former TV producer I recorded some archives on S-VHS-ET and now would
like to transfer them to DVD without the inherent noise of SVHS-ET. The
picture quality with the TBC/NR on is amazing and the transfer would be
perfect, only if the jitter wasn't present.

Are there any suggestions? Is the TBC circuitry faulty? If yes, what the
shop has to check for? Is anyone else experiencing this jitter during
playback when the TBC/NR is on?

Thanks

[TheFug.]

Post by Dimitri P.
I have a JVC HR-S9911U S-VHS-ET VCR with Digipure TBC/NR. When I enable the
TBC/NR there's a significant noise reduction and overall improvement of the
picture during playback. However, when the TBC/NR is enabled, the picture
suffers from a noticeably momentary vertical jitter (quarter inch up-down)
at irregular, but short intervals. I tried many tapes, old, new, expensive
and cheap ones - the results are all the same.
I brought the VCR for repair at a shop, adjusted the back tension, but the
problem persists. I don't think the problem is mechanical, as it only
appears to be when the TBC is enabled.
As a former TV producer I recorded some archives on S-VHS-ET and now would
like to transfer them to DVD without the inherent noise of SVHS-ET. The
picture quality with the TBC/NR on is amazing and the transfer would be
perfect, only if the jitter wasn't present.
Are there any suggestions? Is the TBC circuitry faulty? If yes, what the
shop has to check for? Is anyone else experiencing this jitter during
playback when the TBC/NR is on?
Thanks

I had some same experiences, with my JVC recorder, but had this with
different tapes, and also sometimes in combination with Macrovision
protected tapes, instead of using TBC i used then the other function,
stabelizer, my recorder has, this gave better results, although not
perfect...
-- The Fug

[TheFug.]

Post by TheFug.

Post by Dimitri P.
I have a JVC HR-S9911U S-VHS-ET VCR with Digipure TBC/NR. When I enable the
TBC/NR there's a significant noise reduction and overall improvement of the
picture during playback. However, when the TBC/NR is enabled, the picture
suffers from a noticeably momentary vertical jitter (quarter inch up-down)
at irregular, but short intervals. I tried many tapes, old, new, expensive
and cheap ones - the results are all the same.
I brought the VCR for repair at a shop, adjusted the back tension, but the
problem persists. I don't think the problem is mechanical, as it only
appears to be when the TBC is enabled.
As a former TV producer I recorded some archives on S-VHS-ET and now would
like to transfer them to DVD without the inherent noise of SVHS-ET. The
picture quality with the TBC/NR on is amazing and the transfer would be
perfect, only if the jitter wasn't present.
Are there any suggestions? Is the TBC circuitry faulty? If yes, what the
shop has to check for? Is anyone else experiencing this jitter during
playback when the TBC/NR is on?
Thanks

I had some same experiences, with my JVC recorder, but had this with
different tapes, and also sometimes in combination with Macrovision
protected tapes, instead of using TBC i used then the other function,
stabelizer, my recorder has, this gave better results, although not
perfect...
-- The Fug

Sorry, i did not mention this: I cancled the Macrovision "effect" with
the button "trick" on the ADVC100, for capturing VHS tapes with
Macrovision on it.
btw ET is a long play speed ? what about, if you first record these
tapes onto miniDV via s-video or composite video in ? and later
capture by Firewire ?
btw. maybe your troubles only exit out of s-video output, and not over
the composite video out, had some strange experiences with that too !
-- The Fug

[Dimitri P.]

No, nothing to do with macrovision since these tapes were created by me.

Post by TheFug.
btw ET is a long play speed ?

ET is a mode where the VCR allows you to record S-VHS signal on VHS tapes.

Post by TheFug.
what about, if you first record these tapes onto miniDV via s-video or
composite video in ? and later capture by Firewire ?

If I do that then I'll have a jittery miniDV and a jittery capture over
firewire. The jitter is on the playback regardless if I output on miniDV or
directly to DVD. I'll take the vcrto the shopr because I think its a
defect. Thanks

[UCLAN]

Post by Dimitri P.

Post by TheFug.
btw ET is a long play speed ?

ET is a mode where the VCR allows you to record S-VHS signal on VHS tapes.

No, that is *EP* as in SVHS-EP. ET is indeed a long play speed.
[6 hours on a NTSC T-120 tape.)

[Mike S.]

Post by UCLAN

Post by Dimitri P.

Post by TheFug.
btw ET is a long play speed ?

ET is a mode where the VCR allows you to record S-VHS signal on VHS tapes.

No, that is *EP* as in SVHS-EP. ET is indeed a long play speed.
[6 hours on a NTSC T-120 tape.)

No, you have it backwards. The OP was correct.

VHS-EP (extended PLAY) means a long play speed.

S-VHS ET (EXPANSION technology) mimics the extended luminance bandwidth of
SVHS on standard tape.

[Deke]

)

Post by Dimitri P.
I have a JVC HR-S9911U S-VHS-ET VCR with Digipure TBC/NR. When I enable the
TBC/NR there's a significant noise reduction and overall improvement of the
picture during playback. However, when the TBC/NR is enabled, the picture
suffers from a noticeably momentary vertical jitter (quarter inch up-down)
at irregular, but short intervals. I tried many tapes, old, new, expensive
and cheap ones - the results are all the same.
I brought the VCR for repair at a shop, adjusted the back tension, but the
problem persists. I don't think the problem is mechanical, as it only
appears to be when the TBC is enabled.
As a former TV producer I recorded some archives on S-VHS-ET and now would
like to transfer them to DVD without the inherent noise of SVHS-ET. The
picture quality with the TBC/NR on is amazing and the transfer would be
perfect, only if the jitter wasn't present.
Are there any suggestions? Is the TBC circuitry faulty? If yes, what the
shop has to check for? Is anyone else experiencing this jitter during
playback when the TBC/NR is on?
Thanks

First, let me say that TBC/NR wont make a silk purse out of a sows ear. By
recording S-video on a regular vhs tape using the ET feature, you introduced
some quality reductions into the recording from the beginning.
Since these were originally home recording, it cant be a macrovision
problem.
It might be an up-conversion problem, as in viewing a
standard definition tape on a hidef tv, but I doubt it.
This a common problem usually associated with older tapes of poorer quality.
Since you were a TV producer, I would suggest that you find a professional
video studio, or TV station, and see if their heavy duty time base
correction units will do a better job than your home unit.
Or just record the shows without the jitter, with reduced quality as the
tradeoff.

D