Is this some sort of TBC ?

[dellsam34]

http://www.ebay.com/itm/Latest-CopiAll-Digital-Video-Stabilizer-DPX-7001-DP-X7001-Best.../190862754507?

[mike20021969]

Is the seller keeping schtum?

[Brad]

In February I sent the seller a message asking whether "jitter" in the posting is referring to vertical or horizontal. I figured he should know, since the listing seems quite technical (identifying the individual chips, etc.) but apparently he is just quoting specs about what it actually does.

Dear aceman4000,

Hi, the listing states that the unit corrects jitter. By this do you mean vertical jitter (picture jumping) or horizontal jitter (waviness and small wiggling lines)?

Thanks,
Brad

Hi Brad,

The manufacture does not specify the type of jitter that is corrected by the unit.
So, we are not sure about the nature of the correction.
The unit digitizes the analog video signal, performs a bit-by-bit correction, and converts the signal back to an analog form.
However, we don't know what kind of jitter correction is done during the digital correction process.

Despite the listing's hyperbolic suggestions that it will fix every video error ever, user reviews I've seen are quite mixed.

[usually_quiet]

The description says it is a digital video stabilizer. That phrase is normally code for analog copy protection remover. Such devices are not TBCs.

[dellsam34]

Is the seller keeping schtum?

I asked the seller and he gave me the run around, My guess is, it is just a macrovision remover and it does nothing to enhance the video quality if not worsening it by pumping up saturation, contrast and sharpness.

[betwixt]

Speaking from a technical background - it's a composite decoder and re-encoder but not a TBC. It can not remove artifacts or jitter in the original video but the output *MAY* be a jitter free copy of the input video *WITH* jitter. In other words it may produce output which is itself free of timing errors but the video in it will still wobbles!

To be a TBC it has to correct the waveform in the time domain, either by introducing an additional delay in the signal so it all aligns with the most delayed part or, more commonly, the whole video frame is digitized to memory using the jittery syncs as timing references to write the data then a clean timing reference to play it back. Typically this requires dual-ported memory or interleaved memory and I see no evidence of that in the photographs.

Brian.

[pandy]

SAA7114 have some limited horizontal TBC very similar to other consumer chips on market - same family is used in USB capture devices and some capture cards. Perhaps with correct software it can be able to be some limited TBC but don't expect miracles - same or better results can be achieved on PC with BT878 compliant card and software (functionally Bt878 and later compliant CX series allow to grab horizontal sync pulses and as such perform real horizontal TBC).

[PuzZLeR]

I guess I could bet $189.95 USD that it's a MV remover + (maybe) comb filter. It's not the money, it's my reluctance to support any scammer if the seller is one. (I said IF, however a fake ezcap included in the bundle, albiet "free-of-charge", is rather counter productive IMO regarding credibility.)

I doubt it has any other TBC features beyond removal of MV, and also doubt any quality proc amp, encoder, AGC correction features either, which would be quite useful.

If the "comb filter" is any good, I would be interested though.

[Brad]

The listing only references the comb filter by quoting Philips/NXP/Trident's description of the SAA7114H. The chip is from 2000, according to the prelim data sheet. It's 2D adaptive "2/4-line". The best 2D comb filters are adaptive 5-line, and they certainly aren't old enough to drive a car yet.

You have an AVT-8710, so you've seen the performance of the SAA7114H's comb filter if you've ever fed it composite. (All known revisions of the 8710 listed in the breakdown someone posted use the same input chip.) There are some different settings for it available to the device maker, but I doubt they adjusted it much.