Re: Video Converter for VHS to digital

In article <dsqrrk$18a$1@xxxxxxxxxxxxxxx>,
davem@xxxxxxxxx (Dave Martindale) wrote:

Bjorn Eithun <bjeit@xxxxxxxxx> writes:

I have also been considering buying a device like the ADVC 100/110 from
Canopus. BUT: Why not buy a digital camera with so called pass-through
conversion of analog to digital signals?

Are you going to digitize the output of an analog consumer VCR?

No, I am primarely planning on digitizing my own Hi8 tapes. I own a Sony
Hi8 VCR deck, the EV-9000E (European model), which I think was named
EV-7000 in the US, and may be also in Canada.

The video coming off the rotary head of any VCR has jittery timing,
because the head rotation rate speeds up and slows down slightly as the
servo systems adjust to keep the average head RPM correct and the
tape motion synchronized with the head rotation. This means that any
one scanline can be output a little before or after it should appear,
which in turn causes horizontal jitter in the picture.


Professional analog VCRs have timebase correctors. They digitize the
video coming from the head using a clock derived from the video itself,
so the clock speeds up and slows down along with the head. The
digitized data is saved in memory for a little while (a few lines), then
converted back to analog using a sample clock that is a fixed frequency
(or synced to incoming reference video). So you get stable video out.

Consumer VCRs lack timebase correctors, so for the best results
digitizing their output you want to feed the video through a TBC first.
Some external digitizer boxes also include a TBC. Do any of the video
cameras with passthrough inputs?

Dave

I doubt that the EV-9000E will create problems like these, mainly due to
the built in Time Base Corrector and other sophisticated electronics.
But I don't know for sure. I have not tried this as yet, but I think
that playing back the tapes in the EV-9000 through a digital camcorder
for digital conversion (pass-through), should render good results, in my
humble opinion the best available as regards Hi8 source tapes.

My question was: With such an upset, do I really need to worry about a
standalone device like a Canopus box? Wouldn't a digital camcorder do
the job just as well?

Regards,
Bjorn Eithun,
Oslo, Norway
.

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