[tig] E to E
Thu Mar 18 23:18:52 GMT 2004
My understanding is that the full signal 'processing' is being applied
AAV Digital Pictures
Martin Euredjian wrote:
>thanks to Hans Lehman for supporting the TIG.
>Today I had an interesting revelation.
>We were looking at material playing back off a Sony HDCAM deck. I think it
>was an F500. Then, we switched to my OmniGen test signal generator, E-to-E
>through the machine, to look at various test patterns. One of those was a
>zone plate (very useful signal!). To my surprise, the aliasing and
>artifacts I saw were way beyond what I'm used to. It took a little bit to
>sink-in and realize that the only variable here was the tape deck. We
>bypassed the deck and all extraneous artifacts went away. All of them!
>So... E-to-E on these decks seems to be seriously damaging of the signal.
>If I had to venture a guess, it seems that the horizontal downsampling (to
>1440) and, maybe even word width reduction (to 8 bits) is part and parcel of
>E-to-E. Can anyone confirm or deny? Did we have a broken machine? Did we
>have a setting in the wrong place?
>BTW, don't bother trying to see this on a BVM-D24 or BVM-D32, you won't be
>able to see what I'm talking about due to the frequency response and
>eCinema Systems, Inc.
>martin at ecinemasys.com
>ecinema at ieee.org
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