[opendtv] SECAM-like scheme used on first Ampex color VTRs ?
- From: Olivier Houot <olho_avatar_i@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 12 Dec 2011 23:50:58 +0100
Since some people here have quite encyclopedic knowledge regarding early
television, i will submit this rumor i've heard about to your wisdom.
It is said NTSC was too sensitive for early implementations of color
VTRs, and it therefore was converted to and from "SECAM" for recording.
If so, it probably only had the basic principal of sequential color in
common with the official french format, which was not even standardized
at the time.
It must have used 525/60 scanning format, and perhaps not even FM chroma
(i think early SECAM schemes have tried AM).
Also i am wondering if it would have used delay lines, or somehow tried
to read both current and previous lines using two heads working in
parallel.
On the other hand, perhaps someone has made a confusion between the
underlying FM modulation used in magnetic video recordings, and the FM
chroma of SECAM, and jumped to an erroneous conclusion.
Any clue?
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