Posted by Alan Pemberton on 10/11/06 17:01

charles <charles@charleshope.demon.co.uk> wrote:

> I don't think the Soviets were involved in the development of SECAM, they
> were sold/given it after its use in France. But while it was used for
> tranmsision, PAL was used in the Soviet studios.

However, there was an extended period of consultation and development
during which the two nations worked towards a common standard which both
had agreed to use. But the final standard (called SECAM III) was an
optimisation of the original French SECAM standard and contained nothing
of the Russian NIIR proposal (sometimes called SECAM IV, though it does
not have sequential colour and the modulation is not FM but supressed
carrier double-sideband AM as in NTSC/PAL).

Colour services started simultaneously in Moscow and France in 1967.
SECAM III proved ideally suited to the long distribution paths
encountered in the USSR.

NTSC countries considered transcoding to and from SECAM in order to
continue using unmodified monochrome 525-line VTRs which many stations
had only just invested in. The bandwidth was sufficient for colour, and
the timebase stability, while insufficient for NTSC, was adequate for
the FM SECAM signal.

[FU set to utb as I filter out crosspostings and only came across this
thread by chance]

--
Alan Pemberton
Sheffield, South Yorkshire, England
To e-mail me directly, please visit
<http://www.pembers.freeserve.co.uk/index.html#Mail-me>

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