d
MAJOR PROJECTS
Field Store Standards Converter
In 1976 Designs Department were authorised to start work on the initial
phases of the development of a digital field store standards converter
and this work continued up to August, when the major components of the
equipment
were
demonstrated.
Conversion,
in either direction at the
push of a button, was shown for monochrome signals and although only a
simple one field store converter has been built, parameters such as
picture resolution and noise level
in
the
presence
of
line
interpolation could be assessed.
Another activity demonstrated was
the successful realisation of a new
type of colour decoder using an
analogue
comb-filter.
It
has
promoted further work along similar
lines
for
PAL
coders
and
it was
concluded that the technique will
ensure high technical performance
even when the converter is operating
as a PAL to PAL synchroniser. These
major activities involved four
engineers and four lab technicians
from time to time, the equipment
being assembled in bay form to give
advance experience of practical
problems such as crosstalk. Since
August the full operational
specification has been agreed with
Television Projects Department; it
includes full remote control, fault
indication
and
facilities
for
correcting colour errors in the
incoming signal.
SPECIAL~STUDIES~ SECTION,
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During the course of the year
opportunities for incorporating new
techniques such as noise reduction
have been considered with Research
Department and liaison on the
theoretical requirements for
decoding methods, signal storage and
interpolation functions continues.
Further
details
of
individual
projects are given below under "Projects
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Equipment for Standards
Converter Design Study
in Progress".
Modern Source Synchronisation Methods
The development
has been taking
components are the
of new Nat10ck source synchronisation equipment which
place over recent years is now complete. The main
master oscillator, pulse generator and subcarrier
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