PROJECTS COMPLETED
Colour Separation Overlay with Coded Waveforms
A feasibility study into improved methods of processing coded PAL
signals to produce high quality key waveforms for CSO was duly completed
in the summer of 1977, and a report issued. Unfortunately the hoped for
improvements over existing techniques were not realisable without
incurring serious penalties in terms of system cost and complexity.
However, a great deal of useful information related to the fundamental
problems involved was gathered, and will serve as a basis for further
work.
New 6dB Video Distribution Amplifier (4U chassis)
The design of a new general purpose video amplifier providing 6 outputs
has been completed along with the associated equalisation and delay
units. A pre-production batch was manufactured in Designs Department
and tandem tests revealed that a high performance can be expected when
in
service.
Large
scale
manufacture,
in
Equipment
Department,
commenced in December of this year and will be continued throughout
1978.
New 6dB Pulse Distribution Amplifier (4U chassis)
This new design can simultaneously drive up to ten distribution circuits
carrying television pulses or colour subcarrier. Compared with the old
imperial version, the frequency response and output isolation have been
considerably improved. These parameters should cease to be a problem
under
operational
conditions.
The amplifier, unlike its predecessor,
makes provision for the use of input equalisation when required. The
design phase was completed in the autumn of this year and manufacturing
information will be available to Equipment Department in the Spring of
1978. Production units should be available in the same year.
New 6dB RGB Distribution Amplifier (4U chassis)
This unit provides three independant amplifier chains each one of which
is capable of driving four circuits. Although designed for RGB use, the
performance is such that it can be used as a twelve output composite
video
DA
by
paralleling
the
inputs.
Like
the
pulse distribution
amplifier the design phase was completed in the autumn of this year, and
manufacture should commence in Equipment Department in 1978.
The New Outside Broadcast Vision Mixer
Liaison with Equipment Department: Manufacture of the first batch of
mixers has continued throughout the year with the completion, and
exceptance by Studio Capital Projects Department, of two complete
systems. Designs Department engineers have worked closely with their
colleagues in Equipment Department on the rationalisation of test
procedures and completion of relevant documentation. It is anticipated
that Designs Department's involvement will be minimal on subsequent
batches.
Local Control Facilities: At the request of operational staff a local
control panel has been designed that permits all the essential functions
of the mixer to be controlled from the engineering position of the
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