16 Jun
2002
16 Jun
'02
4:14 p.m.
Dave Woodman wrote:
The mechanism that was used in early TV sets to
achieve the
correction was rather interesting:- the set contained a glass block,
with an ultrasonic transducer at each end (one sending, the other?
well, no prizes for guessing!). The delay in the block was one
transmitted line so the output could be directly compared with the
following line. Ah, the wonders of old technology...
Old technology? Does that mean there's some newer version of
the standard PAL delay line that I wasn't previously aware of?
I thought all PAL sets (and video recorders?) used a glass delay
line in this manner.
--
John Honniball
coredump(a)gifford.co.uk