16 Jun
2002
16 Jun
'02
2 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...
One of the early British TV companies before WWII was using a ultrasonic
transducer to modulate a optical gate. The optical gate was one scan
line
long and rotating mirrors were used to direct the output of the gate on
to a screen similar to a projection TV.
--
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html