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
Received on Sun Jun 16 2002 - 14:00:12 BST