Hi,
ard_at_p850ug1.demon.co.uk (Tony Duell) said:
>
> UK PAL video equipment used to use a glass delay line as part of the PAL
> decoder. This was a 'mechanical' device -- piezo-electric transducers
> sent a pulse through the glass which was picked up about 64us (a little
> less -- just under 1 line time) later by a similar transducers. Old VCRS
> -- the better ones anyway -- used a 64us (exactly 1 line time) delay line
> to store a video line to be used if there was a dropout on the tape.
> Modern ones don't seem to bother :-(
>
> I have often wondered about using such delay lines for data storage...
Or building a replica EDSAC??
--
Cheers,
Stan Barr stanb_at_dial.pipex.com
The future was never like this!
Received on Sun Jun 13 2004 - 03:07:08 BST