Re: PAL Video

[P3D Joerg Meyer Inf.] <jmeyer@xxxxxxxxxxxxxx>]

On Wed, 6 Nov 1996 14:20:55 -0600 Reiner Petras <ReiPetras@xxxxxxx> wrote:

>I believe someone once told me that PAL requires the storage of a line of
>video information for the error correction to work. If this is correct,
>do you recall how this was stored in the days before digital memories?

A PAL circuit contains a delay line, which delays the signal
of a line until the next line is transmitted. The two signals
are superimposed and thus compensate for errors due to
transmission interference. This procedure is serial, so no
storage device is required.

Joerg

    _V_      |  Joerg Meyer ----- University of Kaiserslautern, Germany
   /   \     |  Department of Computer Science, Computer Graphics Group
   |O O|     |  mailto:jmeyer@xxxxxxxxxxxxxxxxxxxx --------------------
ooO--U--Ooo  |  http://davinci.informatik.uni-kl.de/~jmeyer -----------


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