> Hi,
> I am searching for the povray pattern that is most suited to creating visual
> black and white noise similar to what old television screens could display
> without a signal. what are your advices?
>
>

The granite, agate or bumps patterns, properly scalled should gives good 
results. For the agate pattern, you'll need to provide a black to white 
color_map.
As those noise seems to tend to have few grays, I'd suggest a color_map 
similat to this:
color_map{[0.4 rgb 0][0.6 rgb 1]}

Change the transition range up or down to get darker or brighter patterns.
Broaden the transition range to reduce contrast, tighten it to increase it.



Alain

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