Picture noise when adjusting speed?

Hello all.
When I change the speed of any clip either slowing it down or speeding it up it results what can only be described in bars of noise on the screen. My question is what would be causing this? Could it be how the video was captured, something to do with how it's processed or the T.V. screen that it is finally outputted to? I have tried various things to correct this and it is now getting tedious and to the point where I won't adjust speed at all.
All help would be greatly appreciated.
Cheers people!!

I have been recording most stuff with my Sony MiniDV camcorder but noticed that it does exactly the same when taking footage from other sources including built in isight on imac.
I render everything as I go if thats what you mean.
I have not tried and do not know how to do frame blending, will have a look tonight.
Cheers.

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