Sampling in short bursts?

Hello



I�m wondering what rules applies if I�m sampling a signal in short bursts?
Lets say I want to sample a level and I do that by sampling 10 sample points
at 1 �s apart. Then I calculate I mean value of these 10 points. The
sampling frequency in the bursts are 1 MHz. Should I calculate my antialias
filter by that value (fN = 500 kHz) ?

Hello Helmut,

> 
> I�m wondering what rules applies if I�m sampling a signal in short bursts?
> Lets say I want to sample a level and I do that by sampling 10 sample points
> at 1 �s apart. Then I calculate I mean value of these 10 points. The
> sampling frequency in the bursts are 1 MHz. Should I calculate my antialias
> filter by that value (fN = 500 kHz) ?
> 
> 
If you expect noise above 500kHz in the signal then that would make 
sense. I'd place it a bit lower though since you can't really make a 
brickwall filter. It will have a slope even if it was a long Tchebychev.

Regards, Joerg

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