illegal121
Member level 2
hi there ... I am working on EEG signals .. And sampled it using ADC0804...
As I read in the forums here that :
" Theoretically (Nyqist theorem) the cutoff frequency of the anti-aliasing filter should be 1/2 of the sampling frequency. In practice the cutoff frequency should be even smaller; it depends (among other things) on the number of poles in the filter. "
It means if I have an anti-aliasing filter of cutt of 25 hertz then my sampling frequency will be of 50 Hz ... Am I rite .. It means that ADC0804 conversion time or its RC constant i.e (1/1.1RC) doesn't plays any role...
Please Guide ...
As I read in the forums here that :
" Theoretically (Nyqist theorem) the cutoff frequency of the anti-aliasing filter should be 1/2 of the sampling frequency. In practice the cutoff frequency should be even smaller; it depends (among other things) on the number of poles in the filter. "
It means if I have an anti-aliasing filter of cutt of 25 hertz then my sampling frequency will be of 50 Hz ... Am I rite .. It means that ADC0804 conversion time or its RC constant i.e (1/1.1RC) doesn't plays any role...
Please Guide ...