Hi,
This is in continuation of my other posts for the same subject. We are now designed a working filter but are presently facing some problems as mentioned below:
The filter does not work for any input frequency which varies in the second decimal place,
Eg
if the input freq is say 2.15 Hz the filter does not work well, we observe amplitude errors and some random dips in the amplutude response, however the freq is ok.
With all settings the same and only the input changed ot 2.1 Hz the filter starts to work fine.
This phenomenom is observed over the either filter range of 0.1 Hz to 5 Hz
In brief, our porblem is that, while acquiring dynamic signal from a daq (NI 6229), we may encounter any signal between 0.1 hz to 5 hz, since it is an analog signal and the freq can go to an accuracy of at least 10 exp -6 we are not able to filter these signals since out filter can filter signal only up to the first decimal place which is 10 exp -1.
We are attaching a doc to this post. containing further details.
We are in a time critical situation.
Thanks and regards.
sunil
