finding sample rate

|-------------------------------------------------------------------| |"[..]If I have to take FFT should I sample the signal only in | |powers of 2[..]?" | |-------------------------------------------------------------------|

No, unless you are using something (e.g. a library) which needs you to.

|-------------------------------------------------------------------| |"(2 power 20 samples or 2 power 21 samples, ofcourse | |atleast >6000 samples)?" | |-------------------------------------------------------------------|

Good luck, Colin Paul Gloster

Thanks. Should the number of samples be 2 power x?

Thanks in advance.

For FFT you should have 2^N number of samples, but you don't have to have 2^M value of sampling frequency. Choose it basing on the rejection factor of your anti-aliasing filter. Good luck, Alex.