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finding sample rate

Hi, I have to take FFT of a signal, which will be in anywhere between

200-3000Hz.If I have to take FFT should I sample the signal only in powers of 2(2 power 20 samples or 2 power 21 samples, ofcourse atleast >6000 samples)? Thanks in advance.
Reply to
Wills
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|-------------------------------------------------------------------| |"[..]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)?" | |-------------------------------------------------------------------|

2 to the power of 20 is >6000. 2 to the power of 13 is 8192 which is the smallest number >6000 which can be obtained by raising 2 to the power of a natural number.

Good luck, Colin Paul Gloster

Reply to
Colin Paul Gloster

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

Thanks in advance.

Reply to
Wills

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.

Reply to
baranovus

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