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# How to determine the frequency SAMPLING?

Asked by BANI tita on 1 Jan 2013

i have function determined by: x(t)=sin[2*pi*(n/60)*p*t + sin(2*pi*m*(n/60)*t)] In the cases: n=1450 r.p.m. (rotating speed) p=20 , p=40, p=100 (pulses per revolution of an encoder) m=1, m=2 (multiplicity order of rotating speed) how to determine frequency sampling????

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Answer by Image Analyst on 1 Jan 2013

Sample it however frequent you want. The spacing between different values of t can be anything. What do you want? Exactly the Nyquist frequency? Something greater or lesser? How are we supposed to know? What is your goal? What are you trying to show, illustrate, or determine?

Answer by BANI tita on 1 Jan 2013
Edited by Image Analyst on 1 Jan 2013

i want to do frequency modulation of this function and carrier frequency is variant. please see this program and say me is correct or no????

```Fs=1000;
n=1450;
T=1/Fs;
L=1024;
t=(0:L-1)*T;
d = pow2(nextpow2(L));
f = (0:d-1)*(Fs/d);
%f = Fs/2*linspace(0,1,d);
for m=1
for p=20
x1=sin(2*pi*(n/60)*p*t+sin(2*pi*m*(n/60)*t));
y1=fft(x1,d)/L;
power1 = y1.*conj(y1)/d;
end
```