Finding Frequency range from Time series

Hello,

I am trying to find the frequency range from the time range that I have made. I read the FFT documentation, but it is not working for my code.

https://www.mathworks.com/help/matlab/ref/fft.html

spindle_speed = 960
n=1; % number of cycles
c = inv(spindle_speed/60)*n ;% maximum time limit
d = c/100;  % number of steps to divide the time range
t =[0:d:c]

f = spindle_speed/60*(0:d:(c/2))/c;

This code works for a single cycle, the frequency should be

f = 1/(2*t)

But for more than 1 cycle, this code is not giving correct answers

Does anyone know?

[Chris Dan]

Star Strider

Hey

can you help me with this....?

Answer 1

[Chris Dan]

This works for me

Fs = 1000; % Sampling frequency

T = 1/Fs; % Sampling period

L = 128; % Length of signal-63 for one cycle

t = (0:L-1)*T; % Time vector

f = Fs*(0:(L/2))/L;