how to calculate the frequency of a certain signal ?

hello everybody,

how i can calculate the frequency range of a given signal? for example i got that signal in the attached .mat file here, how to calculate the frequency range of it in order to know if this is delta alpha beta or gamma or whatever range?

Thank you in advance.

[Star Strider]

The file contains only the (1x510) ‘Signal11’ vector. Without the matching time vector or the sampling frequency, it is not possible to determine the frequency range anything in that signal.

[Walter Roberson]

Right, not unless you know the sampling frequency or sampling interval.

Answer 1

[KSSV]

You have to use fft to calculate the frequency....Read about the function fft.

[Jack]

Thank you for this answer. but what i need is that the file attached there is a range signal, let say (4-7Hz) then how to read this, is there any simple matlab function tell me that this signal or this mat file hold a signal in range 4-7 or x-yHz ???

[KSSV]

load signal.mat ;
s = Signal11 ;
% get 4-4 Hz
f_47 = s(s>=4 & s<=7) ;

[Jack]

thank you for your answer Mr.KSSV, but i do not need to get this range. what i asked is that the file attached here is represent a signal that i do not know what is it, so how to calculate this signal to know its range ?? thank in advance.