How can I find the nyquist rate and Nyquist interval?

Hi I need urgent help The question is finding the Nyquist rate and Nyquist interval of the belove signal on matlab.?

f(t)=sinc(100*pi*t)+sincsquare(60*pi*t)

please help I couldnt do anything

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

Answer 1

[Wayne King]

It completely depends on your t vector

Do the following

   dt = mean(diff(t));

The Nyquist interval is

[-1/(2*dt), 1/(2*dt)]

If by Nyquist rate, you mean what is the necessary sampling rate, that depends on the bandwidth of the output of sincsquare()

That is not a MathWorks' function, so we can't say without the code what the bandwidth is

[rabia ceki]

bandwidth is 100pi rad/s

[Wayne King]

I'm asking about sincsquare()? We need to know what the Fourier transform of that is. For the sinc() you show, I think you need to sample at a minimum of 200 samples/sec. It looks to me that the rectangle which is the Fourier transform of the sinc here has support on the interval [-100,100]