{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Untitled4 - figure(2 stem(freqs abs(fftshift(xz title'FFT...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
%ECE spectrum analysis example %% create a signal with 2 frequencies omega_1=0.6*pi; omega_2=0.7*pi; n=0:1023; s = 0.7*cos(omega_1*n) + 0.3*cos(omega_2*n); stem(s); %% take a (rectangular)window of the signal N=32; x=s(1:32); stem(x), label('A rectangular window of signal'); s %% first approach: take the DFT(FFT) of x X=fft(x); N=32; freqs=pi*(-1:2/N:1-2/N); figure(1) stem(freqs, abs(fftshift(x))); label('FFT of x') %% Zero pad signal M=256; xz=zeros(1,M); xz(1:N)=x; Y=fft(y); freqs=[-1:2/M:(1-2/M)];
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: figure(2) stem(freqs, abs(fftshift(xz))); title('FFT of (x with zero pading)') %% we have Used the rectangular of window w_rect=ones(1,N); stem(w_rect) freqz(w_rect) title('Frequency respones of rect window') %% Now, letss use a better window w_ham = hamming(N) y=x.* w_ham'; subplot(2,1,1), stem(x), subplot(2,1,1), stem(y), %% Zero pad windowed signal M=256; yz= zeros(1,M); yz(1:N)=y; freqs = [-1:2/M:(1-2/M); subplot...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern