Help with FFT and wvtool

9 views (last 30 days)
Leor Greenberger
Leor Greenberger on 9 Mar 2013
Hi All,
I am stumped on this one. I created a filter and used wvtool on it.
w_k = kaiser(K,9.5*pi);
wvtool(w_k)
I then set the analysis parameters as follows:
And I get the plot shown below. I have tried every which way to recreate this myself so that I can calculate the main lobe width of various filters to no avail. Ideally, I want the magnitude normalized and response in dB (see first image), but when I couldn't get those plots, I tried to just copy what I have pasted here. My code is as follows (although I have tried many variations of normalizing the FFT to no avail):
K = 512;
Fs = 1E6;
w_k = kaiser(K,9.5*pi);
W_n = fft(w_k,K);
W_n = W_n(1:K/2+1);
W_n = abs(W_n);
W_n = 2*W_n;
n = 0:1:K/2;
freq_n = Fs*n/K;
figure
plot(freq_n/1E6,W_n);
Thanks for the help!
  3 Comments
Leor Greenberger
Leor Greenberger on 11 Mar 2013
Hi Honglei,
I am not sure what the time domain plot is based on, but I set 512 points in the FFT, as shown in the first image, and this is the length I am using in the script.

Sign in to comment.

Answers (0)

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by