Info
This question is closed. Reopen it to edit or answer.
Extraction the magnitude responce point
1 view (last 30 days)
Show older comments
I have this code matlab
>> w = -pi:pi/500:pi;
>> H = freqz(ones(1,10)/10,1,w);
>> subplot(211)
>> plot(w,abs(H))
>> grid; axis([-pi pi 0 1])
>> ylabel('Magnitude Response')
the design,
If xf=-1 : frequency point , xm : magnitude responce point.
How can i extract the magnitude responce point starting from the frequency point ?
2 Comments
Meg Noah
on 11 Jan 2020
I don't have that version or toolbox to get freqz. I think what you want is to interpolate the abs(H) values for the position of xf=01. It would be something like
xm = interp1(w,abs(H),xf,'pchip');
Sorry, I can't help more. Gotta save my allowance to purchase the newer matlab :-(.
Star Strider
on 11 Jan 2020
Correct!
w = -pi:pi/500:pi;
H = freqz(ones(1,10)/10,1,w);
xm = interp1(w,abs(H),-1);
subplot(211)
plot(w,abs(H))
grid; axis([-pi pi 0 1])
hold on
plot(subplot(2,1,1), [min(w) -1],[1 1]*xm, '-r', [1 1 ]*(-1), [0 xm],'-r')
hold off
text(-1,0,'x_f', 'HorizontalAlignment','center', 'VerticalAlignment','top')
text(min(w),xm,'x_m', 'HorizontalAlignment','right', 'VerticalAlignment','middle')
ylabel('Magnitude Response')
producing:
The ‘xm’ value is about 0.2.
This is your idea, so I’m not posting it as an Answer.
Answers (0)
This question is closed.
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!