MATLAB Answers

Extraction the magnitude responce point

조회 수: 1(최근 30일)
Johan Johan
Johan Johan 11 Jan 2020
댓글: Star Strider 11 Jan 2020
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,
001.PNG
If xf=-1 : frequency point , xm : magnitude responce point.
How can i extract the magnitude responce point starting from the frequency point ?

  댓글 수: 2

Meg Noah
Meg Noah 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
Star Strider 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:
1Extraction the magnitude responce point - 2020 01 11.png
The ‘xm’ value is about 0.2.
This is your idea, so I’m not posting it as an Answer.

댓글을 달려면 로그인하십시오.

답변(0개)

Community Treasure Hunt

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

Start Hunting!

Translated by