Hi all. Im using the following code to calculate the absorption coefficient using the transfer function of an impedance tube

I import data that has 4 columns.1st being the order 2nd the x value 3rd being the y real value and the 4th being y imaginary value. But when I compute the data my plot is not what I am expecting.What have I done wrong?|

[Nate Palella]

What material are you testing? What's your sample rate? What do your transfer functions looks like?

Answer 1

[John]

yes sorry the follow on from that code

%plot results freq = zeros(((fu-fl)/fs)+1,1); for z=1:1:((fu-fl)/fs)+1 freq(z,1) = z*fs-1; end

figure plot(freq,alpha,'b','LineWidth',1) xlabel('Frequency (Hz)','FontSize',20,'FontName','times new roman') ylabel('Sound Absorption Coefficent','FontSize',20,'FontName','times new roman') axis([50 fu 0 1]) set(gca,'FontSize',16)

Answer 2

[John]

The graph looks like this

Answer 3

[John]

Graph

Answer 4

[John]

it is supposed to be one curve over the frequency span. Any reasons to why this might be the case?

Answer 5

[vaibhav kumar]

Did you figure out the solution? I have the same problem!

Answer 6

[Tom Lee]

Any luck with this code?