Hr_type3 function in matlab

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Arihant Barjatya
Arihant Barjatya 2020-12-6
回答： Sukrut Tamhankar 2020-12-9
I am trying to design a type 3 FIR filter and generate its amplitude response from the function Hr_type3 (mentioned in Digital processing in matlab by Proakis), but getting an error of unknown function or variable.
Can any one help me on this?
I am trying to run this code.
M = 21;
alpha = (M-1)/2;
n = 0:M-1;
hd = (cos(pi*(n-alpha)))./(n-alpha);
hd(alpha+1) = 0;
w_ham = (hamming(M))';
h = hd .* w_ham;
[Hr,w,P,L] = Hr_Type3(h);

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回答（1 个）

Sukrut Tamhankar
Sukrut Tamhankar 2020-12-9
Hr_Type3() is not an in-built function in MATLAB for FIR Filter design. Hence, before directly calling this function, you need to define this function in one separate M-file and save that file with the function name (i.e. Hr_Type3.m in this case) in the same folder in which the above MATLAB script is present.
Hence, the function definition (Hr_Type3.m file) looks like below (Reference: Digital Signal Processing Using MATLAB V.4 by John G. Proakis):
function [Hr,w,c,L] = Hr_Type3(h)
M=length(h);
L=(M-1)/2;
c=[2*h(L+1:-1:1)];
n=[0:1:L];
w=[0:1:500]'*pi/500;
Hr=sin(w*n)*c';
end
Then, when you call this function in your script using following line of code, you will not face any error message:
[Hr,w,P,L] = Hr_Type3(h);
I hope this information helps in resolving the issue.

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