How to implement a generic 'filter' function using direct form I?
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vinicius lanziotti
il 14 Giu 2019
Risposto: Walter Roberson
il 14 Giu 2019
I need a code for the filter function in direct form I, like as I implemented a filter function in direct form II transposed below:
function[y] = filtro(a,b,x)
% Generic filter function in direct form II transposed
N = size(b,2) - 1;% filter order
y = zeros(size(x)); % Initializes y with zeros
%% FOR THE CASE FIR
if not(size(a,2) == size(b,2))
a(1) = 1;
a = zeros(size(b));
end
%% Recursive implementation of equations to differences
aux = zeros(1,N);
for r = 1 :size(x,2)
y(r) = b(1)*x(r) + aux(1);
for n = 2 : N
aux(n-1) = b(n)*x(r) + aux(n);
aux(n-1) = aux(n-1)- a(n)*y(r);
end
aux(N) = b(N+1)*x(r) - a(N+1)*y(r);
end
end % END OF FUNCTION
Thanks!
2 Commenti
Walter Roberson
il 14 Giu 2019
What is the difference between this question and the other one you asked about these filters?
Risposta accettata
Walter Roberson
il 14 Giu 2019
filterdf1 = @(a,b,x) filter( dfilt.df1(a,b), x);
This is a three-argument filter function that uses direct type 1 form.
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