How to implement a generic 'filter' function using direct form I?
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vinicius lanziotti
el 14 de Jun. de 2019
Respondida: Walter Roberson
el 14 de Jun. de 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 comentarios
Walter Roberson
el 14 de Jun. de 2019
What is the difference between this question and the other one you asked about these filters?
Respuesta aceptada
Walter Roberson
el 14 de Jun. de 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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