?? zmapping.m
字號:
function [bz,az] = zmapping(bZ,aZ,Nz,Dz)
% 從Z域到z域的頻帶變換
% -------------------------------------------------------
% [bz,az] = zmapping(bZ,aZ,Nz,Dz)
% 實(shí)現(xiàn):
% b(z) b(Z)|
% ---- = ----| N(z)
% a(z) a(Z)|@Z = ----
% D(z)
%
bzord = (length(bZ)-1)*(length(Nz)-1);
azord = (length(aZ)-1)*(length(Dz)-1);
bz = zeros(1,bzord+1);
for k = 0:bzord
pln = [1];
for l = 0:k-1
pln = conv(pln,Nz);
end
pld = [1];
for l = 0:bzord-k-1
pld = conv(pld,Dz);
end
bz = bz+bZ(k+1)*conv(pln,pld);
end
az = zeros(1,azord+1);
for k = 0:azord
pln = [1];
for l = 0:k-1
pln = conv(pln,Nz);
end
pld = [1];
for l = 0:azord-k-1
pld = conv(pld,Dz);
end
az = az+aZ(k+1)*conv(pln,pld);
end
az1 = az(1); az = az/az1; bz = bz/az1;
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