www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@filterquantizer/latticemamaxheader_order0.m
function Head = latticemamaxheader_order0(q,num,H,info) %LATTICEMAMAXHEADER_ORDER0 specifies the blocks, connection and quantization parameters in the %conceptual head stage for a 1st order iir filter % Author(s): Honglei Chen % Copyright 1988-2009 The MathWorks, Inc. % Generate the last layer of the structure. NL=filtgraph.nodelist(5); NL.setnode(filtgraph.node('sum'),1); NL.setnode(filtgraph.node('gain'),2); NL.setnode(filtgraph.node('delay'),3); % specify the block label set(NL.nodes(1).block,'label','BodyPSum'); set(NL.nodes(2).block,'label','K*'); set(NL.nodes(3).block,'label','BodyDelay'); % specify the relative position towards the grid set(NL.nodes(1),'position',[0.7 1 0.7 1]); set(NL.nodes(2),'position',[0.6 0.7 0.6 0.7]); set(NL.nodes(3),'position',[0.3 1 0.3 1]); % specify the orientation set(NL.nodes(1).block,'orientation','right'); set(NL.nodes(2).block,'orientation','right'); set(NL.nodes(3).block,'orientation','right'); % set up the parameter pgain = {'0'}; qgain = {'0'}; pgain = NL.coeff2str(num,info.nstages); qgain = NL.coeff2str(conj(num),info.nstages); % Specify coefficieint names qlabel = {}; if info.doMapCoeffsToPorts qlabel{1} = sprintf('%s%d',info.coeffnames{1},info.nstages); end mainparams(1)=filtgraph.indexparam(1,'++|'); mainparams(2)=filtgraph.indexparam(2,qgain,qlabel); mainparams(3)=filtgraph.indexparam(3,['1,' mat2str(info.states(info.nstages,:))]); % add input and output NL.setnode(filtgraph.node('input'),4); set(NL.nodes(4).block,'label','Input'); set(NL.nodes(4),'position',[-0.5 0 -0.5 0]); set(NL.nodes(4).block,'orientation','right'); mainparams(4)=filtgraph.indexparam(4,{}); NL.setnode(filtgraph.node('output'),5); set(NL.nodes(5).block,'label','Output'); set(NL.nodes(5),'position',[1.5 1 1.5 1]); set(NL.nodes(5).block,'orientation','right'); mainparams(5)=filtgraph.indexparam(5,{}); % specify the qparam set(NL.nodes(1),'qparam','double'); set(NL.nodes(2),'qparam','double'); % specify the connection % NL.connect(source node, source port, dest node, dest port) % note that input and output are numbered separately NL.connect(4,1,2,1); NL.connect(4,1,3,1); NL.connect(2,1,1,1); NL.connect(3,1,1,2); NL.connect(1,1,5,1); Head = filtgraph.stage(NL,[],[],[],[],mainparams);