www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@filterquantizer/statespaceheader_order0.m
function Head = statespaceheader_order0(q,Dmat,H,info) %STATESPACEHEADER_ORDER0 specifies the blocks, connection and quantization parameters in the %conceptual head stage for a 1st order iir filter % Author(s): Honglei Chen % Copyright 1988-2004 The MathWorks, Inc. % Construct the first layer, structure specific NL=filtgraph.nodelist(3); NL.setnode(filtgraph.node('gain'),1); NL.setnode(filtgraph.node('input'),2); NL.setnode(filtgraph.node('output'),3); % specify the block label set(NL.nodes(1).block,'label','D'); set(NL.nodes(2).block,'label','Input'); set(NL.nodes(3).block,'label','Output'); % specify the relative position towards the grid set(NL.nodes(1),'position',[1.5 0 1.5 0]); set(NL.nodes(2),'position',[1 0 1 0]); set(NL.nodes(3),'position',[2 0 2 0]); % specify the orientation set(NL.nodes(1).block,'orientation','right'); set(NL.nodes(2).block,'orientation','right'); set(NL.nodes(3).block,'orientation','right'); % Obtain the correct value for the gain block ng = NL.coeff2str(Dmat,1); % Specify coefficient name nglabel = {}; if info.doMapCoeffsToPorts nglabel{1} = sprintf('%s%d',info.coeffnames{1},1); end % store the useful information into blocks mainparams(1)=filtgraph.indexparam(1,ng,nglabel); mainparams(2)=filtgraph.indexparam(2,{}); mainparams(3)=filtgraph.indexparam(3,{}); %gain set(NL.nodes(1),'qparam','double'); NL.connect(1,1,3,1); NL.connect(2,1,1,1); Head = filtgraph.stage(NL,[],[],[],[],mainparams);