www.gusucode.com > signal 工具箱matlab源码程序 > signal/@dfilt/@df1/blockparams.m
function s = blockparams(Hd, mapstates, forceDigitalFilterBlock) %BLOCKPARAMS Returns the parameters for BLOCK % Copyright 1988-2012 The MathWorks, Inc. if nargin < 3 forceDigitalFilterBlock = false; end s = iir_blockparams(Hd,forceDigitalFilterBlock); if ~forceDigitalFilterBlock s.FilterStructure = 'Direct Form I'; if strcmpi(mapstates, 'on') ic = getinitialconditions(Hd); if isempty(ic.Num) ic.Num = 0; end s.InitialStates = mat2str(ic.Num); if isempty(ic.Den) ic.Den = 0; end s.InitialDenominatorStates = mat2str(ic.Den); end else s.IIRFiltStruct = 'Direct Form I'; if strcmpi(mapstates, 'on'), ic = getinitialconditions(Hd); s.ICNum = mat2str(ic.Num); s.ICDen = mat2str(ic.Den); end end