How to convert IIR filter transposed direct form || SOS to traditional transposed direct form ||?

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fateme mirabbasi 2021-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/862070-how-to-convert-iir-filter-transposed-direct-form-sos-to-traditional-transposed-direct-form

评论： fateme mirabbasi 2021-6-22

I have created a high pass butterworth filter in FilterDesigner tool in MATLAB. now I want to convert its structure to transposed direct form || and then do model realization. Is there a way I can realize it as traditional transposed direct form, as it existed in older versions of fdatool like R2012, and not second-order sections?

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Chunru 2021-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/862070-how-to-convert-iir-filter-transposed-direct-form-sos-to-traditional-transposed-direct-form#answer_730280

编辑：Chunru 2021-6-22

在 MATLAB Online 中打开

% Get the filter coefficients (replace a and b with butterworth filter)
b = [0.3 0.6 0.3];
a = [1 0 0.2];
% >R2011a: differet structure of filter implementations
hd = dfilt.df1(b,a);
hd = dfilt.df2(b,a);
hd = dfilt.df1t(b,a);
hd = dfilt.df2t(b,a);