DTFFIR is not a filter structure. Try one of:\ndfilt.dffir (Direct-form FIR),\ndfilt.dffirt (Direct-form FIR, transposed),\ndfilt.dfasymfir (Antisymmetric FIR),\ndfilt.dfsymfir (Symmetric FIR)
optimizecoeffwlfir
DTFFIR is not a filter structure. Try one of:\ndfilt.dffir (Direct-form FIR),\ndfilt.dffirt (Direct-form FIR, transposed
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