how to find Dual-tree and double-density 1-D wavelet transform?

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t=[0 :1/3096:0.2]; y=sin(314*t); level=2; wt = dddtree('cplxdt',y,level,'dtf1'); Above code works for level=1 and 2 but when I try for level 3 or higher it shows an error. Can anyone help me in this?

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