Transform quadruplet of filters to lifting scheme
LS = filt2ls(LoD,HiD,LoR,HiR)
LS = filt2ls(LoD,HiD,LoR,HiR) returns the
lifting scheme LS associated with the four input
filters LoD, HiD, LoR,
and HiR that verify the perfect reconstruction
condition.
[LoD,HiD,LoR,HiR] = wfilters('db2')
LoD =
-0.1294 0.2241 0.8365 0.4830
HiD =
-0.4830 0.8365 -0.2241 -0.1294
LoR =
0.4830 0.8365 0.2241 -0.1294
HiR =
-0.1294 -0.2241 0.8365 -0.4830
LS = filt2ls(LoD,HiD,LoR,HiR);
displs(LS);
LS = {...
'd' [ -1.73205081] [0]
'p' [ -0.06698730 0.43301270] [1]
'd' [ 1.00000000] [-1]
[ 1.93185165] [ 0.51763809] []
};
LSref = liftwave('db2');
displs(LSref);
LSref = {...
'd' [ -1.73205081] [0]
'p' [ -0.06698730 0.43301270] [1]
'd' [ 1.00000000] [-1]
[ 1.93185165] [ 0.51763809] []
};