21 1 2 x 3 July 8, 2019 16 32 64 128 21 1 2 x 16 3 8 filter 21 2 7 x 3 )= 1 16 3 8 x 21 1 2 3 x 1 2 3x x 5 )= 21 21 1 2 x 5 3 4 21 1 2 x 23 3 8 ac filter 21 1 2 4 3x x 19 7 8 x 21 1 2 x 3 4 1 2 x 30 x 21 21 2x 2 x 3 1 16 3 8 x 21 1 2 x 3 4 39 x 21 1 2 21 1 3 x 13 1 2 3 1 2 x 8 )=- 21
