requirement 0<91<(1)0,(2)0<92<(3)0,(3)0<93<(4)0 (21) Choosing any cutoff frequencies which satisfy (2. 1) would be sufficient. Let's say, for practicality sake, that we want to choose the cutoff frequencies in the midpoints between the desired and undesired frequency components. This gives us the following specific values 2,92,(2+3)u 0+1)u Trequirement: 0 < �1 < (1)�0, (2)�0 < �2 < (3)�0, (3)�0 < �3 < (4)�0 (2.1) Choosing any cutoff frequencies which satisfy (2.1) would be sufficient. Let’s say, for practicality sake, that we want to choose the cutoff frequencies in the midpoints between the desired and undesired frequency components. This gives us the following specific values: �1 = (0 + 1)�0 2 , �2 = (2 + 3)�0 2 , �3 = (3 + 4)�0 2 , where �0 = ω 2 ω 5ω 7ω � �1 = 4 , �2 = 4 , �3 = 2 . 7