Which of the following is not suitable either as low pass or a high pass filter?
A. h(n) symmetric and M odd
B. h(n) symmetric and M even
C. h(n) anti-symmetric and M odd
D. h(n) anti-symmetric and M even
Answer:A
Which of the following is not suitable either as low pass or a high pass filter?
A. h(n) symmetric and M odd B. h(n) symmetric and M even C. h(n) anti-symmetric and M odd D. h(n) anti-symmetric and M even
Explanation: If h(n)=-h(M-1-n) and M is odd, we get H(0)=0 and H(π)=0. Consequently, this is not suitable as either a low pass filter or a high pass filter.