If |H(ω)| is square integrable and if the integral is finite, then the filter with the frequency response H(ω)=|H(ω)|ejθ(ω) is?
A. Anti-causal
B. Constant
C. Causal
D. None of the mentioned
Answer:A
If |H(ω)| is square integrable and if the integral is finite, then the filter with the frequency response H(ω)=|H(ω)|ejθ(ω) is?
A. Anti-causal B. Constant C. Causal D. None of the mentioned
Explanation: If |H(ω)| is square integrable and if the integral is finite, then we can associate with |H(ω)| and a phase response θ(ω), so that the resulting filter with the frequency response H(ω)=|H(ω)|ejθ(ω) is causal.