What is the sequence y(n) that results from the use of four point DFTs if the impulse response is h(n)={1,2,3} and the input sequence x(n)={1,2,2,1}?
A. {9,9,7,11}
B. {1,4,9,11,8,3}
C. {7,9,7,11}
D. {9,7,9,11}
Answer:A
What is the sequence y(n) that results from the use of four point DFTs if the impulse response is h(n)={1,2,3} and the input sequence x(n)={1,2,2,1}?
A. {9,9,7,11} B. {1,4,9,11,8,3} C. {7,9,7,11} D. {9,7,9,11}
Explanation: The four point DFT of h(n) is H(k)=1+2e-jkπ/2+3 e-jkπ (k=0,1,2,3)