Question

If δ(n) is the input, then what is the ideal output of yd(n)?

(a) δ(n)

(b) 0

(c) u(n)

(d) None of the mentioned

The question was posed to me by my school teacher while I was bunking the class.

My question comes from Least Squares Design Methods topic in portion Digital Filters Design of Digital Signal Processing

Answer 1

Correct answer is (a) δ(n)

The best I can explain: We excite the cascade configuration by the unit sample sequence δ(n). Thus the input to the inverse system 1/H(z) is hd(n) and the output is y(n). Ideally, yd(n)= δ(n).