Question

What should be the upper limit of the solution to match h(n) perfectly to the desired response hd(n)?

(a) L

(b) L+1

(c) L-1

(d) L+2

The question was asked in an international level competition.

My enquiry is from Pade Approximation Method topic in section Digital Filters Design of Digital Signal Processing

Answer 1

Right option is (c) L-1

Explanation: If we select the upper limit as U=L-1, it is possible to match h(n) perfectly to the desired response hd(n) for 0 < n < M+N.