Question

Which of the following is the first method proposed for design of FIR filters?

(a) Chebyshev approximation

(b) Frequency sampling method

(c) Windowing technique

(d) None of the mentioned

This question was posed to me by my school principal while I was bunking the class.

My question is based upon Comparison of Design Methods for Linear Phase FIR Filters in section Digital Filters Design of Digital Signal Processing

Answer 1

The correct answer is (c) Windowing technique

To explain I would say: The design method based on the use of windows to truncate the impulse response h(n) and obtaining the desired spectral shaping, was the first method proposed for designing linear phase FIR filters.