Question

The fir1 command can be used to find _____________

(a) High Pass Filters using IIR method

(b) Low Pass Filters FIR method

(c) Filters using Window Method

(d) FIR filters using Window Method

This question was posed to me in a job interview.

Question is taken from Fourier Analysis and Filtering in division Beyond the Basics of MATLAB

Answer 1

Right answer is (d) FIR filters using Window Method

The explanation: The fir1() command is a pre-defined command in MATLAB and it uses the Hamming Window method to obtain the Response of any FIR filter. Low Pass Filters FIR method would’ve been correct but FIR filters using Window Method is a more generalized answer.