Question 4 (20 marks) Recommend with the MATLAB function, "iirnotch" a notch filter design to remove the seventh harmonic frequency component of the filtered triangular wave from the waveform of Q3(c).

The notch filter should have a bandwidth of 8 Hz, with a 3 dB dip at the frequency extremes. The following codes and plots are required: (a) MATLAB code to meet the design specification. (10 marks for code) (b) A single sided log magnitude plot of the notch filtered waveform using the waveform of part Q3(c) as the input. Discuss the effectiveness of the notch filter. Candidates are reminded to use a consistent value of sampling frequency for all the four questions of this assignment (hint: use fs = 600 Hz) to prevent frequency aliasing. (10 marks for plot and explanation)