1. We want to design a low-pass FIR filter with a passband frequency of / = 0.12 and a stopband frequency of f.=0.28 . We want a maximum of +/- 1dB of change in the passband and at least 40 dB of attenuateon in the stopband. a. (2 pts) Determine the cut-off frequency of the filter. b. (15 pts) Using the 'plot' command and a 4096-point FFT in MATLAB, plot the magnitude of frequency response characteristic (in dB) on the interval Os f