3.9. Design a second-order digital bandpass Butterworth filter with a lower cutoff frequency of 1.9 kHz, an upper cutoff frequency of 2.1 kHz, and a passband ripple of 3 dB at a sampling frequency of 8,000 Hz. a. Determine the transfer function and difference equation. b. Use MATLAB to plot the magnitude and phase frequency responses. D. Design a second-order digital bandstop Butterworth filter with a center frequency of 1.8 kHz, a bandwidth of 200 Hz, and a passband ripple of 3 dB at a sampling frequency of 8,000 Hz. a. Determine the transfer function and difference equation. b. Use MATLAB to plot the magnitude and phase frequency

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