thiết kế bộ lọc bằng phương pháp cửa sổ (hamming, hanning, blackman, keiser): Design a bandstop filter using the Hanning window design technique. Plot the impulse response and the magnitude response (in dB) of the design filter Design a bandpass filter using the Hamming window design technique. Plot the impulse response and the magnitude response (in dB) of the designed filter.