Let h_1p[n] denote the impulse response of an ideal lowpass filter with unity passband gain and cutoff?frequency ?_c = ?/4. Figure shows five systems, each of which is equivalent to an ideal LTI frequency-selective filter. For each system shown, sketch the equivalent frequency response, indicating explicitly the band-edge frequencies in terms of ?_c. In each case, specify whether the system is a lowpass, highpass, bandpass, bandstop, or multiband filter.

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