Explain why the output of first image is zero and the output of the second image

Question

Explain why the output of first image is zero and the output of the second image is not zero. The first image is an ideal band-pass while the second image is a band-pass with a length of 21.

4 Discrete LTI (Linear Time Invariant system Demo ver 2.74 Plot Options Help Movie Tool INPUT SIGNAL OUTPUT SIGNAL Magnitude of the Filter 1.5 0.9 cos 0.65 Tn) 2.5 50.5 -T -0.5 T 0 0.5 2.5 -2.5 Frequency Phase of the Filter 10 20 30 10 20 30 Filter Specifications: Amplitude 0.9 0.9 Center Freq 2N (0.2) Frequency 2x (0.325) 0.2 0.325 Phase Slope -2 Phase -TT -0.5 0 0.5 Filter Choice DC Level 1.5 Frequency 1.5 deal Band-Pass Theoretical Answer

Explanation / Answer

In the first figure it is the impulse ideal band pass filter. In this from -pi to -0.5pi is stop band and from -0.5pi to 0 is pass band.

From figure 2 it is chebyshev band pass filter.

As band pass filter is combination of stop band filter and pass band filter.

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