 The impulse response of HPF is following. (How to change the scale is "View"
-> "Scale Change" on the menu) See there is no DC (Direct
Current, 0Hz) in it.  You can see FFTMON for its spectrum. That's the same as WINHPF's frequency
response and DC(0Hz) is rejected.  If you place WINBPF (FIR type Band Pass Filter by Window Function Algorithm),
the impulse response of is following.  And this is its spectrum. That's the same as WINBPF's frequency response.
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