In Figure E-41 are some descriptions of filters in the form of an impulse response, a frequency-response magnitude and a circuit diagram. For each of these, to the extent possible, classify the filters as ideal or practical, causal or non-causal, lowpass, highpass, bandpass or bandstop.
(a) Ideal , Non-Causal , Lowpass
(b) Practical, Causal, Bandpass
(c) Practical, Lowpass, Cannot determine causality without a phase graph
(d) Ideal, Highpass, Non-Causal
(e) Practical, Highpass, Causal
(f) Practical, Lowpass, Causal
(g) Practical, Highpass, Causal
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