[理工] [線性系統]

[fonlintw0621 (fonlintw0621)]

The impulse reponse of an ideal lowpass filter is given by


                  sin2w(t-t0)
g(t) =   2w  --------------------

                    2w(t-t0)



for all t , where w  and t0 are constant.



Is the ideal lowpass filter causal ?

Is it possible to build the filter in the real world ?


沒有頭緒 有請高手。

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推 ketsu1109:並非causal (在t<0時,g(t)不一定為0)