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Can I apply the Fourier Transform to a Fourier series?

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    I have a Fourier series that belongs to a bipolar pulse (square wave). I have to filter that signal through an ideal low pass filter, h(f), with cutoff frequency at 4KHz. At the beginning I thought the Fourier series was the "same" as the Fourier Transform but then I realize that the Fourier series is x(t) not x(f). Then I started to think that maybe I should apply the Fourier transform but I am not sure if I should do that because as I said I thought the Fourier series was the same as Fourier transform.2012-07-01
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    Now I am confuse. What I need to know if they are equally. @dranks2012-07-01
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    @marina: [Edit](http://math.stackexchange.com/posts/165308/edit) the question and put that comment in.2012-07-01

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