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the ideal low pass filter has impulse response sinc function
so first determine the fc
calculate impulse response 2fc*sinc(2fct)
then truncate the impulse response by 2N, by multipling the result h(t) by appropraite window such as hamming or hannig window
the result is your impulse response
u can verify your work by calculte the frequency response to result inpulse respone
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