5.1 Calculate the impulse response of an ideal low-pass filter. - YouTube
bode plot - Why a low-pass filter applied to a square wave gives a weird wave? - Electrical Engineering Stack Exchange
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The Ideal Lowpass Filter
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transfer function - Consider an ideal low pass filter $H(\omega)$, and the input to this filter is the periodic square wave $x(t)$. Find the output $y(t)$ - Signal Processing Stack Exchange