Realistic filters can only approximate this, since an ideal sinc filter (aka "rectangular filter") has an infinite delay, but it is commonly found in conceptual demonstrations or proofs, such as the sampling theorem and the Nyquist-Shannon interpolation formula.
Realistic filters can only approximate this. An ideal sinc filter (aka "rectangular filter") has an infinite delay. It is commonly found in conceptual demonstrations or proofs. This was such as the sampling theorem-Shannon interpolation formula. This was such as the Nyquist-Shannon interpolation formula.