青云翻译

So use the finite-length sequence h (n) to approximate the infinite sequence

So you want to use finite-length sequences of h (n) approximation of infinite sequences

Therefore must use finite sequence h(n) to approach the infinite long sequence

That is why it is necessary to use a limited long sequences of H (n) to approaching infinite length of sequence

So you want to use finite-length sequences of h (n) approximation of infinite sequences