linguistic:voice_change, information:classification
Rational approximation

The pulse function may also be expressed as a limit of a rational function:

Π (t) = lim n → ∞, n ∈ (Z) 1 (2 t) 2 n + 1. {\displaystyle \Pi (t)=\lim _{n\rightarrow \infty,n\in \mathbb {(} Z)}{\frac {1}{(2t)^{2n}+1}}.}