Interpolating FIR filters

This page offers a brief explanation of interpolation FIR filters.

Example

Assume we start with the sample $[1234321]$. Padding with zeros gives: $[1020304030201]$. Let's apply 2 filters.

Filter 1: $[11]$ (also written as $y(kT)=1.0*x(kT)+1.0*x(k-1)T$)