Keywords: State-variable-filter.png State variable filter svg Schematic of a state variable filter Transferred from http //en wikipedia org en wikipedia; transferred to Commons by User Kelly using http //tools wikimedia de/~magnus/commonshelper php CommonsHelper 2005-04-25 Ianharvey at http //en wikipedia org en wikipedia PD-AUTHOR; Released into the public domain by the author Ianharvey Original upload log page en wikipedia State-variable-filter png 2005-04-25 21 08 Ianharvey 531×330× 4858 bytes <nowiki>Schematic of a state variable filter</nowiki> Linear filters |