Feedforward comb filter structure.
<a href="//commons.wikimedia.org/wiki/User:%D0%94.%D0%98%D0%BB%D1%8C%D0%B8%D0%BD" title="User:Д.Ильин">Д.Ильин</a>: translation
<a href="//commons.wikimedia.org/wiki/File:Comb_filter_feedforward.svg" title="File:Comb filter feedforward.svg">File:Comb filter feedforward.svg</a> by <a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a>