This can be the work from the polyphase filters, which might be all-pass filters and only modify the phase. The section marriage involving The 2 polyphase filters in this instance is these kinds of that it's going to compensate for that added "twist" so which the stage involving the specified https://share.evernote.com/note/ebea7c23-af75-8024-d7e5-a193c523ffba