Refactor three signal processing library files. WebRTC issue 545 is solved by the way.
Review URL: https://webrtc-codereview.appspot.com/692007

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2562 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed