While I am a fan of Onkyo equipment, I don't put much stock in patented or trademarked terms these manufacturers use to describe their version of a similar feature in other equipment.
I am rather familiar with the patent process as I have more than a few patents in my name (mostly software related). If you can show even a slight twist that differs from other approaches 'known to those skilled in the state of the art' (that's one of 3 requirements for a patent) you can patent just about anything.