Definition: Dolby Pro-Logic II is a surround sound decoding technology, developed by jointly by Jim Fosgate and Dolby Labs.
Dolby Pro-Logic II technology can create a "simulated" 5.1 channel surround environment from any two channel source (such as stereo CDs and Vinyl Records) as well as from a 4-Channel Dolby Surround signal.
Although not a discrete format, such as Dolby Digital 5.1 or DTS, in which each channel goes though its own encoding/decoding process, Pro Logic II makes an effective use of matrixing to deliver an adequate 5.1 representation of a stereo film or music soundtrack.
Also Known As: PLII
