Penteo
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Penteo is the registered trademark for a process developed by John Wheeler of Berkeley, CA for upconverting stereo recordings into surround sound using a Fast Hartley Transform followed by a coorelation algorithm and an artifact scavenger. The process is able to cleanly recover stereo sounds that the original mixer sent to the left, center, right of a stereophonic mix, with discrete separation between the channels. Those channels can then be re-collated with the original stereo mix to create a surround environment based on the original stereo mixer's stereo panorama choices.
It was first demonstrated publicly at the Surround Expo in Los Angeles in 2005. It is being used experimentally for production of classic rock surround source material for the pilot surround broadcast program at WZLX Boston.
