Penteo

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Penteo is a digital audio re-mastering process assembled by John Wheeler of Berkeley, CA for professionally converting existing stereo recordings to 5.1 surround sound (stereo upmixing) by using a DSP cross-correlation algorithm. The process is able to cleanly parse out and recover individual sounds which the original mixer channeled to the left, center, and right panorama locations of a stereophonic mix, with discrete separation between the channels.

The Penteo process is a forensic analysis of a stereo mix, comparing waveforms found in the left and right channels, resulting is a re-creation of the original stereo mix in a 5.1 soundfield.

Alternatively, the left, center, and right can be used as an all-front 3.0 mix, replacing the stereo phantom center with a real one.

It was first demonstrated publicly at the Surround Expo in Los Angeles in 2005. It is being used extensively for production of classic rock surround source material for the HD Radio surround broadcast program at WZLX Boston. ^[1]