CNET GLOSSARY: Terms for the techie
Dolby Pro Logic
The analog version of surround sound for home video, Dolby Pro Logic splits a regular stereo signal into front and back components, and then usually puts a slight delay on the rear speakers to create an illusion of 3D audio depth. A mono center speaker is usually added to reduce disorientation caused by hearing stereo sound from the sides while watching video in the center.
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