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About: QS Regular Matrix     Goto   Sponge   NotDistinct   Permalink

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Quadraphonic Sound (originally called Quadphonic Synthesizer, and later referred to as RM or Regular Matrix) was a matrix 4-channel quadraphonic sound system for phonograph records. The system was based on technology created by Peter Scheiber, but further developed by engineer Ryosuke Ito of Sansui in the early 1970s. RM (Regular Matrix) was often used a synonym for QS, but was actually a standard set by the Japanese governing body, which also embraced the QM (Quadraphonic Matrix, consisting of Stereo-4 and Dynaquad) and QX (QuadXtra, based on D.H. Cooper "Dual-Triphonic") matrix systems.