QS Regular Matrix

rdf:langString QS Regular Matrix

rdf:langString 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. The technology was freely licensed and was adopted by many record labels including ABC, Advent, BluesWay, Candide, Command, Decca, Impulse, Longines, MCA, Passport, Pye, Turnabout and Vox. Hundreds of recordings using this format were released on vinyl LP records during the 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. The QS matrix has been found to offer the advantages of excellent diagonal separation and stereo compatibility, and although the adjacent speaker separation is only 3 dB, this symmetrical distribution produces more stable quadraphonic images than some other matrix systems. The QS record track width is as narrow as a conventional stereo track, so the maximum playing time is the same as conventional stereo records. If the four channels are decoded and afterwards re-encoded to one channel, a normal mono sound with no loss results. QS was the only matrix system that could do that perfectly.