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Quadraphonic Sound (originally called Quadphonic Synthesizer, and later referred to as RM or Regular Matrix)〔http://www.reddiamondaudio.net/quadraphonic_qs_system.html〕 was a matrix 4-channel quadraphonic sound system based on the same principles as laid down by Peter Scheiber, but developed by engineer Ryosuke Ito〔(【引用サイトリンク】url=https://www.google.com/patents/US3757047 )〕 of Sansui in the early 1970s. It was adopted by ABC, Advent, Bluesway, Candide, Command, Decca, Impulse, Longines, MCA, Pye, Turnabout and Vox record companies. It was freely licensed to record companies. The concept of ''Regular Matrix'' was often used a synonym to QS, but was actually a standard set by the Japanese governing body, which also embraced the QM and QX 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. The QS record track is as small as a conventional stereo track, so the maximum playing time is the same as conventional stereo records. ==History== As early as 1969 engineer Peter Scheiber developed a matrix system very similar to QS.〔(Surround Sound History )〕 He also was instrumental in many improvements to SQ (see above) quality, in collaboration with Martin Willcocks and Jim Fosgate. In the early 1970 Sansui introduce the Four Channel Synthesizer Decoder QS-1 and the QSE-1 Encoder based on the QS system in Japan and debuted export to the United States in march 1971. The channel separation was only 3 dB, but because of the human way of hearing it sounded relatively good. In 1973 Sansui introduced the ''QS Vario Matrix decoder'' with 20 dB separation in all directions. (The ''Vario Matrix decoder'' could also play SQ records on ''Phase Matrix'' mode with 6 dB separation. Later Sansui used front-rear logic on the SQ mode.) Two outboard decoders, the ''QSD-1'' and ''QSD-2'', as well as the ''QRX'' series of larger receiver-amplifiers, incorporated this matrix and up-conversion. Sansui's QS decoders also had good stereo-to-quad capabilities, wrapping the L-R panorama to LB-LF-RF-RB in a horseshoe topology. (The ''Vario Matrix'' decoder could synthesize four channel sound with high separation - at least 12 dB.) The system was often called RM (Regular Matrix) when used on amplifiers or receivers by other trademarks than Sansui. Many Japanese trademarks like Pioneer or Kenwood had matrix decoders with two modes: - SQ and RM. JVC had two modes on their matrix decoder called Matrix 1 and Matrix 2. That decoder could play both SQ and QS records, but it was a simplified decoder. QS records could also be played on Marantz Vari-Matrix system. (European trademarks like Philips or Bang & Olofsen had only decoders for SQ or both SQ and CD-4 - but not QS.) QS records could give some quadraphonic effect, although far from accurate, when played on an SQ decoder. The QS matrix system was employed to create the five-channel Quintaphonic Sound system used for première engagements of the 1975 film Tommy. The left and right 35 mm magnetic soundtracks were QS-encoded to create four channels around the cinema audience, while the centre mag track was assigned to the speaker behind the screen. The mag FX track was unused. This channel layout came close (5.0) to the now common 5.1 surround sound layout. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「QS Regular Matrix」の詳細全文を読む スポンサード リンク
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