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  • From Wikipedia, the free encyclopedia (Redirected from Quadraphony) "Quadraphony: Developments in Matrix H decoding" (PDF). BBC Research Department Report. — “Quadraphonic sound - Wikipedia, the free encyclopedia”,
  • My career in electronics led to my invention of the Tate Directional Enhancement System in 1973, a quadraphonic decoder for the SQ and QS systems. 31 January 2007 Edited the Quadraphony page to add a footnote referencing the patent. — “User:Martinwill2 - Wikipedia, the free encyclopedia”,
  • It may require general cleanup to meet Wikipedia's quality standards. a practice which would later give rise to the matrices used in quadraphony, achieved the 45/45 groove. — “Gramophone record - Wikipedia, the free encyclopedia”,


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