UMX matrices provide optimal-localization directivity patterns with balance-invariant symmetry and orientation. These advantages over sum-difference matrixing permit specification of two low-distortion low-noise noncompandor narrow-band FM channels for linear time-invariant combination with optimal mono-stereo compatible baseband matrix channels. Development of this discrete-matrix QMX disc, with audio bandwidth to 18 kHz, top frequency below kHz, and simplified cutting, processing, and playing, is described.

Authors: Cooper, Duane H.; Shiga, Takeo; Takagi, Toshihiko
Affiliations: University of Illinois, Urbana, IL ; Nippon Columbia Company, Ltd., Kawasaki Japan(See document for exact affiliation information.)
JAES Volume 21 Issue 8 pp. 614-624; October 1973
Publication Date: October 1, 1973

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