1958•IRE Transactions on AudioRequires access

The columbia compatible stereophonic record

Peter C. Goldmark, Benjamin B. Bauer, W. S. Bachman

Abstract

A "compatible" stereophonic record is one which will reproduce full stereophonic sound when played on a stereophonic phonograph and will be indistinguishable from an LP record when played on a monaural phonograph. Such a record may be obtained by recording the sum signal S=L+R as lateral modulation and the difference signal D=L-R as vertical modulation and suitably modifying D so that the tracking possibilities of monaural pickups are not exceeded.

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Key concepts: Stereophonic sound, Monaural, Phonograph, SIGNAL (programming language), Acoustics, Frequency modulation, Modulation (music), Noise (video)