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A Stereo Program Phase Checker

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Stereo programs derived from multiple-track studio masters normally contain left, right, and various L+R combinations to create -center- channel information. Should the phase of one stereo channel become reversed, the reproduced center information loses its spatial relationship or, in the case of monophonic reproduction, may disappear entirely. Details of an easily constructed go/no-go device for checking phase of stereo program material are presented.

JAES Volume 20 Issue 1 pp. 39-41; February 1972
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AES - Audio Engineering Society