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Stereophonic Sound with Two Tracks, Three Channels By Means of a Phantom Circuit (2PH3)

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Recent experiments by the author have resulted in a workable three-channel reproducing system in which the center channel is recovered from the conventional pair of input channels by combination. The output of each flanking channel is attenuated 3 db to preserve balance. Practical circuit details are given, and subjective listening results described.

JAES Volume 6 Issue 2 pp. 118-123; April 1958
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AES - Audio Engineering Society