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A Triphonic Sound Reproduction System Using Coincident Microphones

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Through experimentation into phantom image localization from both in-phase and antiphase sources, a sound reproduction system has been devised which requires only three audio channels. The system uses a coincident array of microphones to generate signals which may be applied to three loudspeakers directly. The system provides accurate localization only in the forward half of the horizontal plane. However, a sense of immersion and ambience is felt from the rear.

JAES Volume 27 Issue 12 pp. 965-969; December 1979
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AES - Audio Engineering Society