The aim of this paper is to describe a series of adaptations of stereo microphone techniques for surround sound. The adaptations provide variable microphone polar patterns, multiple outputs for surround sound, as well as retaining a conventional 2 channel stereo output. The system enables the recording engineer to position and adjust the microphone cluster for a conventional stereo output and then derive the surround sound outputs. It is also possible to record the microphone outputs separately, and create the desired polar patterns in postproduction. The technique also has creative applications for multimicrophone or multi-track situations where a number of single microphones would be used.
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https://aes2.org/publications/elibrary-page/?id=13317
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