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Circular Microphone Array for Discrete Multichannel Audio Recording.

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Traditional stereo microphone pair techniques for natural recording are quite capable for 2 channel stereo reproduction. However, for multichannel reproduction systems like 5.1, 7.1 and ambisonics compromises in terms of coverage, source localization and channel separation are unavoidable. The main reason for this is that microphones currently used only have low order directivity patterns (omni, figure-of eight, cardioid or hypercardioid) that cannot provide sufficient angular resolution to avoid unwanted cross talk between the recording channels. In this paper a discrete coincident 12 channel microphone is proposed in order to solve these problems. This microphone consists of a circular array with a radius of 1 meter using 288 microphone capsules whose output signals are combined into 24 channels using simple analog electronics. These 24 channels are captured using a multi-track computer interface and post-processed into 12 discrete reproduction audio channels.

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AES - Audio Engineering Society