This paper introduces the microphone techniques for recording an orchestra with three-dimensional multichannel sound and discusses the spatial impression provided by the recorded sound of an orchestra. Listeners in a concert hall simultaneously hear both a direct sound arriving from each musical instrument and an indirect sound reflected from the walls and the ceiling. Concerning a direct sound, existing microphone techniques can be used for three-dimensional multichannel sound with necessary modification, but new microphone techniques should be developed for an indirect sound. This paper will propose the microphone technique consisting of a main microphone array and an ambience microphone array, which will enable us to control spatial impressions easily and realize the stable sound source localization.
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