In musical sound recording, a forest of microphones is commonly observed. It is for good sound localization and favorable ambience, however the forest is desired to be sparse for less laborious setting up and mixing. For this purpose, the authors studied sound-image representation of stereophonic microphone arrangements utilizing Frequency Dependent Spatial Cross Correlation (FSCC), which is a cross correlation of two microphone's outputs. The authors firstly examined FSCCs of typical microphone arrangements for acquisition of ambient sounds and concluded that MS(Mid-Side) microphone system with setting directional azimuth at 132 degree is the best. The authors also studied conditions of on-stage sounds acquisition and resulted that FSCC of co-axial type microphone takes the constant value of +1, which is advantageous for stable sound localization. Thus the authors further compared additional sound acquisition characteristics of MS system (setting directional azimuth at 120 degree and XY system. As a conclusion, the former is superior. Finally, the author proposed dual MS microphone systems. One is for on-stage sound acquisition set directional azimuth at 120 degree and the other is for ambient sound acquisition set directional azimuth at 132 degree.
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