Ambience in stereophonic recording is mostly determined with main microphone system. The authors examined the effect utilizing Frequency-dependent Spatial Cross Correlation (FSCC), which is defined as a cross correlation of two outputs of the abovementioned microphone system. If recording sound field is diffusive, the above FSCC is desired to be zero. However, actual FSCC varies within -1 to 1 depending on frequency, that is brought by microphone’s directionality and location. The authors theoretically analyzed FSCCs of typical main microphone systems such as AB system, ORTF system, WF system, and MS system, and discovered that FSCC of MS system becomes uniformly zero under condition when its azimuth of directional angles is set at 132degree. This was proven experimentally, and excellently ambient recording was achieved.
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