Using a pair of coincident microphones, the microphone in front of the spindle is called the M microphone, and the other microphone with its 90 degree to the left and right sides is called the S microphone. The M microphone can be a heart-shaped, 8-shaped or directional microphone. The S microphone must use 8 directional microphones. In this system, the stereo image depends not only on the directivity of the M microphone, but also on the relative relationship between the M and S signals. That is, the larger the S/M ratio is, the wider the stereo is.
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