the mid-side technique

treating the mid and side frequency response differently

treating two channels frequency response differently

The mid-side (M-S) stereo technique is one of the two formats of “intensity stereo,” that is, stereo in which spatial localization is determined by the differences in the intensity of a sound wave as it arrives in phase at a coincident pair of microphones. Intensity stereo relies completely on the directional characteristics (polar patterns) of the microphone pair to produce this effect, since only intensity differences and not phase differences exist between the channels for any single source arriving at a coincident pair.

(Source: “M-S Stereo: A Powerful Technique for Working in Stereo” by Wesley L. Dooley and Ronald D. Streicher)

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