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Stereophonic sound
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===M/S technique: mid/side stereophony=== [[File:MS stereo.svg|thumb|Mid/side stereo microphone technique]] This coincident technique employs a bidirectional microphone facing sideways and another microphone at an angle of 90Β°, facing the sound source. The second microphone is generally a variety of cardioid, although [[Alan Blumlein]] described the usage of an omnidirectional transducer in his original patent. The left and right channels are produced through a simple matrix: left = mid + side; right = mid β side (the polarity-reversed side signal). This configuration produces a completely mono-compatible signal and, if the mid and side signals are recorded (rather than the matrixed left and right), the stereo width can be manipulated after the recording has taken place. This makes it especially useful for film-based projects.
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