What are the different kinds of joint stereo?

Jan 13th, 2010 by dvdxplayer 2,864 views |Comments Off

Two of the most used joint stereo modes are IS (intensity stereo) and M/S (Mid/Side). M/S matrixing computes the sum and the difference of the two audio channels and stores these as two channels. This method is very efficient and is a lossless process, which means the two original channels can be extracted exactly as they were.

Intensity stereo replaces the left and right channels with a single signal plus directional information. This method is lossy and destroys DPL information. This method is only recommended at low bitrates.

Many encoders can use a combination of full stereo and either or both of these methods, deciding which to use on a per-frame basis.

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