How MTS Works
The first channel is the stereo difference (left minus right), used to add stereophonic sound to the existing monophonic (the left plus right stereo sum) audio track.
In other words the normal mono television audio consists of L+R information. A second signal (MTS) rides on top of this mono carrier wave. This MTS signal consists of L minus R.
- When the two audio channels are added together, or summed (L+R plus L-R), the left channel is derived.
- When the second audio channel is subtracted from the first by a phase reversal (L+R minus L-R), the right channel is derived.
Read more about this topic: Multichannel Television Sound
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