<<When an MS recording is collapsed to mono (as still happens on some
television playback, for example), the side information is removed
from the sound altogether. So if you had an MS recording made in a
forest with a narrator close up in the centre and forest ambience in
the sides, when collapsed to mono the forest ambience disappears
altogether, totally changing the sound heard by the listener. So this
is 'mono-compatible' in terms of not causing comb filtering when
summed to mono, but not in terms of retaining all of the information
that was present in the original stereo signal!>>
If you create the mono by simply removing the Side channel, this is
more or less true, although all the ambience in the original Mid
channel still exists. If mono is created by summing the decoded MS
information the result will be identical to summed XY & will contain
all the side information collapsed to the center.
Scott Fraser
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