The accelerating sales of Dolby Surround Sound equipment shows
that spatial sound is very much appreciated
by music audiences. During
the development of a surround decoder,
it was thought sensible to use a
third sound channel. the centre
channel, with standard stereo recording.
To prevent the sound of this
channel drowning out the other two,
its mono signal is formed from part of
the sound of the two stereo channels.
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