Lexicon CP-1 Theory Of Operation page 25

Multi-Channel Music & Cinema Systems
Theory and Design
22
Research at Lexicon has taken the possiblities of THX decoding to a further
level with the introduction of true 7 channel decoding using a stereo
surround process. This option is available via the Surround Effect param-
eter in THX Cinema, and is further refined in the Logic 7 effect. A variety of
surround film effects allows you to have the highest possible sound quality
for video material — whether you select classic monaural movies or the
latest releases with all of their special effects — simply by changing effects.
Recent advances in film sound include discrete digital surround formats
such as Dolby Digital AC-3) and Digital Theater Systems (DTS) digital
surround. Unlike analog matrix-encoded formats such as Dolby surround,
with its mono, band-limited surround channel, these formats have two
completely independent surround channels. As a result, film sound engi-
neers can implement true stereo surround effects, providing theater audi-
ences with an expanded sense of depth, localization and overall realism.
Today, films with Dolby Digital and DTS soundtracks can be found on
digital media such as the laserdisc and DVD formats. As the acoustics,
equalization curves and speaker arrays used in mixing are the same,
whether mixing a four-channel analog matrix soundtrack, or a 5.1 digital
soundtrack,. Dolby Digital and DTS 5.1 channel soundtracks played back
through Lexicon processors have more spatial realism, and a more cin-
ematic presentation.
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