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GLOSSARY
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Timbre Matching
The human ear changes our perception of a sound
depending on the direction from which the sound is
coming. In a movie theatre, there is an array of surround
speakers so that the surround information is all around
you. In a home theatre, you use only two speakers located
to the side of your head. The Timbre Matching feature
filters the information going to the surround speakers so
that they more closely match the tonal characteristics of
the sound coming from the front speakers. This ensures
seamless panning between the front and surround
speakers.
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Adaptive Decorrelation
In a movie theatre, a large number of surround speakers
help create an enveloping surround sound experience, but
in a home theatre there are usually only two speakers. This
can make the surround speakers sound like headphones
that lack spaciousness and envelopment. The surround
sounds will also collapse into the closest speaker as you
move away from the middle seating position. Adaptive
Decorrelation slightly changes one surround channel's
time and phase relationship with respect to the other
surround channel. This expands the listening position and
creates--with only two speakers--the same spacious
surround experience as in a movie theatre.
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THX Select
Before any home theatre component can be THX Select
certified, it must incorporate all the features above and
also pass a rigorous series of quality and performance
tests. Only then can a product feature the THX Select
logo, which is your guarantee that the Home Theatre
products you purchase will give you superb performance
for many years to come. THX Select requirements cover
every aspect of the product including power amplifier and
pre-amplifier performance and operation, and hundreds of
other parameters in both the digital and analog domain.
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THX Surround EX
THX Surround EX - Dolby Digital Surround EX is a joint
development of Dolby Laboratories and the THX Ltd.
In a movie theater, film soundtracks that have been
encoded with Dolby Digital Surround EX technology are
able to reproduce an extra channel which has been added
during the mixing of the program. This channel, called
Surround Back, places sounds behind the listener in
addition to the currently available front left, front center,
front right, surround right, surround left and subwoofer
channels. This additional channel provides the opportunity
for more detailed imaging behind the listener and brings
more depth, spacious ambience and sound localization
than ever before.
Movies that were created using the Dolby Digital
Surround EX technology, when released into the home
consumer market may exhibit wording to that effect on the
packaging. A list of movies created using this technology
can be found on the Dolby web site at www.dolby.com. A
list of available DVD software titles encoded with this
technology can be found at www.thx.com.
Only receiver and controller products bearing the THX
Surround EX logo, when in the THX Surround EX mode,
faithfully reproduce this new technology in the home.
This product may also engage the THX Surround EX
mode during the playback of 5.1 channel material that is
not Dolby Digital Surround EX encoded. In such case the
information delivered to the Surround Back channel will
be program dependent and may or may not be very
pleasing depending on the particular soundtrack and the
tastes of the individual listener.
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ITU-R
ITU-R is the radio communication sector of the ITU
(International Telecommunication Union). ITU-R
recommends a standard speaker placement which is used
in many critical listening rooms, especially for mastering
purposes.
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