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About THX
The THX technologies are explained below. See
www.thx.com for more detailed information.
THX Cinema processing
THX is an exclusive set of standards and technologies established by
THX Ltd. THX grew from George Lucas’ personal desire to make your
experience of the film soundtrack, in both movie theatres and in your
home theatre, as faithful as possible to what the director intended.
Movie soundtracks are mixed in special movie theatres called
dubbing stages and are designed to be played back in movie theatres
with similar equipment and conditions. This same soundtrack is then
transferred directly onto Laserdisc, VHS tape, DVD, etc., and is not
changed for playback in a small home theatre environment. THX
engineers developed patented technologies to accurately translate
the sound from the movie theatre environment into the home,
correcting the tonal and spatial errors that
oc
cur. On this product,
when the THX indicator is on, THX features are automatically added
in Cinema modes (e.g. THX Cinema, THX Surround EX).
Re-Equalization
The tonal balance of a film soundtrack will be excessively bright and
harsh when played back over audio equipment in the home because
film soundtracks were designed to be played back in large movie
theaters using very different professional equipment. Re-Equalization
restores the correct tonal balance for watching a movie soundtrack in
a small home environment.
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.
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 experienc
e as in a movie theatre.
THX Select2 Plus
Before any home theatre component can be THX Select2 Plus
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 Select2 Plus logo, which is your guarantee
that the Home Theatre products you purchase will give you superb
performance for many years to come. THX Select2 Plus requirements
cover every aspect of the product including pre-amplifier and power
amplifier performance and operation, and hundreds of other
parameters
in both
the digital and analog domain.
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 ex
h
ibit 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.
Only amplifier 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.
Boundary Gain Compensation™
Depending on the listener’s and the subwoofer’s position, the listener
may experience an excessive bass effect. This feature compensates
for excessive bass resulting from a boundary gain effect. This feature
is designed to operate when used with a subwoofer certified to THX
Select2™ specifications.
THX Loudness Plus Description
THX Loudness Plus is a new volume control technology featured in
THX Ultra2 Plus™ and THX Select2 Plus™ Certified amplifiers. With
THX Loudness Plus, home theater audiences can now experience the
rich details in a surround mix at any volume level. A consequence of
turning the volume below Reference Level is that certain sound
elements can be lost or perceived differently by the listener. THX
Loudness Plus compensates for the tonal and spatial shifts that occur
when the volume is reduced by intelligently adjusting ambient
surround channel levels and frequency response. This enables users
to experience the true impact of soundtracks regardless of the volume
setting. THX Loudness Plus is automatically applied when listening in
any THX listening mode. The new THX Cinema, THX Music, and THX
Games modes are tailored to apply the proper THX Loudness Plus
settings for each type of
c
ontent.
ASA Description
ASA is a proprietary THX technology which processes the sound fed
to 2 side and 2 back surround speakers to provide the optimal
surround sound experience. When you set up your home theater
system using all eight speaker outputs (Left, Center, Right, Surround
Right, Surround Back Right, Surround Back Left, Surround Left and
Subwoofer), be sure to go to the THX Audio Set-up screen and choose
the setting that most closely corresponds to the speaker spacing,
which will re-optimize the surround sound-field. ASA is used in three
modes; THX Ultra2 Cinema, THX Ultra2 Music and THX Ultra2 Games.
VSX-1120_UXJCB.book 95 ページ 2010年3月10日 水曜日 午後2時2分
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