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Surround sound formats
Below is a brief description of the main surround sound
formats you’ll find on BDs, DVDs, satellite, cable and
terrestrial broadcasts, and video cassettes.
Dolby
The Dolby technologies are explained below. See
www.dolby.com for more detailed information.
Manufactured under license from Dolby Laboratories.
Dolby, Pro Logic, Surround EX and the double-D symbol are
trademarks of Dolby Laboratories.
DTS
The DTS technologies are explained below. See
www.dtstech.com for more detailed information.
Manufactured under license under U.S. Patent #’s:
5,451,942; 5,956,674; 5,974,380; 5,978,762; 6,226,616;
6,487,535; 7,212,872; 7,333,929; 7,392,195; 7,272,567 &
other U.S. and worldwide patents issued & pending. DTS
and the Symbol are registered trademarks, & DTS-HD, DTS-
HD Master Audio, and the DTS logos are trademarks of
DTS, Inc. Product includes software. © DTS, Inc. All Rights
Reserved.
Windows Media Audio 9 Professional
Windows Media Audio 9 Professional (WMA9 Pro) is a
discrete surround format developed by Microsoft
Corporation.
Windows Media and the Windows logo are trademarks or
registered trademarks of Microsoft Corporation in the
United States and/or other countries.
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
error
s that occur. 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 experie
nce 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
parame
ters in
both the digital and analog domain.
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