Denon AVC-A1HD Owner's Manual download pdf (Page 89)

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Getting Started Connections Setup Playback Remote Control Multi-Zone Troubleshooting

Adaptive Decorrelation™

In a movie theater, a large number of surround speakers help create an

enveloping surround sound experience, while in a home theater 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 theater.

THX Ultra2™

Before any home theater component can be THX Ultra2 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 Ultra2 logo, which is your guarantee that the Home

Theater products you purchase will give you superb performance for

many years to come. THX Ultra2 requirements cover every aspect

of the product including power ampliﬁer performance, pre-ampliﬁer

performance and operation, as well as hundreds of other parameters

in both the digital and analog domain.

In addition to improvements to the power ampliﬁer with respect to

previous THX Ultra standards, three surround modes have been

added: the THX Ultra2 Cinema mode, THX Music Mode and THX

Games Mode.

THX Ultra2 Cinema

THX Ultra2 Cinema mode plays 5.1 movies using all 8 speakers giving

you the best possible movie watching experience. In this mode, new

THX processing blends the side surround speakers and back surround

speakers providing the optimal mix of ambient and directional surround

sounds.

DTS-ES (Matrix and 6.1 Discrete) and Dolby Digital Surround EX

encoded soundtracks will be automatically detected in Ultra2 Cinema

mode if the appropriate ﬂag has been encoded.

Some Dolby Digital Surround EX soundtracks are missing the digital

ﬂag that allows automatic switching. If you know that the movie that

you are watching is encoded in Surround EX, you can manually select

the THX Surround EX playback mode, otherwise THX Ultra2 Cinema

mode will apply processing to provide optimum replay.

THX Music Mode

For the replay of 5.1 multi-channel music the THX Music Mode should

be selected. In this mode new THX processing is applied to the

surround channels of all 5.1 encoded music sources such as DTS and

Dolby Digital to provide a wide stable rear soundstage.

THX Games Mode

For the replay of stereo and multi-channel game audio the THX Games

Mode should be selected. In this mode THX ASA processing is applied

to the surround channels of all 5.1 and 2.0 encoded game sources

such as analog, PCM, DTS and Dolby Digital. This accurately places all

game audio surround information, providing a full 360 degree playback

environment. THX Games Mode is unique as it gives you a smooth

transition of audio in all points of the surround ﬁeld.

ASA (Advanced Speaker Array)

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) placing

the two Surround Back speakers close together facing the front of the

room as shown in the diagram will provide the largest sweet spot. If

for practical reasons you have to place the Surround Back speakers

apart, you will need to go 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 new modes; THX Ultra2 Cinema, THX Music

Mode and THX Games Mode.

Boundary Gain Compensation

If your chosen listening room layout (for practical or aesthetic reasons)

results in the most of the listeners being close to the rear wall, the

resulting bass level can be sufﬁciently reinforced by the boundary

that the overall sound quality becomes “boomy”. THX Ultra2 receivers

and controllers contain the BGC (Boundary Gain Compensation)

feature to provide an improved bass balance. BGC can be selected

by choosing “THX Ultra2 Subwoofer–Yes” from the “Boundary Gain

Compensation” section of the THX Audio setup menu.

THX and Re-EQ, THX Timbre Matching, THX Adaptive Decorrelation,

and THX Advanced Speaker Array are trademarks of THX Ltd. THX

In 1999, a new surround system was launched simultaneously

with the release of the movie “Star Wars Episode I”. “Dolby Digital

Surround EX” is a new movie sound track that greatly enhances

the sense of spatial expression and the positioning of the surround

channel sound. The result is 360 degrees of movement and moving

sound effects that seem to pass right over the listener’s head. This

system was developed jointly by THX and Dolby Laboratories, fusing

THX’s idea of improving spatial expression and achieving a uniform 360

degree sound positioning with Dolby Laboratories’ matrix encoding

technology. Emphasis was placed on compatibility with the existing

system Dolby Digital 5.1 channel, and the new “surround back (SB)

channel” was added to achieve improvements over the conventional

5.1 channel system in terms of the positioning of the sound at the

rear, the acoustic image of sound moving from the two sides to the

back as well as sound moving from the front to the center rear with

the multi surround speaker systems used in movie theaters, thereby

enabling various types of surround sound. The surround back channel

signal is a matrix-encoded signal inserted into both the Dolby Digital

SL (surround left) and SR (surround right) channels. Upon playback, the

signals are decoded by a high precision digital matrix decoder within

the Dolby Digital decoder into the SL, SR and SB channels and output

as 6.1 channels of signals. With the AVC-A1HD, the signals further

undergo Home THX Cinema processing to achieve a THX Surround

EX system. Even without the proper environment for playing the SB

channel, Dolby Digital Surround EX signals are 100% compatible with

existing 5.1 channel playback systems, so they can be played as such.

In this case, the SB channel signal is produced as a monaural signal

from both the SL and SR channels, so none of the signal components

are missing. The effects speciﬁc to THX Surround EX (the sense of

spatial expression and the positioning of the sound), however, are the

same as with conventional 5.1 channel surround systems.

Timbre Matching™

The human ear changes our perception of a sound depending on the

direction from which the sound is coming. In a movie theater, there

is an array of surround speakers so that the surround information is

all around you. In a home theater, only two speakers located to the

side of your head are used. 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.

THX™ Surround EX™

Information

THX and Ultra2 are trademarks of THX Ltd. THX may be registered

trademark of Dolby Laboratories. Used with permission.

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