Bang & Olufsen BeoVision Avant - Technical Sound Guide - Manual (Page 12)

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Setup: Sound: Sound Modes: PRESETNAME: Advanced Settings: Spatial Controls: Processing
There are many cases where the number
of input channels in the audio signal
does not match the number of
loudspeakers in your configuration. For
example, you may have two
loudspeakers, but the input signal is
from a multichannel source such as a
5.1-channel DVD or a 7.1-channel Blu-ray.
In this case, the audio must be
‘downmixed’ to your two loudspeakers if
you are to hear all components of the
audio signal. Conversely, you may have a
full surround sound system with 7 main
loudspeakers and a subwoofer (a
7.1-channel system) and you would like
to re-distribute the two channels from a
CD to all of your loudspeakers. In this
example, the signal must be ‘upmixed’
to all loudspeakers.
Bang & Olufsen’s TrueImage is a
processor that accomplishes both of
these tasks dynamically, downmixing or
upmixing any incoming signal so that all
components and aspects of the original
recording are played using all of your
loudspeakers.
Of course, using the TrueImage
processor means that signals in the
original recording are re-distributed. For
example, in an upmixing situation,
portions in the original Left Front signal
from the source will be sent to a number
of loudspeakers in your system instead
of just one left front loudspeaker. If you
wish to have a direct connection
between input and output channels,
then the Processing should be set to ‘1:1’,
thus disabling the TrueImage processing.
Note that, in 1:1 mode, there may be
instances where some input channels
will not be heard. For example, if you
have two loudspeakers but a multi–
channel input, only two input channels
will be audible. These channels are
dependent on the speaker roles selected
for the two loudspeakers. (For example,
if your loudspeakers’ roles are Left Front
and Right Front, then only the Left Front
and Right Front channels from the
multichannel source will be heard.)
Similarly, in 1:1 mode, if you have a
multichannel configuration but a two-
channel stereo input, then only the Left
Front and Right Front loudspeakers will
produce the sound – all other
loudspeakers will be silent.
If TrueImage is on and if the number of
input channels and their channel
assignments matches the speaker roles,
and if all Spatial Control sliders are set
to the middle position, then the
TrueImage processing is bypassed. For
example, if you have a 5.1 loudspeaker
system with 5 main loudspeakers (Left
Front, Right Front, Centre Front, Left
Surround, and Right Surround) and a
subwoofer, and the Spatial Control
sliders are in the middle positions, then
a 5.1 audio signal (from a DVD, for
example) will pass through unaffected.
However, if the input is changed to a 2.0
source (i.e. a CD) then the TrueImage
processor will upmix the signal to the 5.1
outputs.
In the case where you wish to have the
benefits of downmixing without the
spatial expansion provided by upmixing,
you can choose to use the DOWNMIX
setting in this menu. For example, if you
have a 5.1-channel loudspeaker
configuration and you wish to downmix
6.1- and 7.1-channel sources (thus
ensuring that you are able to hear all
input channels) but that 2-channel
stereo sources are played through only
two loudspeakers, then this option
should be selected. Note, however, that
the four advanced Spatial Controls
(Surround, Height, Stage Width and
Envelopment) will be disabled in the
DOWNMIX processing mode. Also note
that, in DOWNMIX mode, there are two
0º
30º
90º
140º
60º
110º
Centre
Front
Right
Front
Right
Wide
Right
Surround
Right
Back
Centre
Back
180º
Right
Surround
Height
Ceiling
Centre
Front
Height Right
Front
Height
Ceiling
Front
Height
Front
Wide
Surround
Height
Back
Surround
Figure 7: Loudspeaker positions associated
with the speaker roles available in the
television. The TrueImage processor delivers
a unique output to each of these output
channels.
Figure 8: Side view of the loudspeaker positions associated with the speaker roles available in
the television
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