7800/7700 MultiFrame Manual
7812UDXD Series 3G/HD Up/Down/Cross Converter with Simultaneous Dual Format Outputs and AES I/O
Revision 1.1.1
Page - 149
6.43.1.5. Surround Phase Control
This control manages whether or not a 90 degree phase shift is applied to the surround channels before
being passed to down-mix matrix. Select 0 degree if no 90-degree phase shift is needed. It is required
that surround channels are 90-degree phase shifted for Dolby Prologic I decoding, but if surround
channels in the 5.1 audio input are already 90-degree phase shifted, then user should select 0 degree to
avoid double 90-degree phase shifting. Normally, the 90 degrees phase shift is applied. The
Surround
Phase
drop down menu appears as follows:
0 degrees
No phase shift is applied to the surround channels before being
passed to down.
90 degrees
A 90 degree phase shift is applied to the surround channels before
being passed to down.
6.43.2. Coefficient Control
6.43.2.1. Custom Down Mix Type Control Settings
When the
Down Mix Type
is set to
Custom
the following equation will be used to generate the down-
mixed audio.
norm
gain
LFE
lfe
Rs
Rs
Ls
Ls
C
C
L
LR
L
gain
levL
levL
lev
lev
÷
×
×
+
°
°
×
+
°
°
×
+
×
+
×
=
)
}
90
/
0
{
}
90
/
0
{
(
norm
gain
LFE
lfe
Rs
Rs
Ls
Ls
C
C
R
LR
R
gain
levR
levR
lev
lev
÷
×
×
+
°
°
×
+
°
°
×
+
×
+
×
=
)
}
90
/
0
{
}
90
/
0
{
(
Where
gain
lfe
is controlled by LFE Mixing and LFE Gain,
gain
is controlled by Output Gain and
norm
is
controlled by Output Scaling Mode and where
lev
LR
,
lev
C
,
levL
Ls
,
levL
Rs
,
levR
Ls
and
levR
Rs
are custom
specified user coefficients. These custom down-mixing coefficients are controlled using the appropriate
slider bars in the
Down Mix Type
control section as shown below.
lev
LR
: Ranges from 1.000 to –1.000 in increments of .001 increments.
lev
C
: Ranges from 1.000 to –1.000 in increments of .001 increments.
levL
Ls
: Ranges from 1.000 to –1.000 in increments of .001 increments.
levL
Rs
: Ranges from 1.000 to –1.000 in increments of .001 increments.
levR
Ls
: Ranges from 1.000 to –1.000 in increments of .001 increments.
levR
Rs
: Ranges from 1.000 to –1.000 in increments of .001 increments.