evertz 7800 - Configuring the AES Outputs; AES Output Screen

7800 MultiFrame Manual
7812DCDA2Q-HD (-AA, –AES4) Dual Path HDTV Down-converter
Revision 1.0 Page 65
No Scaling
If no normalization is applied, the stereo down-mix usually sounds at the
similar levels as the 5.1 audio input, but clipping may occur when input sound
level is close to 0dB FS.
Overflow Scaling
Select Overflow Scaling to normalize the matrix coefficients. Normalization of
matrix coefficients will avoid any possibility of overflow, but it tends to lower
the loudness level when compared against the original 5.1 input.
7.11.3. Setting the Output Gain
This control enables the user to configure the output gain. To adjust the output gain control, drag the slider
right to increase the gain value or drag the slider left to decrease the gain control. The output gain ranges
from -20 dB to +20 dB in 0.1 dB increments.
7.11.4. Setting the LFE Mixing Control
This control enables the user to control whether the LFE channel is included or not in the audio down-
mixing. Note that the LFE Gain control is in effect only when LFE Gain is selected. The LFE Mixing Control
drop down menu provides the following options:
No Mixing
The LFE channel will not be included in the down-mix.
LFE Gain
The LFE channel will be included in the down-mix with gain for the LFE
channel defined by the LFE Gain control.
7.11.5. Setting the Surround Phase Control
This control manages whether no phase shift (0 degrees) or a 90 degree phase shift is applied to the
surround channels before being passed to the 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 the
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-mix.
90 degrees
A 90 degree phase shift is applied to the surround channels before being
passed to down-mix.