GUIDE TO INSTALLATION AND OPERATION
60
| XVP-3901
Silence sub-tab
This tab sets the card’s behavior in the event of a loss or
absence of audio signal. The Signal Presence indicators are
then triggered according to these setting
s:
Silence Detect:
select which audio channels to monitor for
audio silences by checking their boxes. This enables the
signal presence indicators to change color when there is no
signal present which activates the audio silence alarm.
Otherwise, when checkboxes are not checked, the signal
presence indicator turns grey and the audio silence alarm is
not activated
Threshold
: Signal absence is declared when the signal level
is lower than the signal threshold for a duration longer than
the No Signal Delay. The threshold can be set to
-72, -66, -
60, -54, -48
dBFS. The default value is –60 dBFS.
No Signal Delay:
The period for which signal must be
continuously absent before an alarm can be triggered can be
adjusted from 3 to 255 seconds in preset steps: 3, 5, 7, 10,
15, 20, 30, 40, 50, 60, 90, 120, 180, 210, 240, 255 sec. The default value is set to 15 seconds.
5.6.2 Downmix tab
This tab provides resources to control the downmix of a “5.1
channel” surround-sound audio signal into an LtRt or LoRo
stereo pair. The 5.1 terminology refers to six discrete audio
channels, with the low frequency effect (LFE) channel of
limited bandwidth designated as the “.1” channel. The
downmix can be done using any of the 32 audio channels
processed by the audio processor using the Input Channels
controls in the interface.
Input Channels:
Use the 6 pulldowns to select the source
channels for the downmix process.
Downmix:
Operating Mode: Use the pulldown to select the downmix
operating mode:
•
OFF: Downmix is disabled. Output channels pass
through unchanged.
•
Manual: Downmix follows the downmix parameters
manually configured by the user.
•
Follow Metadata Path 1: Downmix follows the downmix
parameters of Metadata Path 1.
•
Follow Metadata Path 2: Downmix follows the downmix
parameters of Metadata Path 2.
Level Normalization: use the pulldown to select the type of
normalization to be applied on the downmix output level.
Figure 5.42 Audio Processing - Silence sub-tab
Figure 5.43 Audio Processing - Downmix tab