Grass Valley AMX-3981 2014 - Manual (Page 31)

GUIDE TO INSTALLATION AND OPERATION
AMX-3981 | 25
• Dolby E and Dolby Digital decoder module(s) – see note
• Linear Acoustic’s upMAX
tm
module(s)
• Downmix
Note – when the Dolby E or Dolby Digital and Dolby Digital
Plus encoder is installed, some audio processing channels will
not be available because they are used in the Dolby encoder
module. In that case, an extra tab will appear in this panel to
advise the user of the situation.
The 32 processed audio channels can be assigned later to the Dolby E or Dolby Digital and Dolby Digital Plus
encoder modules, the 3G/HD output embedder, the SD output embedder, or the discrete AES outputs. To use the
“Audio Processing” functionality, you must enable the audio option.
You can configure the audio processor differently for an SD input than for a 3G/HD input. The card will remember the
different parameters and will load them automatically without user intervention based on whether the video input is SD
or 3G/HD. Ensure the card has a video signal of the desired format before changing the configuration.
Group Detected section
Status indicators turn green when audio groups 1, 2, 3 or 4 are detected in the incoming signal. The Group Detected
warning color can be configured by the user in the Alarm Config panel (Sect. 5.16)
Discrete AES detected section: Status indicators turn green when an AES signal is detected on the indicated rear
panel AES input.
Signal Presence section
Signal presence indicators monitor the audio channel presence and are related to the Silence parameters defined in
the Ch XX/Silence tab (see details below): the indicator is green when an active signal is present and configurable
when a silence is detected according to the “no signal” threshold and the channel detection warning. The Signal
Presence warning color can be configured by the user in the Alarm Config panel (Sect. 5.16)
Under the Audio Proc tab are grouped controls for several aspects of the AMX-3981’s audio processing:
• levels
• delay
• silence detection
All of these parameters are adjusted individually for each channel, and channels are accessed in groups of four via
the first row of tabs in the panel. Below these tabs are the three tabs that access the parameters themselves.
In addition, control over Downmix is provided, and the status of all audio signals is monitored, under the appropriate
tabs.
Figure 5.12 Audio proc warning for Dolby encoders