Grass Valley AMX-3981 2014 - Manual (Page 32)

GUIDE TO INSTALLATION AND OPERATION
26 | AMX-3981
5.4.1 Audio Proc – Levels tab
Grouped by pairs of channels, each channel has the
following controls:
Level (slider and input box): Sets the audio gain from -96
to 12 dB in 0.5 dB steps. For non-PCM audio, the level
value is overridden to 0 dB.
Mute (speaker button): Mutes the selected audio channel
Phase Invert: When checked, inverts the selected audio
channel phase.
Lock: “Locks” both channel sliders together for levels, so
that moving one slider moves the other one as well.
5.4.2 Audio Proc – Fixed Delay tab
Fixed Delay sub-tab: although the AMX-3981 automatically
matches audio and video throughput timing, provision is
made for the user to insert an audio delay offset from the
nominal value, in order to deal with problems such as lip-
sync errors and audio phase alignment in the incoming feed.
For each channel, two sliders allow the delay to be adjusted.
• Coarse – adjusts the delay in milliseconds, over a
range of values that depends on the Reference and
the Frame Delay set on the timing tab in the Video
Input/Output panel (see page 18), as follows:
With Reference:
Additional Adjustment Adjustment
Frame Delay Range Range
(59.94 Hz) (50 Hz)
0 0 to 2000 ms 0 to 2000 ms
1 -33 to 2000 ms -40 to 2000 ms
2 -66 to 2000 ms -80 to 2000 ms
3 -99 to 2000 ms -120 to 2000 ms
… … …
15 -500 to 2000 ms -600 to 2000 ms
Figure 5.13 Audio Processing - Channels - Levels
Figure 5.14 Audio Processing – Channels - Fixed delay