Miranda FRS-3901, Руководство по установке и эксплуатации

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GUIDE TO INSTALLATION AND OPERATION
24 | FRS-3901
5.5.2 Audio Proc – Fixed Delay tab
Fixed Delay sub-tab : although the FRS-3901 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 16), 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
Without Reference:
Additional Adjustment Adjustment
Frame Delay Range Range
(59.94 Hz) (50 Hz)
1 -12 to 2000 ms -19 to 2000 ms
2 -45 to 2000 ms -59 to 2000 ms
3 -78 to 2000 ms -99 to 2000 ms
… … …
15 -479 to 2000 ms -579 to 2000 ms
•
Fine – adjusts the delay in audio sample increments,
from -100 to +100 samples.
5.5.3 Audio Proc – Silence 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.
Figure 5-13 Audio Processing – Channels - Fixed delay
Figure 5-14 Audio Processing - Channels – Silence