Operating instructions

GUIDE TO INSTALLATION AND OPERATION
FRS-1801 | 21
Fixed Delay sub-tab: although the FRS-1801 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
Additional Frame Delay set in the Timing
panel (see page 17), as follows:
Additional
Frame Adjustment Adjustment
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
… … …
7 -231 to 2000 ms -280 to 2000 ms
• Fine – adjusts the delay in audio sample
increments, from -100 to +100 samples.
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 settings:
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
indicators turns grey when there is no signal present
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 OFF or to a specific value: -
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.
Figure 3.18 Audio Processing – Silence sub-tab
Figure 3.17 Audio Processing – Fixed Delay sub-tab