Grass Valley DAP-1781 - Manual (Page 27)

GUIDE TO INSTALLATION AND OPERATION
DAP-1781 | 27
4.1.1.2 Fixed Delay sub-tab
For each channel, two sliders allow delay to be
adjusted, with two levels of precision:
• Coarse – adjusts the delay in ms, from -250
ms to 2400 ms
• Fine – adjusts the delay in sample
increments, from -47 to 47.
Input data boxes are available to enter numerical
values directly.
The displayed value gives the delay between a card
input and a digital output.
The negative values will be applied only when the
DAP-1781 is slave of a video card via A-BUS. The
positive small values desired have to be larger than
the minimum processing delay to be effective.
If only one channel is non-PCM, the input sample
rate converter is bypassed for both channels
together; the remaining audio PCM channel will
pass with its original sample rate, and possibly not
synchronized to the reference.
When a pair of channels is non-PCM, the even
channel setting is masked and the odd channel
setting is applied to both channels.
Note: an access is given through the Metadata tab
to apply a fixed delay to the selected input
Metadata signal only.
4.1.1.3 Config sub-tab
This tab sets the card’s behavior in the event of a
loss or absence of audio signal.
• A signal absence is declared when the signal
level is lower than the signal threshold
during the selected period. The threshold
can be set through the pull-down box to –72, -
66, -60, -54 or -48 dBFS, the default value is
–60 dBFS.
Delay: the amount of time for which the signal must
be below the threshold before a signal absence
error is reported can be adjusted from 0 to 255
seconds. The default value is set to 15 s, and an
input box is available to enter a numerical value
directly