Adjusting delay, Configuring output mode – Grass Valley 8920ADT User Manual
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8920ADT Instruction Manual
8920ADT Analog Audio to AES/EBU Converter with Delay Tracking
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Apply the maximum signal level to the input and adjust the paddle
switch for each channel until the clip LED comes on. This is -0.5 dBFS,
and by tapping the paddle switch four more times you will be within
0.15 dB (worst case) of the correct setting.
Adjusting Delay
For an AES/EBU signal the front paddle switch adds (up) or subtracts
(down) delay increments of 2 ms (1/16 video frame) each. Holding the
switch in either direction will cause the delay to step at regular intervals
until it is held for one to two seconds. After this interval, the rate of change
increases to 32 ms per step until the paddle is released or minimum or
maximum delay is reached. Both channels of audio are delayed together.
Note
Delay should be set without an auto-tracking signal input.
Configuring Output Mode
The 8920ADT provides thirteen possible output configurations as shown in
. The module can be configured using the rotary switch shown in
. To make a configuration setting, rotate the switch to
the desired output configuration. The 16-position rotary switch selects one
of 13 possible output modes. Positions B and C are not used and positions
0 and F select the same mode, the factory default.
Table 7. 8920ADT Output Mode Configuration
Switch
Position
Mode Description
0
Factory default – No phase inversion, channel swapping or summing.
1
Channel swap – Left and Right.
2
Both channels phase inverted.
3
Left channel phase inverted.
4
Right channel phase inverted.
5
Right channel to both channel outputs.
6
Left channel to both channel outputs.
7
Left plus Right to both channel outputs (-6 dB mono sum).
8
Left minus Right to both channel outputs.
9
Left plus Right to Left channel output and Left minus Right to Right channel output.
A
Left plus Right to both channel outputs and both channels phase inverted.
B
Not used (outputs AES silence).
C
Not used (outputs AES silence).
D
Tone 1 to all channels (AES Silence).
E
Tone 2 to all channels (1 kHz, -20 dBFS).
F
Factory default – No phase inversion, channel swapping or summing.