Crystal Vision
Using card edge controls
The sample rate mode for each channel can be controlled from the card edge using the
third lever of the DIL switch as explained in the following table:
Lever Function
3
Down = Auto (30-50kHz) mode, Up = Xtal (48kHz) mode
Note:
GPI connections to the Auto/ Xtal mode change line will override the card edge switch if
asserted to a logic low or grounded.
Channel swapping, single channel mode and phase inversion
Channel routing logic following the silence detection circuits allows the incoming
analogue signals to be assigned to digital outputs in a variety of ways.
The possible variations are as follows:
•
channels may be swapped so that Input 1 feeds AES Output 2 and Input 2 feeds AES
Output 1
•
both output stages may be assigned to either Input 1 or Input 2 effectively doubling
the duplicate outputs for a single analogue input.
•
the phase of the right output of AES Output 1
OR
AES Output 2 may be inverted
The various channel shuffling modes are selected as follows:
Lever Function
5
Down = Channels swapped, Up = Normal
6
Down = SINGLE channel mode, Up = DUAL mode
(Note: Lever 3 = Down will swap channels so Input 2 feeds all outputs)
7
Down = CH 1 output RHS inverted, Up = CH1 normal
8
Down = CH 2 output RHS inverted, Up = CH2 normal
Note:
GPI connections to the shuffling mode lines will override card edge switches if asserted to a
logic low or grounded.
Setting channel gain and input termination
Please refer to the Hardware configuration section of the Installation chapter for channel
gain and input termination settings.
Selecting silence warning options
Each input channel is equipped with ‘near silence’ detectors. If the audio signal levels are
sustained at below –50dBFS for more than a selected period of time, a LED indicator for
each channel comes on and an appropriate GPI output can be asserted low. DIP switch
SW3-4 can be used to prevent silence detection from raising alarms via these GPI outputs.
ADCA412 User Manual R2.1
20
30 October 2018
