10
Redbox User Handbook No 1
System Block Diagram
Fig 2-2: RB-ADDA2 System Block Diagram
Front Panel Controls & Indicators
The LED on the front panel is normally red to indicate that power is present on the unit.
SYNC Button & LEDs
This button will select one of the 4 operating modes for
the RB-ADDA2 Analogue to Digital conversion. 3 modes
use an external sync and this button is also used to select
the external sync source that generates the sampling
frequency used. The Mode button will flash when the
external sync signal selected is not present.
A/D SOURCE Select Button & LEDs
This button will select between the balanced and
unbalanced analogue audio inputs for the RB-ADDA2
Analogue to Digital conversion. The signal level
corresponding to full-scale digits can be set to +12, +18
or +24dBu.
FREQUENCY Set Button & LEDs
When the button is not illuminated it will select the internal
master frequency that is used in Master Mode and in Auto
Mode when no sync signal is present. At other times, when
the button is illuminated, the LEDs will show the actual
sampling frequency of the incoming sync source. To view
the Master Frequency press the button once to enter the
setting mode. Any further button presses will advance the
set frequency.
AES
Rec
AES/EBU
AES/EBU
Optical
Optical
Digital Source
Select
Analogue
Input Select
Rec
S/PDIF
S/PDIF
DAC
ADC
AES
Transmitter
Master
Clock
Generator
Digital Input
Digital
Output
L
R
L
R
Professional
Balanced
Word
Clock
Consumer
Unbalanced
Analogue
Input
L
R
L
R
Professional
Balanced
Consumer
Unbalanced
Frequency
Select
Analogue
Output
Gain
Gain
AES
Rec
AES/EBU
Sync Input
Fig 2-3: SYNC Button & LEDs
Fig 2-4: A/D SOURCE Select
Button & LEDs
Fig 2-5: FREQUENCY Set
Button & LEDs
DIGITAL AUDIO CONVERTERS
2
DIGIT
AL A
UDIO C
ONVERTERS - RB
-ADD
A2
