Grass Valley 8920ADT - Manual (Page 31)

8920ADT Instruction Manual 25
Functional Description
Functional Description
Figure 13. The 8920ADT converts two channels of analog audio into one 48
kHz sample-rate serial data stream, which is then delayed and converted
into an AES/EBU formatted output signal. Refer to the block diagram in
Figure 14 while reading the following functional description.
Figure 14. 8920ADT Block Diagram
8067_01
2 AES3id
Outputs or
1 AES3
Balanced
Output
+/- 12V
Delay Control I/F
RS232
Buffered
RS232 Out
To 8900NET
Module
Mode, Control,
Gain/Delay
Front Controls
Power
Supply
Left
Audio
Input
VCXO Loop Filter
Phase
Detector
VCXO
Fault, Comm, Conf,
Pwr, Rem Ovr
LEDs
Tracking, Ref Locked,
Left/Right Clip,
Left/Right >-20dBFS
LEDs
Loop Filter
Phase
Detector
Line
Drivers
Audio
Delay
Memory
Right
Audio
Input
Ref
Input
Adj Gain
Stage
2-Channel
A/D
Serial Audio Data
Pre A/D Gain Control
H/V Sync
Odd/Even
Video/AES3id
AES Word Clock
Reference
Loop-through
48 Hz/AES
AES/EBU Serial Data
Control
Address
Data
FPGA
Routing and Control
Processor
Word Clock
Receiver
Controller
Sync Separator