Grass Valley NV7512 v.1.3 - Manual (Page 38)

28 Rev 1.3 • 10 Oct 08
1. Introduction
Active Cards
Figure 1-21 shows the signal flow for a MADI synchronous output card.
Figure 1-21. MADI Synchronous Output Card Block Diagram
Analog
The analog output card (EM0589) receives outgoing signals from the crosspoint card and forwards
the signals to local DB25 connectors. Similar to the analog input card, the analog output card fea-
tures DIP switches that allow the operating level to be set to match the operating level of the facil-
ity. (See
Operating Levels on page 89.) This means for less degradation when converting the signal
from digital back to analog.
The analog output card can receive up to 16 stereo signals (32 mono channels). Each signal is for-
warded to a digital-to-analog converter which converts the signal from an internal digital format to
analog. The converter forwards the signal to a balanced line driver, which feeds the to a I/O connec-
tor for distribution.
At the same time, each output channel in digital format is sent to the monitor
card. Analog signals are not sent to the monitor card; only digital signals prior to the analog conver-
sion. The digital signal is 48
kHz, AES formatted.
Figure 1-22 shows the signal flow for an analog output card.
Figure 1-22. Analog Output Card Block Diagram
Quad Mix
The Quad Mix output card (EM0511) is designed to receive inputs from the crosspoint card and
distribute outgoing signals as both AES unbalanced signals and analog signals. The Quad Mix card
can be installed in any output card slot in place of any other output card.
Cable
Driver
Coaxial
Connector
(up to 4)
2 AES Ref outputs
2 MADI outputs
One
Crosspoint
Card
(Slot determines
signals forwarded
to output card)
Reformatter
Output Card
Note The analog audio output card is designed to function in a voltage-matched system
driving high impedance loads. The output drivers are not designed to drive 600
Ω
loads continuously and may overheat if used in a 600 Ω environment.
Balanced
Line
Driver
Coaxial
Connector
(up to 4)
Monitor
One
Crosspoint
Card
(Slot determines
signals
forwarded
to output card)
Output Card
32 x 1
Mux
(4)
Digital to
Analog
Converter