Grass Valley VM 3000 System Controllers v.7.4 - Manual (Page 411)

Configurator Path Finding
5−201 VM 3000 Installation and Operating Manual
PATH FINDING BETWEEN ANALOG AND DIGITAL EQUIPMENT
Automatic Conversion of Separate Analog Signals to Combined Digital Signals
The pathfinding table can be used with customer−supplied ADCs and DACs to provide automatic conversion between analog
equipment and digital equipment (such as VTRs). See Figure 5−174.
ANALOG
EQUIPMENT
ANALOG
ROUTER
DIGITAL
ROUTER
A TO D
CONVERTER
D TO A
CONVERTER
DIGITAL
EQUIPMENT
DIGITAL ENVIRONMENT ANALOG ENVIRONMENT
L
R
L
R
Figure 5−174.
For example, this technique can be used for conversion of analog audio signals, which are carried on two levels of an analog
routing switcher, to a single digital audio (AES) signal. The same concept can be applied in an embedded audio environment,
where a single digital video stream can be split into an analog video signal and up to four analog audio signals.
It is possible to arrange a system so that the conversion will take place whenever the operator selects a particular source and
switches it to a particular destination. For example, in the system shown in Figure 5−175, whenever the operator selects VTR1
as the source for VTR2, the analog audio signals will always pass through an A to D converter; when VTR2 is the source for
VTR1, the digital signal will pass through a D to A converter.