2-18
System Overview
Boards in Meridien I/O Box
The system uses different boards in the Meridien I/O box to support
video and audio (see Figure 2-4). The following sections explain the
functions of each peripheral board located in a Meridien I/O box.
Figure 2-4
Meridien I/O Box
Meridien Video I/O Board
Each system uses a video I/O board. The video I/O board has the
following features:
•
Provides a parallel digital interface between the digital media
board set and the analog I/O.
•
Digitizes one channel of composite, component (Y, R-Y, B-Y), or
S-Video.
•
Converts digital output from the digital media board set to an
analog output signal for composite (three outputs), component,
and S-Video.
•
Acts as a baseboard for the serial digital I/O (SDI) board.
•
Provides a genlock capability to allow the video to be locked to an
external source such as house sync or to a black burst generator
(BBGen).
•
Provides an audio slave clock to lock incoming audio to incoming
video.
REF
COMPOSITE
S-VIDEO
S-VIDEO
OUT 1
OUT 2
OUT
OUT
OUT 3
OUT
IN
OUT
B-Y
R-Y
B-Y
R-Y
Y
Y
COMPONENT
COMPOSITE
IN
IN
OUT 1
OUT 2
OUT 3
IN
IN / OUT
SYSTEM
LTC
SLAVE CLOCK
IN
IN
DIGITAL VIDEO
8 channel
Slave Clock
In
Video I/O board
Serial digital I/O board
Eight-channel audio interface board
