Ensemble Designs 7405 HD Test Signal Generator - Manual (Page 2)

MODULE OVERVIEW
The 7405 module is a high definition test signal generator that provides four identical HD
serial outputs and two identical black outputs, all synchronous to one another. In remote
mode, vertical and horizontal timing of the six outputs can be adjusted relative to the
reference signal. A wide range of HD test patterns are user-selectable, in addition to
dedicated black outputs. There are independent enables in the remote control menus for
each test signal component so that Y, Cr, and Cb can be controlled separately.
The module can genlock to either a composite video (525/NTSC or 625/PAL) or a HD Tri-
level sync signal. The sync reference can be selected to come from the Avenue frame
master reference or the external reference BNC on the rear of the module.
As shown in the block diagram below, the selected reference enters a sync detector circuit
where information is extracted to determine the format and create the correct synchoniz-
ing pulses for the timing generator. The timing generator is used by the test signal
generator to synchonize the black and pattern generators. The serializers convert the
parallel data stream to a serial differential pair which then passes to the output drivers.
The output drivers feed four identical copies of the selected test signal to BNCs on the
rear of the module. Two identical copies of the black signal are also available.
Power is derived from the ± 12 volt frame power. It is regulated to the required +5 volts
for the module by on-board regulator. The module is fused with a resettable fuse device. If
the fuse opens due to an overcurrent condition, the module will lose power. After pulling
the module, the fuse will reset automatically requiring no replacement fuse.
The on-board CPU can monitor and report module ID information (slot location, software
version and board revision), and power status to the optional frame System Control
module. This information can be accessed by the user or set to register an alarm if desired
using the remote control options available. The CPU also communicates with the remote
control system.
Model 7405 HD Test Signal Generator
7405-2
HD TSG Outputs
Master
Ref
External
Ref
HD Black Outputs
Pattern
Storage
Module
controller
Avenue Control System
Sync
Detector
Timing
Gen
Pattern
Gen
Serializer
Black
Gen
Serializer
7405 HD TSG Block Diagram