AJA HDP2 - Manual (Page 6)

6
If the HDP2 scaling is set to “Auto”, the HDP2 will scale the image to best fit the screen
while preserving the aspect ratio. In some cases, a letterboxed or pillarboxed image
can be expected.
Vertical Locking
Depending on the input frame rate and the capabilities of the monitor in use, the
HDP2 will provide a vertically locked signal to the monitor. Because most DVI
monitors have their own internal scaling, the internal scaler of the monitor may or
may not lock vertically to the HDP2 output. The recommended monitor list shown
earlier lists only monitors which have been tested for proper vertical lock. The HDP2
works with many LED/LCD/DLP/Plasma monitors not shown on the recommended
monitor list—however, these monitors may have one of two types of issues
associated with not being vertically locked:
Frame add/drop: The monitor occasionally adds or drops a frame of video which
appears as discontinuous motion. For example, a moving object may appear
to briefly pause or jump ahead.
Motion tearing: The monitor displays video from 2 different fields or frames on screen.
This appears as a horizontal discontinuity in the video during motion. For
example, a moving object may appear to be split horizontally with the upper
part ahead or behind the lower part.
Frame Rates
When the HDP2 is manually configured for a particular output frame rate, the output
will run in lock-step with the video input. For best results, (without any added or
dropped frames), select an output frame rate that matches the incoming video frame
rate.
Block Diagram
HDP2 Converter, Simplified Block Diagram
DVI-D Output
SDI/HD-SDI
Input
SDI/HD-SDI
Output
Audio
Disembedder
Audio
D/A
Video Scaler
and
Framebuffer
SDI Receiver
SDI Transmitter
DVI
Transmitter
2-Channel
Analog Audio
Output
USB Port
(connect to PC or Mac)
For configuring and
updating
Processor