AJA HDP - Manual (Page 6)

6
Vertical Locking
Depending on the input frame rate and the capabilities of the monitor in use, the HDP 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
HDP output. The recommended monitor list shown below lists only monitors which have
been tested for proper vertical lock. The HDP works with many LCD and 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 HDP is either automatically, or manually configured for video standard timing,
the output frame rate is based on the following incoming frame rates:
50/59.94/60Hz
Video The HDP will generate a vertically locked output at that same frequency.
23.98/24Hz Video The HDP will frame rate convert to either 59.94 or 60Hz, respectively.
Block Diagram
HDP Converter, Simplified Block Diagram
DVI-D Output
SDI/HD-SDI
Input
SDI/HD-SDI
Output
SDI/HD-SDI
Output
Audio
Disembedder
Audio
D/A
Video Scaler
and
Framebuffer
SDI Receiver
SDI Transmitter
DVI
Transmitter
2-Channel
Analog Audio
Output