Studio Technologies 5152 V.1 - Manual (Page 25)

Model 5152 User Guide Issue 5, September 2013
Studio Technologies, Inc. Page 25
Model 5152
Video Generator/Audio Embedder Module
It’s important to note that the Model 5152
does not perform a smooth transition when
switching between an external SDI source
and the internally-generated video signals.
The same holds true when the internal
color or image generator is active and then
a valid source is connected to the selected
SDI input. The SDI output does not stay
“locked” during the transition as the circuit-
ry in the Model 5152 was not designed to
that level of sophistication. This shouldn’t
cause an operational issue as the Model
5152 was not designed to be “on air”
during those transitions; the changeover
process is not seamless by design. One
can assume that up to two seconds of
interruption will occur during transitions but
typically it will be considerably shorter.
Full-Time Video Generation
A configuration selection allows the Model
5152 to act as a full-time video generator.
In this case the selected SDI input will only
be used as an external timing reference.
The front-panel SDI Input LED will light
whenever a valid signal is connected to
the selected SDI input. But the SDI input
source will only serve as a timing refer-
ence. Its video and related data (e.g., em-
bedded audio) will not pass through to the
SDI output(s). The stored video image will
always be present on the SDI output(s).
Output Format and Rate
When a valid signal is connected to the
selected SDI input it will be routed to the
SDI output at the identical format and rate
of the source. When the SDI input is no
longer present the internally-generated
signal will become active and be routed to
the SDI output. The format and rate of the
internally-generated SDI signal will depend
on parameters that are stored within the
Model 5152. Whether these parameters
can change depends on the configuration
of the module’s SDI output image format/
rate mode. Typically, the mode will be set
for Auto Select which allows the Model
5152 to revise its parameters by following
the format and rate of the connected SDI
signal. This ensures that the Model 5152
can generate an SDI signal that matches
the requirements of a facility or event.
For the module to “learn” a new format
and rate simply requires the momentary
connection of an SDI signal that has the
desired format and rate. As long as the
signal is present on the selected SDI input
for a minimum of five seconds the Model
5152 will store the “new” format and rate
parameters in nonvolatile memory. The
module will then use those parameters
whenever the internal generator is active.
The only caveat for the module to “learn” a
new format/rate combination is that it must
be a compatible combination. Refer to the
Specifications section of this guide for a
complete list.
There are some applications that will bene-
fit from the internally-generated SDI output
signal always having a specific format and
rate. In this case the SDI output image
format/rate mode can be set for Locked.
No matter what the format and rate of a
connected SDI signal, the stored param-
eters will not change. Changing the stored
parameters would require the format/rate
mode to be changed to Auto Select, an
SDI signal with the desired format and
rate be connected for a minimum of five
seconds, and then the format/rate mode
changed back to Locked.
Moving Image Overlay
The Model 5152 has the ability to overlay
a moving image on top of the stored “720”