Studio Technologies 5152 V.2 - Manual (Page 26)

Issue 4, September 2013 Model 5152 User Guide
Page 26 Studio Technologies, Inc.
Model 5152
Video Generator/Audio Embedder Module
present on the group or groups selected
to be embedded by the Model 5152 will
be replaced.
A subtle but potentially important topic
must be covered. With the Model 5152’s
embedding flexibility it’s possible that
equipment connected to the SDI output(s)
could exhibit less-than-desirable perfor-
mance. Embedded audio data will only be
present on the Model 5152’s SDI output(s)
according to the configuration setting.
There is no requirement that a specific
group, such as group 1, be active. In the
case where no valid SDI source is con-
nected to the selected SDI input, the SDI
output signal will consist of the custom
“720” or “1080” image along with the em-
bedded audio. As such, ancillary data
created by the embedding process will
only be present for the specific configured
audio group or groups. For example, if the
Model 5152 has been configured for digital
audio inputs 1 and 2 to be embedded into
SDI group 3, then there will be no ancil-
lary data packets present in the SDI output
for groups 1, 2, and 4. Only if a connected
SDI signal has embedded audio on those
groups (1, 2, and 4) will they be present in
the Model 5152’s SDI output(s). This can
be significant as it’s been discovered that
some equipment that receives SDI signals
expects that embedded audio will be pres-
ent, at a minimum, on group 1. So embed-
ding audio, as an example, that is only
present on group 3 could cause an issue.
GPI and GPO
Model 5152 module with serial numbers
of 00251 and later include a GPI (general-
purpose input) and a GPO (general-
purpose output) function. Depending on
the application, connections may have
been made to the GPI and the GPO. The
GPI function allows on/off control of the
Model 5152’s audio embedder function.
(This would require that the GPI has been
connected to an external switch or con-
tact closure and the function configured to
be enabled.) When the GPI is open (not
shorted; logic “high”) the specific action of
the embedder function would be controlled
by the embedding configuration param-
eter. When the GPI is shorted to common
(pulled “low”) the embedding configuration
is temporarily ignored and the embedder
function is disabled. Any embedded audio
present on the SDI input source will pass
through to the Model 5152’s SDI output(s).
The GPO may be connected to an LED
indicator. A configuration choice allows the
GPO to be active “high” or active “low” in
response to a SDI signal connected to the
selected SDI input. If configured for active
high an associated LED would light when-
ever a valid SDI source is connected to the
selected SDI input. If configured for active
low the LED would light whenever a valid
SDI is not connected to the selected SDI
input.
Technical Notes
Bitmap Image File
Requirements
The Model 5152 allows two bitmap (.bmp)
images to be stored and output when an
SDI input signal is not present. One image
has a pixel size of 1280 x 720 while the
other has a pixel size of 1920 x 1080. To
be stored with the Model 5152 the files
must be FAT32-compatible and have
names of img720.bmp and img1080.bmp,
respectively.