Studio Technologies 5152 V.1 - Manual (Page 9)

Model 5152 User Guide Issue 5, September 2013
Studio Technologies, Inc. Page 9
Model 5152
Video Generator/Audio Embedder Module
When audio is being embedded into an
externally-connected SDI signal it will re-
place any incoming embedded audio that’s
already present. However, any embedded
audio present on groups that are not being
embedded by the Model 5152 will correctly
“pass through” to the SDI output. This is
important when SDI input signals that
already include embedded audio, such as
from portable ENG-type cameras, are con-
nected. Such devices typically embed two
or four microphone audio channels into
group 1, which need to pass through the
Model 5152 without interference.
It’s important to note that when changing
from an external SDI signal to the internal
generator (or vice-versa) the SDI output,
including embedded audio, will momentari-
ly lose timing and some video and audio
“glitches” may be present. For the intended
Model 5152 applications this should
not prove to be an issue but is worth
mentioning.
GPI and GPO
Model 5152 modules with serial numbers
00251 and later offer a general-purpose
input (GPI) and a general-purpose out-
put (GPO) function. The GPI allows the
connection of a switch or contact closure
to control the on/off status of the Model
5152’s audio embedder function. Future
versions of the Model 5152’s firmware may
implement other GPI-controlled actions.
The GPO function provides an indication
of the status of the selected SDI input. It’s
intended that the GPO will be connected
to an LED indicator. A configuration choice
selects whether the GPO is active (+3.3
volts) when the selected SDI input is valid
or active when the selected SDI input is
invalid. (This can also be described as
active “high” or active “low”). This allows,
for example, a green LED to light when-
ever a valid signal is connected to the
selected SDI input, thus providing an
“input good” indication. Alternately, a red
LED could light when the selected SDI
input is not active, providing an “input fail”
indication.
Installation
Integration of the Model 5152 into a select-
ed application should prove quite simple,
only connecting SDI input and output sig-
nals, digital audio sources, as well as
DC power is required. Some applications
will also require connection to the module’s
data bus, GPI, and GPO functions. The
coaxial (BNC) input and output connec-
tions are compatible with most HD-SDI
and 3G-SDI signals. If the specific Model
5152 being installed also includes opti-
cal support one or two single-mode fiber
interconnections will be made. The fiber
connections utilize miniature LC plugs.
Up to four AES3-compliant unbalanced
digital audio signals can be connected
by way of a 9-pin D-subminiature (DE-9)
connector. Each of these four digital audio
signals supports two channels of audio.
The DC power source is nominal 12 volts
with an acceptable range of 10 to 18 volts.
It’s possible that the module will be part of
a local RS-485 data bus that’s associated
with a Studio Technologies’ Model 5190
Remote Access Module. If so, two ad-
ditional wires are required to connect the
module to the data bus. GPI and GPO con-
nections are made using a 3-pin header.
After all the connections have been com-
pleted the module can then be secured
into the designated mounting location.