Studio Technologies 5154 - Manual (Page 8)

Issue 3, September 2013 Model 5154 User Guide
Page 8 Studio Technologies, Inc.
Model 5154
Video Generator/Audio De-Embedder Module
SDI output(s) “on-air.” When an SDI signal
is removed from the module’s selected
SDI input, the Model 5154 can be config-
ured to output a few seconds of solid-gray
color before the stored image appears.
This will help to ensure that technicians or
operators will be visually “warned” that the
module’s input signal has been lost and
that the stored image will soon be tak-
ing its place. It’s hoped that the solid-gray
video image will be innocuous for on-air
viewers yet different enough to encourage
operators to switch the module’s output
away from being “on air.”
A unique feature of the Model 5154 is its
ability to automatically adapt to the format
and rate of a connected SDI signal. This
allows the stored image to be output at
the same format and rate as that used by
the associated network, local facility, or
event. If, for example, a connected input
is “1080i/59.94” then the Model 5154 will
automatically detect and store that infor-
mation. From then on whenever an SDI
input signal is not present the internal
generator will output the stored image at
“1080i/59.94.” Changing the format and
rate of the generator only requires con-
nection of an SDI signal with the desired
characteristics. (A minimum required
connection time helps to ensure that an
accidental format/rate change won’t occur.)
However, there may be situations where
maintaining the format and rate of the
internally-generated signal is important.
To support this condition one configuration
choice allows the automatic format/rate
selection function to be disabled.
Video Generation with External
Reference
Some applications may benefit from the
Model 5154 serving as a full-time stand
alone video generator. A configuration
choice helps to support such applications
by using the selected SDI input only as
a timing reference. Unlike typical opera-
tion, when selecting this operating mode a
signal connected to the selected SDI input
would not pass through to the SDI. Its rate,
format, and specific timing characteristics
would be used as a reference for the in-
ternally-generated video output. Note that
bi-level or tri-level analog timing reference
signals are not supported. Only a HD-SDI
or 3G-SDI signal can serve as a reference
signal for the Model 5154.
Audio De-Embedding
The Model 5154 allows four stereo digital
audio signals (eight audio channels) to be
de-embedded from the input SDI signal.
Eight configuration choices allow flexibil-
ity as to how the audio groups present in
the SDI source will be de-embedded and
routed to the four digital audio outputs.
A range of applications can be supported
by taking advantage of the module’s ability
to de-embed from groups 1, 2, 3, and 4.
The four digital audio outputs are unbal-
anced, 75 ohms, and follow the AES3
standard. They comply with broadcast-
standard “24-bit, 48 kHz” digital audio
signals. They follow the internal timing
of the Model 5154 and cannot be locked
to an external reference.
The Model 5154’s digital audio outputs
are directly compatible with the digital
audio inputs on several 5100-Series
modules from Studio Technologies. These
include the Model 5121 Line/IFB Output
Module and the Model 5140 Intercom
Interface Module.