Studio Technologies 5152 V.1 - Manual (Page 8)

Issue 5, September 2013 Model 5152 User Guide
Page 8 Studio Technologies, Inc.
Model 5152
Video Generator/Audio Embedder Module
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 5152 is its
ability to automatically adapt to the for-
mat 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 in-
put is “1080i/59.94” then the Model 5152
will automatically detect and store that
information. 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 connection of
an SDI signal with the desired characteris-
tics. (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 auto-
matic format/rate selection function to be
disabled.
Video Generation with External
Reference
Some applications may benefit from the
Model 5152 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 operation,
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 internally-
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 5152.
Audio Embedding
The Model 5152 allows four stereo digital
audio signals to be embedded into the SDI
output signal. The eight channels of audio
will always be embedded, whether or not
an SDI source is connected to the module.
Nine configuration choices allow flexibility
as to where the digital audio inputs will be
embedded into the SDI output signal. A
range of applications can be supported by
taking advantage of the module’s ability to
embed into groups 1, 2, 3, or 4.
The four digital audio inputs are 75 ohms,
unbalanced, and follow the AES3 standard.
They are intended for use with broadcast-
standard “24-bit, 48 kHz” digital audio
signals. Advanced sample-rate-converter
circuitry ensures excellent performance with
signals that are asynchronous with each
other and the Model 5152’s internal timing.
The Model 5152’s digital audio inputs are
directly compatible with the digital audio
output provided by the Studio Technologies’
Model 5110 Mic/Line Input Module. Up to
four Model 5110 modules can be directly
connected, supporting eight mic/line inputs.
A major Model 5152 feature is its ability
to embed audio into the SDI output signal
whether or not an SDI input signal is pres-
ent. If a valid SDI signal is connected then
the Model 5152 will embed audio data into
that data stream. If an SDI signal is not
connected embedding will continue but now
will be associated with the custom image.
In this way embedded-audio transport will
always be supported.