Studio Technologies 5152 V.1 - Manual (Page 12)

Issue 5, September 2013 Model 5152 User Guide
Page 12 Studio Technologies, Inc.
Model 5152
Video Generator/Audio Embedder Module
A configuration setting must be appropri-
ately made to enable the optical SDI input.
There is no automatic switching between
the optical and coaxial (BNC) SDI inputs.
Only one of the two SDI inputs can be
selected and active at a time. Refer to
the Configuration section of this guide
for details.
Digital Audio Inputs
Up to four unbalanced digital audio sourc-
es can be connected to the Model 5152.
Following SMPTE standards, they will be
embedded into the externally-supplied or
internally-generated SDI signal. The four
serial digital audio sources represent eight
audio channels, two per serial digital audio
signal. The sources must comply with the
AES3 standard for unbalanced digital au-
dio signals. These have a characteristic
impedance of 75 ohms and a nominal
signal level of 1 volt peak-to-peak. This
type of signal was previously referred to
as being an AES3id digital audio signal.
The connected signals do not have to be
synchronized with each other or with the
associated SDI input and output signals.
This is because each of the Model 5152’s
digital audio input circuits has a sample-
rate-conversion (SRC) function associated
with it. Digital audio signals with a sample
rate of 32 to 48 kHz and a bit depth of
up to 24 are compatible. The nominal refer-
ence signal level of the connected digital
audio source can follow either the AES
(–20 dBFS) or EBU (–18 dBFS) standard.
This is because the embedding function
simply takes the incoming digital audio
“bits” and inserts them into the correct
data locations in the SDI signal.
An interconnecting cable assembly must
be prepared with a 9-pin male D-submin-
iature plug (DE-9M) on the end intended
for connection with the Model 5152. This
cable will interface the digital audio signal
sources with the 9-pin female “D-sub”
(DE-9F) connector located on the back
of the Model 5152. Refer to Figure 3 for
detailed connection information.
It’s expected that four independent pieces
of coaxial cable will be used to bring the
unbalanced digital audio signals into the
DE-9M plug, so using miniature coaxial ca-
ble is highly recommended! The connector
pin assignments were carefully selected
to assist in making these “hot” and “shield”
connections.
6 Input 1 (audio channels 1/2)
1 Shield 1
7 Input 2 (audio channels 3/4)
2 Shield 2
8 Input 3 (audio channels 5/6)
3 Shield 3
9 Input 4 (audio channels 7/8)
4 Shield 4
5 Not Used
Notes:
1) Connector type on Model 5152 is a 9-pin
D-subminiature female (DE-9F). Installer must
provide a 9-pin D-subminiature male (DE-9M).
Connector uses 4-40 threaded inserts for
locking with mating plug.
2) All inputs AES3 unbalanced digital audio;
75 ohm/1 Vpp (formerly AES3id).
3) Total of eight audio channels (four “stereo”
pairs).
Figure 3. Digital Audio Input Connections