Grass Valley ADX-1881 - Manual

ADX-1881 HD/SD 8 AES Disembedder
Guide to Installation and Operation
M683-9900-100
July 2005
ADX-1881 Page 1 of 12
ADX-1881
Description
The ADX-1881 is a high-quality AES de-embedder
designed to extract eight (8) 24-bit 48 kHz digital audio
signals, Ancillary time code (ATC), longitudinal time code
(LTC) and ancillary data from a single SMPTE 292M HD-
SDI or SMPTE-259M-C SD-SDI signal. The ADX-1881will
output audio silence with a loss of the input signal. A delay
of up to 6 fields can be added to the audio. The ADX-1881
has a built-in audio test tone signal. The ADX-1881 provides
automatic input format detection as well as automatic
equalization. A serial data signal (RS-422) output is
available to provide Dolby E metadata output or simply to
output a serial RS422 signal. Two GPI outputs will recreate
the GPI activated by the AMX card. By combining AMX and
ADX cards at each end a full duplex link may be
established.
.
The ADX-1881 is designed for the DENSITÉ frame.
Video - Features
•
Serial HD/SD-SDI input with automatic equalization for
up to 110m/250m of cable
•
Automatic detection of video input format
•
Two pass-through HD/SD-SDI video outputs
Audio - Features
•
8 AES outputs: either 110
Ω
balanced or 75
Ω
unbalanced, depending on rear panel in use
•
Selectable audio delay of up to 3 frames in ½ frame
steps
•
24-bit digital audio disembedding
•
Audio silence output on loss of video input
•
Left/Right channels swappable for each AES output
•
Selectable routing of audio groups to AES outputs
•
Co-phased audio outputs
•
Dolby-E compatible
•
Monitor selector for Densité frame monitoring switch
bridge (MSB) and analog, stereo audio output
•
Analog monitor output muting for non-linear PCM AES
signals
Disembedding Other Signals - Features
•
Linear Time Code (LTC) output translated from
Ancillary Time Code (ATC) data or Digital Vertical
Interval Time Code (DVITC)
•
RS-422 serial data output signal reconstructed from
ANC data inserted by the embedder (including Dolby
metadata)
•
Two opto-isolated GPI data output signals
reconstructed from ANC data inserted by the embedder
FUNCTIONAL BLOCK DIAGRAM
SPECIFICATIONS
VIDEO INPUT
Video Signal:
HD/SD-SDI
SMPTE 292M/SMPTE 259M
(see list of supported formats below)
Embedded audio as per SMPTE
299M/SMPTE 272M
Embedded ATC/DVITC as per
SMPTE RP 188/SMPTE 266M
Embedded RS-422 & GPI as per
SMPTE 291M (with proprietary DID)
Cable Length: up to 110m/250m of Belden 1694A
Return Loss: >15 dB, 5 MHz to 1.5 GHz/270MHz
AUDIO AES-3id OUTPUT
Signal:
AES-3id (SMPTE 276M)
Level: 1.0 Vp-p ±10%
Impedance: 75
Ω
unbalanced
……(continued)