Grass Valley AMX-1881 - Manual

AMX-1881 HD/SD 8 AES Embedder
Guide to Installation and Operation
M685-9900-106
November 2011
AMX-1881 Page 1 of 19
AMX-1881
Description
The AMX-1881 is a high-quality embedder which embeds
up to eight AES 24-bit 48 kHz digital audio signals into a
single HD/SD serial digital video signal. It includes audio
and video signal presence detection and reporting, and
local or remote configuration and control. A unique feature
is its ability to embed time code, a serial RS-422 data signal
and two GPI status signals into the video signal. The card
has built-in audio tone, time code and video color bar test
signals.
The AMX-1881 is designed for use in the DENSITÉ frame.
Video - Features
•
Serial HD/SD-SDI input with automatic equalization for
up to 110/250 meters of cable.
•
Automatic detection of video input format
•
Automatic detection of input video loss and switchover
to local black for continuity of embedded audio.
Audio - Features
•
AES inputs: either 110
Ω balanced or 75 Ω
unbalanced, depending on rear panel in use
•
Sample rate conversion for asynchronous AES inputs
•
Audio input channel gain selectable from -96dB to
+12dB by 0.5dB steps
•
Audio groups insertion/pass-through/delete
•
Selectable audio delay of up to 3 frames in ½ frame
steps
•
Left/Right channels swappable for each AES input
•
Automatic mute on AES error
•
Selectable routing of AES signals to audio groups
•
Dolby-E compatible (48kHz synchronous)
•
24-bit digital audio embedding
•
Monitor selector for Densité frame monitor switcher
(MSB)
Embedding Other Signals - Features
•
Linear Time Code (LTC) embedding
•
RS-422 serial data input for embedding as ANC data.
•
Sampling of two GPI inputs for embedding as ANC
data.
FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS
VIDEO INPUT
Video Signal:
HD/SD-SDI
SMPTE 292M / SMPTE 259M
(see list of supported formats below)
Cable Length: up to 110/250 meters of Belden 1694A
Return Loss: >15 dB, 5 MHz to 1.485 GHz
AUDIO AES-3id INPUT
Signal:
AES-3id (SMPTE 276M)
Level: 0.2 to 2.0 Vp-p
Impedance: 75
Ω unbalanced
Cable length: >400 m
AUDIO AES SIGNALS
Sampling Rate:
48kHz synchronous or asynchronous
Dolby-E Rate: 48kHz synchronous
Bits: 24-bit
…..(continued)
88 u ct o a oc ag a
REMOTE
CONTROL µController
REF URS4D
Data
Processor
/ Metadata
Insertion
2
3
4
1
LTC IN
AES IN
HD/SD-
SDI IN
OSC
Test
Signals
1
2
HD/SD-
SDI OUT
MSB
Selector 8x1
1 RS422
GPI
1
2
SRC
SRC
SRC
SRC
6
7
8
5 SRC
SRC
SRC
SRC
Selectable
delay and
level