Grass Valley AMX-1881 - Manual (Page 10)

AMX-1881 HD/SD 8 AES Embedder
Guide to Installation and Operation
Page 10 of 19 AMX-1881
Metadata
The Metadata tab offers setting options for 3 types of input
signals: LTC, RS422 and GPI.
The LTC tab allows the embedding of an LTC signal as
ATC into an HD-SDI or as DVITC into an SD-SDI signal.
A: the presence icon shows if an LTC signal is detected by
turning green.
B: the insertion can be toggled to OFF or ON, to disable
or activate the embedding of the LTC signal into the HD/SD
SDI signal.
ATC packets are inserted as follows:
• 1080i – lines 9 & 10 in field 1; line 8 in field 2
• 720p – lines 9 & 10
C: the delay option allows correction of lipsync problems
by adding up to 3 frames of delay.
D: the DVITC menu has two parameters, Insert line and
duplicate. The insert line option allows the user to choose
the position of the DVITC in the video signal, while the
duplicate option inserts a second DVITC packet on the
video line following the one chosen by the user.
The RS-422 tab allows the embedding of RS-422 serial
data as ANC data in the HS/SD SDI signal.
Mode:
OFF will leave any embedded RS-422 data untouched,
SERIAL: (HD and SD): embeds the RS-422 data in the
horizontal blanking (HANC), overwriting previously-
embedded serial data. The Baud Rate and Parity pull-
downs are activated:
• Baud Rate: supports 38.4 and 115 Kb
• Parity: none, even or odd
Note: in 525 format, to activate the Serial mode, at least
one of the four audio groups must be set to “Delete”
METADATA (HD only): embeds the RS-422 data in the
vertical interval (VANC).
• The Metadata Line pulldown becomes active, allowing
selection of the line to write the data (9-20)
• Data in the selected line is overwritten
• Data in other lines is unchanged.
The GPI tab gives access to two different functions,
selected by the Mode pulldown:
User Preset: the two GPI
inputs are used to select
User Presets 1 and 2
(see User Presets on
page 14)
Embed: allows the
embedding of sampled
GPI status data as ANC
data. Select either Pass
(leaving the already
embedded data
untouched) or Overwrite
(embedding the new GPI
data in the HD/SD-SDI
signal, overwriting the
previous data) for each of
the two GPI data sets.
Aspect Ratio
The Active Format Descriptor (AFD) conveys information
about the “protected “area inside a picture, the aspect ratio,
and the preferred presentation of the image. The AFD
consists of the Aspect Ratio of the display monitor for
which the signal is intended, and a code indicating the
nature of the protected area and preferred display.
A
B
C
D