GUIDE TO INSTALLATION AND OPERATION
16
| AMX-1901
•
LTC input (on the rear panel)
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DVITC (SD) embedded in the SDI input on the same line that has been selected in this panel for embedding
•
ATC-LTC (3G/HD) embedded in the SDI input
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ATC-VITC (3G/HD) embedded in the SDI input
The
Timecode Embedding
section provides resources to configure the embedding process.
Delay:
Adjust the timecode value to compensate for a 1-to-50 frame offset between the video and the LTC.
Value: [0, 1, 2, …, 50 frames]
SD Insertion Line:
Select the line in which to embed LTC in the SD-SDI output signal. Available only when SD is
detected at the input.
[Range is 10-20 for 525; 7-22 for 625]
SD Duplicate:
Embed a duplicate LTC in the SD-SDI output signal on the “SD Insertion Line” + 2. Available only when
SD is detected.
GPI Status:
The icons show the status of the two GPI inputs on the rear panel.
GPI Embedding:
Set up the embedding of GPI data in the output data streams. For each of the two GPIs:
Mode:
Use the pulldown list to select the operating mode for this GPI:
•
OFF – the GPI state is not embedded
•
Embed – the data placed on the rear-panel GPI port is embedded to a pre-defined user bit within timecode in
the outgoing data stream.
When Embed is selected, use the Bit pulldown list to set which of the user bits (1-16) will be used to carry
the GPI data. The default is: GPI 1 on bit 1; GPI 2 on bit 2. If the same bit is selected for both GPIs, GPI 1 is
embedded.
5.3.2 AFD tab
The Active Format Descriptor (AFD) flag is used to identify
the aspect ratio and protected areas of a video signal. The
AMX-1901 manages the transfer of the AFD flag between its
input and output, but does not use the AFD flag to perform
any picture manipulation. The AFD flag is implemented
differently in HD and SD:
•
In HD, the AFD flag (SMPTE 2016) is sent as an ancillary
packet, normally found on line 11 in the vertical ancillary
space.
•
In SD, the AFD flag is sent as a Video Line Index (VLI)
signal (RP 186), as an AFD packet (SMPTE 2016), and, for
625 only, as a Wide Screen Signaling (WSS) signal (ITU-R
BT.1119-2).
Note: The term AFD is used to represent all three types of
flags – SMPTE 2016 ancillary packet, VLI, and WSS.
The two graphics at the top of the panel show representations
of the input and output AFDs and indicate the status (e.g.
detected, inserted) and the AFD code. If no AFD is present,
the “screen” will be gray. See
57 for information about AFD flags and terminology.
Figure 5.5 Metadata - AFD tab
