
Audio Modes
Page G-4
Instruction Manual: evolution 5000 E5710 and E5720 Encoder
ST.TM.E10074.1
G.3
Embedded Audio on the SDI
Figure G.3 shows the audio signal flow on the Base Board. While six audio
stereo pairs are available, only two stereo pairs can be processed by the
Base Board at any one time.
Audio can be embedded on a SDI video feed. The specified groups are:
1, 2, 3, 4. Each group contains two stereo pairs, hence each SDI can carry
a maximum of 2 x 4 = 8 stereo pairs, or 16 mono channels.
Each group has an associated Data Identifier (DID). The standard DIDs,
generated by an Encoder rack, are typically:
·
Group 1 = 0x2FF
·
Group 2 = 0x1FD
·
Group 3 = 0x1FB
·
Group 4 = 0x2F9
Other DIDs are possible. Refer to the SMPTE 272M specification for more
details. DID 1F4 is reserved for EDH error packets.
G.4
Detail of Encoder Operation
The Encoder can de-embed any two DID s at any one time, thus giving a
total of four embedded audio sources: embedded audio 1-4.
The default DID for embedded audio 1-2 is 2FFh (Group 1).
The default DID for embedded audio 3-4 is 1FDh (Group 2).
The DIDs are located in ancillary packets in the data stream.
NOTE…
Default DIDs are selected when a DID value
³
1024 is set.
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