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Embedded audio on the sdi, Detail of encoder operation, G.3 embedded audio on the sdi – TANDBERG E5714 User Manual

Page 300: G.4 detail of encoder operation

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Audio Modes

Page G-4

Instruction Manual: evolution 5000 E57xx DSNG and DENG Voyager Encoder

ST.TM.E10076.3

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 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

³1024 is set.

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