Audio Modes
Page F-4
Reference Guide: E57xx DSNG and DENG Voyager Encoder
ST.RE.E10076.3
Figure F.2: Digital Audio Modes
F.3
Embedded Audio on the SDI
Figure F.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.
Digital Audio
Embedded
(SDI)
Pre-encoded
Dolby E
DTS
MUSICAM
Dolby (AC-3)
1
Entire system must be genlocked to studio reference black and burst.
2
Set Encoder clock source to HSYNC.
3
Feed Dolby (AC-3) coder from genlocked output of the audio A/D.
Lock Dolby (AC-3) Encoder to AES/EBU reference from Encoder. Independent of Encoder
clock
Independent of Encoder clock source
Dolby (AC-3)
Linear PCM
Linear PCM
Internal Coding
Audio Port
AES/EBU
Pre-encoded
Dolby E
DTS
Dolby (AC-3)
Linear PCM
Linear PCM
Internal Coding
or
*
*
*
MUSICAM
Dolby (AC-3)
*
*
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