Audio Modes
Page F-6
Reference Guide: evolution 5000 E5780 and E5782 Encoder
ST.RE.E10135.4
When a digital audio source is used, consideration must be given to the choice of clock source
used by the Encoder. To ensure correct operation the Encoder and the audio may need to be
genlocked.
shows the clock source that is appropriate for a given audio coding
mode. The two main clock sources are internal and external (derived from the H SYNC input).
Figure F.1: Digital Audio Modes
F.4
Detail of Encoder Operation
F.4.1
HD SDI Embedded Audio
The Encoder has the capability of de-embedding up to 4 groups of audio data from 4 different
Data Identifier (DID) in the HD-SDI video input. Each group contains two stereo pairs.
•
Up to 4 sets of pre-encoded Dolby Digital bitstreams or linear PCM as controlled as
Advanced Audio 4A – 4D.
The standard DIDs that are used for the extraction are:
•
Group 1 = 0x2E7
•
Group 2 = 0x1E6
•
Group 3 = 0x1E5
•
Group 4 = 0x2E4
Other DIDs can be selected and valid values are described in the SMPTE 299 specification.
*
EITHER
(preferred method for stability)
The entire system must be genlocked to studio reference black and
burst. That is, set Encoder clock source
AND
the upstream audio
coding equipment to HSYNC.
OR
Set the E57xx Encoder clock set to “Video”. The upstream audio
equipment
MUST
also be locked to video.
Lock Dolby Digital Encoder to AES/EBU reference from Encoder.
Independent of Encoder clock source.
Independent of Encoder clock source.
Digital Audio
Embedded
(SDI)
Pre-encoded
(Pass-thru)
Dolby E
DTS
MUSICAM
Dolby Digital
Dolby Digital
Linear PCM
Internal Coding
Audio Port
AES/EBU
Pre-encoded
(Pass-thru)
Dolby E
DTS
Dolby Digital
Linear PCM
Linear PCM
(Direct)
Internal Coding
o
*
MUSICAM
Dolby Digital
*
*
Linear PCM
(via SRC) – SD
*
*
Linear PCM
(Direct)
Linear PCM
(via SRC) – SD Only
*
Содержание E5780
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