Audio Modes
Reference Guide: evolution 5000 E5780 and E5782 Encoder
Page F-5
ST.RE.E10135.4
F.3
Audio Coding Modules
The EN5900 High Definition Encoder has two physically separate audio coding modules:
•
Advanced audio encoding: this module is controlled through menus called Advanced
Audio 4A – 4D. The functionality is currently restricted to up to four services of Dolby
Digital or Dolby Digital pass-thru but more functions will be included in the future.
•
Standard audio encoding: this module includes stereo MPEG-1 Layer II and Dolby Digital
encoding functionality and is controlled using the menus called Audio A and B.
F.3.1 Digital
Audio
There are two connections available. ‘Audio In 2’ connects to the Advanced Audio modules,
while ‘Audio In’ is associated with the standard module. Audio in 2 can be used for surround
inputs.
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
and
F.2
show the coding methods that may be used
with the digital audio inputs.
Table F.1: Codecs with Audio ln 2: Linear PCM Audio Input
Connection Module
Coder
Audio In 2
Advanced Audio 4A – 4D
AAC (ADTS)
Audio In
Audio A and B
Dolby Digital
MPEG 1 Layer II
Table F.2: Codecs with Audio ln 2: Pre-encoded Audio Input
Connection Module Coder
Bitrate
Audio In 2
Advanced
Dolby Digital and Dolby Digital Plus pass-thru
384 kbit/s for 5.1.
Audio In
Standard
Dolby Digital and Dolby Digital Plus pass-thru
128 kbit/s for stereo
F.3.2
Digital Audio on AUDIO IN 2
AUDIO IN 2 connector. This input method is selected as “Digital” in the Advanced Audio
4A - 4D menus. The input format for this input is linear PCM or Dolby Digital bitstreams.
When the digital audio source is used with the
AUDIO IN 2
connector, consideration must be
given to the choice of clock source used by the Encoder. To ensure correct operation, both
the Encoder and the audio source may need to be genlocked to the studio source by selecting
the video clock as external. Then the encoding clock is derived from the signal at the H SYNC
input.
F.3.3
Digital Audio on AUDIO IN
The Encoder can receive up to 2 sets of digital audio stereo pairs on the
AUDIO IN
connector.
This input method is selected as “Digital” in the Audio A and B menus. The input format for
this input can be either per-encoded Dolby Digital bitstreams or linear PCM.
When the digital audio source is used with the
AUDIO IN
connector, consideration must be
given to the choice of clock source used by the Encoder. To ensure correct operation, both
the Encoder and the audio source may need to be genlocked to the studio source by selecting
the video clock as external. Then the encoding clock is derived from the H SYNC input.
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