Audio Modes
Reference Guide: EN8000 MPEG-4 PArt 10 (H.264/AVC) Encoders
Page E-7
ST.RE.E10233.1
E.3.2 Digital
Audio
On the encoder there are two input channels of audio available.
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 to the studio source.
shows the coding methods that may be used with
the digital audio inputs.
and
show the coding methods that may be used with the digital audio
inputs.
Table E.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 E.2: Codecs with Audio ln 2: Pre-encoded audio input
Connection Module
Coder
Audio In 2
Advanced
Dolby Digital passthru
Audio In
Standard
Dolby Digital passthru
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.
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.