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Passing Embedded Non-PCM Audio through the Frame Sync
As described above, non-PCM embedded audio sources such as Dolby E or Dolby Digital will
automatically bypass the audio synchronization feature. When the video frame synchronizer
is active, this can cause misalignment of the video-to-audio timing. To resolve this problem,
the non-PCM audio sources should pass through the video frame synchronizer—which will
automatically add an equal amount of audio delay and video delay. This can be
accomplished by simply disabling the audio embedder at the output stage for the
associated audio pair. The following conditions apply:
The ADS Clean feature must be disabled.
The processing channel output set to Proc Bypass.
Remapping of the embedded audio to different output pairs is not supported.
Example
Dolby E is present in input processing channel 1, embedded audio channels 2A and 2B (or,
Group 1 Pair 2). To pass this audio pair through the system while maintaining
synchronization with video, set the EMB 1 Grp 1 Pair 2 parameter (Audio Embedding >
Embedding 1 > Control) to Disable. This will leave the original embedded audio in this
pair intact and not overwritten. Set the EMB 1 ADS Clean parameter to No. Set the Proc
Ch 1 Out Format (Video Output and Routing > Output Format) to Proc Bypass.
Audio Embedding Control
The Selenio X100 makes it possible to embed audio on a pair-by-pair basis. Each embedder
has four groups, with two pairs in each group. Using the EMB x Grp x Pair x embed
control parameters, you can embed a single pair of audio at any one time.
Audio Embedding Modes
The audio embedder component in the Selenio X100 is composed of several smaller
subcomponent blocks:
One ancillary data stripper (ADS)
Four audio embedding subcomponents
The first subcomponent is an ancillary data stripper (ADS). This block removes all ancillary
data packets in the input SDI stream, prior to embedding.
Following the ADS block are four separate audio-embedding subcomponents. Each
subcomponent has the ability to operate on only one audio group, either appending or
overwriting a predetermined group onto the SDI stream.
Table 3-9
of the embedding modes.
Table 3-9
Options
Append
briefly describes the Append, OverWrite, and Auto options available from each
Audio Embedding Error Description
Description
Attempts to insert the audio data and control packets immediately
following the last existing audio data/control packet in the horizontal
ancillary region (see
Installation and Operation Manual
Append Embedding
on page 76)
Selenio X100
75
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