Cobalt Digital COMPASS 9083 HD_SD Frame Sync - Manual (Page 20)

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9083 Functional Description
1-16 9083 PRODUCT MANUAL 9083-OM (V4.5)
Dolby ® Decoding (9083-DEC only)
Note: Although the 9083-DEC Dolby ® decoder can provide Dolby ® Digital™ (AC-3)
decoding, discussion and examples here describe only Dolby ® E decoding.
When Dolby ® E or Dolby ® Digital™ is present on an embedded audio pair,
the decoder produces up to 10 decoded channels (according to the Dolby ®
sub-format received from the metadata). All resulting channels are available
as inputs to the audio router.
Dolby ® Identification and Metadata Output Processing
(See Figure 1-8.) All embedded channels are checked by the 9083-DEC for
valid Dolby
® status. When a valid Dolby ® encoded embedded pair is
detected, the channel pair carrying the Dolby ® format is displayed as “Present,
Dolby E” or “Present, Dolby Digital”, as applicable. (The decoder always
uses the metadata associated with its respective pair.) A selected encoded
channel pair can then be directed to the Dolby
® decoder. The decoder then
displays the Dolby ® bitstream format and program configuration (for
example, “Dolby E 20-bit 5.1+2” indicating 5-channel surround with LFE
channel and stereo monitor pair) for the selected pair, as defined by its
metadata.
The 9083-DEC can embed metadata on the SDI output, sourced from either
SDI input video or from the decoder as desired. Similarly, the 9083-DEC
DOLBY META output can provide RS-485 metadata for downstream devices or
systems. Metadata on the DOLBY META RS-485 output can also be sourced
from either SDI input video or from the decoder as desired.
Audio Decoding
(See Figure 1-8.) Based on the channels carrying the Dolby ® encoded pair and
the format defined within, the Dolby ® decoder provides up to 10 decoded
audio channels ( Dolby Ch 1 thru Dolby Ch 8 ; Dolby Mix 1 , Dolby Mix 2 ). Each
channel can be routed just as any other audio channel described in this
section.
Figure 1-8 Dolby ® Decoding and Metadata Output Processing
SDI IN
De-embed
SMPTE 2020
De-mux
Discrete
AES IN Pair
Dolby ® Encoded Channel/
Format/Program
Identification (User
Interface Display)
SDI OUT
DOLBY
META
SMPTE 2020
Mux
Dolby ®
Decode
Dolby ® Encoded Embedded
Pair (1+2)...(15+16)
Dolby ® Encoded AES
Pair (1)...(8)
Ch 1
Mix 2
Dolby ®
Decoded
Audio
Channels (Ch 1...Mix 2)
2X2 Mux
Input Select
Input Video
Metadata
Decoder
Metadata