Dolby, 9083 functional description, Decoding (9083-dec only) – Cobalt Digital COMPASS 9083 HD_SD Frame Sync User Manual
Page 20: Identification and metadata output processing, Audio decoding

1
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