Cobalt Digital COMPASS 9081 HD_SD Frame Sync - Manual (Page 16)

1
9081 Functional Description
1-12 9081 PRODUCT MANUAL 9081-OM (V4.6)
Dolby ® Decoding (+DEC only)
Note: Although the 9081 with the 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 1-5.) All embedded channels are checked by the 9081 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.
Metadata can be embedded on the SDI output, sourced from either SDI input
video or from the decoder as desired. Similarly, the
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 1-5.) 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 1-5 Dolby
®
Decoding and Metadata Output Processing
SDI IN
De-embed
SMPTE 2020
De-mux
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)
1
Mix 2
Dolby ®
Decoded
Audio
Channels (1...Mix 2)
2X2 Mux
Input
Select
Input Video
Metadata
Decoder
Metadata