Cobalt Digital COMPASS 9033 Input Processing Analog to Digital Video - Manual (Page 17)

9033-OM (V4.0) 9033 PRODUCT MANUAL 1-13
Introduction
9033 Functional Description
Dolby ® Decoding (9033-DEC only)
Note: Although the 9033-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 1-6.) All AES channels are checked by the 9033-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 9033-DEC can embed metadata on the SDI output. Similarly, the
9033-DEC
DOLBY META output can provide RS-485 metadata for
downstream devices or systems.
Audio Decoding
(See Figure 1-6.) 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 1-6 Dolby
®
Decoding and Metadata Output Processing
Discrete
AES IN Pair
Dolby ® Encoded Channel/
Format/Program
Identification (User
Interface Display)
SDI OUT
DOLBY
META
SMPTE 2020
Mux
Dolby
®
Decode
Dolby ® Encoded AES
Pair (1)...(8)
Ch 1
Mix 2
Dolby ®
Decoded
Audio
Channels (Ch 1...Mix 2)
2X2 Mux
Input Video
Metadata
Decoder
Metadata