Junger Audio C8612 - Dolby® D/D+/AAC encoder - Manual (Page 9)

digital audio
modular
processing system
C8000
Dolby Digital / Digtal plus / Pulse (AAC) encoder
C8612
9/20
or multiplexed into one stream
(AKA single PID mode).
A major application for associated services is called Audio Description (associated service
"Hearing Impaired").
For many years the BBC uses a technology called Warble Tone. This employs a second audio pair
for recording of AD content. One track contains the narrators voice while the other track contains a
control signal that is encoded from mix and pan information. This was originally used to perform a so
called broadcast mix prior to transmission. The AD mix (program mixed with narrator) was then
transmitted parallel to the main audio. Dolby encoding technology paired with Dolby consumer
decoder implementation now allows for transmitting the narrators voice only and do a so called
receiver mix. This saves a lot of bandwidth for transmission. Mixing information are now transmitted
via metadata. The C8612 can translate the Warble Ton track into mixing metadata. This solution
allows to broadcast existing AD enabled content from stock :
D) Transcoding
a D-D encoded stream may be transcoded directly to a
D-D plus stream. The metadata may be modified for the output
stream.
Encoder 1 – 5.1
acmod: 3/2L … 1/0
L / R
DOLBY® CAT561 OEM Board (Firmware 2.4.0.3 and higher)
ENCODER CONFIGURATION two associated encoders – warbletone control – single stream (PID)
Encoder 2 – 2/0
acmod: 2/0 or 1/0
Warbleton decoder
C / LFE
Ls / Rs
Warbletone
Program 1
Program 2
D-D plus
mixing enable
Stream Multiplexer
Metadata Multiplexer
Consumer Metadata
Metadata Multiplexer
Consumer & Mixing Metadata
Substream ID=0
Substream ID=1
Encoder 1 – 5.1
acmod: 3/2L … 1/0
L / R
DOLBY® CAT561 OEM Board (Firmware 2.4.0.3 and higher)
ENCODER CONFIGURATION two associated encoders – single stream (PID)
Encoder 2 – 2/0
acmod: 2/0 or 1/0
C / LFE
Ls / Rs
2L / 2R
Program 1
Program 2
D-D plus
mixing enable
Stream Multiplexer
Metadata Multiplexer
Consumer Metadata
Metadata Multiplexer
Consumer & Mixing Metadata
Substream ID=0
Substream ID=1
Encoder 1 – 5.1
acmod: 3/2L … 1/0
L / R
DOLBY® CAT561 OEM Board (Firmware 2.4.0.3 and higher)
ENCODER CONFIGURATION two associated encoders – warbletone control – single stream (PID)
Encoder 2 – 2/0
acmod: 2/0 or 1/0
Warbleton decoder
C / LFE
Ls / Rs
Warbletone
Program 1
Program 2
D-D plus
mixing enable
Stream Multiplexer
Metadata Multiplexer
Consumer Metadata
Metadata Multiplexer
Consumer & Mixing Metadata
Substream ID=0
Substream ID=1