Introduction – Cobalt Digital FUSION 3G 9931-EMDE 3G_HD_SD-SDI Embedder_De-Embedder User Manual
Page 21
9931-EMDE-OM (V1.15)
9931-EMDE PRODUCT MANUAL
1-17
Introduction
9931-EMDE Functional Description
As shown in Figure 1-5, the internal bus receives inputs directly from card
external sources or Dolby
®
decoder outputs as listed below.
•
Emb Ch 1-16
•
AES Ch 1-16
•
Analog audio Ch 1 - 8
•
Dolby
®
decode Ch 1-10
•
Silence
Automatic Audio Failover.
Automatic audio failover
(option
+AFO
) allows monitoring each of the card’s internal bus channels for a
user-configurable signal level threshold. If this threshold is not achieved
within a configurable holdoff time, the failover function allows an alternate
(“secondary”) channel to substitute for the primary channel.
Audio Output Routing Function
(See Figure 1-5.) The output routing function provides routing to card
outputs. This function can also direct internal bus signals to further mixing
capabilities or advanced Audio DSP functions. This function also provides
gain and mute controls for each signal.
Audio DSP functions include 5.1-channel and stereo loudness processing, and
upmixing.
Audio DSP Functions Overview.
The Audio DSP block provides the
function complement (selected via user controls) listed below. Because this
block is entirely software-based, it can provide the Audio DSP combinations
listed below (depending on ordered options).
•
5.1-Ch Loudness Processor + Dual Stereo Loudness Processors
•
Dual 5.1-Ch Loudness Processors
•
5.1-Ch Loudness Processor + Upmixer
•
Dual Stereo Loudness Processors + Dual Stereo Loudness Processors
•
Dual Stereo Loudness Processors + Upmixer
•
Dual Upmixers
2.0-to-5.1 Upmixer.
The
2.0-to-5.1
upmixer
function
receives a normal PCM stereo pair from any internal bus channel pair. The
stereo pair is upmixed to provide 5.1 channels (Left (
L
), Right (
R
), Center (
C
),
Low Frequency Effects (
LFE
), Left Surround (
Ls
), and Right Surround (
Rs
)).
Whenever the upmixer is active, it overwrites the six selected 5.1 output
channels with the new 5.1 upmix signals (including replacing the original
source stereo
L
and
R
inputs with new
L
and
R
signals).