Cobalt Digital FUSION 3G 9931-EMDE 3G_HD_SD-SDI Embedder_De-Embedder - Manual (Page 17)

9931-EMDE-OM (V1.15) 9931-EMDE PRODUCT MANUAL 1-13
Introduction
9931-EMDE Functional Description
Audio Subsection Description
Note: Descriptions below include some functions and features that are available
only as options.
(See Figure 1-5.) The 9931-EMDE audio processing subsection is built
around a card internal 16-channel bus. This 16-channel bus receives inputs
from an input routing crosspoint that routes de-embedded and discrete AES
signals over the 16-channel bus. Correspondingly, at the output end of the
16-channel bus is an output routing crosspoint that in turn distributes the
16-channel bus signals to embedded and discrete AES audio outputs.
An Input Audio Status display shows the presence and peak level of each
input audio channel received by the card. For digital audio inputs, payload is
identified (PCM or data such as Dolby
® Digital or E), as well as sample rate
for discrete AES inputs. Discrete AES inputs can have sample rate conversion
applied to align these inputs with the output timing (received sample rates
from 32 kHz to 96 kHz are supported).
An Audio DSP function (which interfaces with the output routing block)
provides eight tone generators and advanced functions such as loudness
processing and upmixing. The routing and Audio DSP functions are described
in detail later in this section.
As such, the audio subsection provides a full crosspoint between all supported
audio inputs and output formats.
The audio subsection allows choices from the following audio inputs:
• 16 channels of de-embedded audio from the SDI program video path
• Up to 16 channels (8 pairs) of discrete AES input
• Up to 8 channels of balanced analog audio input
• Up to 10 channels of decoded Dolby ® E or AC-3 audio
• Digital silence (mute) setting
The audio subsection allows routing to the following audio outputs:
• 16 channels of embedded audio on the SDI output
• Up to 16 channels of discrete AES output on eight AES pairs
• Up to 8 channels of balanced analog audio output
Note: Practical AES channel count handled by the card is 8 pairs, of which each
pair can be user GUI-selectable as an input or output.
All embedded and AES channels have status displays that show the following
for each channel pair:
• PCM signal presence
• Dolby E signal presence
• Dolby Digital signal presence
• Missing (no signal detected)