Audio Processor Description - Cobalt Digital Inc 9934-AUD-PRO-DSP Product Manual

Introduction

Audio Processor Description

De-Embed IN 1-16
Input Routing
(from Program
Video De-Embed)
AES
AES IN
Rx/SRC
Analog
AN-AUD
Audio
IN
ADC
9934-AUDPRO-OM (V1.5)
The audio processor operates as an internal audio router. This function
chooses from the following inputs:
16 channels of embedded audio from the SDI video input (default
•
1-to-1 routing to SDI output)
Up to 16 channels (8 pairs) of discrete AES input
•
Up to 4 channels of balanced analog audio input
•
(See Figure 1-4.) The audio processing subsection is built around a card
internal 16-channel audio bus. This 16-channel bus receives inputs from an
input routing crosspoint that routes de-embedded, and discrete AES and
analog audio inputs, over the 16-channel card 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 and
analog audio outputs.
An Input Audio Status display shows the presence and peak level of each
input audio channel received by the card. In addition to SDI embedded audio
channel sources, analog and coaxial AES inputs are available as input audio
choices. For AES audio inputs, payload is identified (PCM or data such as
®
Dolby Digital or E). Each AES input pair has independent sample rate
converters to align each input pair with video timing to accommodate cases
where AES audio is not synchronous with input video (SRC automatically
bypassed for non-PCM payloads). As such, the audio subsection provides a
full crosspoint between all supported audio inputs and output types.
Routing/Gain/
Internal
Mute/Invert
Bus
Controls
Audio
Meters
Figure 1-4 Basic Audio Processing Block Diagram
1. Discrete audio I/O channel count is dependent on rear I/O module used. Not all rear I/O modules
may support maximum number of available discrete channels.
9934-AUD-PRO-DSP PRODUCT MANUAL
9934-AUD-PRO-DSP Functional Description
Internal Bus Controls
Audio Dolby E
Alignment
Delay
Control
Offset
Control
Ref
1
Output Routing
Embed 1-16
(to Program Video
Embed)
Routing/Gain/
Mute/Invert
Controls
AES
Tx
Audio
Meters
Downmix
Analog
Audio
DAC
AES OUT
AN-AUD
OUT
9902AUD V1.0LB89
1-13