Discrete Aes Audio Output; Aes Audio Input Advanced Features; Aes Sample Rate Converter Bypass; Zero-Delay Audio Embedding - Cobalt Digital Inc openGear 9034 Owner's Manual

Discrete AES Audio Output

The 9034 can emit 16 channels (8 pairs) of discrete AES audio on 75 ohm BNC connections. The AES
clock rate will be precisely locked to the output video rate.

AES Audio Input Advanced Features

AES Sample Rate Converter Bypass

The card's AES inputs have built in sample rate converters that are enabled by default. This allows the
card to interface with asynchronous AES sources (sources who's AES timing does not match the video
reference timing.). They can be bypassed with a control in Dashboard or the front panel. This is a
necessity when trying to embed non-PCM AES audio such a Dolby E or Dolby Digital audio streams.
This control is off by default.

Zero-Delay Audio Embedding

Sometimes it is desirable to embed AES with minimum latency. For example, if you want to embed
Dolby E audio into video with no latency, and delay the video by one frame to account for Dolby E
encoding delay. By turning this control on for a given AES pair, the pair will be directly embedded into
it's corresponding group, bypassing the normal frame sync audio delay. (AES Pair 1 into Embedded
Group 1, ch1 & ch2, AES pair 2 into Embedded Group 2, ch3 & ch4). This control overrides the
standard audio routing system: if AES Pair 1 is selected, then the controls to route into Embedded
group 1, ch1 & ch2 don't apply. There is no gain or polarity control available when this option is
selected. This control is off by default

Low latency AES Passthrough

This control is similar to zero delay audio embedding. If selected for input pair X it causes AES output
pair X to act as a bit for bit copy of AES input pair X. This over rides the normal audio routing and
delay. No gain and polarity adjustments are possible. This control is off by default.

Documentation Terms

The following terms are used throughout this guide:
9034 Owner's Manual • • • • (V 2.0)
•
"Frame" refers to the 8310 frame that houses the 9034 card.
•
"Operator" and "User" both refer to the person who uses the 9034.
•
"Board" and "Card" all refer to the 9034 card itself, including all components and
switches.
•
"System" and "Video system" refers to the mix of interconnected production and
terminal equipment in which the 9034 operates.
Page 9 of 28