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9033-SD Owner’s Manual •
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• (V 1.1) Page 9 of 26
Analog Audio
The 9033-SD supports 8 channels differential analog audio. The analog audio is encoded in such a way
as to make +24 dBu (analog) equivalent to 0 dBFS (digital). Analog audio conversion can be disabled
to reduce power consumption.
Discrete AES Audio Input
The 9033-SD can accept 16 channels (8 pairs) of discrete AES audio on 75 ohm BNC connections. The
AES must have a nominal rate of approximately 48 kHz. Sample rate conversion is employed to
account for minor clock rate differences in the AES stream and the input video stream. However, the
card does not support AES input at 32 kHz, 44.1 kHz, 96 kHz or 192 kHz rates.
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.
Low latency AES Passthrough
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. 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:
• “Frame” refers to the 8310 frame that houses the 9033-SD card.
• “Operator” and “User” both refer to the person who uses the 9033-SD.
• “Board” and “Card” all refer to the 9033-SD card itself, including all components
and switches.
• “System” and “Video system” refers to the mix of interconnected production and
terminal equipment in which the 9033-SD operates.