Cobalt Digital COMPASS 9341 8-channel Analog Audio to AES Converter - Manual (Page 10)

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9341 Functional Description
1-6 9341 PRODUCT MANUAL 9341-OM (V4.1)
Audio Timing Function
Audio data blocks are sequentially buffered and released per the user-selected
timing reference source.
The 9341 allows selection from the following reference timing sources:
• DARS Input – All outputs can be slaved to a DARS reference when
DARS is selected. In this manner, all other inputs will be re-sampled
to sync with the DARS channel.
• Reference 1 and Reference 2 Frame References – Timing is
derived from an external frame sync reference signals distributed
with the card frame (
Ext. Frame Ref IN in Figure 1-1), thereby
allowing the audio to be synchronized to a black burst or tri-level
video reference.
• Local – Timing is derived from the card’s internal clock with no
association to external signal timing.
Audio Routing Description
The audio processor operates as an internal audio router. The router function
chooses from the following inputs:
• 8 channels of balanced analog audio inputs
• Four independent internal tone generators (described below)
• Downmix and mono mixers
• Digital silence (mute) setting
The router function in turn provides 8 channels of discrete AES output on
four AES pairs.
The router acts as a full audio cross point. Each of the 8 AES output channels
can receive signal from any one of the card input sources. Unused output
channels can be mapped to a “Silence” source. Each output also provides gain
adjustment and selectable polarity inversion.
Output audio rates are always 48 kHz locked to the selected reference. Output
AES is always precisely synchronized with the selected reference.
As set with the default settings, the routing between analog input channels
and AES output channels is basic 1-to-1 (
AN-AUD Ch 1 input is routed to
AES Ch 1 output, and so on). Other sources and/or destinations for each
channel are selected (from the choices listed above) using the card edge
controls or a remote control system.