Cobalt Digital COMPASS 9305 Embedded Audio Delay Processor - Manual (Page 9)

9305-OM (V4.1) 9305 PRODUCT MANUAL 1-5
Introduction
9305 Functional Description
9305 Functional Description
Figure 1-1 shows a functional block diagram of the 9305. The 9305
HD/SD-SDI Embedded Audio Delay provides independent delay settings
from 2.00 msec to 10500.00 msec (10.5 seconds) for up to 16 embedded
audio channels. The output timing can be locked to that in the input video, or
an external black burst/tri-level video reference signal.
In addition to the delay function, the 9305 also provides audio routing that
acts as a full audio cross point. Each of the 16 embedded audio output
channels can receive signal from any one of the 16 embedded input channels,
four internal tone generators, or several mixer outputs. Unused output
channels can be mapped to a “Silence” source. Each output also provides gain
adjustment and selectable polarity inversion.
9305 Input/Outputs
The 9305 provides the following video inputs and outputs:
• Inputs:
• HD/SD SDI IN – dual-rate HD/SD-SDI input
• Outputs:
• SDI OUT – four dual-rate HD/SD-SDI post-processed buffered
video outputs
• RCK OUT – four reclocked HD/SD-SDI pre-processed buffered
input copies
Audio Delay and Timing Function
Delay controls for each embedded channel provide independently adjustable
delay ranging from 2.00 msec to 10500.00 msec (10.5 seconds). Audio data
blocks are sequentially held in independent buffers and released per the delay
setting at the intervals dictated by the delay setting and the user-selected
timing reference source.
The 9305 allows selection from the following reference timing sources:
• Input Video – Timing is derived from the input video.
• Reference 1 and Reference 2 External References – Timing is
derived from an external reference signals distributed with the card
frame (
EXT REF IN (1,2) in Figure 1-1), thereby allowing the audio to
be synchronized to a black burst or tri-level video reference. Where
compatible, using an external timing reference can allow for quicker
lock acquisition.