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Audio Word Size and Sample Rate
The Image Server employs 24-bit audio A/D and D/A converters, and records audio into a 24-
bit frame, regardless of the word size received. The sample rate is fixed at 48K. When using
the AES/EBU digital input, the 48K sample rate of the incoming digital audio must be derived
from the video genlock reference. If it is not, or if a different sample rate is used, the Image
Server's input sample rate converters must be selected.
Encoded audio streams such as Dolby E® must be referenced to the video genlock, and the
input sample rate converters must be disabled when recording such streams.
Analog/Digital Audio Selection
The following drawing illustrates jumper positions to select between analog or digital audio.
Note that each output may be individually selected. As described earlier, when analog audio is
selected, only two channels are available, while selection of AES/EBU digital audio provides
two stereo pairs, one on each XLR connector. Both jumpers for each channel (Left & Right, or
Main & Aux) must be set together, either analog or digital. The Image Server must be power
cycled for jumper changes to take effect. For more detail, see Analog/Digital Audio Selection
in the Maintenance chapter.
GAIN ADJUST
Figure 1: Jumper location on audio card for selection of analog or digital audio.
Serial Control Ports
Each of the Image Server's three 9-pin "D" connectors permits independent control of any of
the three video channels. They can accept serial commands in VDCP, Sony BVW or Odetics
protocol. The multiple serial ports allow simultaneous connection of an automation controller
and a desktop controller. See the chapter on Automation Control for further details.
Most broadcast automation systems, and some remote control panels, employ the VDCP
protocol. A list of supported VDCP commands will be found in Appendix B.
Many controllers used for transport, instant replay, and edit control employ Sony BVW or
Odetics protocol.
Page 24
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JUMPER BLOCK PAIR SHOWN
IN DIGITAL POSITION
JUMPER BLOCK PAIR SHOWN
IN ANALOG POSITION
Image Server 2000 Owner's Manual
DIGITAL
ANALOG
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