AJA IO LA, Инструкция по установке и эксплуатации, Страница: 27 / 76

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Io LD and Io LA Installation and Operation Manual — Rear Panel
Io
LA
Connector
Descriptions
S-Video (Y/C)
S-Video input and output female 4-pin mini-DINs provide for
connection of desktop video/pro-sumer level equipment, including
camcorders, VCRs/VTRs, and monitors—to name a few. Use high
quality shielded S-Video cables when making connections. S-video
signals are converted internally to 10-bit digital.
Composite NTSC/PAL
BNC connectors support composite NTSC or PAL input and output.
Connect an NTSC or PAL composite video cable from a VTR,
Camera, or other source to the Composite In BNC. Then connect the
Composite Out BNC to a monitor, or other Composite video device.
Composite video signals are A/D (input) and D/A (output) converted
(10-bit).
YPbPr and RGB
Connect component YPbPr video cables from a VTR, Camera,
or other source to the three YPbPr input BNCs: Y/G, Pr/R, and
Pb/B. Then connect the YPbPr Out BNCs to a monitor, or other
component device. Component video signals are A/D (input)
and D/A (output) converted (10-bit). Component video signals
are generally higher quality than composite, but not as high
quality as serial digital (SDI).
A Note About RGB
—Although RGB is used less in today’s video systems, Io supports
it at both input and output. Because Io
LA
’s (and SMPTE SDI’s) native format is
YPbPr, AJA recommends the use of YPbPr whenever possible. Although
component video monitors often have RGB inputs, it’s better to use YPbPr when
the monitor supports it. The YPbPr format provides “headroom” for
“superwhite” and “superblack”—and these video levels
will be clipped when
transcoding to RGB. Also, the RGB/YPbPr transcoding involves a level
translation that results in mathematical roundoff error. Within Final Cut Pro,
RGB can be configured in the
Audio/Video Settings or Easy Setups menus.
A Note About YPbPr
—Component Video, or YPbPr, has been given several names
over time. YUV, Y/R-Y/B-Y, and YCbCr, are just some examples. Although these
various formats have some differences in levels, they are all basically the same.
Io
LA
uses the modern YPbPr terminology exclusively. It supports three different
types of YPbPr: SMPTE/EBU N10, Betacam (NTSC), and Betacam (NTSC
Japan). These three formats differ in level only and are configured in Final Cut
Pro within the
Audio/Video Settings or Easy Setups menus.
Analog Audio Output
A DB25 female connector provides attachment for a
breakout cable with 8 XLR connectors, four male and four
female, for four channels of balanced analog audio input and
output.
S-Video
Composite Ref Loop
Out
In
Out
In
Pr/R Y/G
Pb/B
Analog Audio Ch. 1-4 In/Out