AJA FS2 - Computer Video Formats; Physical Connection

FS2 v2.1r1 www.aja.com
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The FS2 offers four settings shown in the following table. The analog audio levels listed in
the table are defined in reference to 0 dBFS (where FS = full scale), which is the maximum
level that can be represented digitally. Note that the test method for these levels uses a
1kHz sine wave.
Computer Video Formats
The AJA FS2 accepts non-broadcast video input signals with the introduction of software
version 2.0. These signals, known as “computer,” “VESA,” or “DVI” formats, can be applied
to the HDMI input connector. Computer signals applied to the HDMI input must be
digital video signals compatible with single-link DVI, which covers the range of display
sizes from 640x480 (VGA) to 1920x1200 (WUXGA). For a list of accepted computer video
formats, please see "Appendix A: Specifications on page 104".
Note: T
he FS2 does not accept analog computer video inputs because HDMI connectors
do not have pins assigned for analog signals. The FS2 also does not accept dual-link DVI
inputs.
Physical Connection To connect a computer video input to the FS2 HDMI connector, use a passive DVI-to-
HDMI adapter (user supplied). To prevent strain on the FS2 HDMI connector, AJA
recommends that you convert from DVI to HDMI at the video source, such as the
computer display card, and run an HDMI cable from the source to the FS2 input. You can
Table 4. FS2 Audio Level Settings
FS2 Audio Setting Meaning
+24 dBu analog = 0 dBFS
maximum audio level
SMPTE standard (US)
With digital audio at the maximum possible
level (before clipping), the expected
analog audio input level is +24 dBu, and the output is scaled to this level.
Typically, the US Standard Operating Level is +4 dBu analog
or -20 dBFS digital. The FS2
+24 dBu setting allows 20 dB of headroom (+4 to +24 dBu) per the SMPTE RP-155
standard.
+18 dBu analog = 0 dBFS
maximum audio level
EBU standard (EU)
With digital audio at the maximum possible
level (before clipping), the expected
analog audio input level is +18 dBu, and the output is scaled to this level.
Typically, the EU Alignment Level is 0dBu analog or -18 dBFS digital. The FS2 +18 dBu
se
tting allows 18 dB of headroom (
0 to +18 dBu) per the EBU R68 standard.
+15 dBu analog = 0 dBFS
maximum audio level
German standard
With digital audio at the maximum possible
level (before clipping), the expected
analog audio input level is +15 dBu, and the output is scaled to this level.
+12 dBu analog = 0 dBFS.
maximum audio level
Consumer equipment
With digital audio at the maximum level (before clipping), the analog audio input level
is +1
2 dBu, and the output is scaled to this level. These levels are provided for
consumer equipment that outputs lower audio levels than professional equipment.
Consumer audio units are often given in dBV, with +12.2dBu equivalent to +10dBV. The
sta
ndard operating level corresponds to -10dBV (-7.8dBu). The FS2 +12dBu setting
provides approximately 20 dB of headroom (+10 to -10 dBV).
USO RESTRITO