Ross SRG-2200, Руководство пользователя

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SRG-2200 User Guide (v6.0) DashBoard Menus • 35
Alternatively, the SRG-2200 can Genlock to an NTSC, or PAL B/G video reference. In this mode, the long term
stability is defined by the external reference.
When locked to a Composite video signal, the lock will be frequency and phase related.
Genlocking to an External Video Reference
The SRG-2200 Genlock to an external video reference in the following manner. As soon as a video reference is
applied, it is evaluated, usually within 2 seconds, and, if valid, the Genlock system performs an initial “quick-lock”
to quickly achieve field and line lock. Then, a “slow-lock” is performed in order to achieve sub-carrier lock, and
ultimately Sc-H lock. Both of these lock modes are designed to “glide” the SRG-2200 video output(s) smoothly
towards the required lock point.
For situations where the reference and the SPG output are quite close to each other timing-wise, this Genlocking
process may happen quite quickly, within a few seconds or so. At other times, especially when a PAL reference is
four fields removed from the required lock point, the process to complete the full Genlock process may take as long
as 15 seconds.
Figure 6.2 Genlock to External Video Reference
Video Reference Input Signal Formats
If an external Genlock reference is present, details regarding the format of the reference are displayed under the
Video Reference Format of the Genlock tab.
The options in the field will appear as:
While the SRG-2200 is actively evaluating the external reference format, an additional option will appear in this
field. This option appears as: “
Unknown format
”.
No signal
525 NTSC59.94i
625 PAL 50i
7 7 7 7 7 7
Sync
Burst
Presence
50Hz
59.94Hz
60Hz
6Hz
23.98Hz
24Hz
5.994Hz
Reference
Loop
Input
Crash Lock/Free Run
To All Generators
F V H
Detectors