MUTEC iClock - Manual (Page 19)

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Manual SDs-01 D 3.2.2003 17:45 Uhr Seite 16
19
Locking the internal Video
Reference Generator – 2
When running the internal video
reference generator in EXTERNAL mode, the
external reference signal may not deviate
more than ±30 ppm from its nominal clock
frequency! Do not try to lock the video
generator to pull up/down clock rates - its
video signal would be destroyed!
!
DIST does not provide redundancy for the
video outputs. If the external video reference
source fails, the video outputs will fail, too!
Locking the internal Video
Reference Generator – 3
When externally synchronizing the
video reference generator, the lock
and varispeed ranges of the synthe-
sizer will be reduced to ± 30 ppm! Thus,
enabling the pull-up/down and varispeed
factors is not provided in this mode. If,
however, these settings are made, the video
generator will automatically enable internal
synchronization.
When locking the synthesizer to the
internal video reference generator or when
locking the video reference generator to
an external applied reference source, a
synchronization time of approx. 30 seconds
for attuning all components of the video
output signal is required.
During this process the system re-locks
temporarily (the HOLD LED and the blue
LOCKED REF 1 LED are lightening alternately).
This has no relevance for system security.
The output clocks are constantly available.
!
This function also ensures a redundant (failsafe) availability of the video
output signals. If the external source fails temporarily or permanently, the
video generator will continue generating its output signals based on the
last recognized clock rate. If the external source returns to operation, any
differences to the previous rate will gradually be corrected to maintain
flawless on-air operation in e.g. broadcasting environments.
DIST (setting)
DISTRIBUTION This setting allows for forwarding the input video signal
to the video outputs using a hardware bypass. The signal is refreshed by
the video generator output amplifier to ensure a suitable output level; no
other modifications are made to the signal. If the DIST setting has been
selected for REF, the FORMAT and VIDEO TYPE functions cannot be selected
anymore. This is because the video output format is determined by the
input video reference signal.
In this mode, the synthesizer synchronizes to the input video signal to pro-
vide the output of phase locked audio clock signals.
FORMAT (function)
FORMAT This function allows for selecting the video format generated and
output by the video generator. The factory default is PAL.
PAL (setting)
PAL With this setting, the video generator produces a PAL-B/G standard de-
finition (SD) video signal compliant with the PAL/CCIR video standard (25 fps,
625 lines, 15,625.0 Hz line frequency). Depending on the REF and VIDEO
TYPE settings, this signal can be output as Black + Burst or composite video
sync. Even when a HD tri-level source is choosed as reference (HD-P-1 / 2), the
PAL setting is possible. Thus the internal video reference generator directly
converts incoming HD references with frame rates of 24Hz, 25Hz, 30Hz, 50Hz
or 60Hz into PAL SD video using its unique cross-locking functionality.
NTSC (setting)
NTSC With this setting, the video generator produces an NTSC standard
definition (SD) video signal (29.97 fps, 525 lines, 15,734.25 Hz line frequency).
Depending on the REF and VIDEO TYPE setting, this signal can be output as
Black + Burst or composite video sync.
Even when a HD tri-level source is choosed as reference (HD-N-1 / 2), the
NTSC setting is possible. Thus the internal video reference generator directly
converts incoming HD references with frame rates of 23.98Hz, 29.97Hz or
59.94Hz into NTSC SD video using its unique cross-locking functionality.
Refer to the »Synchronizable HD tri-level Standards and Frame Rates« section
in the APPENDIX for a list of all convertable HD standards and frame rates.
VIDEO TYPE (function)
VIDEO TYPE This function allows for outputting the previously selected
video format as Black + Burst or composite video sync signal. In addition,
when selecting composite video sync, one of two different output levels
can be set (see below). The factory default is BLACK + BURST.
BLACK + BURST (setting)
BLACK + BURST With this setting, the signal of the previously selected
format will be output as Black + Burst signal. Refer to the »Technical Data«
section in the APPENDIX.
COMPOSITE SYNC 0.3V (setting)
COMPOSITE 0.3V With this setting, the previously selected video format is
output as composite video sync signal with a negative sync signal level of
300 mV (0.3 V).
COMPOSITE SYNC 2.0V (setting)
COMPOSITE 2.0V With this setting, the previously selected video format is out-
put as composite video sync signal with a negative sync signal level of 2.0 V.