Ross Synergy MD, Инструкция по эксплуатации, Страница: 57 / 388

Synergy Q/MD Engineering Manual (v9.1 MD) System Architecture • 2–11
mode: 148.5MHz is used for 1080i/60, 720p/60, 480i/59.94 and 576i/50; 148.352MHz is used for
1080i/59.94 and 720p/59.94. The clock generator on each board is locked to a master reference.
On the Video Input Board with Reference (Ross Part Number 4400A-060B or 4400AR-062) there is
an analog Reference input, consisting of a pair of BNCs which can be looped. This input can accept
Composite/Black Burst or Tri-Level Sync.
The reference processor includes a PLL (Phase-locked Loop) which locks the internal clock source to
the incoming video reference. This clock source is then used to generate master vertical sync and
clock reference signals which are passed on to the rest of the system. When the PLL acquires lock
with the applied reference signal, the green “Lock” indicator on the rear panel, beside the reference
BNCs will illuminate.
Lock Indicator — Input Board
It is possible for the system to run in a format which differs from the format of the incoming analog
video reference. It is, however, necessary for the analog reference format and the video format in the
switcher to be frame locked. For example, it is possible to provide a reference at 1080i/59.94, and run
the switcher at 720p/59.94 or 480i/59.94; but it would not be possible to run the video at 1080i/60.
Note The internal reference signals are bused, so that the input reference
may be sourced from any input card slot.
Note For optimal performance, it is recommended that tri-level sync be used
for HD video modes.
Note
If the analog reference signal is removed, the system will continue to
run nominally at the desired video rate, but may drift out of phase with
the original analog reference source. The system will re-lock if the
reference source is re-applied.
Note You can only use a 720p reference if the switcher is operating in 720p.
The standard 720p reference signal does not include the field
information required for referencing interlaced video.
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REF
LOOP
LOCK
IN
Lock Indicator