HD9084 HDTV Caption Encoder Manual
Page 3-20
OPERATION
3.4.3.2.
VANC Keyer Ctrl
The VANC Keyer Ctrl function allows the user to control the VANC keyer using the front panel
KEYER
ON/OFF
pushbutton or via GPI. If the VANC Keyer Ctrl is set to Button Only, the front panel
pushbutton is enabled and will turn the HD Ancillary data ON or OFF. If the VANC Keyer Ctrl is set to
GPI mode, the user can first choose a GPI to control the VANC Keyer function. GPI’s A through G are
available. Once the GPI is set, the external trigger will now control the VANC Keyer. Please refer to
sections 2.5 for GPI/O configurations.
3.4.3.3.
Service Info Encode
The SVC INFO ENCODE feature allows the user to Enable or Disable the encoding of the optional
Caption Service Information section in the CDPs. Refer to section 3.4.6 for information on configuring
the Caption Service Information payload.
3.4.3.4.
Swap F1/F2 Order
Certain compression encoders require that the order of CEA-608 field-1 and field-2 data is reversed
when encoding in CDPs. This control has two options: Normal or Swapped. The default is Normal. We
recommend leaving this setting at Normal unless specifically instructed by the compression encoder
manufacturer.
3.4.3.5.
CEA-708 Test Msg
The CEA-708 Test Message provides captions on Services 1 through 4. Each service shows a
different caption test pattern.
Service 1:
Service 1 provides a 2 window caption roll-up/down test message with the following write patterns.
Service 1 provides a 2 window split test message. The caption is mirror imaged to provide a full range
of decoder testing. The quadrants are divided as follows:
Top Window:
Writes captions left to right. Scrolls Top to Bottom.
Bottom Window:
Writes captions left to right. Scrolls Bottom to Top.
Service 2:
Service 2 is a background/foreground colour cycle with transparency tests for background. The test
message cycles through the different colour options as specified by CEA-708B.
Service 3:
Service 3 tests caption positioning using a "bouncing Evertz Logo" test. The Evertz Logo is moved
around the screen to all possible caption position points.
Service 4:
Service 4 is an on screen hex dump of the caption character set. The hex dump is written right to left
and scrolls bottom to top.
This feature helps users test downstream equipment such as HDTV decoders and ATSC encoders.
Please refer to the testing section for detailed instructions. Unlike most settings, the CEA-708 Test
Message will revert to “Off” after power is removed from the HD9084.
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