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MIO–CCE–4K/3G
SMPTE ST 2110/4K/3G/HD/SD Closed Caption Encoder with Media–to–IP Streaming
4.14.1. CC Setup Control
4.14.1.1. SD CEA-608 F1 and F2 Keyers
These controls allow the user to enable or disable the Field 1 Keyer & Field 2 Keyer
4.14.1.2. VANC Keyer
This control enables or disables the VANC Keyer. This is the global control for selecting whether any
VANC data is inserted or altered in output video. VANC data includes CDP, AFD, and Broadcast Flag
packets. Selecting VANC Key Off will disable the VANC keyer and not encode data into the VANC of the
output.
4.14.1.3. Caption Erase Timer
The Caption Erase Timer control is used to erase the caption display. When enabled, the MIO–CCE–
4K/3G will activate an internal timer and clock the time delay between processing caption data. If caption
data is not detected for a period of 15 seconds, the MIO–CCE–4K/3G will encode a clear caption command.
This command will be used by downstream decoders to clear the caption display.
4.14.1.4. SD CEA-608 Waveform Line
The SD CEA-608 Waveform Line parameter enables the user to the set the waveform line from 10 to 25.
4.14.1.5. SD CEA-608 Waveform Setup Shift
Setup Shift is used to select whether the caption data encoded on the downstream SDI video will be shifted
to adjust for setup on line 21. It is common for 4:2:2 component to NTSC video encoders to add setup to
line 21 regardless of whether there is a closed caption waveform on line 21 or not. The closed caption
waveform will be moved up by 7.5 IRE when setup is added by the video encoder. The CEA-608 waveform
specification states there should be no setup on line 21.
This control allows the operator to compensate for the setup when the encoding to NTSC video takes place
by shifting the caption data down by 7.5 IRE. Note that, in order to shift the caption data down by 7.5 IRE,
it is necessary to use digital video values that are not legal according to the SMPTE 125M Component
Digital Video specification.
0 IRE will encode the caption waveform with a baseline at 0 IRE on 4:2:2 video signals. The resulting
closed caption signal will contain legal SMPTE 125 data values, but may have 7.5 IRE of setup added when
it is encoded to a composite video signal (depending on the video encoder). -7.5 IRE will encode the caption
waveform shifted down by -7.5 IRE on 4:2:2 video signals. The resulting line of video will contain illegal
SMPTE 125 data values but may have the 7.5 IRE of setup cancelled out when it is encoded to a composite
video signal (depending on the video encoder).
4.14.2.
Caption Shift Control
4.14.2.1. Caption Shift Up GPI
This feature allows the user to shift the baseline of the CEA-608 captions up by 2 to 4 lines. This feature
is used when weather crawl information is keyed onto the SD-SDI video. GPI's A through F can be selected
to enable or disable this function. The Caption Shift Down GPI control is identical. For the sake of brevity,
only the Caption Shift Up GPI control will be discussed in the manual.
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Revision 1.0
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