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1
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- A Course on the Proper Operation of the DTP 220
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2
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- The Leitch Digital Turnaround Processor Model 220 is the heart of the
new digital broadcast facility. The DTP 220 combines the Create-SD,
Knowledge Net/World-SD and WUFT-HD signals into one data stream. This
allows WUFT-DT to multicast 3 separate program streams or channels to
our viewers.
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3
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- This is a view of the DTP 220 software interface showing the proper
configuration of the inputs and outputs.
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4
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- The DTP 220 software interface will appear as below when no inputs or
outputs have yet been selected. In this state, the station will be off
the air (there is no signal being broadcast).
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5
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- To configure the inputs you must identify if the inputs are present and
functioning properly.
- Use your mouse pointer and left click on the icon labeled “Server
Input”, open up the branch by clicking on the “ASI 1” icon, then the
“WUFT-HD SWT” icon. You should then see an icon resembling a TV monitor.
It should be shaded Blue. This indicates that the input is present and
functioning properly. If it is grayed out, there is no signal present at
the input.
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6
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7
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- The procedure to view the input 2 and 3 configurations is similar to
that used for input one.
- Click on the “ASI 1” icon to expand out the view to show the “WUFT1” and
“WUFT 3” icons. Then click on them to show the Program 2 and Program 3
TV Monitor icons. They should also be shaded Blue
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8
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9
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- The answer is “c” . There is no active input to the DTP 220.
- 1) The input 1:1 monitor icon is gray.
- a) The output bit rate is low.
- b) The PSIP is not enabled
- c) There is no input present.
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10
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- The answer is “b”. The DTP 220 allows the broadcast of 3 separate
program streams.
- The DTP 220 allows the station to:
- a) Broadcast in Spanish
- b) Multicast 3 program streams
- c) Add closed captioning
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11
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12
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- Another important function of the DTP 220 is to integrate PSIP (Program
and System Information Protocol) into the transmit data stream. The PSIP
data comes from the Guildebuilder input. This is the proper screen
representation of the PSIP data input. PSIP contains program
descriptions, a channel schedule and virtual channel tables required for
a DTV tuner to receive programs.
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13
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14
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- By clicking on the WUFT-DT/TV output icon we see “Add Program” as an
option. If we choose this option
we get a menu item called “splice input”. We can use this to choose an
input to connect to an output, or simply “drag and drop” an input on top
of any output icon.
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15
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- Output configurations are set by clicking on the appropriate output
icon. In this case, we are viewing the HD output. The PIDs must align
with the Program numbers for proper decoding at the viewer’s TV
set. The values are shown in the
graphic. You can see the current source “spliced” to the output. Also
EAS must be “Enabled” for each channel.
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16
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- The answer is “C”. The eBox allows the DTP 220 to be configured for EAS.
- The eBox allows the DTP 220 to be configured for :
- a) PSIP (Program and System Information Protocol)
- b) EAS (Emergency Alert System)
- c) Proper output bit rate
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17
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- The answer is “b”, PSIP does not add closed captioning to the output
signal.
- PSIP (Program and System Information Protocol) does all of these except:
- a) Virtual Channel tables
- b) Closed Captioning
- c) Program Descriptions
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18
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- The DTP 220 multiplexor is the device that brings all of the signals and
programming material together and formats them for transmission. The DTP
220 must be set up and functioning properly for the television station
to provide any output to the viewer.
- All of the screenshots used in this presentation are copyrighted by
Harris Broadcast Communications.
- Presentation created by Bob Wood
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Notes
