Tektronix TG700, Руководство пользователя

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HD3G7 HD 3 Gb/s SDI Video Generator
Therefore, for this AFD code set the data words as follows:
UDW [000]:
UDW [001]:
UDW [002]:
UDW [003]:
UDW [004]:
UDW [005]:
UDW [006]:
UDW [007]: 0x4C
0x00
0x00
0x00
0x00
0x00
0x00
0x00
The AFD ancillary data packet should be located in the active line portion of
the vertical ancillary space (VANC), but no earlier than the second line after
the RP 168 switch point. Line 9 with a sample offset of 0 (
fi rst word of active
video, immediately after SAV) is a suitable location. The selected video channel
should be ’Luma’ for most ancillary packets, including AFD. Finally, set the
ANC
PAYLOAD Output mode to Continuous to start AFD insertion of the active test
signal. For this example, the SMPTE RP 219 color bars are an effective test
pattern, because the center section of the 16:9 test signal contains the original 4:3
aspect ratio SMPTE pattern.
SMPTE 352 PAYLOAD
Use the left ( ◄ ) or right ( ► ) arrow button to Enable or Disable the SMPTE 352
Payload Identi fi er, and then press the ENTER button to con fi rm the selection.
NOTE.
The SMPTE 352 payload identi fi er is a required element for a compliant
3Gb signal stream. In most cases the SMPTE 352 payload setting should be
Enable .
TRIGGER OUTPUT
Submenu
Use this menu to select line rate, frame rate, or the system clock of the module
to trigger an external instrument. The following
fi gure shows the TRIGGER
OUTPUT submenu.
Figure 3-94: HD3G7 module TRIGGER OUTPUT submenu
System Clock.
The system clock is an internal parallel rate clock (a low frequency
clock related to the pixel rate of the video signal).
Frame / Field Pulse.
The trigger pulse is produced at the fi eld or frame rate of
the video signal. In interlaced and segmented-frame formats this produces a
frame-rate square wave that is low during
fi eld one and high during fi eld two.
In progressive formats the output is high during the vertical blanking period,
producing a
fi eld-rate pulse.
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3–182 TG700 TV Signal Generator Platform User Manual