Quantum Data 881 User Manual page 689

DVQM
Class
Description
Command syntax
Query syntax
Example
Related commands
882 Video Test Instrument User Guide (Rev A.35)
Digital Video Quantization Mode
Format parameter setting - Digital video signal
Controls the range of digital signals per the EIA/CEA-861-C standard.
The DVQM? query returns the current DVQM mode.
DVQM mode
mode
Use the following table to determine the proper mode (0, 1, or 2).
DVQ
Components
Mode
0 RGB
YC C
b r
1 RGB
YC C
b r
2 RGB
YC C
b r
Notes:
• Computer (for example, DMT and CVT) formats set DVQM=0 for full range.
• DVQM can be set to 1 to test the undershoot/overshoot signal code margins (for
example, see SMPTE 296M section 7.12).
• Television formats (for example, 1080i29) set DVQM=2 for reduced range required by
various television standards (for example, EIA/CEA-861-C).
DVQM?
DVQM 1 // Sets the quantizing mode to 1.
FMTU // Applies the format change
LMIN, LMAX, NBPC
NBPC=8 ranges NBPC=10 ranges
LMIN LMAX LMIN
0 255 0
0 255 0
1 254 4
1 254 4
16 235 64
16 240 64
NBPC=12 ranges
LMAX LMIN LMAX
1023 0 4095
1023 0 4095
1019 16 4079
1019 16 4079
940 256 3760
960 256 3840
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