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The Quantum Data 882 Video Test Generator has a variety of settings to provide you with a high degree of flexibility in testing HDMI sink devices. If you are concerned with digital video quantization ranges, you should be aware of how the various settings affect the digital signal as well as the AVI infoframe. This application note describes these commands and explains how to make sure you have the proper settings for your application. You can download the application note from this link:
QD_Quantization_Range_v2.pdf
The XAVI:RGB command sets the AVI Infoframe RGB quantization range indicator bits without changing the acutal quantization range of the digital video. This command is executed from the 882 command prompt, which can be inconvenient when the user is operating the instrument from the front panel. Using Quantum Data's ScriptSDK functionality, we have developed plug-in scripts that allow the user to set the quantization bits from the front panel. These plug-ins can be downloaded from this link:
AVI RGB Plug-In Scripts
These plug-in scripts for the Quantum Data 882E, 882EA, 882C, 882CA, and 882D video generators allow the user to set the Quantization Range bits in the transmitted AVI Infoframe. Three scripts are provided to allow easy front-panel setting of the Q bits to indicate Default, Limited, or Full range.
Without the use of these scripts, changing these settings requires the use of the XAVI:RGB command through the 882 Command Line interface, either through RS-232, ethernet telnet, web CMD Terminal, or GPIB.
Note: These scripts do not affect the actual digital video RGB Quantization Range. They only set the AVI Infoframe bits that are used to indicate the quantization range of the video stream. The 882 is a flexible test instrument, and it is easy to choose combinations of settings that are illegal, so the user should be aware of the proper settings for specific testing needs.
Installation:
- Unzip the 3 *.o files to your PC.
- Launch the 882 Web Interface and select FTP Browser.
- In the left pane of FTP Browser, browse to tffs0:/Library.
- If folder tffs0:/Library/Scripts does not already exist, create this folder.
- In the right pane of FTP Browser, browse to the unzipped *.o files.
- Highlight and download the 3 files to the tffs0:/Library/Scripts folder of the 882.
Usage:
- Press the TOOLS key so that you see the Tools menu (with System and Reports at the top.)
- Press the down arrow to scroll the menu down so that you see ScriptSDK.
- Press the soft key for ScriptSDK.
- Press the soft key for the desired script, then watch the front-panel display to verify the proper function.
Note: These settings will be overridden when you select a different video format, and possibly when you make other settings on the 882. Therefore, it is recommended that you re-select your desired script after making other format-related changes.
ZIP File Contents:
- avirgb0.o Sets Tx AVI RGB Q bits to 0:0 to indicate Default range
- avirgb1.o Sets Tx AVI RGB Q bits to 0:1 to indicate Limited range
- avirgb2.o Sets Tx AVI RGB Q bits to 1:0 to indicate Full range
- AVIRGB.txt Instructions
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