Quantum Data 802BT User Manual

Page 705

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802BT/802R Video Test Generator User Guide

695

The remaining central 8% of the image contains a row of chroma set bars. These bars

are part of the SMPTE pattern but are not in the EIA pattern. The order of the

alternating color and black bars matches those in the SMPTE pattern.

Test

Color video performance

Purpose

This general purpose pattern can be used to check the video handling capabilities of most

parts of a television system.

Method

When viewed on a TV screen, all of the upper color bars should be correct and in the order

shown. The hue and intensity of each bar should be uniform over the entire bar.

The image can be used with a TV waveform analyzer to check the performance of a video

system. The upper color bars, as they would appear on a waveform analyzer, are shown

on a previous page.

Test

Color decoder performance

Purpose

The image can used with a TV vectorscope to check for proper operation of a video color

decoder. Vectorscope signatures of the upper and lower portions of the image using

NTSC encoding can be found on the previous page.

Method

The vectorscope signature for the color bars should hit the target test point for each color

on the vectorscope’s graticule. If you are using PAL encoded video, the signature will be

similar to the one shown for the TVBar_75 test image on page page 702.

The three “legs” of the vectorscope signature for the -I and Q color difference signals

should match the Burst, -I and Q reference lines on the vectorscope’s graticule.

The following tests are based on the original SMPTE guideline:

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