How to Use the Instrument
Description and Applications of the Test Patterns
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ADC Check 1
ADC Check 1 is a combined B/W and color pattern with eight horizontal bars. The color
contents are matched to 625 or 525 line systems.
•
Bar 1: Luminance ramp from black to white
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Bar 2: as bar 1 but with swapped MSB/LSB
•
Bar 3:
625 Line System 525 Line System
V ramp, U = 0, I ramp, Q = 0,
R - Y = -0.887 to +0.887, I = -0.734 to +0.734
Y = 50% Y = 53.8%
Note: Color Green exceeds the nominal range
•
Bar 4:
625 Line System 525 Line System
U ramp, V = 0, Q ramp, I = 0
B - Y = -0.701 to +0.701, Q = -0.520 to +0.520
Y = 50% Y = 53.8%
Note: Color Green exceeds the nominal range
•
Bar 5: Luminance ramp from black to white
•
Bar 6: Red ramp, primary color signal level 0% to 100%
•
Bar 7: Green ramp, primary color signal level 0% to 100%
•
Bar 8: Blue ramp, primary color signal level 0% to 100%
Figure 4-98. ADC Check 1
Applications:
This test pattern is used to check the correct converting of luminance and chrominance
signals in the AD converters in modern TV equipment.
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