Integrated Publishing

Army Communication Systems

Analyzing Color Video and Video Test Signals

Describe the fundamentals of color used in television transmission.

Describe and identify the four basic color bar test signals.

This subcourse supports the following MOS 26T tasks

Table of Contents

Table of Contents (cont)

Introduction to Analyzing Color Video and Video Test Signals

Lesson 1. Describe fundamentals of color

Limits of vision.

Light Sources.

Wavelengths in the region of light are measured in millimicrons.

Figure 1-4. Effect of prism on white light

Qualities of color.

Figure 1-6. The expression circles of color mixing

Figure 1-7. Phosphorous dots

Commission Internationale de l'Eclairage (CIE)

Figure 1-9. CIR chromaticity diagram and the NTSC triangle

Learning Event 3: Describe NTSC Color Transmission System

Figure 1-10. Compatibility

Figure 1-11. Reverse compatibility

Figure 1-13. Distribution of energy in the frequency spectrum of a standard monochrome signal

Figure 1-14. Interleaving of color with luminance signals

The second component of the television signal is the color signal

Figure 1-15. Black and white video energy distribution

Tolerance of subcarrier frequency.

Figure 1-17. R-Y and B-Y chromaticity coordinates

High definition color transmission.

Figure 1-18. Vector diagram

Figure 1-19. Basic colorplexer simplified block diagram

Band limiting and delay.

Two-phase modulation (generation of the color signal)

Figure 1-22. Doubly balanced modulator

In the mixer section of the colorplexer

Figure 1-23. Horizontal blanking interval

Practice Exercise

Lesson 2. Describe the color bar test signals.

The encoded color bars signal consists of two major parts.

Figure 2-1. The first three-fourths of the active scanning lines in the encoded color bars signal

Figure 2-2. The remaining one-fourth of the active scanning line of the encoded color bars signal

Learning Event 2: Describe the Alignment Color Bars Test Signal

Figure 2-3. EIA standard RS-189 encoded color bars signal

Figure 2-5a. One line of chroma set signal, X-X1

Figure 2-5b. One line of black set signal

Figure 2-6. Chroma amplitudes

Figure 2-9. SMPTE chroma and hue set matching diagram

Figure 2-10. SMPTE black set matching diagram for brightness

Figure 2-11. Full field color bars signal

Figure 2-12. Split-field Y ref

The gated rainbow pattern

Figure 2-15A and 2-15B. (A) Picture monitor presentation (B) oscilloscope display

Practice Exercise

Lesson 3. Describe the basic electronic television test signals.

Figure 3-1. Basic block diagram of a multiburst generator

Figure 3-2. Standard multiburst signal

The gray-scale linearity (stairstep or sawtooth) signal

Grayscale test signals

Figure 3-4. Variation of signal excursions with APL

Figure 3-5. Specification for the stairstep signal

Learning Event 2: Describe the Vertical Interval Test Signal and the Vertical Interval Reference Signal

Figure 3-6. Specifications for field one (VITS)

Figure 3-7. Specifications for field two (VITS)

Figure 3-8. Specifications for full-frame test signal

Vertical interval reference (VIR) signal.

Figure 3-9. Standard vertical reference signal

Learning Event 3: Describe the Sin2 Window Signal

Figure 3-10. Basic block diagram of sin2-pulse and window generator

Figure 3-11. Pulse-window signal specifications

Figure 3-12. Display of 20T, T pulse and window

Figure 3-14. Basic qualities involved in explaining K-factor

Figure 3-15. Pulse transition along positive time base

Figure 3-16. Basic K-factor

Figure 3-18 illustrates the basic T-pulse responses encountered.

Figure 3-18. Basic T-pulse

Ringing.

Figure 3-20. LD with leading and trailing positive streaking

Field-time Waveform Distortion

Figure 3-21. RCL only, no phase distortion

Figure 3-22. RCT only, no amplitude distortion

Practice Exercise

Answers to Practice Exercise

 

Analyzing Color Video and Video Test Signals

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