nonresident training course - Historic Naval Ships Association

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Figure 1-3.-Inter1aced scan of a CRT. merge point. Two methods are used to increase the resolution of CRTs. These are interlaced scan and noninterlaced scan. INTERLACED SCAN.– Interlaced scanning makes it possible to double the number of horizontal lines in a picture. Figure 1-3 illustrates the principle of interlaced scanning in which two scans are required to display the full picture. The odd raster starts in the top left corner of the CRT, while the even raster starts in the top center of the CRT. The two complete scans paint the entire picture. By interlacing the odd and even lines of a picture, resolution can be increased without a noticeable flicker on the screen. Interlaced scanning is used with standard television and some computer monitors. It increases the maximum number of lines per frame to 525. Because of the vertical retrace time, the number of visible lines is 512. Interlaced scan CRTs are fine for television transmissions and alphanumeric displays, but can cause a visible flicker when displaying fine digital graphics because of the abrupt changes in the levels of intensity required. To solve this problem, most computer monitors use noninterlaced scan. NONINTERLACED SCAN.– Noninterlaced scanning paints the entire frame of data from top to bottom. Figure 1-4 illustrates the noninterlaced scanning method of painting a single frame. To paint an entire frame without a noticeable flicker, the horizontal frequency is increased, which increases the number of lines per frame. The vertical frequency is also decreased from 60 Hz to 50 Hz in most monitors, which further increases the number of lines. 1-4
Figure 1-4.—Noninter1aced scan of a CRT. Vector Scan Vector scan CRTs are used extensively in the Data Display Group ANK/UYA-4(V) plan position indicators (PPIs). The circular display screens provide control and display of conventional radar sweep and video data and computer-generated symbology. The CRTs used in the PPIs use electrostatic deflection The methods used to develop the deflection and unblinking signals for radar sweep and video are similar because the same CRT beam is used to develop both presentations. However, the methods used to develop the radar sweep and video are different from the two methods used to develop symbology. In the following paragraphs, you will learn how the X/Y coordinate system is used to position the CRT beam. The X/Y coordinate system uses a grid as a frame of reference. Figure 1-5 illustrates the concept of the X/Y coordinate system. The horizontal line is the X axis, and the vertical line is the Y axis. The intersection of the two lines is the origin of all deflection signals. The origin is normally located at the center of the CRT, but may be offset from the center by operator action. Figure 1-5.—The X/Y coordinate system. The origin is the starting point for measuring along both axes. To the right of the origin, values on the X axis are positive; to the left, values are negative. The values above the origin on the Y axis are positive; below the origin, they are negative. A point anywhere on the screen of the CRT may be defined by two values: an X coordinate and a Y coordinate. The X coordinate is used to develop the horizontal deflection of the CRT beam. A positive X value will move the beam to the right of the origin; a negative X value will move the beam to the left of the origin. Vertical deflection is derived from the Y coordinate value. A positive Y value will deflect the beam upward from the origin, and a negative value will move the beam down. The appropriate X and Y values can be used to position the beam to any point on the CRT. The combination of positive and negative X and Y signals divides the CRT into the four quadrants illustrated in figure 1-5. A third signal is required to control the blanking of the electron beam. The Z (unblank) signal is used 1-5
Page 1 and 2: NONRESIDENT TRAINING COURSE July 19
Page 3 and 4: PREFACE By enrolling in this self-s
Page 5 and 6: CONTENTS CHAPTER PAGE APPENDIX 1. B
Page 7: PASS/FAIL ASSIGNMENT PROCEDURES If
Page 11 and 12: CHAPTER 1 BASIC DISPLAY DEVICES AND
Page 13: voltage of the control grid varies
Page 17 and 18: DISPLAYING RADAR SWEEP, VIDEO, AND
Page 19 and 20: Figure 1-8.—The AN-UYQ-21(V) symb
Page 21 and 22: Figure 1-10.—Development of an an
Page 23 and 24: zero, one, two, or three grid point
Page 25: two major types of deflection syste
Page 28 and 29: horizontal and vertical timing sign
Page 30 and 31: Liquid crystals have been used for
Page 32 and 33: . . . sticking, the key can be remo
Page 35 and 36: CHAPTER 3 THE DATA DISPLAY GROUP AN
Page 37 and 38: Figure 3-1.—The AN/UYA-4(V) data
Page 39 and 40: channel. Each of the ship’s senso
Page 41 and 42: Figure 3-7—The input data word fo
Page 43 and 44: Figure 3-12.—The 48-label readout
Page 45 and 46: CDS computer. Display consoles in t
Page 47 and 48: Figure 3-16.—PPI console control
Page 49 and 50: Figure 3-19.—A PPI equipped with
Page 51 and 52: Figure 3-22.—A PPI console commun
Page 53 and 54: DISPLAY SYSTEM SIMULATION AND TESTI
Page 55 and 56: Test Pattern Mode The test pattern
Page 57 and 58: Figure 3-26.—An electronic plug-i
Page 59 and 60: CHAPTER 4 THE COMPUTER DISPLAY SET
Page 61 and 62: The Computer Display Set AN/UYQ-21(
Page 63 and 64: Figure 4-5.—Central data buffer (
Page 65 and 66:
azimuth data are decoded for ∆Χ/
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amplifies the video signals to the
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from the graphics processor is rece
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Figure 4-14.—The basic display un
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trains from the RAC, counts the pul
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Figure 4-19.—A Display Control Co
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Monitor Deflection Function.— The
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the fiber-optic substrate of the li
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O-data receivers Input/output (I/O)
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DUAL TELEVISION SCAN CONVERTER (DUA
Page 85 and 86:
APPENDIX I LIST OF ACRONYMS ACDS—
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APPENDIX II REFERENCES USED TO DEVE
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Detailed Functional Theory and Refe
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P Personal computers, 2-1 input dev
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ASSIGNMENT 1 Textbook Assignment:
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1-17. Developing the display or pic
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1-35. 1-36. 1-37. What geometric sh
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1-52. 1-53. 1-54. 1-55. The RGB mon
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1-70. Which of the following keys w
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2-8. Which of the following signals
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2-27. 2-28. 2-29. 2-30. 2-31. Displ
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2-45. The console can provide the o
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2-63. Which switch is used to contr
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ASSIGNMENT 3 Textbook Assignment: T
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The signs 3-16. of ∆Χ and ∆Υ
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3-34. Which functional area compile
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3-53. 3-54. 3-55. 3-56. 3-57. Which
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3-71. 3-72. What equipment provides
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nonresident training course - Historic Naval Ships Association

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