SONY High Definition TV free download

File name dtv01_High Definition TV.pdf

S ® Training Manual High Definition Television Circuit Description and Troubleshooting Course: DTV-01 Table of Contents Introduction HDTV Transmission Stream Introduction to MPEG-2 Compression Model KW-34HD1 - Normal Operation Inputs Overall Block SIGNAL PROCESS Video Block 1 Video Process A Video Process B Video Block 2 Digital Realty Creation MID - Multi Image Driver Video Process C Video Block 3 Video Process D On Screen Display Video Process E Screen Voltage Control 29 31 33 35 37 41 43 45 47 49 51 53 1 3 9 19 21 25 POWER SUPPLY Power Supply Block Standby Power Converter 2 Overall Protection Block D Board Protection Block Protection Circuit 1 Protection Circuit 2 Protection Circuit 3 Protection Circuit 4 DEFLECTION Vertical Deflection Horizontal Deflection Block Horizontal Drive Horizontal Driver Horizontal Output PWM 1 Horizontal Output PWM 2 Pincushion Correction Picture Tilt Circuit Dynamic Focus Block 85 89 91 93 97 101 105 109 113 55 53 61 67 71 73 75 77 81 Dynamic Focus 1 - B+ Mfg. Dynamic Focus 2 - Location Dynamic Quadrapole Focus Appendix Set-Back Box Picture Size Modes Board Replacement Service Mode Display 117 121 125 i iii iv vi 1 Introduction TV Transmission Formats Standard Definition/High Definition Picture resolution is commonly measured in pixels or lines. The number of pixels is the number of black to white brightness changes possible on the screen first in a horizontal, then in a vertical row (e.g. 960x480). CRT manufacturing tolerances limits the number of pixels possible. This is a common resolution specification in a computer monitor CRT. In a TV broadcast, the studio camera is the limitation to higher resolution. The picture scanned by the camera is segmented by pixels similar to the viewer's CRT. The greater the number of pixels in the horizontal and vertical row, the greater the resolution. This will be the current resolution limitation as the USA makes the transition toward high definition digital TV. In a TV transmission, the ability of a signal voltage to quickly change from low to high and to produce a dark to white transition is comparable to a pixel. This is not a limitation in the transmission format, but the number of lines transmitted is and is used as a resolution measurement in transmissions. The number of lines transmitted in the current USA NTSC format is 525. This is considered a standard definition (SD) transmission. A standard definition (SD) transmission of 525 lines can be transmitted in the analog or digital mode. A higher definition (HD) transmission can be transmitted only in the digital (DTV) mode. Ё SDTV or SD ­ Standard definition is the current 525 lines of resolution transmitted, but only 480 of those lines are viewable. SD can be sent as an NTSC analog or digital (DTV) transmission. HDTV or HD ­ A high-definition transmission contains 720 or more horizontal lines. HD is transmitted only in a digital format. DTV ­ A digital TV transmission refers only to the digital encoding of the p