The CRT converts the video signal into visual images
Need for Interlace Scanning
This is a convenient time to explain why the interlace scanning method is used in the NTSC (National Television System Committee) television system. Our TV system was developed over 50 years ago. Engineers had to work within the limitations of the time. One of those limitations was the phosphor coating of the CRTs. When the CRT's electron beam struck a phosphor on the face plate, it caused that phosphor to glow. As soon as the electron beam left the phosphor, the glow started to get weaker. If our CRT scanned from line 1 all the way down to line 525 in succession, by the time the electron beam got to the bottom of the picture, the top of the picture would be pretty ...
Get Basic TV Technology, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
