VIDEO FORMATS & STANDARDS
Video format standards refer to the specific formats and specifications used for transmitting video signals to CRT displays. These standards determine various aspects of the video signal, including the color encoding, resolution, aspect ratio, scan lines, and frame rates.
One commonly used video format standard in CRT technology is the NTSC (National Television System Committee) standard. NTSC is primarily used in North America and Japan. It operates at a resolution of 525 lines and a frame rate of approximately 30 frames per second (29.97 frames per second to be precise). The aspect ratio is typically 4:3, which means the width of the screen is four units for every three units of height.
Another widely used video format standard is PAL (Phase Alternating Line). PAL is primarily used in Europe, Australia, and parts of Asia. It operates at a resolution of 625 lines and a frame rate of approximately 25 frames per second. Like NTSC, the aspect ratio is typically 4:3.
In addition to NTSC and PAL, there is also the SECAM (Séquentiel couleur à mémoire) video format standard. SECAM is primarily used in France, Russia, and some other countries. It operates at a resolution of 625 lines and a frame rate of approximately 25 frames per second, similar to PAL. However, SECAM utilizes a different method of color encoding and transmission compared to NTSC and PAL.
Both NTSC, PAL, and SECAM video formats utilize interlaced scanning, where each frame is divided into two fields, with odd-numbered lines displayed first followed by even-numbered lines. This scanning method reduces flickering and provides a smoother motion on CRT displays.
Overall, video format standards in CRT technology define the characteristics of the video signals used to display content on CRT displays, ensuring compatibility and consistent performance across different regions and devices.