VBI is an acronym that stands for "Vertical Blanking Interval." It refers to a specific time interval or period in video and television systems that is responsible for various essential functions. The VBI is the time period between the end of one video frame and the beginning of the next frame.
During the VBI, several crucial processes take place, including the retrace of the electron beam in cathode-ray tube (CRT) displays, the resetting of display information, and transmission of additional data.
One of the primary functions of the VBI is the vertical retrace of the electron beam, which enables it to return to the top of the display screen before generating the next frame, ensuring smooth and consistent image reproduction. This process allows for the inclusion of additional information during the VBI, such as closed captioning, teletext, program guide information, and other data.
The VBI interval is typically not visible to viewers as it occurs during the blanking period when the display is not active. However, modern display technologies, such as LCD and OLED screens, do not require the same retrace mechanisms as CRT displays, making the VBI concept less relevant in these cases.
VBI plays a crucial role in video production, broadcasting, and display technologies by facilitating the transmission and integration of additional information between video frames.
