In terms of moving pictures, whether they be on computer video clips, or television broadcasts, or movies, or whatever, frame rate refers to rate at which still image frames are changed. Frame rate is usually measured in fps, frames per second. The higher the number the better.
Frame rates vary depending on the video standard used. In North America and other areas that use NTSC as the standard definition color system, the standard frame rate is 29.97Hz. When the signal is interlaced (Standard definition, and 1080i in high definition) two fields are used to make a complete frame, so the field rate is 59.94Hz. High definition 720p is non interlaced, so the frame rate is 59.94Hz. In Europe, PAL is the color system and the frame rate is 25Hz, with a 50Hz field rate.
Refresh rate (most commonly the "vertical refresh rate", "vertical scan rate" for CRTs) is the number of times in a second that display hardware draws the data. This is distinct from the measure of frame rate in that the refresh rate includes the repeated drawing of identical frames, while frame rate measures how a video source can feed an entire frame of new data to a display. For example, most movie projectors advance from one frame to the next one 24 times each second. But each frame is illuminated two or three times before the next frame is projected using a shutter in front of its lamp. As a result, the movie projector runs at 24 frames per second, but has a 48 or 72 Hz refresh rate.
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