Line rate and Aggregate data rate.

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written 6.7 years ago by

teamques10 ★ 68k

Line rate is an important parameter of a video system: Line rate is simply the frame rate multiplied by the number of lines per total frame.
The aggregate data rate is the number of bits per pixel, times the number of pixels per line, times the number of lines per frame, times the frame rate.
In both analog and digital video it is necessary to convey not only the raw image information, but also information about which time instants (or which samples) are associated with the start of frame, or the start of line.
This information is conveyed by signal synchronization or sync elements. In analog video and composite digital video, sync is combined with video by being coded at a level blacker than black.
In 625/50 PAL there is not an exact integer number of samples per line: Samples in successive lines are offset to the left a small fraction, 4⁄625 of the horizontal sample pitch.
The data capacity required for the active pixels of a frame is computed by simply multiplying the number of bits per pixel by the number of active pixels per line, then by the number of active lines per frame.
To compute the data rate for the active pixels, simply multiply by the frame rate.

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