A graphic display system has a frame buffer that is 640 pixels wide, 480…
2018
A graphic display system has a frame buffer that is 640 pixels wide, 480 pixels high and 1 bit of color depth. If the access time for each pixel on the average is 200 nanoseconds, then the refresh rate of this frame buffer is approximately :
- A.
16 frames per second
- B.
19 frames per second
- C.
21 frames per second
- D.
23 frames per second
Attempted by 100 students.
Show answer & explanation
Correct answer: A
Solution: Compute the refresh rate step by step.
Total number of pixels = 640 × 480 = 307,200 pixels.
Time to refresh one frame = 307,200 pixels × 200 ns/pixel = 61,440,000 ns = 0.06144 s.
Refresh rate = 1 / 0.06144 s ≈ 16.28 frames per second.
Therefore the refresh rate is approximately 16 frames per second.
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