Mice and frequency

[Guest]

Can someone explain the relationship between the frequency of the mouse port (USB or PS/2) and the frequency of the mouse itself? This is more in relation to the optical mice. Why does it matter what frequency the optical camera takes pictures at (1500Hz, 2000Hz, 6000HZ) when the port is only accepting data at a much lower frequency (~40Hz PS/2 or ~120Hz USB)? How is data transmitted across the connection in such a way that the different frequencies don't cancel each other out?

Thanks.

 

[FatBurger]

Here are my thoughts, they might not be perfectly accurate:

The camera must take faster pictures in order to correctly interpret the moving of the surface beneath it. Mice would work ok at a much lower rate, as long as it was a perfect surface. When you put it on harder surfaces, it gets harder to use. Note how in the article here on Tom's, the mouse with two sensors worked well on a surface that none of the others would work on.

The refresh rate at the port can be slower, since it only needs to move the mouse at this rate. 100Hz should be more than enough to keep it a smooth movement, but it's hard to say.

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