3 ms·
The little signal bars use an algorithm to represent the constantly moving signal-to-noise ratio. The problem with them is that we know nothing about what's ins
by bradleyland 16y ago
The little signal bars use an algorithm to represent the constantly moving signal-to-noise ratio. The problem with them is that we know nothing about what's inside the algorithm. From observing the output of field test mode on an older iPhone, I gather this:
* The bars represent a moving average (instantaneous readouts aren't very usable anyway)
* There is a delay in what is reported, even when accounting for the moving average; conceivably to prevent jumpy reports
* The bars use some type of logarithmic scale, which makes sense when you understand digital signal degradation
- eli 16y agoYou sure about that? I admit I don't know about the iPhone, but most every other phone I've seen doesn't take noise into account at all.
- nooneelse 16y agoI'm curious about the nature of this scale http://images.anandtech.com/reviews/gadgets/apple/iphone4/bars.jpg http://images.anandtech.com/reviews/gadgets/apple/iphone4/ba... . Why does it have bar widths of (left to right) 6, 4, 2, 10, 40 dB? How does the logarithmic scale explain that, if it does?