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Am I missing something here, but if there is a bug in how they calculate bars shouldn't it apply equally in all the cases. for example, if signal == some-weak-
by yumraj 16y ago
Am I missing something here, but if there is a bug in how they calculate bars shouldn't it apply equally in all the cases.
for example, if signal == some-weak-signal, then bars = 5
then, if signal == some-weak-signal - 1 (for example), then shouldn't bars = 4 instead of bars = 0 (or 1).
This seems like horseshit to me.
Though it seems people are buying this explanation, so as far is Apple is concerned, it worked.
- jsz0 16y agoBars are a very basic representation of a complex set of logarithmic measurements. I don't think it's all that simple. They're probably doing something like a 95th-percentile calculation on top of that. You don't want to change the bar signal meter for every normal fluctuation in RF. Otherwise the bar meter would constantly be moving up and down all the time. From an RF perspective it's also not as simple as just looking at the signal level. You can have great signal levels and poor SNR for example.
- ugh 16y agoAnandTech looked into how the iPhone maps signal strength to bars: http://www.anandtech.com/show/3794/the-iphone-4-review/2 http://www.anandtech.com/show/3794/the-iphone-4-review/2 (scroll down to the bar chart) A 30 dB drop can both not change how many bars are displayed at all or get you down to no bars at all. If you have a signal strength between -51 dB and -61 dB and the signal drops 30 dB five bars will still be displayed. If you have a signal strength between -83 dB and -91 dB and the signal drops 30 dB you go all the way from five bars to zero bars. What AnandTech found seems consistent with what Apple writes. More or less, at least. The drop in signal strength when holding the phone is a bit larger than with other phones (and previous iPhones), but not dramatically so. That’s the only thing Apple is still quiet about.