07-30-2008, 08:00 PM
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Contributing Editor Emeritus
Join Date: Aug 2006
Posts: 8,228
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Your Phone Is Lying About The Battery Level And Signal Strength
"Your mobile phone is lying to you. So is your laptop. And not just when they whisper to you in the night.Mobile phones, and most modern laptops, have signal strength and battery life displays. One or both of these displays has probably been the focus of all of your attention at one time or another.Neither display is actually telling you what you think it's telling you."
Here is an interesting article on what your battery indicator and signal strength icons on your phone are telling you. It explains why when I am sometimes in an area that has "full signal strength" that calls are dropped or of really bad quality.
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07-30-2008, 08:20 PM
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Pupil
Join Date: Oct 2007
Posts: 20
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That explains why my piece of crap Apache shows 4 bars - then when I actually connect it drops to 1 bar. Good article!
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07-30-2008, 08:56 PM
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Editor Emeritus
Join Date: Sep 2006
Posts: 3,060
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Quote:
Originally Posted by nmcclana
That explains why my piece of crap Apache shows 4 bars - then when I actually connect it drops to 1 bar. Good article!
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...and how I can maintain a look of complete attention on my face no matter how long my wife talks to me. 
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07-30-2008, 09:27 PM
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Philosopher
Join Date: Mar 2008
Posts: 518
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Interesting article on both counts!
The Signal Strength vs Interference problem applies not only to cell phones: many FM receivers also display Signal Strength - but a relatively few (at least at the Affordable Price Points) also display Multi-Path Interference: with my old Marantz, you often get noticeably better sound by adjusting the antenna for Minimal Interference as opposed to simply Maximum Signal Strength...
The battery gauge is a hoot: my Razr will display 2 bars, but plug it into the Charger and it immediately drops to 1 bar.... Leave it in the charger for only a few minutes it comes out right up to Full Charge!
Cynical view of American Mobile Phone Service Providers however - surely NONE of them would spec a phone that Deliberately Misleads their customers?!?!?
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07-30-2008, 11:03 PM
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Intellectual
Join Date: Aug 2006
Posts: 156
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Another example is the speedometer of my car. The reading from the speedo is always faster than the reading from another source, say a GPS. The manufacturers probably say that it is a safety feature.
__________________
Why, oh why didn't I take the blue pill?
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07-31-2008, 03:47 AM
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Neophyte
Join Date: Jul 2008
Posts: 4
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Accuracy vs. battery drain
Just a thought, but it would take more cpu cycles to accurately measure the battery and signal strength.
The code required to quickly check the signal level, is 1/3 the code to measure the signal strength, noise level and calculate the snr. This might seem like a minor thing, but in an embedded environment, every cpu instruction counts. You also have to figure in the fact that the signal calculation is performed every 15 to 30 seconds.
It all adds up to reduced battery life to perform the extra calculations over and over again. So they sacrifice the accuracy of a few widgets to give you better talk/standby times.
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07-31-2008, 03:50 PM
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Intellectual
Join Date: Aug 2006
Posts: 160
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Quote:
Originally Posted by subzerohf
Another example is the speedometer of my car. The reading from the speedo is always faster than the reading from another source, say a GPS. The manufacturers probably say that it is a safety feature.
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You are right! My speedo always seems to be reading a speed higher than the speed limits. Even when I drive the same speed as the cops! 
"And remember: Measuring signal without measuring noise is like only counting the goals your team scores." <-Good quote.
I bet thats why most phone battery meters only have 3 bars now. What can you really tell from an indicator that only has 3 levels? I bet the categories are something like 100-50%, 50-25% and 25-0%. My PPC 6700 reported the battery in 1% increments. New WM devices only give it in 10% increments, though it can be hacked to be 1%.
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