Help me find a new mobile phone

[VJ]

Battery consumption is proportional to processing time. Processing time *= (Number of packets)*(work per packet). Bitrate is a multiplier for work per packet.

So for a lower bitrate, the processor is clocked at a lower speed? Or are there simply more idle cycles?

Gucchi: I do trust you, I merely was curious as to what technical change was made to acchieve this.


Jörg

[GuchiGuh]

more idele cycles~

ok take a Mp3 at 128 kbps...
the phone processor needs to decode 12k8b per second...just say thats about 128 maths equations in one second..

so now take a 320kbps mp3...thats 320 maths equations per second....

now thats damn hard work, and it needs lots of energy to do that kind of work in the same time frame. so how does it get more energy? the battery of courze!

[VJ]

Originally posted by GuchiGuh
ok take a Mp3 at 128 kbps...
the phone processor needs to decode 12k8b per second...just say thats about 128 maths equations in one second..

so now take a 320kbps mp3...thats 320 maths equations per second....

You can accomplish the same by slowing down the CPU; that way you wouldn't get more idle cycles, but you would get less calculations per second. And this was my question: which is used?

Furthermore, you could accomplish it by using a different instructionset (but I don't know if this technique is commonly used in practise).


Jörg

[GuchiGuh]

the phone "cpu" has to do more than just decode mp3s
I dont think that mobiles can change the clock speed of their CPU My knowledge here runs out, too~

Eeek, look what we have done!!! Hijacked the thread! Sorry

(ish all your darn fault VJ ...jkz )

[chaoliang]

Nokia has very good menu and battery, at least my ultra old 6210 is so. It's over 2 years old and still works very well.
The battery of my GF's Siemens goes loose already after one year.
Battery life is very important.

[VJ]

Important for the battery is the type of battery: NiMH is the worst, Li-Ion is better, Li-Pol is currently the best.

My father has a Nokia 3110 (or something like that, you know, that popular model), at I feel the batterylife is appalling (and it doesn't charge fast). Mine has a Li-Ion battery, and the batterylife is much better (even when it was 3 year old, it still outperformed the brandnew NiMH Nokia).


Jörg

[Wombat]

Originally posted by VJ
So for a lower bitrate, the processor is clocked at a lower speed? Or are there simply more idle cycles?

Gucchi: I do trust you, I merely was curious as to what technical change was made to acchieve this.


Jörg

Probably more idle cycles. AMD's PowerNow and Transmeta's chips are the only ones I can think of off the top of my head that do dynamic clocking.

A well-designed chip can have a <I>very</I> low-power idle.

[az]

Intel's XScale can do dynamic clocking (to an extent), too, and I think many embedded chips can.

AZ

[Wombat]

Yes. I said dynamic clocking when I meant self-clocking. The Xscale's processor speed can be controlled by software. And it can selectively power blocks.

[az]

It must really be controlled by software? Bah!

AZ

[VJ]

Wombat: Thanks!

Az: Sorry about hijacking the thread... I did try to get it back on track with my battery-information posting thingy...



Jörg

[az]

NP; I think my decision is err.. decided

AZ

[Goc]

So? Spit it out!

[az]

I think it's going to be the K700i.. now the decision is only to buy or not to buy

AZ

[GuchiGuh]

Resistance is futile az.......you will be consumed......join the dark side.....release your soul............

Bah, go for it! It's not like you spoil yourself everyday! Go have some fun with that awesome phone!