Quote:
Originally Posted by Sweetpea
I'm certain my ebook is off when I don't turn a page... I think it wastes more energy to keep turning it on and off than it is to lock the keyboard.
Because a phone is a phone and a camera is a camera. Also, even when my work phone is on flight modus, it does interfere with my sound system. I never heard that camera make any interference with my sound system...
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I really doubt that any device is off when not turning a page, the biggest evidence is the page turn rate. I think they are in a deep sleep mode, but one that will respond in a very short time, but it is still responsive to interrupts etc.
If it was truly off, each page turn would require the boot time, the book load time, and then the page display time, not the page time. Even if it was at a very low power state (main ASSP off, DDR in self refresh, small uC listening for interrupts to wake everything up), the page turn rate would be too much for most people. In general, the main ASSP will be powered, clocks to unneeded systems might be shut down (depends on the ASSP vendor), CPU clock may be stopped/stalled (ARM is very good in this regard), and the DDR subsystem will be up and running. This allows for a fairly quick page turn, while getting by on a small amount of power.
Your camera is like any other digital device, when it is on, and especially when you are taking pictures, it can easily leak EM interference, no different from the flight crew passing and you turning on a netbook (generally the same basic subsystem in the two). The processors, memory, display systems are very similar between a camera/netbook/PDA/ebook/cell phone.
--Carl
definitions:
ASSP -- Application Specific Standard Product
DDR -- Dual Data Rate RAM
uC -- microcontroller