Re:Google Pixel 2 and 2 XL announced
by WillPostForFood on Wednesday October 04, 2017 @04:59PM
(#15404597)
AUX has to send electricity down the wire to drive the speakers in headphones. The Quora article you link to is weirdly written but confirms this, "the signal is from your phone and your phone uses it's battery to make it." I.e., headphones work by taking electricity from your phone and converting it to sound.
The Quora article also mentions car audio. In a car, Bluetooth uses more power than a 3.5 mm cable plugged into an AUX port on the head unit.
Re:Google Pixel 2 and 2 XL announced
by WillPostForFood on Wednesday October 04, 2017 @05:30PM
(#15404881)
Yes, it is saying the car uses more power for the bluetooth connection, than receiving the AUX in from the phone. Not that the phone uses less power.
What on earth do you need a scientific study on? There are speakers in the headphones that produce audio. Where do you think the power for that comes from?
https://www.quora.com/Which-uses-less-battery-for-a-car-audi...
It's hardly a scientific study, but it reinforces my prior belief that aux doesn't inherently require any electricity, while bluetooth is sending information over radio waves which of course has to use electricity.
I'm not sure about the difference when it comes to fancy, high-powered headphones, but my (anecdotal) experience with bluetooth vs. analog certainly supports the idea that bluetooth uses more power. I'd appreciate some citations if you have some other information about this subject.