Boyle-Marriott pV=nRT. The temperature increases inside, as consequence the pressure increases and as this model is fully sealed with waterproof gaskets, the air "fights" for going out. (At least it sounds like that for me)
Ouch. Seems like no one here has been around long enough to recognize this. It's the clock of the processor you're hearing through some sort of electromagnetic coupling to the enclosure. In this case it must a beat frequency that is within the audible range. I remember being able to tell by ear which part of a program a CPU was in. Different loops made different noises.
Ouch. Seems like no one here has been around long enough to recognize this. It's the clock of the processor you're hearing through some sort of electromagnetic coupling to the enclosure. In this case it must a beat frequency that is within the audible range. I remember being able to tell by ear which part of a program a CPU was in. Different loops made different noises.
This would've been my guess too. The iPhone isn't actually hermetically sealed around the speaker and the microphone. It has a series of meshes that have holes which are small enough so that the water surface tension isn't broken and it can't flood these areas. Besides, there's not enough air inside the phone that would enable hot and expanding air to make a noise that's this consistent and long lasting. It's interference.
I guess time will tell what kind of interference it is exactly.
I'm guessing, heat under high load heats air quick, air takes more volume, escapes through a tiny hole (see balloon).
And what temperatures are you expecting that iPhone to be warmed up to in order to produce that effect? 200F, 400F? How much time should it take to get to that t? .1 second?
(sigh)
I am pretty sure that thermal capacity of the phone will not allow that to happen.
It will take much more time to get it to the needed temperature, than for that air to escape. In other words - no, that is unlikely that this hissing sound is from escaping air.
By the way, my internet provider sent me a router that hisses exactly like that. I am curious if people who spotted that "hiss", were sitting next to some crappy e-device that did that. I don't think Apple would allow that type of crappy engineering to pass their tests...
Could be load-pull from the processor causing the "quiet, stable" audio reference ground voltage to fluctuate when the application processor is running at full capacity. Or electrostriction of capacitors causing the logic board to vibrate at an audible frequency. The old RAZR V3's used to have the latter problem with their displays—a perfect combination of display resolution, panel size, lens air gap, and frame refresh rate caused them to resonate at an audible frequency.
Ouch. Seems like no one here has been around long enough to recognize this. It's the clock of the processor you're hearing through some sort of electromagnetic coupling to the enclosure. In this case it must a beat frequency that is within the audible range. I remember being able to tell by ear which part of a program a CPU was in. Different loops made different noises.
This kind of thing happens with my computer monitor. When the screen is mostly white, I can hear some kind of high pitch noise, but it isn't present when it's mostly dark. Like I replaced the sound card and still hear it, so I know it's not coming from the desktop.
Also to note, I actually hear high pitch noises that my parents can't hear.
Ouch. Seems like no one here has been around long enough to recognize this. It's the clock of the processor you're hearing through some sort of electromagnetic coupling to the enclosure. In this case it must a beat frequency that is within the audible range. I remember being able to tell by ear which part of a program a CPU was in. Different loops made different noises.
This kind of thing happens with my computer monitor. When the screen is mostly white, I can hear some kind of high pitch noise, but it isn't present when it's mostly dark. Like I replaced the sound card and still hear it, so I know it's not coming from the desktop.
Also to note, I actually hear high pitch noises that my parents can't hear.
some TVs do this as well -- whiter screens with a high pitched whine. my plasma does, read users discussing it on a forum.
My MacBook Pro 5,5 whines too. The noises change in response to CPU and GPU usage. When sleeping, the power supply whines as the sleep LED goes dark and quiets a bit as it lights up.
Comments
I guess time will tell what kind of interference it is exactly.
"You're tasking it wrong."
Is it an electrical hiss, an acoustical (speaker) hiss, or a boiling hiss?
Trussst in me.
Jussst in me.
Shut your eyes and trussst in me.
Also to note, I actually hear high pitch noises that my parents can't hear.
Playing Clash Royale makes it hiss every single time.