Ray, you are way way way off buddy but I see how you arrived at your
conclusion. Not a bad guess.
The hissing is coil noise. Let me expand on that for folks not familiar.
Coil noise is a generic electronics term for the sounds that circuits can make
from electrical resonance. When an electric current passes through an
electronic component it can cause that component to vibrate. The vibration
will grow louder as more current passes through the circuits. It doesn’t have
to be a coil though, any electronic circuit has the potential to resonate. A
good example of one you’re all familiar with is the 60 cycle hum that
transformers make. Just hold your power adapter to your ear and you’ll hear
that buzz, that’s coil noise.
In the specific case of some iPhone 7 and 7+ models some folks hear a
hiss or high frequency buzz emanating from the area behind the apple on the
back of the phone. Hold the apple to your ear if your phone is one doing this
and you’ll hear the hiss at it’s loudest. What’s right behind the apple? The
A10 processor. There’s also a voltage regulator right in that area. It’s said
that the hiss is the loudest when the phone is under load (heavy computational
load like a restore, booting, running a ton of apps, etc). This is because
more power is pushed through the silicon in the A10 and it actually has a
resonant frequency in our audio spectrum. Now, the phones have damping
materials in them. THere’s a little drop of glue in there that dampens the
vibration. On some phones it’s thought this glue dried out or not enough was
applied. Less dampening material = louder resonance or buzz. Think of a
tuning fork, if you ring the fork it resonates and vibrates. If you take your
hand and grab the end of the fork the note will stop because your hand dampens
the vibrations. Same with the glue. Bottom line, it’s harmless. Not all
phones have this. I won’t even call it a problem as it’s not. Apple will
however swap out your phone if it’s to loud. My phone is not doing this but
there are examples on line if you want to try to hear the effect.
Hope that clears it up.
Thanks
Scott
> On Sep 19, 2016, at 10:26 PM, Ray Foret jr <rforet7...@comcast.net> wrote:
>
> By now, I’m quite sure all y’all have heard of the latest with the iPhone7+.
> It hisses at you when you push the unit very hard: that is, according to
> some. After considering the matter, I have come to the conclusion that I
> think I know what is or may be going on. I tried this with my iPhone6+ and
> got results that seem to confirm it. Yes, I heard a hiss, but, I do not
> believe it’s a problem with the phone. My explanation is this. If there is
> a so-called “hiss” going on, it’s got to do with the distortion of air
> movement as it passes between the opening of your ear and the smooth flat
> back of your phone. Consider what happens when you put a sea shell to your
> ear. You hear what you were told as a child is the sound of the ocean: but
> actually, it’s nothing more than the distortion of air as it passes between
> the opening of the shell and the opening of your ear. Just as light refracts
> around objects causing shadows, so sound can refract in much the same way.
> The poor sighted, who may not be used to this femoninon, are confused and
> believe their iPhone7+’s hiss at them when the processers are pushed hard.
> What say the rest of y’all concerning this explanation? Remember, the
> so-called bend Gate was dismissed after a while when it was proven not to be
> so? I rather expect that this so-called “hiss gate” will go much the same
> way. Yes, I have seen the youtube video and heard what sounded like a hiss:
> but, I am convenced that what I heard was ambiant room noise.
>
>
> Sent from my Mac, The only computer with full accessibility for the blind
> built-in
>
> Sincerely, The Constantly Barefooted Ray
> Still a very happy Mac, Verizon Wireless iPhone6+ and Apple TV user!!!!!
>
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