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Audio: How We Hear

amirm

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#1
Our resident technical and psychoacoustic expert and research/industry luminary, @j_j, recently gave a talk at our local chapter of Audio Engineering Society. He calls it Hearing 099. I tried to make it more descriptive and hence what is in the title. It is not very accurate but hopefully it is enough to get your attention. :)

I should tell you in advance that JJ's talk is a mix of very simple and useful information -- some summarized in just one sentence -- and others which will be complex and probably hard to understand for most of you. The simple messages are spread throughout the presentation so please set aside an hour and listen to it. And don't skip the last 5 minutes, whatever you do.


The talk will be the start of your understanding of our hearing system and likely something you will come back to often. It will also be a jumping point to learn more using other online resources. It is the best presentation I have seen as the topic is often described at too high level, or way too low.

Hopefully JJ will be available to answer questions as he did from the audience.
 

anmpr1

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#2
Anecdotally, I've found that my hearing acuity fluctuates depending upon (as far as I can tell) atmospheric pressure. Sometimes things are very clear, and other times muffled. I correlate it with the weather. Obviously the 'what' of the hearing has not changed. It's most likely an inner ear thing. On another note, I've been going over some ABX analysis, and some studies report that in upwards of a third of the cases, people report hearing 'differences' when the same component is compared with itself.
 

RayDunzl

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#3
Anecdotally, I've found that my hearing acuity fluctuates depending upon (as far as I can tell) atmospheric pressure. Sometimes things are very clear, and other times muffled. I correlate it with the weather.
I notice the same occasionally. I'll agree with air pressure difference on the "eardrum".

Carefully adding (equalizing) pressure on the inside makes things right again. It creeps up on me, don't know the physics of the pressure differential. Maybe gas in the inner ear is slowly absorbed into the tissues, and if the eustacean tube is stuffy, you have to gently force equalization.

Maybe it is a barometric pressure change (and stuffy eustachian). I'll note the mercury barometer next time I feel it happen to me. 29.9 inches right now, hearing feels normal to me at the moment.
 

rmo

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#4
Anecdotally, I've found that my hearing acuity fluctuates depending upon (as far as I can tell) atmospheric pressure. Sometimes things are very clear, and other times muffled. I correlate it with the weather. Obviously the 'what' of the hearing has not changed. It's most likely an inner ear thing. On another note, I've been going over some ABX analysis, and some studies report that in upwards of a third of the cases, people report hearing 'differences' when the same component is compared with itself.
Atmospheric pressure and humidity levels as well . Nicely said and very true
 

Sal1950

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#5
Carefully adding (equalizing) pressure on the inside makes things right again. It creeps up on me, don't know the physics of the pressure differential. Maybe gas in the inner ear is slowly absorbed into the tissues, and if the eustacean tube is stuffy, you have to gently force equalization.
You have to inhale deeply, hold it as long as possible, then exhale slowly.
Works to eq inner ear pressure just right. ;)
 

JJB70

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#6
I can see a splendid opportunity for the next big leap forward for audiophiles here, audiophile grade diving decompression chambers.
 

Blumlein 88

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#7
Very nice talk. Glad this was put up. Plenty of interesting points scattered through out. I hope there are parts 2 and 3.
 
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Jimster480

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#8
I've been meaning to set aside an hour to watch this. Just haven't been able to yet.
It looks very interesting. I'm sure as @amirm said that some of it will go over my head... but that is fine. I'm always trying to learn new things.
 
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#9
Highly recommended. Lots of good information, and some of the most interesting stuff comes in short sentences in between.

But it does not come easy, a solid technical background makes it possible to get more out of it. I watched it 2 times, and occasionally paused the video, to think over.

More focus on how hearing works and less on optimization of non-existing problems has been the key for getting results that matter, for me. This is where the progress will be in future audio.
 

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