I haven't flown for many years; but I think I remember airline headphones that were connected to the seat-handle with a hollow plastic tube.
They were awful.
How do MRI Headphones work? (2022)
31–40 of 200 posts
Re: How do MRI Headphones work? (2022)
#32Completely tangential story. A few months back I was getting an MRI. I stashed my belt, coins, keys, and phone. The machine started its clicking and thumping when I realized I had my wedding band on my ring finger. Immediately my mind raced to a video I once saw of an MRI machine propelling a fire extinguisher across the room. I braced for my finger to be torn off while I slowly took the wedding band off using only o…
If it was ferromagnetic you would likely feel it tugging as you got close to the magnet. Gold, silver, titanium are ok in MRI. However, next time, the second you realize you have metal on your person you should immediately inform the techs rather than try to just hold onto it! Aside from the risk of injury, it can be a real pain to get stuck items off the machine.
Re: How do MRI Headphones work? (2022)
#33So they work like a stethoscope.
Would they sound better if they used a liquid instead of air for the conduction?
Re: How do MRI Headphones work? (2022)
#34Earlier quoted context omitted.
Interesting how different people's minds are. I find the exact opposite problem, I go with old faithful over new. It's for this reason that when I put my clothes away I simply take the stack of clothes in my dresser out, put all the fresh stuff on the bottom, then put the clothes that were in the drawer stuff on top. I always grab the top sweater, t-shirt socks etc and I don't think about it at all.
FILO is not the standard method of maintaining one's stock of clothes? How else does a person mange wear leveling?
You shouldn't. If you successfully manage wear leveling all you've done is make sure you have to replace your whole stock at the same time, as well as depriving yourself of regular reminders of what new-ish clothes should look and feel like, leading you to keep wearing worn-out clothes.
Re: How do MRI Headphones work? (2022)
#35Earlier quoted context omitted.
Interesting how different people's minds are. I find the exact opposite problem, I go with old faithful over new. It's for this reason that when I put my clothes away I simply take the stack of clothes in my dresser out, put all the fresh stuff on the bottom, then put the clothes that were in the drawer stuff on top. I always grab the top sweater, t-shirt socks etc and I don't think about it at all.
FILO is not the standard method of maintaining one's stock of clothes? How else does a person mange wear leveling?
My process:
1. Buy ~15 copies of everything.
2. Not think about what to wear! Everything is roughly the same.
3. Throw out everything every ~3 years. A couple of months before that, start buying new models of clothes to find the best one.
4. Goto 1.
Re: How do MRI Headphones work? (2022)
#36Earlier quoted context omitted.
I've been on an airplane that used these! I think it even had a channel selector near the plug if I remember correctly (it's been a while).
EDIT i'm wrong the speaker was inside the armrest. I wouldn't be surprised if the channel selector wheel was a simple mechanical acoustic coupler rotating to connect or cap upstream source tubes. I remember it as well flying in the late 80s or early 90s.
> a simple mechanical acoustic coupler
I get what you're saying, and I think that's plausible. But as far as I'm concerned, an acoustic coupler is/was a type of modem, into which you plugged an ordinary telephone handset. You had to have a telephone that had hemispherical mike and earphone; it didn't work with e.g. a trimphone. Expected performance: 9,600 bits-per-second.
Re: How do MRI Headphones work? (2022)
#37>The only headphone tech that I was aware of or that I'd ever really considered I guess I'm old now because this style of headphone was present on every model of passenger aircraft in the sky when I was a young adult.
I've never heard this before! When I started flying it was just the 2 mono jacks that you still see on planes that haven't been updated (always wondered why it wasn't just a stereo jack)
Pretty surprising to hear there's air/sound tubes rigged on to every seat on a plane.
Seems like the sound tubes ended in the 70's: https://apex.aero/articles/sound-tube-surprising-history-air...
Re: How do MRI Headphones work? (2022)
#38Earlier quoted context omitted.
EDIT i'm wrong the speaker was inside the armrest. I wouldn't be surprised if the channel selector wheel was a simple mechanical acoustic coupler rotating to connect or cap upstream source tubes. I remember it as well flying in the late 80s or early 90s.
> a simple mechanical acoustic coupler I get what you're saying, and I think that's plausible. But as far as I'm concerned, an acoustic coupler is/was a type of modem, into which you plugged an ordinary telephone handset. You had to have a telephone that had hemispherical mike and earphone; it didn't work with e.g. a trimphone. Expected performance: 9,600 bits-per-second.
"coupling" then, whatevs.
lemme see if I can dig up a patent number for the channel switcher wheel and put this pondering to rest.
seems the inventing corporation is still around haha
https://avidproducts.com/2023/12/08/celebrating-70-years-of-...
Re: How do MRI Headphones work? (2022)
#39I made the mistake of brining an episode of 99% Invisible to an MRI. The sound quality is so bad that you barely can't make out voices. It was excruciating to listen to something I could almost understand for that time.
Re: How do MRI Headphones work? (2022)
#40So they work like a stethoscope. Would they sound better if they used a liquid instead of air for the conduction?
Probably not, recall how sounds sound underwater, they do not sound like they do above it.