A Submarine Sonar Strapped To Your Head

[@thethoughtemporium]

First 50 people to use this link or the code manbat, will get an additional 10% off on the merch! thethoughtemporium.ca/discount/manbat

[@Meg_A_Byte]

That might be one of the best discount codes ever :D

[@tiporari]

😢 I couldn't hear 19 or 18 kHz. 41yo. Musician. Dang it lol Excellent idea, project and execution. Thanks for sharing

[@thorwaldjohanson2526]

This could be really cool for blind people. I think if it is not modulated to the audible range, but instead just above and then uses noise canceling headphones, which are in transparent mode and use some software to downshift the signal to the audible range. This way, other people don't get disturbed and there is probably things that can be done to improve the experience, like amplifying low signals.

[@Romulus00001]

i've been able to hear bats all my life, and only now i just realized. the sound isn't pointing towards the bat, i hear it more like it knocks inside my brain. i'm not hearing the bat, the fucking bat is looking at me! :D

[@gwydionrusso3206]

Apparently there’s some blind guy (I can’t remember his name unfortunately) I believe he’s from England that learned how to echo locate.

[@nate_0723]

"Older viewers may not be able to hear this" "Ha, sucks for them" *hears nothing* "Oh"

[@stop_bringing_me_up_in_goo167]

Literally tho 😢

[@TNTsquid.]

Same, Im only 20 did I mess up my ears or?

[@Jaevwyn]

Also some, though I am 30

[@loganpreskar9209]

I’m 18 and could not hear either 😢

[@darkairieal]

probably has to due with bad headphones or speakers - If they can't output up to 18k or 19k then you wouldn't be able to hear it. Cheap headphones will say 20hz-20,000hz but not actually output the top end or low end

[@kruszielski]

Hello! I have a Ph.D in psychoacoustics, and my research was in perception of space and the interaction between sound and vision senses. The effect that you studied here is an actual technique used by blind people to echolocate, by emitting click sound with their mouths or other objects, and require extensive training. The most famous case was a boy called Ben Underwood, that was able not only to walk without a cane, but do very extraordinary thing, like actually play basketball (and hit the score easily) or walk with his bicycle without any assistance. An MRI while doing this technique showed that he used to process echolocation the same area in the brain that non blind people use for vision. That means that he actually could see throught sound.

[@Erhannis]

Oh hey, somebody who officially knows what they're talking about, neat. Also, I did briefly try learning that technique for fun, but didn't practice enough to get good at it. The "blade pop" tongue click is a handy loud noise I can make now, though.

[@ooqui]

I've learned active imaging echolocation in the Daniel Kish style, i.e. "click sonar", and though it took me a few months I actually managed to link the two senses, sound and sight. When I click my tongue I actually see the world around me; if I really focus I see it sometimes even in ("false") color. Not in the same sense as in normal vision, because there's a lot less and different detail in sound, but I can navigate pretty well in rooms, forests, etc. with only clock sonar. I think that it's easier for a sighted person to learn active imaging echolocation, because you already know how the world "should" (or could) visually look like. You just have to train your echolocation until the "imagining" you've previously done actively becomes automatic.

[@tomy34188]

@@ooquiThat sounds so crazy it’s almost hard to believe. Why would you want to learn this skill as a sighted person, though, considering how difficult it is supposed to be? Doesn’t seem very practical compared to just seeing. But maybe I’m just narrow minded or I fail to „see“ the usecases of such skill.

[@ASpaceOstrich]

@@Erhannis How do you do it?

[@Aikano9]

@@tomy34188walking in the dark or at night without a flashlight?

[@davidmende3409]

the effectiveness is even higher than you think - when you realize that he ran after the cameraman for half the time without being told, so he pretty accurately found the 3 targets

[@JS10K]

Great point. I didn't even realize that at first because the camera man also moved around which confused him what he was hearing as well as seeing from the cameraman POV has me inherently forgetting there is a person behind the camera.

[@someirishkid9241]

@@JS10KI found that hilarious, the cameraman was unintentionally gaslighting him into thinking it wasn't working.

[@ui264]

This post needs more traction. That was the best piece of evidence it could have been! He was chasing the camera very well without even realizing it.

[@DigitalJedi]

And that was a moving target as well. Presumably the cameraman made some small sounds with his footsteps, but even so, that is very impressive for what would have only been a few minutes of using the device.

[@sytritewarum5720]

Honestly, I found it hilarious how he was just chasing the cameraman around and no one bothered to let him know...

[@Nav203]

Bats : "look what they have to do to gain a fraction of our power"

[@WeAreInYourWall]

Gets trapped in room with open bay window and sliding double doors.

[@dirkvantroyen9170]

They wouldn't say look hehe

[@leopoldomolina1763]

We built up this device in 1996 as a project for high school graduation in Venezuela. It was amazing. I remember that we did a live demo in front of an audience. We used the same principle of echolocation and thus we named our electronic device "Ecolocador", or Ecolocator in English. Our device was very simple with only a couple of ultrasound transducers mounted on glasses, no stereo capabilities, The blind people that were willing to test it were amazed and asked us if we were going to manufacture it in mass, unfortunately we didn't go forward and it was just a high school project However, we gain a science recognition award in a regional high school contest for our invention

[@maxim_ml]

so, worked well for blind people? what sound did you use?

[@Granochereal]

😮😮

[@chickenbot1]

My takeaway from this video is: If I want to avoid being detected by a bat, I should dress up as a Lockheed F-117 Nighthawk attack aircraft.

[@Eis_]

I now identify as a Supercruise capable,All-weather Air Superiority Fighter Lockheed Martin F-22 Raptor.

[@artsyscrub3226]

@@Eis_ And i assume your mortal enemy is bats?

[@anonymousapproximation8549]

​@@artsyscrub3226 no, just commies.

[@polo3292]

​@@Eis_prove it

[@vast634]

@@artsyscrub3226 is it a man or a bat?

[@microwave221]

If you have any friends who are firefighters, give them a whirl on the helmet and see if they get a grasp of it faster. We get extensive training on how to keep our bearings in rooms without any visual input because smoke often manifests a total blackout, and your experiment felt so much like a search drill. It might be interesting to see what it's like when someone uses it that already has an existing framework to build off of

[@JudgeConviction]

I wonder if the smoke in that situation would make the sound beam scatter eratically? Think turning your brights on in thick fog

[@sariourlecai1561]

@@JudgeConviction the idea isn’t to have them in a smoky situation, just use their training in those situations to see if they can utilize it better than the average joe

[@MissBlackMetal]

​@@sariourlecai1561 what would be the point of that experiment, though? Just to prove that people who have decent training in completing blinded tasks will make better use of the echolocation helmet? Isn't that a given? 🤔 At least with testing using blind people, the echolocation helmet can then be used by them, assuming it works well for them. But if firefighters can't use it in their relevant situations (i.e. smokey fire rescues) then what's the point?

[@reynaldo4657]

@@MissBlackMetal "people who have decent training in completing blinded tasks will make better use of the echolocation helmet" exactly the point for the usecase of firefighters

[@griffinmckenzie7203]

​@@MissBlackMetal Bro thinks every experiment *needs* to have a detailed and productive reason. Lmfao

[@KevinLarsson42]

15:46 Yes! It might also be interesting to compare a person who has had blindness from birth, versus a person who became blind later in life.

[@davidmende3409]

oh i'd love to see how they respond to it - and how their exp differs

[@FLPhotoCatcher]

I've always had good ears, so about 20 years ago I thought-up the idea of using a high-pitch sound emitter that blind people can use to echo-locate. A few years later, I saw that a human was doing it, but using clicks he made himself.

[@AdmiralThumbs]

Yeah, for the person blind since birth, you should Collab with Tommy Edison.

[@johan-mattias]

duh

[@AdmiralThumbs]

Oh also, there's a blind guy (don't remember his name) who taught himself to echolocate using mouth clicks and is known for a relatively popular (perhaps even viral) video where he rides a bike at normal speeds using echolocation. Y'all should have him try the helmet out and see if he finds it helpful or whatnot.

[@mythicalbeast1202]

15:51 "There's a blind person staring at me..." "How can you tell?" "I can FEEL Miley Cyrus in my head..."

[@uIie]

Without this video as context this is completely gibberish

[@BlazingFalkor]

So your saying, the man used that as the sound, thats amazing

[@Ariamaki]

The cameraman deliberately running away and not participating really threw this entire thing off and made it seem far less effective than it actually ways. If you visually watch your reactions in the playback you can see the clear and obvious pauses when you realize you've hit something, but it's the camera guy and he just leaves, which messes it up.

[@plzletmebefrank]

Actually, I think it proves the point even more, at least if you're paying attention. Because he found the cameraman multiple times and kept chasing him, a moving target.

[@chimedemon]

@@plzletmebefrankthis right here, this actually proved to me more just how effective it truly is, like this was just the first try and already he could follow him a bit. Imagine actually practicing with this for a few months.

[@ekkekrosing8454]

0:33 a yes, the dark art of physics. Causing suffering and despair in all physics students

[@bloodlove93]

taught by professor grape who killed dumbo the dwarf.

[@FeeshUnofficial]

Sperm whales CAN if they try kill someone with sound alone. They're apparently known to be more careful when divers are nearby

[@bodyno3158]

aww

[@thepizzaguy8477]

aw. they whiper for their lil friends. Whales are too smart, i would love a source for this

[@FeeshUnofficial]

@@thepizzaguy8477 I can look into it. I heard it somewhere, hence the "apparently"

[@huehuehuehuehuehuehuehuehuehue]

apparent means clearly visible or obvious. you are looking for "reportedly"

[@FeeshUnofficial]

@@huehuehuehuehuehuehuehuehuehue don't get smart with me when you're so clearly wrong. Apparently: adverb. As far as one knows or can see.

[@UnironicScrotumhat]

14:29 goes for a high five, remembers he's blindfolded, pretends to fix hair. Classic.

[@bjarnes.4423]

Passed the "is Human" test

[@Litepaw]

"oh and he also asked who wants to go next and I already had my hand up, so I can pretend that's what I was trying to do the whole time. No one will ever know this dark secret" We do know.

[@smolapril]

why you gotta call him out like this 😭

[@johnsmith-000]

No big deal, Batman's lying all the time, too:)

[@mozkitolife5437]

I’m glad he’s just as awkward as I am.

[@morgan0]

9:30 a correction here. mixing pure tones perfectly linearly does not create new harmonics. however, nonlinear behavior either in the mixing stage or after they are mixed, will cause them to create intermodulation distortion, which makes subharmonics in addition to harmonics (which in a digital context would also alias and make it more audible, but in the real world or with pure math, would not be audible). the nonlinearity in this use case is the air itself, which acts to demodulate an amplitude modulated ultrasonic frequency.

[@klave8511]

Well said, this is the fundamental of a parametric system. The Audacity example confuses because mixing and adding is not the same in this case. An audio mixing desk is just adding signals. Parametric mixing multiplies signals by one means or another, as you said, air non-linearity does it here.

[@MatthijsvanDuin]

It looks like he's clipping the audio in his audacity example? (since all inputs being added are individually already close to 0 dBFS), which would also provide the non-linearity needed to produce intermodulation products

[@morgan0]

@@MatthijsvanDuin yes that is almost certainly why it became audible

[@RolandBanc]

Really hoped someone would point this out! Thank you all!

[@metern]

The camera guy is messing the sonar test by moving around. You can clearly see that in the first test. The guy is confused every time the camera guy moves away.

[@cyanwine6003]

I already know the only reason he’s not turning someone into a bat monster is because his lawyer said “no.”

[@3mileshi]

Lawyers are also immune to the echolocation

[@pattheplanter]

@@3mileshiDaredevil would be able to tell you were echolocating him, not sure about all lawyers.

[@memejeff]

CRISPR that carries genetically is illegal in canada without a permit.

[@pattheplanter]

@@memejeff What if you neuter your test subjects?

[@TechnologistAtWork]

No doubt about that.

[@tinkeringinthailand8147]

There are a few blind people who have "echo location" abilities by using vocal clicks, and actually see pictures in their head. The human brain is such an amazing organ.

[@Jon-cw8bb]

They are bullshitting

[@thebotanist7145]

​@@Jon-cw8bbMost likely.. I think they can probably detect something when it's near them but not perceive it as a 'picture'.

[@jocaleb0236]

@@Jon-cw8bbyea as far as I know it’s like if they are standing a foot away from a door, they could tell if it’s opened or closed Or they could reach out and touch it…. It’s neat that it could be done in the vaguest sense but it’s not very useful for them beyond the novelty

[@trels203]

When I first learned about this i closed my eyes and tried to navigate my house with clicks lol

[@herobrine1847]

@@jocaleb0236I’ve seen a video of this blind dude being able to skateboard around his suburban neighborhood (navigating around cars parked on the curb), people differentiating stuffed animals vs inflatable animals, and other cool stuff all with clicking. I’m sure there’s varying levels to it.

[@supreetsahu1964]

Please, that could be a great tool. Especially if the clicks are also inaudible by increasing the frequency further- and the person using it also has a device in ear that can detect that ultrasound.

[@jordanthomson1572]

That’s a great idea! Having something that makes an annoying clicking sound all the time may not be ideal, but if it comes with a way to make the sound only audible to the user, that could work great!

[@gabrielaziez202]

​@@jordanthomson1572Then bat, dolphin and the likes. Could hear them, not only the user

[@jordanthomson1572]

@@gabrielaziez202 True, but would that be a problem? Dolphins generally don't inhabit the same habitat as people. Bats sometimes do, but bats are also able to navigate even when there's other bats nearby, so unless this machine is MUCH louder than bats (and bats are very loud), I don't think it should be a problem. One possible issue could be the other way around, where the person using the device would hear bat clicks too. It might mean that the device can't be used effectively when bats are flying nearby, or it might just need a filter in the software to ensure it only translates the intended signal, and anything else gets ignored.

[@АндрейТокарев-р2ч]

@@jordanthomson1572 this could be solved easily by making frequency amplifier headphones (or earplugs). Yep, a person with the same frequency would "see" you, but as long as you just switch channels, this might work. Like a portable radio frequences pool from 20000Hz to 21000Hz. So, for example, emitters would emit different Herz inaudible waves, by amplifier you would hear familiar sound, everyone happy.

[@LoisoPondohva]

​​@@АндрейТокарев-р2ч it's probably better to go higher than 20-21khz. Children can hear at that range and their annoyance is not of lower value than that of older people, and dogs REALLY cam hear them, and their annoyance cam be dangerous. Especially since going higher makes the beam more focused and presumably more useful/precise.

[@memetech-]

13:14 echolocated the cameraman

[@mitchellcarlton-wl8oo]

You should put this in a museum for people to have fun with.

[@MrBainus]

I have a feeling that the dance studio was actually making things harder than they needed to be. A room with flat walls everywhere will cause a bunch of echos, making it harder to place where the original sound is coming from. Probably an open field (maybe out in the snow, because it absorbs echos) would work even better!

[@АндрейТокарев-р2ч]

whenever you try to orient by a sound emitting "laser" focused cone of those soundwaves, you could actually just ditch the noises that repeat eachother by distance. Its easier than you might think.

[@steamsteam-xm6om]

1:32 Decibels in water are not same as Decibels in air. I think you should have clarified that. A different reference is used in water

[@Jakaj99]

That's very useful remark, I didn't know it and was a little bit sceptical/surprised by 230db

[@the_undead]

Technically true, but there are a lot of air pockets in your body which make his statements mostly correct

[@pattheplanter]

Decidivingbels?

[@dr.blockcraft6633]

To convert It, you Subtract 26 From the Underwater measurement. 230-26= 204 230 decibels In water, Is 204 decibels In Air.

[@Ebani]

​@@the_undead Where are those air pockets? 🤔

[@GHar94]

Similar reason Navy divers and other personnel have to be out of the water before SONAR can be used, the sweep of sonar acoustics will kill you in an awful way.

[@GHar94]

And yes, it has also caused marine wildlife to die.

[@Linuxpunk81]

I am a retired submarine sonar tech and I can still recite the divers working over the side warning that topside would have to say over the 1mc every half hour 😂

[@POTATOEMPN]

I got to read one of the released like death information? About some of the people who had been killed by the sonar. It is very gruesome. I won't even bother trying to describe it because it feels kind of disrespectful to do anything other than to warn people away from swimming anywhere underwater near Wales and military stuff. Not that you could really ever get that far normally, but still

[@FerociousPancake888]

There have been incidents with people literally hundreds of miles away being injured by sonar. That stuff is LOUD.

[@Melvin420x12]

Did they find out before or after awfully killing their collegeas testing the first SONAR?

[@johnsmith-000]

Great project. It reminded me of my friend, who was full time inventor, I mean he had been living of his patents and products. And once he got an idea to try to make glasses for his blind friend to help him "see" the objects. Because it was more than 40 years ago, instead of just picking an ultrasound distance sensor, he used the focusing element from video camera and installed it a the front of the glasses, and converted its signal to the vibrations in the temples (arms). I wasn't present when they were testing it, but my friend said that the blind guy after two days could pick up a needle from the table. So I totally agree we're capable of much more than we know, one just needs to stumble upon the right idea. Yours might probably also help blind people finding they way around, with some modifications, or miniaturization at least. Their senses are more honed than in average people anyway. Oh, and thanks for the 18 and 19 kHz samples. I also have Audacity installed, but it never crossed my mind to test my hearing. Now I know I can sell my speakers which are occupying almost half of my room and buy a much more compact hearing aid:) Maybe they also have a 12kHz version of FL studio LOL.

[@tabcaps5819]

14:34 Chasing the camera man

[@TruckeeLynch]

Stealth aircraft’s do bounce radio waves to avoid detection, which does account for their strange look, but complex curves could do this as well… the reason why older ones are faceted is because computer simulations were not advanced enough during their development. You’re looking at a low poly render irl!

[@gluk134]

I'm still waiting for neurons playing doom...

[@nikkiofthevalley]

It'll take a while. That is a very complex thing to do. Even a much more well-funded lab would probably still take years to get that working.

[@Rippertear]

Go play doom then. You have neurons

[@SophiaWoessner]

@@Rippertear no I dont

[@Rippertear]

@@SophiaWoessner Oh ok sorry

[@the_undead]

​@@RippertearThat is a very bold assumption to make

[@haifutter4166]

15:39 XD You know: Some bugs scream back when targetet by a bat to communicate, that they taste very very bad and pursuit isn't worth it.

[@mizu_retaw]

@@POTATOEMPN It was a joke.

[@defenestrated23]

​@@mizu_retawnot a joke. "Acoustic Aposematism and Evasive Action in Select Chemically Defended Arctiine (Lepidoptera: Erebidae) Species" Bats actively avoid toxic moths that produce certain sounds.

[@iAmTaki]

@@POTATOEMPN LMAO

[@haifutter4166]

@@mizu_retaw Well, actually that was a serious hypothesis in a research paper I read many years ago. Guess it was an april fools joke and I only got it know.

[@haifutter4166]

@@POTATOEMPN Thanks for the clarification.

[@yoavravid7893]

For those who couldn't hear the high frequency notes, they sounded like a headphone port that isn't connected well

[@Anon-i2z]

Bro how dafuck are we deaf people suposed to know

[@yoavravid7893]

@Anon-i2z there is no point in describing sound to deaf people...

[@atlas4733]

i'm 19 and my high khz privileges are already gone!

[@asoggyflipflop]

17 🙁

[@REL10000]

14 over here. Also can't hear them.

[@Надежда-ы6ф4й]

Its your speakers

[@Kitsune2Megafan1086]

You need an doctor to actually know, not a youtube video.

[@REL10000]

@@atlas4733 turns outs it speakers

[@0dWHOHWb0]

I know this has probably already been commented by now, but the whole "blind people using sound to echolocate" is already a thing There was a news story that made the rounds a few years ago about people learning to navigate with clicking sounds of some sort

[@Edge-wx7hv]

if I recall correctly, some people use like, a handheld clicker to provide the ping, but I was curious if anyone could learn how to do it, and from my experience I recommend just using your own mouth to generate the click. the fact your voice sounds different to you is useful for letting your instincts tell the outgoing and incoming sound apart, and it also means the sound source is always in the same place relative to your ears, so your brain doesn't have to account for the ping being in a different place each time or figure out how to tell two very similar sounds happening nearly simultaneously apart from each other. also you can just do it whenever, which makes it easier to practice, and once you start being able to get signal returns you understand, you can easily adjust the pitch and even angle the sound a bit to adapt to different weather or noise conditions. The biggest advantage of learning how to do it is that your passive ability to tell where noise is coming from practically *doubles* once you've got the trick down.

[@KevinLarsson42]

But this device creates a narrow "search cone", while human clicks I pressume have a wider "search cone", so it's a bit different. It should still be interesting how well a blind person uses this device.

[@0dWHOHWb0]

I'd argue that wider is better if you have the processing power to sift through the information, and it seems like we do since people can seemingly navigate with those clicks

[@IonOtter]

His name is Daniel Kish. He had to have his eyes removed at 13 months due to cancer, and completely on his own, he developed human echolocation. He is the first totally blind person to be a legally Certified Orientation and Mobility Specialist (COMS) and to hold a National Blindness Professional Certification (NOMC). He also holds master's degrees in developmental psychology and special education from University of California Riverside. He now teaches blind people how to develop their own form of echolocation. The..."resolution"...that he is able to achieve is truly astounding.

[@stevengill1736]

​@@IonOtter That's very cool! I wondered what happened to him....

[@abdullahunal1108]

12:09 the cameraman messed up the echolocation. The "bat" knew there is something in front of him but the cameraman kept moving, causing confusion.

[@blinkrogue1344]

Honestly that was a perfect scene as a horror movie.

[@greenmario3011]

Calling an ultrasound transducer "not a speaker" just feels mean. An IR flashlight is still a flashlight.

[@uglytrapgod]

But for the light to ‘flash’ a human has to perceive it. So calling it an IR emitter would be more accurate don’t you think?

[@thiesenf]

We're all recievers of everything... but our bodies can't use most of that energy in a meaningfull way...

[@pattheplanter]

Not speech, perhaps a dogwhistler?

[@omegahaxors9-11]

I mean it's not doing much speaking, it has a fear of crowds.

[@koghs]

Speech is perceivable by humans. Ultrasound entire definition is that it's not. Therefore, it's a not-speaker.

[@gringusgaming]

Did you shoot freaking bad apple at the camera at 9:55

[@aynohalopesdealmeida9932]

Bad Apple but is echolocation

[@zackdude4123]

TO ANYONE WHO THINKS THEY’RE DEAF, YOU PROBABLY ARENT, HERE’S WHY: If you have an iphone, there is a -6 dB drop off somewhere near 15kH, and it’s likely that it really fricks with the signal pretty hard. ALSO, nearly all speakers drop off significantly in this range, sometimes cutting off altogether before 18kH. Not hearing this is not anything like failing to hear the highest pitch piano note, it’s like not hearing a whispering fart underneath a pair of pants while wearing earmuffs at best. At worst it just isn’t even outputting the sound, which is what I tend to lean towards. If it makes you feel better, my studio grade headphones output to 28kH and my synth I used to test a sine wave (1 singular tone) went up to 20kH. I heard everything, and my headphones have a multiple dB drop at 20kH, still heard it. You not hearing the signals in this video mean pretty much nothing. Edit: I did not hear the signals at all in the youtube video, which baffled me because I knew for a fact I can hear those tones clearly. Edit edit: the youtube video probably does have the signals, I’m just saying it’s probably your speakers and something called “frequency response”. You can look up the unique kH range for whatever device you want by googling its frequency response range. That’s how I learned all of this that I shared, googled and tested it.

[@zelest]

I remember seeing something like this on "Project Cyborg", where Kevin Warwick did a series of experiments where he implanted himself with an array of electrodes to the nerves in his arm and then made an interface for it. One of the things he tested was having an ultra sound emitter/receiver and then being able to move around blindfolded in his lab after a bit of training. This was back in 1998, and I remember being so fascinated by this. I think there are still interview available here on youtube.

[@Spotifist]

I'm just here to see a cool gadget, didn't expect to get shot with the "You're Old" 😓 Learned some cool stuff in the process, so worth it in the end. Thanks for the video!

[@riffzifnab9254]

Your speakers might not reproduce higher frequencies, particularly phone speakers.

[@aftbit]

Don't feel bad. I'm only 32 and I couldn't hear 18k or 19k. I can only hear up to about 16500 reliably. Too many loud noises in my 20s.

[@Obsidian0Knight]

Yeah 👍🏻 Imma blame the speakers ! Not that I usually have them cranked 😅 😂. I dunno mate, hit thirty, now I guess I'm just old!

[@noiadev]

Was in my office and I was listening to this, "Hmm guess my headphones can't make that sound", from across the cubicles a younger tech, "Does anyone hear that noise?" fml

[@bloodlove93]

oh It's fine and natural to grow older,doesn't mean much ....besides the fact you're more likely to die before those of us who are younger. not helping?..it's just more likely, if it makes you feel better I'll probably die before you.

[@Crosshair1990]

Echolocating bats also have one of the most specialized cochleae. They have a disproportionately large swathe of their basilar membrane dedicated to their call frequency, which is not a typical adaptation in mammals, who normally have a fairly constant logarithmic(ish) frequency map along their organ of Corti. The distribution adds a lot of temporal information to the call, and means a lot of the signal processing for echolocation occurs at a mechanical level inside the inner ear. sincerely, a hearing researcher.

[@carbonwolf3865]

1:27 this is also why navy sonar is absolutely terrifying for divers, if nature can make echo-locating chirps and whistles dangerous, imagine the forces at play in navy ship sonar systems. Games dont do justice how powerful those pings are, you think "oh, theres someone out there using sonar and they might see a blip on a sonar scope" when in reality its "OW THAT HURT" on the low end and *"forever box"* *powerful* on the moderate end.

[@meatballsyrup2747]

5:34 “nrrrrer and nrrrrer”

[@RyZeNqz]

Nrrrnrr

[@tiagomelogames]

Idea for the next attempt! Using ultrasound microphones on each side of the head, and using a software to interpret them into recognizable sounds (walls can be warmer, and spiky things high pitched). Also, increasing the rhythm of the pulses will give the software more 'resolution'. This is amazing! I'm wondering why we don't have commercial solutions like that for blind people (maybe it exists and I don't know)

[@GeoffryGifari]

Dude... you can sell this experience as some sort of attraction in malls or something "Wanna be a bat?"

[@danielpetka446]

Can you find the moth? Wanna bat?

[@neskey]

this channel always comes out with the most batshit thumbnails and then completely deliver

[@NigelTolley]

I see what you did there

[@veorEL]

The sentance at 7:55 made me chuckle: This way, we have to "manually" use our head. Why not "neckly" use our head Great video, as always. You guys are the closes thing there is to Rick and Morty IRL.

[@PanzerkomandantFencer]

9:50 Nagareteku toki no naka de demo kedarusa ga hora guruguru mawatte~~~ what? ah yeh uhh sounds off the walls yes, head very much

[@lucasvignolireis8181]

is this tokipona language?

[@PanzerkomandantFencer]

@@lucasvignolireis8181 ...no

[@pittiebaby]

​@@lucasvignolireis8181prolly

[@MangInutil]

​@@lucasvignolireis8181 It's the romanized lyrics for Bad Apple!!

[@TheBackyardChemist]

FYI 18 and 19 kHz might be above the low-pass filter used in the audio encoder by KZbin. I have not downloaded and checked it, but it is common practice to improve low bitrate audio quality by low-passing with a -3dB knee at 17-20 kHZ

[@RyuuBaka]

I don't think so, I only say this because my cat freaked out when they were played hahaha

[@user-st2si3he1o]

I hope you are right. Otherwise I apparently have the hearing of an old person already

[@BirdbrainEngineer]

You are right, I just checked with Audacity, the sound is a flatline at those moments. Edit: It seems like KZbin frequency cutoff is 16kHz

[@n3ttx580]

@@BirdbrainEngineer lol, I could hear both. 18kHz very clearly, 19kHz faded out after a while and became this sort of sensation somewhere in the background. But I could 100% hear the 18kHz, and 19 at the beginning

[@the_mister_magister]

yeah they didn't sound like 18/19kHz at all and i've tested those in the past and I also remember youtube cutting everything above 16kHz

[@davidmende3409]

12:25 broo the gaslighting 😂 when you swear you found something, but bro just moves out of the way without saying anything

[@Hovzlozki]

Man being hit with the “older listeners won’t be able to hear these sounds” and then not hearing 18khz and 19khz at 25 hits like a rock 😭😭

[@TNTsquid.]

Same bro, and im only 20

[@DigitalJedi]

KZbin might be capping the really high frequencies to save some audio bandwidth. I'm not sure if they do it as I haven't downloaded and checked the video, but it at least used to be fairly common practice to put a low-pass filter of about -3dB above 16kHz on uploaded videos.

[@johngaynor4363]

Barely heard 18khz and I'm only 21, praying it's just bc my headphones didn't like it and crackled like hell during it (I'm coping so hard)

[@martinmarkov9707]

Laughs in 26yo who can hear them up close.

[@sc9604]

This sent me down a rabbit hole. On an iPhone I can not hear them, and with my blue tooth ear buds the band width isn’t there for such high frequencies. I can still hear 18khz so it might be the same for you, there are some websites for this

[@brianmontgomery1619]

Thanks for doing this. I came up with this idea 20 years ago. I just didn't have the resources or the acoustic knowledge really. Specifically using sound to detect edges and textures in an environment for the blind. My idea was to use a sort of sound flashlight held in the hand hooked up to headphones. Your approach is probably better with a head mounted unit. Also, I thought that musical tones at different frequencies would be used to differentiate textures and ranges so the brain could process it more easily and pleasantly. Think of a piano note for something smooth or a distorted electric guitar for something rough. As you point the emitter at a wall at an oblique angle and scan it back and forth, the pitch and tempo would increase as you scanned the wall. The human brain is remarkably good at recognizing patterns and you can create a musical depiction of a space. Also having two receivers could give you a stereo effect increasing the that sensation. Let me know what you think.

[@LHS_Shadow]

0:02 best introduction to a video ever 😂

[@slimeminem7402]

14:10 made me so happy for some reason 🎉😂. You nailed this, dudes!

[@Linuxpunk81]

I am a retired submarine sonar tech and I've heard all these ocean creatures and more, sperm whale calls are no joke 😅BTW your explanation for beam forming was great! I remember in sonar A school nearly everyone flunking the test on beamforming 😂(not me I hit 100%)

[@TechnologistAtWork]

My farts smell the nicest too

[@blakemcmillan5680]

In your opinion what’s the weirdest sound you’ve heard underwater that you could recognize

[@Linuxpunk81]

@@blakemcmillan5680 oh man, the loudness of snapping shrimp was a surprise, it sounds like thousands of people chewing on carrots 😂but to me the weirdest sounds are those made by walruses, it sounds like someone ringing a bell!

[@eaudesolero5631]

is there anywhere we can listen to recordings of these kinds of things? that would be neat

[@JohnnyShagbot]

@@eaudesolero5631 There's probably videos on YT of animal sounds recorded by sonar, be it military or commercial sonar.

[@TheWretchedOwl]

Scream at your food until you find it? So like a toddler?

[@metern]

Daniel Kish is a blind man who uses echolocation to not only navigate his environment but also tell what object is in front of him.

[@carlsoll]

5:40 This is so cool. I saw this *once* for Crowd Control, and thought 💭 when will this reach ‘Us’ verses ‘Law Enforcement & Military’

[@Yipper64]

8:57 noooo freaking goodness I lost my ability to hear these kinds of high frequencies. I knew it would happen eventually... Edit - I decided to finally try and make the sounds in audacity myself to try and see if its the video compression and such. I can hear 18khz, but barely hear 19khz.

[@king_james_official]

i think youtube compression might be doing some shenanigans. check with a frequency generator

[@pomprocks]

Audio compression is going to take out sounds people barely hear.

[@kacperkonieczny7333]

Some devices can't play high frequency sounds

[@jacen60]

please rest assured. most devices can't play above 17kHz. I tested with my speakers, headphones, and phone. I can hear 16990 but not 17000 because of the device limitations. my ears also kinda hurt now lol

[@jan237]

@@king_james_official If it uses the same algorithm as mp3, all frequencies above 16 khz should be cut off

[@oliverer3]

Phased arrays and beamforming are some of my favorite physics things. So naturally I loved this video!

[@AdamS-nd5hi]

That phased array is also how the fancy targeting and jamming radar works in the nose cone of our most modern fighter jets. Just more meta material lensing. Great video. Also, might be time for a haircut 😉

[@aftsfm]

8:51 I didn't even reach my 20s, why I can't hear it 😭😭

[@megan00b8]

I am thinking with this project what I'd do is leave the sound as ultrasonic, and instead convey the returns through some combination of actuators on the top of the head. The helmet itself already covers the skin on top of your head, making it's intended sensory capabilities useless, but you could remove the extra hearing burden and make use of that top of the head skin mayhaps. The human brain is an incredibly adaptive organ. Consider when you learn to drive a car or ride a bicycle, at first you consciously move your arms and legs to perform actions on the vehicle, but in a short time you don't think "I need to press a pedal and rotate the wheel", you think "I need to slow down and turn" you feel like the vehicle is a part of your body. One of my favourite experiments about this was the second thumb controlled by your big toe, where people would quickly change their internal body map to adapt for having a second thumb on their hand instead of a toe. This incredible adaptability of the brain is our greatest superpower because technically no matter how you modify your body, as long as there's a way to control it your brain will just adapt.

[@edgeman1135]

I love this channel. You guys feel like the scientists of old, combining knowledge from so many domains to do cool shit.

[@ui264]

12:30 - How has nobody mentioned that he almost immediately found a person? He kept chasing the camera person. (Who kept moving!!!!)

[@Jake_Gotthard]

Echolocation worked + he could hear footsteps but it was distorted by the echolocation Sound so he probably heard it and thought that was the echolocation Sound

[@highvis_supply]

Ah yes, ths infamous Japanese directional speaker kit from 2010

[@SolWayward]

I still have two of them I use to make house to house solicitors think they are hearing demonic voices.

[@călin-humanist]

Hi! Manbat is just crazy good, thank you so much for your work! I have a sight disability, and no current technology can help me see better, but my vision is still good enough for me not to depend on echolocation. So the #1 reason for me to try it would be sheer curiosity. #2 would be to support your work So how much should I donate in order to rent the Manbat for a month? And is there also an option to buy it?

[@luckydueces5873]

This has incredible implications on blindness assistance devices. Thanks for the cool experiment!

[@BoliVic96]

It might also be interesting to compare a person who has had blindness from birth, versus a person who became blind later in life.

[@zeveris913]

This is awesome! Would love to see how well you could find a moth in a room filled with obstacles. Having a blind person using rick roll to get around town would be hilarious!

[@GeoffryGifari]

How the surface structures on a bat's face can end up focusing and defocusing sound sounds cool enough for biomimetics

[@falconclaw105]

I remember watching a documentary from a long time ago about a blind guy that was able to ride bicycle by using something akin to an old tv clicker to create a sound to be able to usually avoid hitting things. So this was a fun confirmation of that documentary

[@trinomial-nomenclature]

I watched a documentary years ago about people who were blind and they were able to make a clicking sound with their mouth (at first they used a clicker) and successfully used it as echolocation and used it everyday to get around, most of them still used a stick as well, but still it was really cool to see how the body and brain could adapt for such a thing. Well done boys!

[@davidmende3409]

10:57 reject humanity, return to möth

[@gs.a.p.8350]

14:29 awkward high five is awesome 😂

[@wil7vin]

0:09 - When you mentioned a super power expected you to mention the weight class that one bat is flying dear lord

[@whiteeyedshadow8423]

1:10 my personal favourite part of dolphin anatomy is the "melon", its functionality is obviously to feed the rest of the body as a source of endless plant-based carbohydrate

[@thatonebab7351]

If I remember correctly, there is already at least one blind guy who echolocates to navigate, and is pretty successful at it. But I wonder if others would be able to do it with the assistance of the helmet.

[@early2000skid]

12:09 TARGET ACQUIRED

[@alexlandherr]

At 2:45, nice touch with the Zoidberg scuttle sound.

[@justicesportsman6020]

Your merch is not what I expected! Love the art and thought put into each item. 🤘

[@sethcain7434]

I love this channel. I truly appreciate the time and care you take to put into each of your videos.

[@segment932]

Me and a few other students wrote a paper a few years ago doing something similar. The difference is that we used a camera and a AI model to detect objects, then a text to speech module told the user how far the object where and one of five directions. Worked quite well but it had a problem with doorways and refrigerators. At one time during the final testing, a user even suddenly got a report that it told him "train 5meter to the left" in a empty room. It worked but I think your solution is better.

[@ramkitty]

The use of an ultrasonic beat freq to a detector on helmet and use a phase discriminator to provide some binaural audio to headphone may provide a more useful signal than the audible chirp.

[@umbrel]

Arguably, the ear-brain capabilities of frequency and direction detection from the incoming sound are much superior to the binaural processed signal. But it is a thing to find out.

[@yorkleroy5605]

​@@umbrelit could at least be used to eliminate the need for audible sound, allowing it to be used around other people without them having to hear it

[@umbrel]

@@yorkleroy5605 it can be very useful, but if the interface is to be a processed binaural signal, there is no need to limit the detector to sound, you could use microwave and hear through walls. Though a sound based interface is very limited for people who are not blind, an AR overlay would be more interesting then. For blind people a normal camera could be processed into a binaural signal for multiple objects at the same time. For the rest of us, I suppose that the most useful use would be to hear where the eyes can't reach, like placing a camera in the back of your head and hearing what's behind you.

[@threeMetreJim]

Two down-converting receivers fed from the same oscillator should be enough. Some radio amateurs use a binaural radio receiver and say the sensation is very interesting; different signals appear to be in different spatial locations.

[@yorkleroy5605]

​@@umbrelhey, those are some great ideas

[@Imtoolazytodothis]

“A power, which we need; A power, we need for ourselves.” - Every large company ever

[@pistol0grip0pump]

Bats can be both the cutest and startlingly peculiar little things 😂

[@ArturoEspinosaAldama]

An excellent application is for VR helmets, get an audible proximity warning through an accessory, instead of cameras, which are computationally expensive to use and you have to define a fence and so on. Standalone VR helmets which run on batteries can benefit from this and you can turn off the cameras and the whole fencing subsystem. Great project!

[@marshallhorton7526]

Two things may have interefeared with your test. 1 changing the shape of your ears can dramatically impact your ability to resolve where a sound is coming from. So the elf ears may have gotten in the way. Smarter everyday has a great video on this. 2 diffrent sounds are easier or harder to for humans to locate, the bat sound is goodidea but fairly high pirched, i would recommend trying "static" or the sound that white noise backup alarms use, because it was developed to be easy to tell where the sound is coming from. Tom scott had a good video on this as well.

[@kolliwanne964]

"I am Batman" *fiep fiep fiep*

[@haifutter4166]

More like Daredevil, if I'm not mistaken.

[@maxizockt7325]

how did you comment 6 hours ago this video came out 14 minutes ago

[@haifutter4166]

@@maxizockt7325 Early access for Patreons probably.

[@Nikarkos]

@@maxizockt7325 Patreons got early access

[@kolliwanne964]

​@@maxizockt7325 You can get a bit early access by supporting the channel :)

[@Argosh]

This is ridiculous and I love it. How is this not an assistance device for the blind?

[@mythzel898bet2]

Money... probably, though some people who are blind can do it without devices.

[@smellycat249]

He just made it.

[@haifutter4166]

@@mythzel898bet2 And that is, what I find amazing. Saw a documentary about a boy who taught himself echolocation, when cancer took his eyesight. The resolution he could achive was mindblowing. He could even ride the bicycle and detect objects of the size of a lipstick. Sadly his cancer returned in his teens.

[@haifutter4166]

@@mythzel898bet2 Ben Underwood. He did it with amazing resolution and precision. Edit: Don't know, why my comment was censored.

[@brookswift]

it is already

[@Manic640]

10:26 so theoretically if I made a version that was handheld I could rickroll random people from inside their head?

[@Anti-Smart]

I like this idea.

[@SBImNotWritingMyNameHere]

Devious

[@pittiebaby]

Devious

[@OLIVERCASHMUSIC]

I would love to see a visually impaired person test out this concept. I have a friend that could benefit so much from something like this. How could I get in contact with you to discuss how to make something like this to try ourselves? This whole idea is just absolutely astounding. I’m watching for the second time in a row to make sure I absorb all the information.

[@nethminchamika]

Very informative and fascinating video! Keep up the great work in exploring and explaining complex scientific concepts in such a clear manner. Looking forward to more mind-blowing content from you!

[@GameDesignerJDG]

I know that the sounds that dolphins and bats make come from their heads, but is there a particular reason why the speaker needs to be attached to your head? Would it still work, for example, if it was in the shape of a hand-held flashlight? I can see having the same frame of reference to compare to as being important, but a handheld device might be more useful to blind people in a day to day context. Maybe just turning your head with the source of the sound is enough? Another thing: have you experimented with echolocating using different sounds? I know you've played music and stuff over the speakers, but I'm interested to know what kinds of sounds work best for humans when echolocating. You used a bat's chirp in the video, but how does that compare to the clicking of a dolphin or even to sounds more natural to the environment we live in? What about a clock tick? White noise? Does the pitch matter? The amplitude?

[@rafaelcruzs2]

9:01 well, maybe I’m already going deaf at 20

[@SilverTao]

from what I remember, around 17/18 KHz is what people stop hearing around the age of 18. This is actually very wild for me because I remember watching a video on high frequency sounds when I was 16 and I could hear them very clearly. And yeah now I'm 21 and I didn't hear a thing. I'm getting old, man.

[@hiiambarney4489]

this has nothing to with deaf in that sense. It's like how people wearing glasses aren't technically blind. However, if you have been subjected to loud sounds over prolonged periouds of times this can happen quite early. (Think of loud bassy sounds, in cars or festival speakers on concerts and yes, even driving fast with windows down.... Especially that) The tiny hair "sensors" in your ear get damaged and result in less detectable audible range. Personally speaking... You did not miss much. I can't really hear the sound as much anymore but it's evoking a really screeching sensation, similar to what people feel like when someone scratches on a chalkboard.

[@MrSplonger]

I'm 23 and can't hear the sounds either. I also sometimes notice my peers hearing a very high pitched sound that I have to really tune in to barely hear. It is what it is.

[@DaniAurora23]

Damn my car stereo

[@dameygamey9167]

most speakers don''t play that high, like phone speaker can only get to likw 12.5KHz (or maybe it's from the high pitches not being setnt over the internet)

[@francismoree]

The experiment should've been done with just mounted Cameras for bonus angles. Having a moving Cameraman ruined a lot of your hard work getting results...he just kept walkign towards the moving Camera-man completely distracting him from potentially finding a moth much sooner.

[@TheTarrMan]

Dude, you're awesome. I bet a improvement you could try to further unlock this evolutionary trait is to have the 360 thing AND the focus thing with a little hand-remote that just has a fader knob you can switch back-and-forth. (Maybe a little button that plays everything at the same time, and a trigger for the speed). YOU COULD MARKET THIS TO BLIND PEOPLE AND REALLY HELP THEM OUT. There's already blind people who do clicks with their mouth for echolocation, so this principle is already proven to work. Someday they could actually make future versions that actually look like the VISOR from Star Trek with all this built in. Maybe it like plays an inaudible frequency (or they can even bluetooth connect to your car) and the radio antennas and sensors on the glasses transmits and receives everything and processes and plays back through bone conduction speakers built into the "VISOR Assembly in a audible frequency.

[@Sir_Uncle_Ned]

That is amazing. I never could have guessed our brains could so easily and quickly adapt to using sound for navigation.

[@thebrokeguy711]

Babe wake up We can now speak with bats and dolphins

[@TheJohtunnBandit]

Is this a new meme format? I don't remember anyone using this before like two days ago and now I've seen several.

[@thebrokeguy711]

@@TheJohtunnBandit idk i saw it in nile red's channel. im just bored

[@CrypidLore]

@@TheJohtunnBandit It's well over 5 years old at this point.

[@crackedemerald4930]

bats will only say "moth? moth? moth? moth! moth!"

[@TheLolzKnight]

Easy there, don't want to raise Posadas from his grave do we?

[@jimmy21584]

FWIW, the reason why earlier stealth aircraft were angular was because computers of the time were not powerful enough to model more complex shapes. Therefore they needed to go with low-polygon designs. Modern stealth aircraft do not need to be angular.

[@topc6444]

Some blind people make a clicking sound with the tongue to help navigating. Pretty fascinating stuff!

[@Ali.g.97]

1:30 my favorite part of the video 🤓 🍰