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

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.

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

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

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

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.

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!

<a href="#" class="seekto" data-time="729">12:09</a> the cameraman messed up the echolocation. The "bat" knew there is something in front of him but the cameraman kept moving, causing confusion.

<a href="#" class="seekto" data-time="869">14:29</a> goes for a high five, remembers he's blindfolded, pretends to fix hair. Classic.

<a href="#" class="seekto" data-time="33">0:33</a> a yes, the dark art of physics. Causing suffering and despair in all physics students

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.

<a href="#" class="seekto" data-time="951">15:51</a> "There's a blind person staring at me..." "How can you tell?" "I can FEEL Miley Cyrus in my head..."

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

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

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

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!

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

<a href="#" class="seekto" data-time="946">15:46</a> 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.

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

<a href="#" class="seekto" data-time="850">14:10</a> made me so happy for some reason 🎉😂. You nailed this, dudes!

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.

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

<a href="#" class="seekto" data-time="794">13:14</a> echolocated the cameraman

<a href="#" class="seekto" data-time="750">12:30</a> - How has nobody mentioned that he almost immediately found a person? He kept chasing the camera person. (Who kept moving!!!!)

<a href="#" class="seekto" data-time="92">1:32</a> Decibels in water are not same as Decibels in air. I think you should have clarified that. A different reference is used in water

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

<a href="#" class="seekto" data-time="537">8:57</a> 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.

<a href="#" class="seekto" data-time="869">14:29</a> awkward high five is awesome 😂

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

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.

<a href="#" class="seekto" data-time="570">9:30</a> 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.

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 😭😭

<a href="#" class="seekto" data-time="745">12:25</a> broo the gaslighting 😂 when you swear you found something, but bro just moves out of the way without saying anything

<a href="#" class="seekto" data-time="939">15:39</a> 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.

Just bought a hoodie and t-shirt, the designs are awesome and it supports an amazing channel 😊

<a href="#" class="seekto" data-time="729">12:09</a> TARGET ACQUIRED

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

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!

Ben about to high-five a blind person was gold!

Really interesting the idea of using this technology for the blind. Reminds me of a documentary about a kid called Ben Underwood who lost his eyes as a child. He taught himself how to 'see' by making clicks with his mouth and thus being able to tell apart his surrounding, but to an astonishing degree. There is a clip where he's skating around on his street navigating between cars, another where he is playing basketball. I think the documentary was called 'The boy who see's without eyes'.

<a href="#" class="seekto" data-time="14">0:14</a> " A power we want for ourselves" _Using echolocation to find weed in a grass field_

FYI 18 and 19 kHz might be above the low-pass filter used in the audio encoder by UKposts. 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

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

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%)

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.

The sentance at <a href="#" class="seekto" data-time="475">7:55</a> 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.

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)

Ah yes, ths infamous Japanese directional speaker kit from 2010

"I am Batman" *fiep fiep fiep*

Stunning content! Yes definitely you should try this on some vison impaired people. I remember seeing a clip of a blind man who learned how to ride a bike and navigate by listening to the echo of the click sound he made with his mouth, this can work like on steroids, vision impaired people can take a big advantage of this highly directional sound, this would add a lots of resolution. Looking forward to the next one!

<a href="#" class="seekto" data-time="590">9:50</a> Nagareteku toki no naka de demo kedarusa ga hora guruguru mawatte~~~ what? ah yeh uhh sounds off the walls yes, head very much

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

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.

Favorite part of the video was the fact that the dude with the helmet pointed at the camera man and went to where they were standing 3 separate times

Fun fact: Daniel Kish is a blind man who uses a form of echolocation to navigate. Theres a video of him describing a park he's never been in just using his echolocation.

<a href="#" class="seekto" data-time="657">10:57</a> reject humanity, return to möth

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 😉

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!

Very cool. Also appreciate the info on those transducer arrays. Answered some of my questions

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!

<a href="#" class="seekto" data-time="9">0:09</a> - When you mentioned a super power expected you to mention the weight class that one bat is flying dear lord

This is also a really good explanation of how radar works, and would be a good training aid for avionics students.

using never gonna give you up to echolocate yourself is one of the most internet thing i've ever heard

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

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

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.

ill be honest... i read echolocation as "echocolation" and became really intrigued for a second

<a href="#" class="seekto" data-time="313">5:13</a> hey just a heads up that there should be a warning on these for photosensitive people, the strobing patterns can set off an epileptic episode or migraine in some. (I suffer from photosensitive migraines that make me temporarily blind and in extreme pain, and this segment unfortunately set off an episode for me)

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

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.

Kinda interesting how when you went first, you kept noticing the camera guy who kept moving… and then it seemingly threw off your calibration because you knew something was there, but he kept moving away, so it seems like you just ignored that and wrote it off… but you were right. Should’ve told the camera guy to just announce themselves and let you keep going instead of potentially messing you up lol

Babe wake up We can now speak with bats and dolphins

<a href="#" class="seekto" data-time="541">9:01</a> well, maybe I’m already going deaf at 20

incredible video ! just to clarify, other means are available than parametric speakers to obtain such directivities, whether by having sources that are huge relative to wavelength (say 4 to 16 λ, which yields coverage angles of 18 to 4.5 degrees between -6 db points) or by using beam forming in the pass band of the speaker. that being said, controlling directivity is easier with small wavelengths

<a href="#" class="seekto" data-time="2">0:02</a> best introduction to a video ever 😂

<a href="#" class="seekto" data-time="67">1:07</a> melon🍈

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.

The way this was presented is hilarious as hell. Good job guys.

i love the casual explanation off additive synthesis <a href="#" class="seekto" data-time="558">9:18</a>

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

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

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!

this was super awesome. I always thought it would be impossible for us to do what bats do to process the return signals, but in retrospect I shouldn't have been surprised. We already have a good sense of where sounds are coming from and how far away they are, but it's just so natural that I don't really think about it

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

Thanks now I have "YOU SPIN ME RIGHT ROUND BABY RIGHT ROUND LIKE A RECORD BABY RIGHT ROUND RIGHT ROUND" stuck in my head 😭

<a href="#" class="seekto" data-time="530">8:50</a> sound interacts with other sound so if you cant detect because its out of the range, like old and young, you can use the sound you have to see the alterations from the other sound. Like laying a blanket down and seeing the alterations/deformations through your own blankets outlines.

19kh: can't hear. 18kh: vibrates my brain.

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

At <a href="#" class="seekto" data-time="165">2:45</a>, nice touch with the Zoidberg scuttle sound.

as someone with a background in radar and antennas, I commend you on how well you explained the concepts.

<a href="#" class="seekto" data-time="163">2:43</a> is amazing. Great costume design. 5 stars.

I have seen a blind person make sounds with their mouth and use the return to orientate them self. Still impressive to see how easy this skill was to pick up for you. I guess having the narrow beam of the speaker makes it a lot easier.

<a href="#" class="seekto" data-time="448">7:28</a> not really, the shown F-117 was so angular because of software limitations for calculating the reflection at the time. Newer stealth aircraft like F-22 are nice and rounded, because computers (and software) got powerful enough to simulate the reflections. I recommend learning the story of how they developed it at Skunk Works. Funniest part is that the plane was really unstable, but they just decided to use a computer system to basically force it to behave by constant microadjusting of the steering surfaces.

Try modifying the shape of the folds and hollows in your ear with putty. The pinna folds allow you pinpoint sounds. Also test up and down locating with and without ear pinna modification. I think you will have some great results with a visually impaired and blind using the Manbat 9000. There are a few people who use echo location already to be able to ride bicycles without sight.

I saw something similar tested in the early 80s. A blind man was able to use it to successfully echolocate his way around a room and find people without running into walls.

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.

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

The constructive and destructive interference patterns that you talked about with starlink and what not is also how the F-35 radar scans specific points allowing it to stay stealthy while the radar is doing its radar things

i would absolutely love to see this developed into a visual aid for the blind! years ago i was experimenting with this concept, but lost track and momentum, but it still lingers in my mind as a truly good aid!