I built this, so, some build notes: IMPORTANT: Vcc1 and Vcc2 are switched in the schematic in the video! It doesn't seem to burn out the H bridge but be aware that they are labelled the other way in the datasheet. It's not very loud if you use the H bridge and 12 volts. If you crank it up to 24 or 30 volts it's a more reasonable volume, but the 7805 is going to get really hot if you power it off the same voltage. I tried feeding the modulated output from the 555 to a Sure Electronics 8 watt Class D amp I had, and that did work, but it introduces a decent amount of hiss. The H bridge is a lot cleaner, but it's harder to get the volume up. On the plus side it's louder and only needs 12 volts. The transducers do start to get warm running off the class D amp. It may be worth putting a low pass around 100-200khz on the class D output, but I didn't try it yet. It's super sensitive to the capacitance. I got lucky I guess because the two caps I picked to get into the right ballpark turned out to be pretty spot on 40khz. Even adding a 1pF to it detunes it slightly. A variable capacitor might be a good idea (alongside a fixed one, you only need a few pF of adjustment). If you are off 40khz by much it becomes almost inaudible. Anyway thanks for this CodeParade, even with the few hiccups I was able to recreate this and the effect pretty easily. It does really screw with you when it sounds like it's coming from somewhere else.
That's awesome! I'm so glad you got it working 😁 Those build notes are spot on with my experience as well. I also heard much louder volume with higher voltages (16-24v) but yes you'd have to ditch that 7805 for something like a buck converter, I just didn't have one on hand. Yeah, the capacitor tuning was really important, I kept putting different small capacitors in parallel and just tried to see which configuration was loudest. Even though the transducers are rated to resonate at 40kHz, I found that in my configuration, I got louder resonance closer to ~44kHz so it really needs to be tuned by ear anyway. I'd love to see pictures or video if you get the chance. And sorry about those Vcc's, I must have mixed it up when I labeled them!
By hot you mean hot for humans or hot for electonics? I'd put radiator on it
6 ปีที่แล้ว +36
@@GewelReal Linear regulators are one of the least efficient (but cleanest in terms of electrical noise) voltage sources. They burn excessive "volts" in heat. If you had a 7805 (very common 5 V linear regulator) and pulled 100 mA out of it with input voltage of 20 V, you'd be burning (20 - 5 - 1.2) * 0.1 = 1.4 Watts of heat and the regulator's temperature would get easily over 100 °C. Buck converters (such as those found in smartphones) are much more efficient and I'd definitely use one for this project, but sometimes the only you have laying around is a good old LM7805. :)
Here's a simple explanation from a physicist in terms of the slit diffraction shown in the video: I'm sure you've heard that higher frequencies result in smaller wavelengths, right? Imagine the waves incident on a slit. If a wavelength is large, the slit may appear "narrow" to the wave, similar to you walking through a doorway. You are aware there is a doorway and you change your behavior to ensure that your body gets through that door. Now imagine a smaller wavelength, such as an ant, going through that same door. Well now the doorway looks enormous. The ant hardly notices that it's even a dedicated doorway and hardly has to try to fit through. Thus he doesn't have to change his behavior and can continue walking straight through.
@@LaughingOrange He's basically using a normal audio signal, but encoded on a carrier high frequency ultrasound signal. The Ultrasound which cannot be heard has the property to not spread out much, so the audio is also being carried without spreading. If you wanna understand this just research FM radio waves. The signal is interpreted as the small frequency changes in the otherwise constant high frequency signal. BUT i have no idea why we can hear the carried signal. Isn't it still in high frequency range or am I missing something?
There are cool applications for this. Given that it "sounds like" the sound is coming from the reflective surface, you could use this as a spooker in haunted houses, or as a distraction generator in military or milsim situations.
Definitely would be good as a distraction generator, or for simulating sounds coming from certain parts of a room. You could use it for surround sound with minimal wiring too I bet. Instead of running wires to each speaker, they only need to be inanimate reflector boards for the sound waves.
I don't imagine the sound would be too high quality, though. When you're building a HiFi solution in your home, running wires for the speakers is part of the fun.
This seems to work like the HSS speakers. And I do use them in my haunt. Usually, to get sound to come from a projected image. Like lightning and rain on a wall or spiders/snakes/etc on the ceiling. It's really effective at throwing the sound onto the image without feeling directional as if from speakers off to the side.
These seem really useful in an arcade setting, where every machine wants to be blasting sound, but where you don't customers to be overwhelmed by said sound.
This is awesome. I think another reason it is highly directional is because you made a PHASED ARRAY where all waves are in phase. Therefore the wave peaks are constructive in front. I’d bet you can direct the sound electronically by shifting the phases of the different stealers to change direction. Look up phased array radar.
@@ObjectsInMotion CaptainDisillusion is very popular and well known. He possesses the popularity to match his value. Underrated, he would have less than one million subs with almost no mention of his name. Overrated, and he would have hundreds of millions of subs with his name being mentioned on social media every single day. But it's neither here nor there. He sits at a comfortable level of recognition to suit the amount of work he puts out, especially when taking into consideration his healthy Patreon earnings. Just because I don't think he's underrated, doesn't mean I think he's overrated. That's some damn fine ignorance you're exhibiting.
This is incredible: this could be used to send messages to anyone nearby, without anyone noticing, as long as so can send a canceling soundwave to all other people around (preferably not a large amount of people)
At first I was like “THIS IS CLICKBAIT! You didn’t turn it into a laser” but then I realized that lasers are defined as concentrated waves of sound or light
@@matthewminucci5649 a device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading barcodes, and in recording and playing compact discs.
As others already said, it fails at every step of the strict definition of a laser. Still, it has many laser-like properties indeed, I find it fair calling it a "sound laser". I mean, if hippopotamus means "water/river horse", I don't see why this wouldn't be valid
When thinking about how high frequency waves don't spread out as much, it's better to think about the wavelength. When a wave passes through a slit, it diffracts at the edges, you can sort of imagine this like a friction slowing the wave as it brushes past the walls on each side, which causes it to turn as it passes through, and on the other side is spreads out in a growing semi-circle/-sphere. If the wavelength is much smaller than the width of the slit, this is analogous to making the slit much wider. For a large section of the wave in the centre of the slit, it's as if there were no walls and it is travelling in empty space. The vast majority of the sound is able to pass straight through without diffracting.
When you said laser, I was imagining a soundwave so focused it could cut things, which I didn't think was possible. I guess it's not, but this was neat. I can still see tons of interesting applications for this.
Ultrasonic cutters are a thing, basically a pieco driving a blade. Useful for some rather tricky cutting operations th-cam.com/video/NBY_ES2V-l4/w-d-xo.html
You can use focused sound waves that can cut things. Any wave carries energy and, given enough time and energy, will heat up a surface, which will eventually cause burns or, in other words, cuts. Years ago, I attended a presentation in which a guy from MIT suggested that laser-like sound waves could be used in surgeries and even replace conventional lasers.
Nice result. What really makes it directive is the array. It is clever of you to modulate the sound to unltrasound freq. so that the BW to centre freq. is so small. Only then you can apply array theory and only then forming those speakers with separation of half wavelength of the carrier freq. (Ultrasound freq.) you get high gain at the bore sight while very little power going in other directions. Try changing the phase between speakers and you can change the main beam direction. Good work and well done👌
When I saw the number of speakers, I thought it would be. Slightly disappointed that they were just to make a "bigger" speaker. But otherwise very fun demo.
At high volume, you can damage your ear drums even if you don't hear, remember that your ears are exposed at the waves in the air. BTW that is why you don't see something like this on big. At the level you output is not different from a live performance, won't get you deaf but i say DON'T CRANCK THE OUTPUT POWER UP, is for your and others good. Very nice to see someone revive this old tech. 👍
High power versions are being used by police and military forces around the world against civilians as area denial "non lethal" weapons. They have been causing permanent ear damage.
@@selfhelp441 What how ears work or how sound waves work ? It's real nothing special, sound like music for example, is a combination of high and low pressure that hits your eardrum, your brain interprets this. Now the less known thing , any wave even in the inaudible range, over 20khz are still moving your eardrum even if your brain doesn't know how to process it and it says there is silence. Same with UV or IR lasers, you see nothing until you really see nothing as you get blind.
I don't know how i missed this, this is the best thing i've seen all year! Not because it's useful, but because it's so absurd, so simple, and apparently even works!
Bose used to have a 5.1 surround system built into a TV that worked on this very principle. It would position 4 virtual speakers on walls in the room, and the sound would be beamed to those locations. And then all of Bose's DSP stuff to fix up the sound. It was a very impressive tech demo.
i don't remember what bose had (possibly just a prototype and never a real product?) but yamaha *definitely* had this tech in their YSP (yamaha sound projector) soundbars, like the YSP-5600
@@vinylcabasse It was a rather short-lived product. But I remember this was supposed to be the premise of sound bars later. Like the YSP. I've never actually heard the YSP, but I bet it's awesome. I feel like in this area, Bose should have stuck with research, patents, and licensing. Moreso than making actual products. Instead they have just kinda turned into a boomy overpriced headphone brand. But their DSP stuff was super top-notch.
In one episode of Knight Rider, KITT played a sound behind the enemy to distract him, though KITT was physically in front of the enemy. I wondered how that was possible. Now I see it is possible. You could make a device to do that and used it to distract kidnappers so that the snipper can make a quick shot.
The circuit alters the duty cycle AND the frequency of the square wave to modulate the audio. But your ultrasonic transducers (aka speakers) are resonators tuned at 40Khz, so it will only produce a good output when the frequency happens to pass near the 40Khz mark during the modulation. I think that's why you have to crank the voltage to get a reasonable output. The ideal scenario should be a square wave of exactly 40Khz, and use the audio input to modulate only the duty cycle to get the most of your transducers. I have no idea how to do that with a single 555, but two of them should do the trick, using one in astable mode to generate a pulse of exactly 40Khz, then plug the output to the trigger to a second 555 configured as a monostable, then connect the audio input to the control voltage of the second 555. Your first 555 will be "pressing the trigger" of the second one 40k times a second, and the audio will be modulating the duration of each pulse on the second 555, giving a fixed frequency square wave with only the duty cycle modulated. Alternative you can use a microcontroller and tinker with its timer registers. There a couple of videos out there in YT showing how
The air absorbs the ultra sonic frequencies, because the heavier molecules can't move as fast as the lighter ones. This slows down the small waves and they collide forming a bigger wave of a lower frequency. This bigger wave can travel trough air more easily because it has more energy. The result is an audible frequency if this frequency was modulated into the original ultrasonic signal.
Imagine a horror attraction feeding scratching sounds into this and pointing it all over the walls so it's like something invisible is traveling the walls of the room.
Well, laser is actually an acronym. Quote from wikipedia, 'The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".' So, maybe this is more of a.. "sasvf", "Sound Amplification by Stimulated Vibrations of a Fluid". I chose "fluid" instead of "air" because theoretically it may operate in water too, or just any gas or liquid :p
I was always fascinated by the idea of a sound-based communication system between two machines, like a remote control car controlled by high-frequency sound
This reminds me of the “shut the fuck up cannon.” Its basically a directional mic that’s aimed at a person or rioter or something to record their voice and play it back with a 0.5 second delay. For whatever reason listening to your own words with a slight delay is really disorienting and it causes the person to slur their words together, slow their speech, and eventually make them do what the name implies.
@ CodeParade I would also need a pattern that pèrò do the 'reverse effect. Since I find myself having to investigate my neighbors who are behaving strangely and always keep an audio suppressor on\. You can understand what they are saying even though they are very far away but it is not possible to record so that I can have evidence to nail them down and have them arrested. Greetings.
Laser is the wrong term for that. The Phased array is more of a spotlight with a focused beam from emitters, not a medium that is stimulated to increase radiation of sound or light like a LASER. This is more correctly identified as a phased array as used in military radar and other directional sound and radio devices. This focuses sound like a phased array, not a LASER. Unlike a LASER, the array can be phased for receiving with directional pickup. This is sometimes used in sports stadiums.
Is this a phased array, though? I was under the impression that the collimation came from the fact that it was operating in the ultrasonic frequency range. I didn't hear him mention anything about adjusting phase (though I imagine that might let you scan this around without moving parts, which would be uber cool).
@@aceg81 If the phase can be adjusted, then it is steerable. A line array, all in the same phase is also a phased array. As such, the array makes a narrower beam than a single element alone.
Good video check list. 1. Codeparade Check 2. Cool hobbyist electronics Check 3. Physics Check 4. Lasers CHECK! Edit: CodeParade, Please, Please, Please do more electronic videos, or just video similar to this! I love it
I wanted to make such a device since I had 1st heard of the phenomenon, like 15+ yrs ago. There was very little info available. Just use a mic at the input to F with ppl at the mall from afar, make them think they're hearing things etc. way cool
These capsules say "T" (TX) and "R" (RX) on them, but they are practically identical and are operated through special ICs (such as the HC-SR04 module). I am interested in the suppressor schematic and now have to look for all the components as soon as possible. Thank you very much.
i have made one of this like 4 or 5 years ago, for my university research, but there was to muck noise. There is video called "audio spotlight' or something like that, where this effect explained more detailed. Actually its an old technology, first of thos were invented in early 50s.
I only have 40KHz speakers so I haven't tested anything else. But I've heard that higher frequencies are more directional, but the volume decreases more quickly with distance, so you can't project it as far.
Allegedly there are agencies already working on this. You can aim focused mechanical waves at a person, and the waves interact with the skull and resonate such that he feels like he is hearing a voice which no one else can hear.
All the major components are listed at 1:18 The passive stuff is just standard off-the-shelf parts. The only thing not listed that I added later is a large electrolytic capacitor between the output of the LM7805 to ground because the current spike from the speakers would cause too much voltage drop. For the speakers, any "ultrasonic transmitter" will work, just make sure they have a nominal frequency of 40KHz.
I understand that that is how LRAD works. The military uses it to make an uncomfortably loud ear piercing noise which only the intended target can hear while everybody else is safe so that nobody dare get too close to base or ship. They can also use it to psych the enemy by making it sound like there are tanks and helicopters within their personal space when the sound is from a mile away, really.
In NDT we've been doing this for a loooooong time. If you've ever heard about Phased array ultrasonic testing, it's almost the same principle. We have an array of elements that emit ultrasound wave, and by adjusting the delay between elements we can focus or steer the sound beam as we want
Surfaces that have both elasticity and dampening will demodulate the ultrasound to make the signal audible. Those surfaces can't keep up with ultrasonic frequencies. So, they absorb the ultrasonic part of the signal and emit the audible part of the signal. However, the surface amplifies the audible signal using the energy from the ultrasonic part. This works for walls and ear drums.
Just one question: the frequency domain of a square wave is rather nasty, with many, many high-order harmonics. Have you tried and had success with using a sine wave rather than square? It would complicate things but you'd have a different modulation
Probably makes no difference. These ultrasonic transmitters are really only sensitive to 40KHz, +/- a few KHz or so. The first harmonic of a 40KHz square wave is (iirc) at 120KHz, which elicits almost no response in the transmitter.
No it shouldn't because this does nothing of the sorts and is not even close to being like a laser. Sasers do exist but are so damn hard to research because of all the bullshit people put out as sound lasers. Sasers function in insanely high ultrasound frequencies such they are able to create plasma on contact with metal surfaces in some cases. I currently am considering construction of something that might operate like a real laser using clusters of specifically spaced, sized, and arranged spheres in hopes I can get frequency and phase coherence same as a laser without doing the insanity that is needed with cooling and ultrafine metal powders and rods of sasers. Only problem I forsee is potential size I might need but each object would have harmonics which need to resonate with a base tube such that they all pump a single frequency/phase.
That is so cool... Ha ha ha ha... I bet you thought I was talking about the device? No! They've been using that on us in the supermarkets for over a decade now. I'm fascinated about that swollen capacitor you're using in the circuit.
imagine adding bluetooth support and putting the lazer in a classroom where you could make it sound like the whiteboard is talking. you could do good and bad things with this. :)
wtf? this is so insane. would love to see this used as like a prank on your friends, like you played a super high quality version of your friend saying something and making it seem to other people like they said it
The single slit experiment you showed with an increase in wavelength causing a decrease in diffraction was just because diffraction is greatest when the width of the slit and the wavelength of the sound is equal. Having said that, a higher frequency could well affect the other effect you were talking about with modulating and stuff, I really don't know about that. Great video!
Idk, sound seems to come out of my speakers. Seriously though, I came here for the game related stuff and now this? Some serious set of skills you've developed 🙏
can someone pleaseeee link me to the website at 0:21 ?? my dad showed it to me when i was a kid and i LOVED it. i’ve totally forgotten what it’s called and i’ve (half heartedly) been trying to find it for years.
I will try to explain why the sound, or in general a wave, seems to be less dispersive for higher frequencies. Basically to describe a wave we use some parameters and one of the most important is the wavelenght λ (lambda). The wavelenght is inversely proportional to the frequency (f) so whent f is higher λ decrease. When a wave passes through a slit or encounter an obstacle a phenomenon called diffraction can occurr. Diffraction occurs only if the dimension of the obstacle is comparable to the wavelenght λ. If the wave encounters an obstacle comparable with λ, you can think as if it spreads out in a spherical pattern all over space. Of course the intensity too is spreaded out, but we will observe a maximum of intensity towards the center (where the sound is localized) and less intensity in other regions because of diffraction. It's often said that intensity is "modulated by diffraction". For sound waves in fact we have that λ is comparable with the major part of obstacle in our daily lives, it's because of that that you can hear someone voice in another room or behind a door. Hope that it will be useful. Good video though.
To understand the relation between the spreading of the wave and the frequency in 0:26 I reccomend watching this video: th-cam.com/video/Io-HXZTepH4/w-d-xo.html In short, as the wavelength gets shorter in relation to the hole (i.e. the frequency gets bigger) we get more destructive interference on the sides, thus focusing the beam.
"The circuit is simple" proceeds to show a graph that 70% of viewers have no idea how to comprehend and using vocabulary that makes no sense to said 70% to describe it.
The reason that smaller wavelengths bundle better is because to get a small beam you need to sum multiple spherical wave fronts together with the right phase relation. But then the beamwidth must be at least several wavelengths long so the more wavelengths you have the more bundled you can get your beam. When you get down to the order of magnitude of 1 to 5 wavelengths or so it stops being noticably bundled. This is also why parabolic reflectors must have a diameter multiple times the wavelength. Otherwise you just get diffraction.
I built this, so, some build notes:
IMPORTANT: Vcc1 and Vcc2 are switched in the schematic in the video! It doesn't seem to burn out the H bridge but be aware that they are labelled the other way in the datasheet.
It's not very loud if you use the H bridge and 12 volts. If you crank it up to 24 or 30 volts it's a more reasonable volume, but the 7805 is going to get really hot if you power it off the same voltage.
I tried feeding the modulated output from the 555 to a Sure Electronics 8 watt Class D amp I had, and that did work, but it introduces a decent amount of hiss. The H bridge is a lot cleaner, but it's harder to get the volume up. On the plus side it's louder and only needs 12 volts. The transducers do start to get warm running off the class D amp. It may be worth putting a low pass around 100-200khz on the class D output, but I didn't try it yet.
It's super sensitive to the capacitance. I got lucky I guess because the two caps I picked to get into the right ballpark turned out to be pretty spot on 40khz. Even adding a 1pF to it detunes it slightly. A variable capacitor might be a good idea (alongside a fixed one, you only need a few pF of adjustment). If you are off 40khz by much it becomes almost inaudible.
Anyway thanks for this CodeParade, even with the few hiccups I was able to recreate this and the effect pretty easily. It does really screw with you when it sounds like it's coming from somewhere else.
That's awesome! I'm so glad you got it working 😁
Those build notes are spot on with my experience as well. I also heard much louder volume with higher voltages (16-24v) but yes you'd have to ditch that 7805 for something like a buck converter, I just didn't have one on hand.
Yeah, the capacitor tuning was really important, I kept putting different small capacitors in parallel and just tried to see which configuration was loudest. Even though the transducers are rated to resonate at 40kHz, I found that in my configuration, I got louder resonance closer to ~44kHz so it really needs to be tuned by ear anyway.
I'd love to see pictures or video if you get the chance.
And sorry about those Vcc's, I must have mixed it up when I labeled them!
By hot you mean hot for humans or hot for electonics? I'd put radiator on it
@@GewelReal Linear regulators are one of the least efficient (but cleanest in terms of electrical noise) voltage sources. They burn excessive "volts" in heat. If you had a 7805 (very common 5 V linear regulator) and pulled 100 mA out of it with input voltage of 20 V, you'd be burning (20 - 5 - 1.2) * 0.1 = 1.4 Watts of heat and the regulator's temperature would get easily over 100 °C.
Buck converters (such as those found in smartphones) are much more efficient and I'd definitely use one for this project, but sometimes the only you have laying around is a good old LM7805. :)
@Gigs where did you buy your speakers?
@Gigs is this what you are talking about? store3.sure-electronics.com/2-x-8-watt-class-d-audio-amplifier-board-tpa3110
Super cool. Time to make a sound gun to make it seem like people are saying things they aren't.
That's just called politics!
Technical yellow-breasted chat.
*N WORD*
"Yo wassup mah nigga"
Aiming it towards some random guy, while a black guy is also there.
Or doing things they didn’t
🙎♂️💨
*"I don't know why it works like this, but I just accept it."*
Quantum mechanics in a nutshell
This video in a nutshell.
Here's a simple explanation from a physicist in terms of the slit diffraction shown in the video: I'm sure you've heard that higher frequencies result in smaller wavelengths, right? Imagine the waves incident on a slit. If a wavelength is large, the slit may appear "narrow" to the wave, similar to you walking through a doorway. You are aware there is a doorway and you change your behavior to ensure that your body gets through that door. Now imagine a smaller wavelength, such as an ant, going through that same door. Well now the doorway looks enormous. The ant hardly notices that it's even a dedicated doorway and hardly has to try to fit through. Thus he doesn't have to change his behavior and can continue walking straight through.
@@twilightknight123 cool...
@@LaughingOrange He's basically using a normal audio signal, but encoded on a carrier high frequency ultrasound signal. The Ultrasound which cannot be heard has the property to not spread out much, so the audio is also being carried without spreading. If you wanna understand this just research FM radio waves. The signal is interpreted as the small frequency changes in the otherwise constant high frequency signal. BUT i have no idea why we can hear the carried signal. Isn't it still in high frequency range or am I missing something?
Congratulations. You've independently prototyped the Long Range Acoustic Device
More like you tortured me with them for five years like a fucking asshole
Is that really how they work? Greater than 20khz?
More like the Fart Accuser Device, imagine playing a fart sound and pointing it on people
@@noname-codm4590 lmao the fact that people around are gonna think the objective farted
@@Kev98213 thats objectively true
You deserve more subscribers. honestly.
Seriously
i agree
@@citrusblast4372
Not enough oobleck or orbeez. You know the rules
What the number of subscribers then? Now it is 53k, I think it grows very quickly.
What was the number of subscribers then? Now it is 53k, I think it grows very quickly.
There are cool applications for this. Given that it "sounds like" the sound is coming from the reflective surface, you could use this as a spooker in haunted houses, or as a distraction generator in military or milsim situations.
Definitely would be good as a distraction generator, or for simulating sounds coming from certain parts of a room. You could use it for surround sound with minimal wiring too I bet. Instead of running wires to each speaker, they only need to be inanimate reflector boards for the sound waves.
I don't imagine the sound would be too high quality, though. When you're building a HiFi solution in your home, running wires for the speakers is part of the fun.
how are named this application
This seems to work like the HSS speakers. And I do use them in my haunt. Usually, to get sound to come from a projected image. Like lightning and rain on a wall or spiders/snakes/etc on the ceiling.
It's really effective at throwing the sound onto the image without feeling directional as if from speakers off to the side.
possibly use this in card as a way for people to listen to music when others don’t want to hear it, it’d be hard to stop the reflection tho.
I’m both disappointed you didn’t turn sound into light and impressed you explained and made a focused beam of sound
Exactly!
me lol
About turning sound into light: read up on pistol shrimp.
@@nolanwestrich2602 Or actual pistols.
Or explosives in general.
@@BierBart12 Well, that's more like producing light _and_ sound. Pistol shrimp produce light _from_ sound.
I would totally record fart sounds and point it at people to make it look like the sound came from them
Sound like?
It's funny to see others coming up with the same idea.
Or you could frame someone
Just sayin
menace
A quasi brown note device.
0:24 it is not dependent on the frequency, but on the ratio between the wavelength and the hole size!
Which, for a static hole size, are the same thing ;)
@@entropyzero5588 True, but it is important to realise that the math does not care about absolute units.
@@lithostheory idk about that. I've seen some complete chonkers in my time which the math would definitely care about.
Isn't wavelength inversely proportional to frequency?
@@revimfadli4666 I think you have to have a constant for it to be proportional, and wave speed isn't a constant.
the -sun- sound is a deadly laser
not anymore there's -a blanket- some paper
@@nade5557 yes that was beautiful
This thread is gold
hey can we -go on land?- "make sound?"
no...
why?
the -sun- "sound" is a deadly laser
not anymore there´s -a blanket- paper
Me: Hey can i make music?
CodeParade: NO
Me: Why?
CodeParade: SOUND IS A DEADLY LASER
Thank you, 68th anonymous like
r/unexpectedbillwurtz
Not anymore there's a blanket
@Maksym Cazymir, it’s called space.
@c6amp r/ihavereddit
These seem really useful in an arcade setting, where every machine wants to be blasting sound, but where you don't customers to be overwhelmed by said sound.
This is awesome. I think another reason it is highly directional is because you made a PHASED ARRAY where all waves are in phase. Therefore the wave peaks are constructive in front. I’d bet you can direct the sound electronically by shifting the phases of the different stealers to change direction. Look up phased array radar.
wtf you're more underrated than captaindisillusion
CaptainDisillusion is not underrated. What the fuck are you on?
@@dotXyore he is
@@dotXyore You seem quite... disillusioned.
@@dotXyore I don't think you understand what underrated means. If you think he isn't underrated, then you think he is more popular than he should be.
@@ObjectsInMotion CaptainDisillusion is very popular and well known. He possesses the popularity to match his value. Underrated, he would have less than one million subs with almost no mention of his name. Overrated, and he would have hundreds of millions of subs with his name being mentioned on social media every single day. But it's neither here nor there. He sits at a comfortable level of recognition to suit the amount of work he puts out, especially when taking into consideration his healthy Patreon earnings.
Just because I don't think he's underrated, doesn't mean I think he's overrated. That's some damn fine ignorance you're exhibiting.
This video idea is just awesome! I sincerely don't know how this hasn't gone viral yet! I'm spreading this on Reddit ;)
Woah, young integza
This is incredible: this could be used to send messages to anyone nearby, without anyone noticing, as long as so can send a canceling soundwave to all other people around (preferably not a large amount of people)
At first I was like “THIS IS CLICKBAIT! You didn’t turn it into a laser” but then I realized that lasers are defined as concentrated waves of sound or light
No. Laser is literally light exclusively.
Oliver I would like some proof.
@@matthewminucci5649 a device that generates an intense beam of coherent monochromatic light (or other electromagnetic radiation) by stimulated emission of photons from excited atoms or molecules. Lasers are used in drilling and cutting, alignment and guidance, and in surgery; the optical properties are exploited in holography, reading barcodes, and in recording and playing compact discs.
LASER is an acronym for Light Amplification by Stimulated Emission of Radiation. So is only related to light.
As others already said, it fails at every step of the strict definition of a laser. Still, it has many laser-like properties indeed, I find it fair calling it a "sound laser". I mean, if hippopotamus means "water/river horse", I don't see why this wouldn't be valid
"If you only want one person to hear it it has to be pretty quiet, and can reflect easily off of PEOPLE!! " Wow sick vid!!
When thinking about how high frequency waves don't spread out as much, it's better to think about the wavelength.
When a wave passes through a slit, it diffracts at the edges, you can sort of imagine this like a friction slowing the wave as it brushes past the walls on each side, which causes it to turn as it passes through, and on the other side is spreads out in a growing semi-circle/-sphere.
If the wavelength is much smaller than the width of the slit, this is analogous to making the slit much wider. For a large section of the wave in the centre of the slit, it's as if there were no walls and it is travelling in empty space. The vast majority of the sound is able to pass straight through without diffracting.
dude made this super complex borderline magical tech seem like childs play
When you said laser, I was imagining a soundwave so focused it could cut things, which I didn't think was possible.
I guess it's not, but this was neat. I can still see tons of interesting applications for this.
Ultrasonic cutters are a thing, basically a pieco driving a blade. Useful for some rather tricky cutting operations th-cam.com/video/NBY_ES2V-l4/w-d-xo.html
@@aleksandersuur9475 That's not even close to the same thing.
@@skepticmoderate5790 Maybe not, but if you want to cut things with sound you don't exactly have many options to choose from.
You can use focused sound waves that can cut things. Any wave carries energy and, given enough time and energy, will heat up a surface, which will eventually cause burns or, in other words, cuts. Years ago, I attended a presentation in which a guy from MIT suggested that laser-like sound waves could be used in surgeries and even replace conventional lasers.
Sound is the key to the future. Plz keep at it and share more.
Nice result. What really makes it directive is the array. It is clever of you to modulate the sound to unltrasound freq. so that the BW to centre freq. is so small. Only then you can apply array theory and only then forming those speakers with separation of half wavelength of the carrier freq. (Ultrasound freq.) you get high gain at the bore sight while very little power going in other directions.
Try changing the phase between speakers and you can change the main beam direction.
Good work and well done👌
Nice work! This is the principal behind Sound Lazer, LRAD and Ultrasonic Weapons function!
Make a phased array so you can steer the beam!
When I saw the number of speakers, I thought it would be. Slightly disappointed that they were just to make a "bigger" speaker. But otherwise very fun demo.
@Banter Maestro2 so, from array two waves are coming out ,one that is modulated and one is ultrasonic ? is in't it ? plz reply ?
@Banter Maestro2 how much is spacing between the transducers ?
At high volume, you can damage your ear drums even if you don't hear, remember that your ears are exposed at the waves in the air. BTW that is why you don't see something like this on big. At the level you output is not different from a live performance, won't get you deaf but i say DON'T CRANCK THE OUTPUT POWER UP, is for your and others good. Very nice to see someone revive this old tech. 👍
Just like you can damage your eyes with optical lasers without realizing it...
High power versions are being used by police and military forces around the world against civilians as area denial "non lethal" weapons. They have been causing permanent ear damage.
could you provide some more insight or links explaining this?
@@selfhelp441 What how ears work or how sound waves work ? It's real nothing special, sound like music for example, is a combination of high and low pressure that hits your eardrum, your brain interprets this. Now the less known thing , any wave even in the inaudible range, over 20khz are still moving your eardrum even if your brain doesn't know how to process it and it says there is silence. Same with UV or IR lasers, you see nothing until you really see nothing as you get blind.
I don't know how i missed this, this is the best thing i've seen all year! Not because it's useful, but because it's so absurd, so simple, and apparently even works!
Bose used to have a 5.1 surround system built into a TV that worked on this very principle. It would position 4 virtual speakers on walls in the room, and the sound would be beamed to those locations. And then all of Bose's DSP stuff to fix up the sound. It was a very impressive tech demo.
i don't remember what bose had (possibly just a prototype and never a real product?) but yamaha *definitely* had this tech in their YSP (yamaha sound projector) soundbars, like the YSP-5600
@@vinylcabasse It was a rather short-lived product. But I remember this was supposed to be the premise of sound bars later. Like the YSP. I've never actually heard the YSP, but I bet it's awesome.
I feel like in this area, Bose should have stuck with research, patents, and licensing. Moreso than making actual products.
Instead they have just kinda turned into a boomy overpriced headphone brand. But their DSP stuff was super top-notch.
Is this what they used in that speech jammer "sound gun"? It kind of looks like it. I want to make one now!
daaaaaaaaaaaaamn yeah
Non linear acustic+beamforming=even better sound laser.
Electronically controlled delay elements so one can steer the beam with no moving parts...
i just loudly said wow when i realized the effect. awesome video
Now make it a phased array where you can point it in many directions. This is cool stuff man. Subscribed for sure!
In one episode of Knight Rider, KITT played a sound behind the enemy to distract him, though KITT was physically in front of the enemy. I wondered how that was possible. Now I see it is possible. You could make a device to do that and used it to distract kidnappers so that the snipper can make a quick shot.
This would be a really good device for Halloween prank. This is amazing.
The circuit alters the duty cycle AND the frequency of the square wave to modulate the audio. But your ultrasonic transducers (aka speakers) are resonators tuned at 40Khz, so it will only produce a good output when the frequency happens to pass near the 40Khz mark during the modulation.
I think that's why you have to crank the voltage to get a reasonable output.
The ideal scenario should be a square wave of exactly 40Khz, and use the audio input to modulate only the duty cycle to get the most of your transducers. I have no idea how to do that with a single 555, but two of them should do the trick, using one in astable mode to generate a pulse of exactly 40Khz, then plug the output to the trigger to a second 555 configured as a monostable, then connect the audio input to the control voltage of the second 555.
Your first 555 will be "pressing the trigger" of the second one 40k times a second, and the audio will be modulating the duration of each pulse on the second 555, giving a fixed frequency square wave with only the duty cycle modulated.
Alternative you can use a microcontroller and tinker with its timer registers. There a couple of videos out there in YT showing how
The air absorbs the ultra sonic frequencies, because the heavier molecules can't move as fast as the lighter ones. This slows down the small waves and they collide forming a bigger wave of a lower frequency. This bigger wave can travel trough air more easily because it has more energy. The result is an audible frequency if this frequency was modulated into the original ultrasonic signal.
This defies the reality I've experienced so far, cool!
Imagine a horror attraction feeding scratching sounds into this and pointing it all over the walls so it's like something invisible is traveling the walls of the room.
Without even realizing, this is my third time stumbling upon your videos while searching for weird stuff. I guess it's time to subscribe!
Well, laser is actually an acronym. Quote from wikipedia, 'The term "laser" originated as an acronym for "light amplification by stimulated emission of radiation".'
So, maybe this is more of a.. "sasvf", "Sound Amplification by Stimulated Vibrations of a Fluid". I chose "fluid" instead of "air" because theoretically it may operate in water too, or just any gas or liquid :p
jedi sound saber, May the ultrasounds be with you
That is really cool!!! I can imagine there could be quite a few uses for something like that!
This is a great twist on sound. I'm going to build this, thanks!
I was always fascinated by the idea of a sound-based communication system between two machines, like a remote control car controlled by high-frequency sound
just because you cant hear 400khz controller frequency doesnt mean its not a sound wave.
This amazing video/concept and the positivity in the comments section is making my day! Keep the good stuff coming!!
This reminds me of the “shut the fuck up cannon.” Its basically a directional mic that’s aimed at a person or rioter or something to record their voice and play it back with a 0.5 second delay. For whatever reason listening to your own words with a slight delay is really disorienting and it causes the person to slur their words together, slow their speech, and eventually make them do what the name implies.
Do you have a link or source to any info about this? I googled but didn’t find anything.
I hate when the car bluetooth is off. It's so distracting.
This has been done to me in my own home for about 2 years now.
@ CodeParade I would also need a pattern that pèrò do the 'reverse effect. Since I find myself having to investigate my neighbors who are behaving strangely and always keep an audio suppressor on\. You can understand what they are saying even though they are very far away but it is not possible to record so that I can have evidence to nail them down and have them arrested. Greetings.
Laser is the wrong term for that. The Phased array is more of a spotlight with a focused beam from emitters, not a medium that is stimulated to increase radiation of sound or light like a LASER. This is more correctly identified as a phased array as used in military radar and other directional sound and radio devices. This focuses sound like a phased array, not a LASER. Unlike a LASER, the array can be phased for receiving with directional pickup. This is sometimes used in sports stadiums.
I came looking for this comment.
Is this a phased array, though? I was under the impression that the collimation came from the fact that it was operating in the ultrasonic frequency range. I didn't hear him mention anything about adjusting phase (though I imagine that might let you scan this around without moving parts, which would be uber cool).
@@aceg81 If the phase can be adjusted, then it is steerable. A line array, all in the same phase is also a phased array. As such, the array makes a narrower beam than a single element alone.
Good video check list.
1. Codeparade
Check
2. Cool hobbyist electronics
Check
3. Physics
Check
4. Lasers
CHECK!
Edit: CodeParade, Please, Please, Please do more electronic videos, or just video similar to this! I love it
I wanted to make such a device since I had 1st heard of the phenomenon, like 15+ yrs ago. There was very little info available. Just use a mic at the input to F with ppl at the mall from afar, make them think they're hearing things etc. way cool
These capsules say "T" (TX) and "R" (RX) on them, but they are practically identical and are operated through special ICs (such as the HC-SR04 module). I am interested in the suppressor schematic and now have to look for all the components as soon as possible. Thank you very much.
Cool! To get better results you need to make phase-shifting delays for ultrasonic drivers instead of this type of modulation...
how much is spacing between the transducers ?
It's a relationship between frequency and size of the transducer - that's why we use those folded tweeters the guys at Infinity invented.
i have made one of this like 4 or 5 years ago, for my university research, but there was to muck noise. There is video called "audio spotlight' or something like that, where this effect explained more detailed. Actually its an old technology, first of thos were invented in early 50s.
I wanted to do this FOREVER but I was afraid of the math!!!!! THANK YOU!!!! SUBSCRIBED!
Does increasing / decreasing the carrier frequency have a significant impact on sound quality?
I only have 40KHz speakers so I haven't tested anything else. But I've heard that higher frequencies are more directional, but the volume decreases more quickly with distance, so you can't project it as far.
is this why am radio can be transmitted so far
oh ok
Allegedly there are agencies already working on this.
You can aim focused mechanical waves at a person, and the waves interact with the skull and resonate such that he feels like he is hearing a voice which no one else can hear.
Do you happen to have a component list for what you used? I'd like to try this out for myself
All the major components are listed at 1:18 The passive stuff is just standard off-the-shelf parts. The only thing not listed that I added later is a large electrolytic capacitor between the output of the LM7805 to ground because the current spike from the speakers would cause too much voltage drop. For the speakers, any "ultrasonic transmitter" will work, just make sure they have a nominal frequency of 40KHz.
@@CodeParade Thanks!
CodeParade what transducers are those?
I got them a long time ago so I don't remember the exact brand. It might have been these ones:
www.amazon.com/dp/B01FDGTXT4/
I understand that that is how LRAD works. The military uses it to make an uncomfortably loud ear piercing noise which only the intended target can hear while everybody else is safe so that nobody dare get too close to base or ship. They can also use it to psych the enemy by making it sound like there are tanks and helicopters within their personal space when the sound is from a mile away, really.
You have created the spell, "Send Message!"
In NDT we've been doing this for a loooooong time. If you've ever heard about Phased array ultrasonic testing, it's almost the same principle. We have an array of elements that emit ultrasound wave, and by adjusting the delay between elements we can focus or steer the sound beam as we want
Surfaces that have both elasticity and dampening will demodulate the ultrasound to make the signal audible. Those surfaces can't keep up with ultrasonic frequencies. So, they absorb the ultrasonic part of the signal and emit the audible part of the signal. However, the surface amplifies the audible signal using the energy from the ultrasonic part. This works for walls and ear drums.
Now to turn this into a rotating "soundhouse"
Sound is only bumping molecules not fast enough to be light but almost in your case...it is like slow light.
Very interesting concept. I wonder if this has potential in movie theaters or VR set ups.
Epcot used them
This is fascinating. I feel like this could have some really cool applications
Just one question: the frequency domain of a square wave is rather nasty, with many, many high-order harmonics. Have you tried and had success with using a sine wave rather than square? It would complicate things but you'd have a different modulation
Probably makes no difference. These ultrasonic transmitters are really only sensitive to 40KHz, +/- a few KHz or so. The first harmonic of a 40KHz square wave is (iirc) at 120KHz, which elicits almost no response in the transmitter.
@@Spritetm to rephrase, the speakers filter the square wave.. which yields a (near) sinusoidal wave.
I have heard about this on tv about two years ago but never knew what it was as i wanted to build one.
Then I found this video and going to try it.
Ventriloquist's dream
Wow, this _sounds_ incredible!
Since Laser is short for Ligth Amplification by Stimulated Emission of Radiation, this should be a called "Saser"
No it shouldn't because this does nothing of the sorts and is not even close to being like a laser. Sasers do exist but are so damn hard to research because of all the bullshit people put out as sound lasers. Sasers function in insanely high ultrasound frequencies such they are able to create plasma on contact with metal surfaces in some cases. I currently am considering construction of something that might operate like a real laser using clusters of specifically spaced, sized, and arranged spheres in hopes I can get frequency and phase coherence same as a laser without doing the insanity that is needed with cooling and ultrafine metal powders and rods of sasers. Only problem I forsee is potential size I might need but each object would have harmonics which need to resonate with a base tube such that they all pump a single frequency/phase.
Best project bro... Explained everything i needed...
Does anyone know what would happen if the carrier wave had a lower frequency, say 35kHz? Would the modulated wave penetrate through paper better?
How are you so amazing at this?
Please never change. Your content makes me so happy.
I think they had one of these at a local Best Buy on a video game demo setup. I always wondered how it works!
That is so cool... Ha ha ha ha... I bet you thought I was talking about the device? No! They've been using that on us in the supermarkets for over a decade now. I'm fascinated about that swollen capacitor you're using in the circuit.
imagine adding bluetooth support and putting the lazer in a classroom where you could make it sound like the whiteboard is talking. you could do good and bad things with this. :)
wtf? this is so insane. would love to see this used as like a prank on your friends, like you played a super high quality version of your friend saying something and making it seem to other people like they said it
So it's basically the "throw voice" shout from Skyrim XD
The single slit experiment you showed with an increase in wavelength causing a decrease in diffraction was just because diffraction is greatest when the width of the slit and the wavelength of the sound is equal. Having said that, a higher frequency could well affect the other effect you were talking about with modulating and stuff, I really don't know about that. Great video!
Wow. If I had one of those, I'd most definitely use it for trolling in school.
:v
Nice! Works like a LASER would.
Idk, sound seems to come out of my speakers.
Seriously though, I came here for the game related stuff and now this? Some serious set of skills you've developed 🙏
can someone pleaseeee link me to the website at 0:21 ?? my dad showed it to me when i was a kid and i LOVED it. i’ve totally forgotten what it’s called and i’ve (half heartedly) been trying to find it for years.
This is the site I captured the clip with: www.falstad.com/ripple/
CodeParade yes! thank you so much
You could cheat on tests with that, multimillionare idea IMO
If you're able to sneak that into a test without anyone noticing, I don't even think you need it...
@@Adecker100 I think the idea is someone outside the class projecting the answers into your ear.
So if you put a high tone on it, you have a anti neighbour's cat laser. Awesome
This is some brilliant engineering tbh
This is other wise known as a sonic screwdriver from Doctor Who
I will try to explain why the sound, or in general a wave, seems to be less dispersive for higher frequencies. Basically to describe a wave we use some parameters and one of the most important is the wavelenght λ (lambda). The wavelenght is inversely proportional to the frequency (f) so whent f is higher λ decrease.
When a wave passes through a slit or encounter an obstacle a phenomenon called diffraction can occurr. Diffraction occurs only if the dimension of the obstacle is comparable to the wavelenght λ.
If the wave encounters an obstacle comparable with λ, you can think as if it spreads out in a spherical pattern all over space. Of course the intensity too is spreaded out, but we will observe a maximum of intensity towards the center (where the sound is localized) and less intensity in other regions because of diffraction. It's often said that intensity is "modulated by diffraction".
For sound waves in fact we have that λ is comparable with the major part of obstacle in our daily lives, it's because of that that you can hear someone voice in another room or behind a door.
Hope that it will be useful. Good video though.
Good video would like to try it out but I don't have equipment -_- and money to buy it ...
You don't need to have 30+ speakers if you're worried about the cost. It even works with only 1, though much quieter.
This is fascinating. Thanks for building this so that we may see.
To understand the relation between the spreading of the wave and the frequency in 0:26 I reccomend watching this video: th-cam.com/video/Io-HXZTepH4/w-d-xo.html
In short, as the wavelength gets shorter in relation to the hole (i.e. the frequency gets bigger) we get more destructive interference on the sides, thus focusing the beam.
That's awesome this is the first video of yours I watched look forward to more.
"The circuit is simple" proceeds to show a graph that 70% of viewers have no idea how to comprehend and using vocabulary that makes no sense to said 70% to describe it.
I love ppl like this.. Making the world Better one idea 💡 at a Time..
2:19 you can make it look like someone is farting
The reason that smaller wavelengths bundle better is because to get a small beam you need to sum multiple spherical wave fronts together with the right phase relation. But then the beamwidth must be at least several wavelengths long so the more wavelengths you have the more bundled you can get your beam. When you get down to the order of magnitude of 1 to 5 wavelengths or so it stops being noticably bundled. This is also why parabolic reflectors must have a diameter multiple times the wavelength. Otherwise you just get diffraction.
point it at someone and play a fart sound and watch everyone think it was them
crazy, I just got in trouble for having paper on my walls in my apartment. you win again cal tech.
instead of pointing this at someone's eyes
*point it at someone's ears*
Starring into the sun like