I Bought a Recording Jammer. It’s Legal.

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With this Ultrasonic Recording Jammer, Linus can finally speak his mind! Of course, he was already doing that..
Discuss on the forum: linustechtips.com/topic/15683...
Some light reading about ultrasonic jamming:
synrg.csl.illinois.edu/papers...
people.cs.uchicago.edu/~raven...
counterespionage.com/ultrason...
arxiv.org/pdf/1904.08490
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CHAPTERS
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0:00 Intro
1:20 Some Bold Claims
2:19 How does it work?
5:06 Surely AI will save us!
6:18 Poor little guy...
8:02 SPOILER ALERT!
9:12 All shapes and sizes
12:02 Is there anything a 58 can't do?
12:45 We joke because we love
13:52 Credits

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12 май 2024

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Комментарии : 2,5 тыс.

@fanta6789 15 дней назад

Poor Elijah has to now wear both helmet and ear plugs.

@iliketodostuff123 15 дней назад

i feel that. i can hear stupid high frequencies.

@hirudasanguinen4073 15 дней назад

@@iliketodostuff123 with one ear i can hear the capacitors of my screen, the other i cannot

@junkheadINC 15 дней назад

Why would it be illegal?

@Biomancer81 15 дней назад

Nah, they sold the helmet.

@repatch43 15 дней назад

@@junkheadINChealth effects might be really bad. Just because you can’t hear it doesn’t mean it can’t hurt your ears

@kcrede 15 дней назад

Not “Jeffrey Epstein didn’t kill himself” lol lip reading was a little easy for that one

@greatestytcommentator 15 дней назад

You beat me to it!

@alexisbell8865 15 дней назад

right! XD lip reading skills too good tp know he saying

@Fishvap 15 дней назад

Where does he say that? At the beginning?

@jackinzbox. 15 дней назад

@@Fishvap0:43

@znhxnxzjx 15 дней назад

BRUH

@Flornmonk 14 дней назад

DON'T get this if you own a dog.

@msmith3395 8 дней назад

But DO get it if your neighbor does. I’ve been looking for a doggie STFU button for a while.

@Flornmonk 8 дней назад

@@msmith3395 Chaotic evil energy lol

@MajesOnTheXbox 6 дней назад

Instruction unclear. Sold my dog.

@Luis-gz3oo 3 дня назад

@@Flornmonk that's chaotic neutral tho

@Flornmonk 3 дня назад

@@Luis-gz3oo buying that jammer just to shut up your neighbor's dog is pretty much the definition of evil haha

@A.Achorn 15 дней назад

OMG I'm dying the Quebec joke with the editors note even throwing down a "Tabarnak" was icing on the cake thanks for keeping it Canadian!

@corrompu98 15 дней назад

They really dared. Tabarnak osti caliss 😠😆

@RagnarokLoW 14 дней назад

never heard a single canadian say tabarnak.

@ComradePhoenix 14 дней назад

As an American, I have no idea what the hell a Tabarnak is, but I strongly suspect the Quebec joke was done to fill in a canadian content quota.

@corrompu98 14 дней назад

@@ComradePhoenix it's a french canadian slang and not sure my english isn't perfect maybe someone can correct me, but I think you can say "damn" or "holy shit" to replace Tabarnak. In France they would rather use Putain or Putain de merde

@guillaume-labrie 14 дней назад

@@corrompu98 yeah that's the gist of it. Our swear words are pretty much all based on Christian church paraphernalia, so it doesn't translate well. We're essentially saying the name of the little cabinet they keep the host, the little white circles representing the body of Christ.

@unvergebeneid 15 дней назад

Fun fact, with loud noises in the near ultrasound range, you can sometimes not hear them but they still cause pain, because the auditory stimulus and the pain stimulus are physically separated in the inner ear.

@Tehn00bA 15 дней назад

Isnt that what they used to try to implement as crowd/riot control for the police?

@oiytd5wugho 15 дней назад

There's some kind of cricket where I live, can't hear the bastard but it feels like a pin stabbing my ear. Like it's _kind of_ a sound, but the sound is just pain

@BirnieMac1 15 дней назад

Largely because it’s just pressure waves Also the pain stimuli is seperate in EVERY organ system because we use specialised afferent nerve fibres to sense different kinds of pain - like we wouldnt have many C fibres because thermal isn’t as high an issue, but we’d have a lot of A alpha, beta and delta Delta is probs the important one because its the faster version of C fibres Alpha fibres are whats involved in the cochlear of the inner ear for balance and proprioception and the beta fibres are just touch

@WereCatf 15 дней назад

Interestingly, some RU-vid videos cause me to feel this unpleasant pressure in my ears, even if I can't hear any specific sound. I should dump the audio from the video the next time I come across one and check what frequencies I can see there.

@JackWse 15 дней назад

Yeah as someone that gets completely bounced out of a yard like a cat when it has those little laser sensing get off my lawn devices lol.. this sounds like a hellscape! I can't wait for the cyberpunk dystopia where those are just basically everywhere and we've evolved around it with extra consequences!

@KristianNowak 15 дней назад

5:19 "I don't even like water cooling! I think it's a waste of the money!" Ok Linus

@Shaurya_Pant 15 дней назад

Damn nice catch.

@jimmyzhao2673 15 дней назад

Good one !

@yuvrajdarekar5056 15 дней назад

It's a waste of my money*

@SnowyRVulpix 15 дней назад

You lip readers scare me far worse than any recording device 😂

@somefreshbread 15 дней назад

He doesn't though. It just gets views!

@donotworried 15 дней назад

Topic being interesting is one thing, but this video was really well produced as well! From cutting off the background music for punchlines, to well written dialogue/script. 11/10.

@watema3381 14 дней назад

Most definitely. One of their best yet.

@blender_tom 14 дней назад

6:40 a google search will show you many studies on the effects long term exposure to ultrasonic noise: "studies conducted to date in Poland and worldwide indicate that ultrasonic noise may cause excessive fatigue, headache, discomfort and irritation?

@crazykleiner 12 дней назад

And i am sure it's can damage ears .it's still blasting huge noise .

@TheOmegaAlfa День назад

Can you point out where to find these? Probably LTT meant that what this particular device emits is untested, it's terrible wall of noise all the time.

@JMUDoc 15 дней назад

So it's a Hypno-toad.

@FlyingCIRCU175 15 дней назад

LTT Labs is a tabloid compared to Gamers Ne--ALL GLORY TO THE HYPNOTOAD

@manywhere 15 дней назад

Or sequel to Tenet? I prefer Hypnotoad episodes.

@that44rdv4rk 15 дней назад

ALL GLORY TO THE HYPNOTOAD

@lurtiskoe 15 дней назад

that's hilarious hahahahahaa

@brownbelpois 15 дней назад

ALL GLORY TO THE HYPNOTOAD

@BizzWhacken 15 дней назад

0:43 Linus is a real one for that.

@lurac5710 15 дней назад

he truly didn't kill himself

@laundrybasketdemon 15 дней назад

😭😭😭😭😭

@insideeffect6964 15 дней назад

Idk about truly but seems you got part if that right 😂😂😂@lurac5710

@PliebertGex 15 дней назад

Did he just say- no way my mans Linus Tech Tips- Did he say Jeffry Epstein didn't kill himself?

@alamincomic7068 15 дней назад

6th sense finally came out to do the job

@kirkshangout 15 дней назад

I love the Riker stickers on the laptop in the "meeting room". Classic Riker stepping over chairs to sit in them.

@kevinmitchell766 13 дней назад

Power moves like that are why he's number one.

@TatsuZZmage 13 дней назад

Back injuries exacerbated by the early costumes being too tight made one of the best power moves, from being thrown from a horse

@doslover 13 дней назад

Oh thank goodness, I was going to ask why it was Riker sitting on a Christmas tree 😅

@4RILDIGITAL 14 дней назад

Epic walkthrough on understanding the limitations of such devices in real scenarios. Really got a clearer perspective on how these jammers could be defeated by different types of microphones and their placements.

@davidyusupov1116 15 дней назад

This jammer sound effect sounds like the sandworm from dune 2

@13orrax 15 дней назад

lol it replaces any recorded audio with a hanz zimmer soundtrack

@Shiro_Amada 15 дней назад

The Reapers are invading.

@theRPGmaster 15 дней назад

Linus Al Gaib!!!

@brownbelpois 15 дней назад

More like the HYPNOTOAD.

@Aaa-dv3oi 15 дней назад

FRRR I thought it was just edited from the video to make it seem that way, but that makes so much sense in terms of the movie

@WespectRamen 15 дней назад

I loved that little joke about Colin's only opportunity to finally let his voice be heard, was jammed lol

@benwu7980 15 дней назад

I like to think of myself as pretty clued in on most internet memes or trivia, but I have no idea where the Colin one started from.

@bootsyz3343 14 дней назад

@@benwu7980 Same. Let me wait here for someone to enlighten us.

@pacboygamer6728 14 дней назад

@@benwu7980 he fuckes up a lot. started a few months ago. and he gets mad at his fuck ups and sometimes pushes it on his mates. also he wears a helmet a lot. idk if its a joke or a special needs thing.

@pu239 13 дней назад

@@pacboygamer6728 thats not colin that's elijah

@helper_bot 13 дней назад

@@benwu7980 i may spread some little evil misinformation but on top of my head i think he's just not an English speaker so it doesnt make sense even if he did answer the question

@CapArchy 15 дней назад

Really wish you had tested with some standard phone mics, since I feel like that's the most likely meeting-room recorder

@TheIMadManI 12 дней назад

The writers and directors for this video are freaking awesome. Beautifully shot and the bits of comedy sprinkled through just elevate this video so much. Thank you for all you do

@Antigen__ 15 дней назад

Finally, a Hans Zimmer machine

@Natsukashii1111 15 дней назад

That's so close to the sound haha

@jdancouga 15 дней назад

Interstellar intensify

@SwirlingDragonMist 15 дней назад

That’s the sound of your speakers compressing, if you had full spectrum coverage in your sound system, those parts of Zimmer’s work would sound like music instead of being totally crushed. This is also why you don’t want to send LFE to your mains. At times It’s just too much for them.

@JackWse 15 дней назад

Oh you're not wrong! In so many ways! The theater when I finally saw dark Knight return whatever, the third one, was completely blowing out the speakers at the theater causing them to flop just like this stupid thing lol.. But hey sound mixing is hard apparently.

@JackWse 15 дней назад

@@SwirlingDragonMist so I usually do that if I can, but I also have full range triples with 12-in woofers? Is is that going to be a problem as well? It just to me made sense to not use a subwoofer when I had four technical subwoofers that were capable?

@davekelloway3337 15 дней назад

Elijah is not the the meme that LTT needed, but is 100% the meme it got.

@charlesandrews2513 15 дней назад

I look forward to seeing Elijah in the next X-Men movie.

@tubesockromance 15 дней назад

The one at 5:20 is him saying something along the lines of "I kid you, I don't even like watercooling. And, it's a waste of money"

@jwake928 15 дней назад

Excellent writing and execution on this video well done lmg

@RC-1290 15 дней назад

8:12 that's colins actual voice

@BladeWalker91 15 дней назад

Biblically accurate voice of Colin

@specodhec341 15 дней назад

Is he saying the obvious "yeah, what the fuck?"

@gasracing5000 15 дней назад

His voice is higher pitched than I expected?

@Ari.Atland 15 дней назад

@specodhec341 , could be a homophone.

@catmangaming2020 15 дней назад

I don't want to be reminded about this game existing 50 times in a day

@timxyz68 15 дней назад

Depending on the amount of decibels this thing outputs it is likely damaging your hearing. Just because you cannot hear something doesn't mean the acoustic pressure isn't harmful to your ears.

@TeenPerspektiva 15 дней назад

Yep. Cause its still vibrating, just the vibration cannot be understood anymore

@12thMandalorian 15 дней назад

i mean you can either be cancelled or be deaf, we all know what option we are choosing

@TatsuZZmage 15 дней назад

I expect a bunch of corrupt cops trying to prevent being recorded being crap cops in america to go deaf then.

@OmniMontel 15 дней назад

If you can be cancelled and blind you can probably be cancelled and deaf as well.@@12thMandalorian

@moneybilla 15 дней назад

@@TatsuZZmage lmao someone's a tab bit special or has a case of the tisms😂😂

@hobbitronic 15 дней назад

Watching this video, I felt like a Linus explained video or aside to explain some of the deeper concepts behind frequency analysis would be a good addition. I think that even without the deeper mathematical grounding, using the platform to give the layman a rundown of concepts like fourier transforms would be a bit of a public service to bridge the gap as to how stuff like this can be developed and analysed, and give people a better capacity to understand how different type of graphs work

@martinkeatings7126 14 дней назад

In Scotland we actually have quite a few of these deployed in public (perhaps on a slightly different frequency) but turned down so they are just really irritating. As you said at the start of the episode, hearing becomes worse the older you get, so those under the age of 21 have a much higher range of hearing than older folk. These devices are used in places where it is inappropriate for teenagers to hang around (and often do like most teenagers, in groups, and at night) and are causing issues. There is some debate about them being used by companies (i.e. takeaways) because as you said long-term effects are not really studied yet, but their use here is for exactly the purpose that Elijah experienced (albeit at a much lower level) - namely to drive the teens loopy with the sound so they leave the immediate area.

@borderlinecontent8661 9 дней назад

Problem with them is that angry old folk put a handful of them in their front garden so they activate every time you walk past and when they live 3 doors down from the corner shop having a barrage of piercingly high pitched noise i think they are more of a nuisance then the kids around the area

@Ordolph 15 дней назад

One thing that's worth noting is that pressure waves (sound) outside of the range of human hearing can still cause hearing damage if it's loud enough. Many people who have spent significant amounts of time working with aircraft will be quite familiar with that.

@fungo6631 14 дней назад

In what way does it damage the hearing if it cannot be picked up?

@woolver42 13 дней назад

@@fungo6631 The eardrum is still agitated, the sensory cells in the cochlea still get shaken around and break.

@raikhovalencia3835 12 дней назад

@@woolver42so theoretically this device could be used as a super evil hidden hearing damage inducer???

@karolakkolo123 12 дней назад

@@raikhovalencia3835 Yes, but there surely is a frequency limit past which the cells stop being agitated because at some point the frequency becomes high enough that the cells don't have a chance to move much before the pressure switches from low to high every cycle. So there's a limit even to that. And by the way, some pets can hear much higher than humans can, so dogs could probably pick up that an insidious device like this is hidden somewhere.

@cvp5882 10 дней назад

@karolakkolo123 Not exactly true. There are pressure waves at ultra-low frequencies powerful enough to rupture your eardrums. Its not necessarily the frequency that determines its destructive properties, but the pressure and sound wave's energy. Any extremely loud noise can cause hearing damage, whether we hear if or not.

@reeepingk 15 дней назад

Worth noting that high amplitude noises, regardless of whether we can hear them, can still damage our hearing.

@Shotblur 14 дней назад

In the same way that sound is pressure and an explosion can blast your ears out, sure, but for the most part, the ear is sensitive only to the frequencies that can damage it.

@fordsimpson2792 12 дней назад

@@Shotblur you're wrong and all you had to do to not be wrong was google the thing you were replying to before spouting nonsense

@rkan2 11 дней назад

@@ShotblurEnergy is energy

@toniguli 15 дней назад

I don't really ever comment, but I really liked this video, especially the balance between technical stuff and the real world implications. Great job and please do more of the deep dive tech stuff in the future. Love it.

@headspacetheace 15 дней назад

I'm always here for the audio tech videos, it's so interesting

@Sleemon1337 15 дней назад

2:36 sick use of the lumafield

@Kaizagade 15 дней назад

Didn't even think about that when watching it! That's so cool, thanks for pointing that out!

@JamesR624 15 дней назад

6:18 *Turns on jammer* *Elijah spontaneously becomes Turtle.*

@no-no-noku 13 дней назад

On older video game consoles like the Mega Drive (SEGA Genesis) had a low-pass filter integrated into the sound chip (more though the components and low quality of the signal forced higher frequencies to get lost), and this was fortunate as some retail games have bugs in them which cause extremely loud high-pitched chirping at all times. Without this filter, many games would have caused permanent hearing damage in many gamers. Nearly all emulators of these systems add a low-pass filter and enable it by default for this reason. Now we have a device that's portable and encouraged to be turned out for long periods of time which is also undetectable to the ordinary human ear that does the same thing. Fantastic.

@BrandonHortman 15 дней назад

I love this episode! I wish I knew the spl of the device! It appeared to be very high relative to an assumed 55db conversation judging by your REW software analysis

@SwaggieSteve 15 дней назад

I can't believe how many times he said the 'N' word just to prove a point

@leonro 15 дней назад

Linus must've been sick to claim that thing about Norwegians.

@thedudely1 15 дней назад

he really dropped that hard R

@mackado 15 дней назад

Linus and Grant O'Brien, both in one week. What a shame....

@unvergebeneid 15 дней назад

With a hard r.

@gasracing5000 15 дней назад

Contact your local lip reader for a transcript of the scrambled audio. 😅😂

@LKLM138 15 дней назад

I remember a article about playing some high pitch noise in a mall to deter youth hanging out in the mall. They can hear it, but elders can not. And it was aimed to certain times of the day. I remembered this when the Eliah bit came in.

@grumpy2.0 15 дней назад

They've been banned I believe, in some countries. As they can damage the Ear with prolonged exposure.

@Tehn00bA 15 дней назад

So true. They even started to develop crowd control versions for riot vans, but i dont know if its used or banned. (The microwave riot van one scares me the most)

@craigpoole9218 15 дней назад

Mosquito alarm

@Oscar-xs9cv 15 дней назад

They still do this where I live. I'm 31 and still annoyed

@benwu7980 15 дней назад

@@craigpoole9218 Yeah , Mosquito anti-social anti-loitering. They installed one in a building I worked around 6 years ago, and had to have it disconnected within a week.

@scottdean7246 15 дней назад

6:45 What do you mean? we literally have a diagnosis for continues tonal exposure in the form of SSHL (sensorineural hearing loss) and NIHL(noised induced) which comes with load of studies on the effects of sudden or consistent low to high tones. and you can literally see the frequency's dangers by how potent they look on your measurement mics heat map, and by the wincing pain Elijah seemed to be in. Or was that played up for the video

@jamcdonald120 15 дней назад

5:10 great, try it with one TRAINED with the distorted audio instead of non distorted. Those things cant even hear though some fan noise

@YouTube-Security 15 дней назад

About the potential danges of the Jammer. The way I see it, is that just because you cannot hear it, dosnt mean it can't hurt you. Hearing damage stems from the little hairs in your ears breaking of, due to excessive movement. What I could imagen is them being broken off over time, simply because they are still moving.

@thecasualfly 15 дней назад

Totally.. same thing such as noises that may not sound loud but you are around them all the time causes hearing damage.. like noisy machinery .. why it's important to wear hearing projection even though it might not seem "loud"

@zaphenath6756 15 дней назад

i'm guessing something like this machine is what caused the hearing damage to the people in the cuban embassy. the US gov't hid this kind of audio jammer in the walls or whatever, didn't realize all the damage they were causing, and refused to own up once all the injuries were brought to light

@Klaevin 15 дней назад

except that if those hairs move, then you could hear. If you can't heara frequency, then that hair is either dead, or the nerve attatched to it is severed. The inverse is true, as well : if you can't hear, then no hairs are moving, or the nerve is severed to those frequencies. So the way I see it, unless you can hear something, you aren't getting hearing damage, especially if you're talking about high frequencies. Low frequencies however, could blow your eardrum, but at those energy levels, you'd be out of breath, burned and blown on your ass from the bomb that just blew up right next to you.

@nikkiofthevalley 15 дней назад

@@KlaevinThis is false. You can get hearing damage from ultrasound. The nerves have a response time, which means that high frequency signals won't get picked up properly. The hairs are still vibrating at that frequency, which can damage them if the sound is loud enough.

@Skrenja 15 дней назад

Hearing loss tends to start with higher frequencies first.

@RiginJustino 15 дней назад

0:43 the fact that we can absolutely tell what he said is hilarious holy shit

@the_legendary_poseidon 15 дней назад

What did he say tho? I'm guessing he said 'Jeffery Dahmer didn't kill himself !' but I'm not too sure

@aftdawn 15 дней назад

@@the_legendary_poseidonWrong Jeffrey, its Epstein not Dahmer

@thesnowman2509 15 дней назад

Lmao what what he said was fact.

@detaart 14 дней назад

2:30 I didn't know that this is how sound works. Thanks Linus!

@serj112 13 дней назад

The Sony transmitter Linus uses has a function to filter out ultrasound, it’s “OCUPNCY SENS = ON” in the menu. It’s designed to remove audio issues caused by ultrasonic occupancy sensors, I wonder if it has any effect on the jammer. It’s really a question of how linear the input stages before that filter are, because if the nonlinearities are high enough to act as a mixer, then the ultrasound will have already mixed down to audible frequencies and will be untouched by the filter.

@GodardScientific 15 дней назад

What the heck is up with the production quality of this video?? The b roll, the jump cuts to natural reactions and natural feeling comedic reactions and responses?? New editor, you’re appreciated 😂

@Matthew-ht5yn 15 дней назад

It’s Mark

@HealyHQ 15 дней назад

@@Matthew-ht5yn Oh, hi, mark.

@agasthyareddy9137 15 дней назад

Here for when Linus sounds like an A-10 Warthog

@Tehn00bA 15 дней назад

Someone needs to photoshop this RIGHT NOW

@anthonypace5354 3 дня назад

It seems like just by observing the patterns used by the wave emitter, you could just observe it applied to background noise, cancel out the pattern and look for data that doesn't correlate to rebuild your audio. You could then, if the sample was garbled, just reconstruct it, which is as simple as running it through some AI trained to rebuild based on levels of noise. A little advanced for the average individual, for now, but, at least at first glance, seems very doable.

@daftlife-ns5hc 14 дней назад

combination tones are so cool. iirc, keys on a keychain dont even jangle in the audible spectrum (somewhere around 40k hz), you just hear the lower perceived combination tones they make.

@TheAcadianGuy 15 дней назад

12:48 As a French Canadian, I approve this message.

@jimmyzhao2673 15 дней назад

I believe in a 'distinct society', as long as someone else pays for it.

@sammycooly1709 15 дней назад

Maybe someday

@scott7699 15 дней назад

As a US-CAN dual citizen, I also approve this message.

@DMSparky 15 дней назад

Do it. I’d love to see how a provincial Brexit would go. Quexit I guess.

@francoismenard6704 15 дней назад

@@DMSparky Better than the ROC is thinking. People always neglect the power that control of the St-Lawrence river represent. Quebec could really hurt the economy of Ontario if it blocked or heavily taxed passage of merchandise. And also there is a ginormous hydro electricity potential that Quebec cannot exploit because of how the federal control what can be built in the river.

@KipSunChaser 15 дней назад

3:45 Bro it knits a blanket out of sound waves. That's awesome!

@InternetKilledTV21 12 дней назад

As a former Rochester, NYer the lip-reading factor still applies! Rochester among their vast history is a large deaf and hard of hearing community, like Washington DC and Los Angeles. You learn to lip read whether you realize it or not. Especially if someone's cochlear implant dies (or hell, if they don't have one) reading lips is needed to communicate. At least for me, this made me extremely aware (involuntarily) of the shape my mouth makes when saying words. Indeed though, Jeff did not veil his own eyes in darkness.

@DaringlyLDN 14 дней назад

Love the use of video feedback loops for the shots at 3:17 and 8:39. Looks super sleek with the blue, red and purple lighting! 🔥

@hyzenthlay7151 15 дней назад

Elijah hearing it is like how some people (like myself) can hear those ultrasonic sensors for animals. That, and love the Commander Riker sticker on the laptop!!

@HelamanGile 15 дней назад

I can hear those frequencies too and they can really mess you up and make you feel like you want to throw up

@defeqel6537 15 дней назад

@@HelamanGile have you tried barking at them? I have an acquaintance who thinks that works

@lars2k1 15 дней назад

Those things are hell. While others then just go confused "I dont hear anything", it hurts my ears. I don't get why anyone can put those in their garden, often not even aligning them properly so everything sets them off. Or the so called mosquitoes, that generate high pitch noises only younger people can generally hear, to prevent a spot becoming a 'hanging out' spot. I walk past one quite often and in the evening it makes a high pitched noise, that my ears neither really like.

@Warutteri 14 дней назад

Or the sound of old CRT monitors and TVs, back in the day many people thought I was crazy when I said I knew whenever our neighbours were watching TV because I heard the sound of the picture tube through the walls 😂

@tyrgoossens 14 дней назад

@@Warutteri I'm well into my 40's and I can still hear coil whine from some devices that even my teenaged kids can't hear. It's pretty annoying.

@Adam_Boots 15 дней назад

I love the Riker Maneuver stickers on the lid of the laptop.

@devtank 15 дней назад

This is cool, I've never heard of them before, and my hobby is field recording. Looking at that heat map, its a repeating pattern, and I would suspect that with governmental level budgeting and an interruption free life, one could determine the frequency variations that stand out from the repetition, run through extremely high and low bandwidth filtration and rebuild from there. Maybe throw in a second channel offset by .05 millisecond delay, for dimension.

@TheTygrane 13 дней назад

I'm glad they did a smattering of different mic, but it would have been interesting to see how the polar patterns of a given microphone may have correlated, rather than just the external geometries for directionality.

@fredwupkensoppel8949 15 дней назад

2:48 I like how he didn't need to change from his regular voice for the high pitch

@Neojhun 15 дней назад

Oh soo that's how Futurama's Hypnotoad works.

@maulerrw 13 дней назад

so is it like an amplitude modulated ultrasonic transducer? That’s how you can make directional speakers, which are super cool. you can pinpoint a sound at a specific position like a sound spotlight.

@nebulousintent733 15 дней назад

this was an awesome video! would love more in depth videos like this!

@MrSmore 15 дней назад

Linus could have used this when he dropped that HARD R!!!!

@MTMProductions 15 дней назад

💀

@ZachMauch 15 дней назад

For those that don't know, he didn't actually do it. He was just talking about it on WAN show and mistakenly thought "Hard R" refered to calling someone "Ret***ed". Luke informed him that it meant putting the r at the end of the n word.

@theRPGmaster 15 дней назад

@@ZachMauch Don't listen to this guy. Just misinformation. Linux Sebastian actually said the ultra super duper hard R

@michaelmcconnell7302 15 дней назад

@@theRPGmaster CAN CONFIRM

@DarkForce2024 15 дней назад

I'm from the US, and even I had to look this one up. As a matter of fact, I forgot all about it and had to look it up AGAIN yesterday (with the whole Stellar Blade thing), and I was like "I've read this before, this is familiar". NOW I remember, it was from the WAN show! Thanks!!

@forayz2385 15 дней назад

stores should use this to prevent "prank" youtubers from making content

@wingracer1614 15 дней назад

Doing so would drive off the handful of customers that can actually hear it and once it's use got out in the open (which wouldn't take long since some people can hear it) could lead to lawsuits from people claiming hearing damage or other BS problems which may very well be frivolous but still cost money to defend. And of course once that news is out, using it would be pointless since anyone wanting to make a video in your store could easily find out how to defeat it.

@claudiobizama5603 15 дней назад

@@wingracer1614 stores used to have a "mosquito" that makes a high pitch sound that specifically aim at teens loitering People are evil

@anonymous-zg7wh 15 дней назад

@@wingracer1614 Im not sure what it is these some people are hearing, is it that they have above average sound range? Why did elijah nearly explode at that sound?

@forayz2385 15 дней назад

@@wingracer1614 I meant flipping it on when people are obviously trying to make content but your point still stands

@HerpaDerp-ht8hy 15 дней назад

@@anonymous-zg7whHe’s young. Typically speaking, the younger you are, the higher frequencies you can hear.

@alexxiv14 14 дней назад

you didn't explicitly cover it but I'm curious how this works with microphones with fur or foam windscreens given that a few layers of clothes greatly reduce the effectiveness

@zacharykessler2206 14 дней назад

I love love love the audio tech vids. Thanks again yall!

@MrNortySpock 15 дней назад

Loved the spectrogram and the explanations. Well done for taking a complicated system (frequency jamming) and translating it into plain English!

@vedranart 11 дней назад

Yeah, me too! Tho, might use Praat software next time instead ;)

@MixMeMcGee 15 дней назад

Using the a frequency response that matches the handheld you’re holding while talking about it…. So good. Thank you!

@Wizardess 15 дней назад

Are you sure it is the diaphragm going non-linear or is it the subsequent electronics experiencing a heavy overload? A simple low pass filter between the diaphragm and the first amplifier might show some interesting effects. I'd also check what could be done with intentional more predictable filtering on what reaches the microphone would do. BTW - your ears are non-linear. This is how the voices in the toilets for the Cirque show at the New York New York casino in Las Vegas work. {o.o}

@claybirdyshaw5737 15 дней назад

These have been around for a long time. A guy at my high school had a modified YakBak that did this. You have to hold it very close to a microphone and everyone could hear a slight static noise. It was a neat trick tho.

@Gamersb3stfri3nd 15 дней назад

I really like these deep dives on interesting tech. Even if it's not something I would ever use, just having the understanding of how it works, how the microphones are designed and how these kinds of things interact with those designs is interesting

@Devrij 15 дней назад

Here's the thing, there's more to it than just overwhelming the diaphragm. You can blow out the mems diaphragm and have it just clipping out like mad, but you also have the digital aliasing of the audio it's recording that reduces the recorded frequency into the audible range, and you also get harmonics that are closer to audible noise as well. All of that makes ultrasound really hard to keep out of an audio recording. Generally speaking, mems mics are out for anything where high amplitude ultrasound is playing, as you found yourself.

@ez230z 14 дней назад

Linus, the spectrograms were interpreted incorrectly. The spectrograms you showed were more than likely aliasing, or wrapping, in the frequency domain. A big tell is the repeating zigzag patterns. You'd need a wider bandwidth in your spectrum to capture the actual signal, assuming that it is a continuous waveform. Try doing a fft on a longer record length to produce a single spectrum. My gut feeling is that there is in fact, a strong low frequency signal, in addition to different harmonics that resonate with mic membranes.

@TheJakeblake 14 дней назад

The Linus from the UPDF ad is yet another Linus Snapshot 🤣

@MiaWinter98 15 дней назад

I feel Elijah, I myself can hear a lot of frequencies most people can't, so I suffer around cheap tech or soon-to-fail stuff. That thing must be hell to listen to

@Scarlet_Soul 15 дней назад

Chargers go eeeeeee

@jetardeshna3449 15 дней назад

@@Scarlet_SoulOh yeah the cheap Chinese ones absolutely do

@KyriosHeptagrammaton 15 дней назад

@@Scarlet_Soul I seen my mom's set-ups and said "What's wrong with your charger" And she's like, what it's fine. Mom, it sounds like it's going to explode.

@MrHXCPancake 15 дней назад

Wow you're so unique and cool

@osniko 10 дней назад

@@MrHXCPancake ok

@MrBogdanel1285 15 дней назад

From the waveform, it does seem to cover the real signal well. But that’s not very important. Did you guys try to do a Fourier Transform to see if you can filter out the jamming and reconstruct the actual speech?

@yourm5732 15 дней назад

I’d love to see the results of having three or four of these devices spread throughout a room. That could eliminate the issues of microphones being at the 45/90 angle to the single device.

@Jaylou88 11 дней назад

This video reminded me that my very common house plant, Cactuar, is due for its yearly watering. Thanks LTT 🙂

@labbiee 15 дней назад

The new lumafield scans are so nice in these videos!

@hollis1223 15 дней назад

How would it sound to someone wearing hearing aids? I wear them and if this affects microphones, I imagine that I would be able to hear it then

@crystalsoulslayer 13 дней назад

I've often wondered whether the dropoff in ability to hear high-frequency noises is entirely natural or if it's caused at least partially by constant exposure to CRT whine. I was quite sensitive to that noise and avoided it more than most people, and I can still hear pretty high-frequency noises at 32. I expect being in a room with that thing would be _very_ unpleasant for me.

@ThatGuy-wj9pr 8 дней назад

This was a great video. Informative and funnier than normal. Thanks!

@BasedPotato403 15 дней назад

you should look at the speech jammer made by Benn Jordan its very interesting and its similair to how this works in the way that we cant hear it but microphones can as it covers the whole spectrum

@RickyDonker 15 дней назад

This was a really great video guys, great production, super cool effects/visuals/ideas/jokes and all the beats where they should be! Love it!

@ImARichard 15 дней назад

Has linus always had the Riker sitting down stickers on his laptop? I need those in my life.

@marsaustralis6881 15 дней назад

I'm not sure if it's my tinnitus or what, but I can still hear the higher-frequencies, whether it's ultrasonic speakers (those fancy "only you hear it" speakers used in some museums or novelty tech) or a CRT TV being turned on a room away and a wall between.

@iMadrid11 15 дней назад

Mr. Robot used a similar device to avoid being recorded when they knew the room is being bugged.

@theColeHardTruth 15 дней назад

Could these cause hearing damage? It still vibrates your eardrums right? You just can't hear it?

@wingracer1614 15 дней назад

Possibly. Hard to say without knowing exactly what it's transmitting and at what power level. But yes, that is a possibility.

@falsemcnuggethope 15 дней назад

possibly, even if you don't even hear it. And then you don't know to exit the room.

@creativecraving 15 дней назад

2:55 Reading between the lines here (4:40, my theory was confirmed!), I'm guessing it pulses ultra high frequency sounds with frequency of the pulses being much lower. Then, when the microphone "recovers" from each pulse, it's at a frequency we can hear, so we hear the diaphragm flapping. If so, they could even vary the pulse frequency to target different frequency of human hearing. I bet I could make a jammer audio clip using a DAW!

@CobraFat2000 13 дней назад

I wonder. The noise introduced is not random, but has the regular patterns. If it's not clipping the thresholds of microphone - maybe the noise pattern can be just picked up from moments of silence and then just subtracted from the resulting sine wave in post... Theoretically?

@pompomaddons 15 дней назад

we are getting raided with this one!🔥🗣️🥶🥶

@SP4CEBAR 15 дней назад

I love the usage of the lumafield scans

@brandoncharley3070 13 дней назад

Did you try filtering out the noise after the fact at all? I get that the mics probably wouldn't pick up speach through the disruption, but since the disruption is such a uniform noise it would be interesting to see what you get with the sort of denoising tools used for editing air conditioners and commercial aircraft out of audio clips.

@lmaoroflcopter 13 дней назад

Nice demonstration of loss of signal with cross-polarisation on the sanken mic.

@ELA1ization 15 дней назад

8:05 It's really hard to determine what is 'funny production' and what is actual device performance in this video.

@LinusTechTips 15 дней назад

Every instance of jammed audio is a real recording. I flipped the switch when Colin started stalking. - LS

@JTCF 15 дней назад

For those who suggest a use for this thing: some people do hear them and can hear them a lot. Putting something like this in a public space would risk health of many people, this could be illegal. Otherwise the science behind this thing is pretty cool.

@falsemcnuggethope 15 дней назад

It may damage a person's hearing even if they can't hear the sound. There's only a little scientific evidence of this, but if it's the case, the person wouldn't even know to protect themselves.

@zaydabbas1609 13 дней назад

This is the same jamming technique cheap RF jammers use. It’s not about frequency nonlinearity, but gain nonlinearity. An input tone that is too high will push the amplifier gain into the compressed region (instead of the linear region), leading all normal signals to be attenuated

@liarus 15 дней назад

Lol, i'm glad you guys mentioned the Elijah case, it's not because you can't hear it that it can't damage your ears, same goes for lazers that you can't see

@wrth 15 дней назад

“it’s legal” famous last words

@abb0tt 15 дней назад

It’s legal…for now 😢

@manitoba-op4jx 15 дней назад

it's legal until the government decides they can record you without consent.... oh wait that happened 40 years ago

@Stonehawk 15 дней назад

Classic Canadians: It's never a war crime _the first time!_

@Tennosoul 15 дней назад

Hey great timing I was just searching video for a dinner

@Nov1cegg 15 дней назад

Cheers, i was searching one to have lunch

@daniwalmsley611 15 дней назад

^raises a glass* to the LTT dinner party

@orlagh277 15 дней назад

you shouldn't eat videos for dinner bro, they don't really have any nutritional value.

@yom35 15 дней назад

have good dinner bro hello

@TreasureHoardingDungeonDwarf 15 дней назад

@orlagh277 Has a point, I heard the portions they serve are byte-sized... Edit: I'll see myself out now.

@juancisneros725 15 дней назад

It would have been interesting to see how it sounded with each microphone

@skyfighter_64 14 дней назад

4:40 the jamming pattern seems to be predictable, I'm curious if the noise could be removed in software afterwards.

@charliesretrocomputing 15 дней назад

That would hurt my ears SO bad, I can hear 20kHz, I guess I'm a "superhuman"!

@Tehn00bA 15 дней назад

Until you get old, that is...

@charliesretrocomputing 15 дней назад

@@Tehn00bA true 😂

@ohioplayer-bl9em 15 дней назад

For now. I can’t hear the thermometer beeping when it’s finished now

@MrHXCPancake 15 дней назад

Lying in the Internet is fun

@charliesretrocomputing 15 дней назад

@@MrHXCPancake i'm SLIGHTLY lying... comment edited to be 100% true

@dreadlock17 15 дней назад

I forgot how much of a menace beardless Linus could be

@sjoerdadlp 13 дней назад

Actually it's pretty amazing how well this thing seems to work. You expect kind of nothing from Aliexpress but this would work in many situations. Even just as an 'additional layer of protection' for secret meetings. It's not failproof sure, but this combined with already existing measurements would be an incridible extra to have. They seem to have put a lot of work and thought into it, impressive.

@Robert08010 10 дней назад

Try this in a home with dogs and watch the reaction. You will find out really quickly that it's not for home use. And with more and more people having "service dogs" in the workplace, this wont be suited for there either. As to how it works, I suspect its not a beat frequency that you are hearing in the recording, but rather it's the sound of distortion in the mic element. It was a very smart move thinking of the large diaphragm mic. I hadn't expected that. But I did expect limited effect with the lav simply due to proximity. If the mic is close enough to your mouth and the jamming device far enough away, if still might be possible to cancel out or filter out the sound of the jammer. It HAS to distort the diaphragm all the way in order to block your audio. If it only moves the diaphragm half way, its likely that audio can be recovered.