I wasn't a sonar guy, but I used to work in the forward gyro room, so this was a familiar sound. It's a funny feeling, I feel like I've been transported back in time 20 years.
Thank you for uploading this video. Modern active sonar recordings are difficult to come by... presumably due to certain existing recordings being unavailable to the public. When recordings are available, though, they are always fascinating.
in the 90s we would make the 53c SING! Not just a few "pings" here and there like this - but literally hitting scores of notes progressing through several ranges usually climbing. I am pretty sure they almost totally ban most of this now since the whales dont appreciate it and try to get to dry land for safety when this is around. I think you're hearing a fraction of what this system is capable of or how it was operated in the heyday
@Hunter Kirsch Depends on the decibels being put out, but in one case a diver who was 160 kilometers from a sub with it's sonar pinging felt his lungs vibrate, if I remember it correctly. A youtuber named Mr Slav did a great video on sonar pings.
Active sonar sounds very different that I thought, I mean, I was thinking about one loud ping and that´s all. But as always, in reality things are more complicated.
The sound you were imagining is more inline with what the older more simple WW2 active sonar pings sounded like. As submarines became more advanced and harder to detect throughout the Cold War, Sonars had to evolve to keep up.
I'm here from game, called "Barotrauma". There's mod, called "Real Sonar", and even the players don't wan't to hear this, 'cause you literraly feel that yours ears are bleeding and, eventualy, your character will die soon hearing after that sound. Thanks for this record.
@@GodlyGaming96 yup, if you were anywhere in the range of 1km near active sonar you wouldn't survive much long, and if you were really close to it you would have absolutely zero chances of not dying gruesomely
@@kurushimee Oh I just clutched, that's all. I survived. My head did go boom but it got stitches back together again. The brain stayed the same though which is good👍
@@jakubgrygiel9795 The navy uses active sonar to kill or disorient divers. An active sonar ping, especially in a port, can kill you. If it doesn't, your eardrums will burst and there's a high likelyhood you'll have life long medical issues
The strangest part about a sonar's sound is that it pitches up imo. The doppler effect tends to stretch sounds into lower and higher pitches depending on the direction and relative speed of the sound, but sonar? It doesnt appear to be affected; its insane how well the water bounces the sound around, and you can even hear the noise distantly echoing miles away. So cool.
Not a sonar expert but I do have a grounding in accoustics - I suspect it is phase interference from the multiple returns it is listening out for, rather than frequency shifts from any single return, which would be negligible when locating something as slow moving as a submarine - but the phase shift would be a lot easier to detect if the returns are compared with a reference frequency onboard, which the emitting transducer is also locked to via a phase-locked loop, and would allow the ship to build up a picture of what is happening around/underneath it. This is how some radars work, and is also a similar technique to the one your ears/brain use to reliably locate objects in a 3d sound space.
Speed of sound in water in water is basically hypersonic compared to in air. Doppler effect *would* apply (very briefly, before your ship disintegrates!) if you were moving at a couple hundred knots in the water.
@@harrymartin684 The FM sweep you hear is intended to cover multiple CZs and thermal layers with a single emission- allowing for the returns to arrive at a more predictable timing for the computer system to display correctly. You can see the frequency ramping up, level off, and repeating to cover a proscribed swath of depth. Each layer conducts the sound slightly different from the other.
i think for echolocating creatures its somehow like someone shooting suddenly with no warning powerful laserbeams through your eyes, and repeats it over and over....
These amounts of decibels can cause haemorrhage, bursting of lungs and even ripping your skin open (in water cause water can make sound travel easier). Sonars can emmit 230+ db.
I think you're right, I downloaded the audio and looked at it myself and there's a very faint sweep in that 3.3-4 kHz range that seems to return a bit before each next ping. It's pretty hard to see on the spectrogram in the video but the fact that it's always in the same spot makes me think it's indeed something reflecting it from far away.
And they would want to wait for the last return of it before sending a new pulse, if you send pulses too close together then you wont know which pulse the return is from resulting in ramge ambiguities. This can be mitigated by coding each pulse or frequency modulation etc. Its fascinating to me how this is all pretty much the same as Radar, Electromagnetic Warfare, but with sound. Can sonar be jammed like radar? DRFM jamming? Holy crap that's a can of worms!
Is this „coming in“ or „going out“? „Coming in“ would be Interessting, is the ship turning, to Face the Signal, to give less Surface for it to Reflect on? Happy about any Answer 🙌🏼
It should be outgoing. Sometimes you hear a very short "pip" some seconds after the pulse, that might be a return. A ex-US NAVY Sonarman explained it in his YT channel in detail. Channel is called "Sub Brief". The video was taken down, for security reasons I guess.
I've been trying to get clear, high-resolution spectrograms in Audacity, but it seems like they come out as very blurry and indistinct no matter what settings I use. Could you please share what settings you used for this clip? My interest is in analyzing human voices.
if you heard that underwater props to you for surviving but like good luck because a sound that loud your uhm pretty dead and if somehow your not dead youll most definetly drown from all the horrible stuff you justy heard but on the bright side you didnt hear an SQS-26
Id love to understand the purpose of each part of the signal, like what is that fainter reflection of the signal in a higher freq range? Is that a harmonic of the sound being generated or the recording of it or just an artifact in the software or something? And the way the sound fades off, is the actual emission from the sonar discrete or does it fade away slowly?
@MattH-wg7ou, the sonar equipment transmits two FMCW pulses and a final CW pulse. FM stands for frequency modulation (the whistles with an increasing pitch) and CW stands for Continuous Wave (the whistles with a constant pitch). FM pulses are used for doppler analysis, and CW pulses enables to pack more power to find more distant targets. One noticeable characteristic of the CW pulse is the gaussian amplitude modulation (the strength roughly follows the shape of a bell curve). This is done on purpose, so the operator can alternate nearby FM and CW pulses in the frequency domain without them interfering with each other (gory mathematical detail without formulas: a discrete event in time domains splatters in the frequency domain, and vice versa. A gaussian function in the time domain stays gaussian in the frequency domain, think of it as a good tradeoff to avoid time or frequency splatters. Alternatively, it can be a triangle in the time domain, which would give a square cardinal sine in the frequency domain, with minimal -even negligeable- undesirable emissions). About the distortion on the first pulse, I'll be unable to tell you if it happened during transmission or reception without at least knowing the mechanical and electrical characteristics of the receiving hydrophone, but there's no reason it would be a software artifact. Regarding the echo, based on the timing (I downloaded the soundtrack and used audacity to extract the timing), with ~150ms, the sonar source and the echo are roughly 220~230 meters-ish apart from each other. I don't have time to waste oversampling the file to pull the doppler shift, and it's not relevant to a third party listener. About the progressive fading that happens, the ocean is a pretty bad echo chamber with multiple modes of sound propagation (have a look to "underwater acoustics propagation" on your favorite image search engine for more details). My best guess is it's the progressive fading of surface waves reflection. Not knowing the exact location of this event nor the hydrophone location nor the angle of arrival of the signals, I can't tell if the echo is an actual contact or the seabed. As a final note: all knowledge in this post it reachable by a person with an engineering degree that actually followed during their signal processing and electromagnetics and RF propagation courses (even though the propagation model characteristics are different, the mathematical laws of underwater acoustics are the same).
@@MattH-wg7ou Radar/Sonar systems don't fall under my main field of knowledge. However, modem design does, and all I can tell is OFDM and FBMC really unlocked the opportunities for underwater data modems. The channel propagation model is quite a bane because of how easy it is for ISI to happen. On the other hand, for somebody courageous enough, it's a heaven because of opportunities brought by MIMO, beamforming and FEXT cancellation through TX vectoring and realtime channel estimation; but I'm diverging here...
![แข่งเพิ่มน้ำหนักใน 24 ชั่วโมง!! [Ver 2025]](http://i.ytimg.com/vi/20xn0g6k-ec/mqdefault.jpg)
the fact this is tens of trillions times quieter than a real ping is terrifying
unfortunately
i'm making a version of this where the sounds are more frequent so I can use it as an alarm
@@germanwarrabbitoh ok thanks
No it's not tens of trillions time quieter than a real ping. It's only quieter by like 31622 times.
@@CorruptedSpider so then there is hope for my alarm
@@germanwarrabbit"I'll either be awake or be a liquid"
I was a sonar tech on DLG-34 in the late '60's. It had an SQS-26BX. One mode we were not to use was PRN, pseudo random noise.
What specifically about PRN that made it off limits?
@@harrymartin684 It was a “random” sequence of pings to improve signal to noise ratio. It could be used against us if the other side recorded it.
@@jselectronics8215 so why release/make available the feature? 😂
@@MuzzaHukka It was to be used only in time of war.
@lapdog5067the enemy submarine would track that sound down and find your submarine
I wasn't a sonar guy, but I used to work in the forward gyro room, so this was a familiar sound. It's a funny feeling, I feel like I've been transported back in time 20 years.
Thank you for uploading this video. Modern active sonar recordings are difficult to come by... presumably due to certain existing recordings being unavailable to the public. When recordings are available, though, they are always fascinating.
in the 90s we would make the 53c SING! Not just a few "pings" here and there like this - but literally hitting scores of notes progressing through several ranges usually climbing. I am pretty sure they almost totally ban most of this now since the whales dont appreciate it and try to get to dry land for safety when this is around. I think you're hearing a fraction of what this system is capable of or how it was operated in the heyday
How long would they have let it 'sing' for? I bet that sounded amazing
@@jessevos3986that natural kind of reverb is so strange so I could only imagine how it playing actual notes would sound 😮😅
I wonder if for underwater creatures, sonar pings are like those dudes who rev their cars or whatever at ungodly hours of the night?
it's a hell of a lot worse
It kills most everything. I think if I human gets pinged your insides like literally explode
I’m not 100% just saying
@@thehunterkirsch I'm pretty sure that sudden extreme hemorrhage can be considered as someone's organs exploding lol
@Hunter Kirsch Depends on the decibels being put out, but in one case a diver who was 160 kilometers from a sub with it's sonar pinging felt his lungs vibrate, if I remember it correctly. A youtuber named Mr Slav did a great video on sonar pings.
Somehow I find this soothing…
The sweeps at 15:20 interest me the most. Probably just testing the equipment.
no its all for different things. bearing, speed that kinda thing. they also change up frequencies to better detect subs
aquaman locking his car
If only hollywood would use this instead of their fake sonar ping sound
They wouldn’t have any movie goers left to watch their movies
Actually it’s not fake it was used back in ww2
@@-CYANIDE-686 yea but they put it for modern vessels
@@michealnyers184 true
@@-CYANIDE-686the *ping* you hear now is used by active sonar torpedos. Nobody knows why they decided to use that.
Active sonar sounds very different that I thought, I mean, I was thinking about one loud ping and that´s all. But as always, in reality things are more complicated.
The sound you were imagining is more inline with what the older more simple WW2 active sonar pings sounded like. As submarines became more advanced and harder to detect throughout the Cold War, Sonars had to evolve to keep up.
I'm here from game, called "Barotrauma". There's mod, called "Real Sonar", and even the players don't wan't to hear this, 'cause you literraly feel that yours ears are bleeding and, eventualy, your character will die soon hearing after that sound.
Thanks for this record.
Active sonar sounds amazing
Man it already hurts my ears with my phone speaker only, I can't imagine underwater 😵
Thank you so much, your channel is amazing !
I used a sound booster and I'm dead. This is was so good man, thanks👍👍👍👍💀💀💀💀💀💀
now imagine being in the ocean while this was happening
@@prakharmishra5487 Oh, yeah I wouldn't be ali-
My brain go brr-- nvm it’s all liquid now ~ ghost me
@@GodlyGaming96 yup, if you were anywhere in the range of 1km near active sonar you wouldn't survive much long, and if you were really close to it you would have absolutely zero chances of not dying gruesomely
@@kurushimee Oh I just clutched, that's all. I survived. My head did go boom but it got stitches back together again. The brain stayed the same though which is good👍
Those sound are extremly unpleasent, I dont dare put headphone.
Absolutly crazy that these sound can kill you underwater if you're in the area
It can't
@@jakubgrygiel9795 its 240db, that would burst your organs and break open your skin, your whole body would hemorrhage
@@jakubgrygiel9795 it does, thats why they turn it off when they work on the warship
@@jakubgrygiel9795 The navy uses active sonar to kill or disorient divers. An active sonar ping, especially in a port, can kill you. If it doesn't, your eardrums will burst and there's a high likelyhood you'll have life long medical issues
@@jakubgrygiel9795 Radar is another one that will kill you. People have been fried before while on active radar masts aboard naval ships
The strangest part about a sonar's sound is that it pitches up imo. The doppler effect tends to stretch sounds into lower and higher pitches depending on the direction and relative speed of the sound, but sonar? It doesnt appear to be affected; its insane how well the water bounces the sound around, and you can even hear the noise distantly echoing miles away. So cool.
It sends out multiple pings in higher pitches to get a better map of whats out there.
Not a sonar expert but I do have a grounding in accoustics - I suspect it is phase interference from the multiple returns it is listening out for, rather than frequency shifts from any single return, which would be negligible when locating something as slow moving as a submarine - but the phase shift would be a lot easier to detect if the returns are compared with a reference frequency onboard, which the emitting transducer is also locked to via a phase-locked loop, and would allow the ship to build up a picture of what is happening around/underneath it.
This is how some radars work, and is also a similar technique to the one your ears/brain use to reliably locate objects in a 3d sound space.
That's not interference,those are echoes from obstacles, probably contact returns
Speed of sound in water in water is basically hypersonic compared to in air. Doppler effect *would* apply (very briefly, before your ship disintegrates!) if you were moving at a couple hundred knots in the water.
@@harrymartin684 The FM sweep you hear is intended to cover multiple CZs and thermal layers with a single emission- allowing for the returns to arrive at a more predictable timing for the computer system to display correctly. You can see the frequency ramping up, level off, and repeating to cover a proscribed swath of depth. Each layer conducts the sound slightly different from the other.
Bruh the dogs a barking tonight. Max volume
ALAAAAAAARM!
ALAAAAAR!
Not much like my old SQS-23 - just a regular old ping! Sonar chief, 1971.
i think for echolocating creatures its somehow like someone shooting suddenly with no warning powerful laserbeams through your eyes, and repeats it over and over....
Yeah poor animals (whales mostly) swim to dry land, just to get away from the sound. Really sad😓
Any recordings of a Russian/Soviet sonar? I've looked all over youtube and can only find SQS-53 vids
Same, let me know if you tind it
11:49 when I heard that ping I was amazed than I died
Thank for the intel
200+ db
These amounts of decibels can cause haemorrhage, bursting of lungs and even ripping your skin open (in water cause water can make sound travel easier). Sonars can emmit 230+ db.
Yep. Your whole body will be ruptured
Am I nuts or is there a super faint return just before the next cycle starts? I can just make out what looks like a reflection of the second FM Sweep
At what time?
@@feelx92ger would've been a brilliant idea if I'd thought to put that when I commented 2 months ago lol, I can't remember where I heard it now.
I think you're right, I downloaded the audio and looked at it myself and there's a very faint sweep in that 3.3-4 kHz range that seems to return a bit before each next ping. It's pretty hard to see on the spectrogram in the video but the fact that it's always in the same spot makes me think it's indeed something reflecting it from far away.
And they would want to wait for the last return of it before sending a new pulse, if you send pulses too close together then you wont know which pulse the return is from resulting in ramge ambiguities. This can be mitigated by coding each pulse or frequency modulation etc.
Its fascinating to me how this is all pretty much the same as Radar, Electromagnetic Warfare, but with sound. Can sonar be jammed like radar? DRFM jamming? Holy crap that's a can of worms!
@@feelx92ger I think I found it. 9:57
any more videos?
Working on it.
@@thesonarhunter 💪💪
sounds nice
What program are you using here for playback?
Audacity
19:30
Is this „coming in“ or „going out“? „Coming in“ would be Interessting, is the ship turning, to Face the Signal, to give less Surface for it to Reflect on?
Happy about any Answer 🙌🏼
It should be outgoing. Sometimes you hear a very short "pip" some seconds after the pulse, that might be a return.
A ex-US NAVY Sonarman explained it in his YT channel in detail. Channel is called "Sub Brief". The video was taken down, for security reasons I guess.
I recreated the same sonar sound in audacity. I dunno if this is the AN SQS 51 or equivalent to that
I feel sorry for the oceanic life
I've been trying to get clear, high-resolution spectrograms in Audacity, but it seems like they come out as very blurry and indistinct no matter what settings I use. Could you please share what settings you used for this clip? My interest is in analyzing human voices.
great 👍
if you heard that underwater props to you for surviving but like good luck because a sound that loud your uhm pretty dead and if somehow your not dead youll most definetly drown from all the horrible stuff you justy heard but on the bright side you didnt hear an SQS-26
Id love to understand the purpose of each part of the signal, like what is that fainter reflection of the signal in a higher freq range? Is that a harmonic of the sound being generated or the recording of it or just an artifact in the software or something?
And the way the sound fades off, is the actual emission from the sonar discrete or does it fade away slowly?
@MattH-wg7ou, the sonar equipment transmits two FMCW pulses and a final CW pulse. FM stands for frequency modulation (the whistles with an increasing pitch) and CW stands for Continuous Wave (the whistles with a constant pitch).
FM pulses are used for doppler analysis, and CW pulses enables to pack more power to find more distant targets.
One noticeable characteristic of the CW pulse is the gaussian amplitude modulation (the strength roughly follows the shape of a bell curve).
This is done on purpose, so the operator can alternate nearby FM and CW pulses in the frequency domain without them interfering with each other (gory mathematical detail without formulas: a discrete event in time domains splatters in the frequency domain, and vice versa. A gaussian function in the time domain stays gaussian in the frequency domain, think of it as a good tradeoff to avoid time or frequency splatters. Alternatively, it can be a triangle in the time domain, which would give a square cardinal sine in the frequency domain, with minimal -even negligeable- undesirable emissions).
About the distortion on the first pulse, I'll be unable to tell you if it happened during transmission or reception without at least knowing the mechanical and electrical characteristics of the receiving hydrophone, but there's no reason it would be a software artifact.
Regarding the echo, based on the timing (I downloaded the soundtrack and used audacity to extract the timing), with ~150ms, the sonar source and the echo are roughly 220~230 meters-ish apart from each other.
I don't have time to waste oversampling the file to pull the doppler shift, and it's not relevant to a third party listener.
About the progressive fading that happens, the ocean is a pretty bad echo chamber with multiple modes of sound propagation (have a look to "underwater acoustics propagation" on your favorite image search engine for more details). My best guess is it's the progressive fading of surface waves reflection.
Not knowing the exact location of this event nor the hydrophone location nor the angle of arrival of the signals, I can't tell if the echo is an actual contact or the seabed.
As a final note: all knowledge in this post it reachable by a person with an engineering degree that actually followed during their signal processing and electromagnetics and RF propagation courses (even though the propagation model characteristics are different, the mathematical laws of underwater acoustics are the same).
(just to clarify, my final note is intended to the feds/mils who were about to freak out with the details I gave, which are, indeed unclassified).
@@thafff dude awesome! Just what I wanted to know, thank you!
@@MattH-wg7ou My pleasure ^^
@@MattH-wg7ou Radar/Sonar systems don't fall under my main field of knowledge. However, modem design does, and all I can tell is OFDM and FBMC really unlocked the opportunities for underwater data modems. The channel propagation model is quite a bane because of how easy it is for ISI to happen. On the other hand, for somebody courageous enough, it's a heaven because of opportunities brought by MIMO, beamforming and FEXT cancellation through TX vectoring and realtime channel estimation; but I'm diverging here...
underwater cave noises💀
minecraft cave sound
Fr
Imagine being a diver and hearing IRL "cave noise" completely out of nowhere 😱