Ping....... Ping..PingPingPingPing

Captain Birdseye · 07-19-09, 04:55 PM

Can someone explain to me how this sound was audible in the U-Boat?

I don't think I fully grasp Sonar, and wonder how U-Boat crews could hear the ping of the sonar inside the boat with no headphones?

tomfon · 07-19-09, 05:34 PM

Hi.

I think you can find enough information here: http://uboat.net/allies/technical/asdic.htm.

There is also this mod, here: http://www.subsim.com/radioroom/down...?do=file&id=42

The latest version is called, "The Real Ping II".

TarJak · 07-19-09, 07:01 PM

Pretty simple physics. SONAR uses a sound transmitted through the water to detect relfections of that sound from objects in the water.

If you are in the water when the sound is made you can hear it.

BulSoldier · 07-20-09, 02:10 AM

Funny i always thought that the sonar uses freqencies(spl?) that are beyond human capabilities to hear.

d@rk51d3 · 07-20-09, 03:49 AM

The "ping" sound effect is more of a Hollywood stereotype. Apparently it actually sounded like pebbles dropping on the hull, or wires scraping along it.

Jimbuna · 07-20-09, 04:59 AM

Quote:

Originally Posted by d@rk51d3

The "ping" sound effect is more of a Hollywood stereotype. Apparently it actually sounded like pebbles dropping on the hull, or wires scraping along it.

Only when 'hitting' the submarine.

http://www.uboataces.com/ref-sonar-sounds.shtml

TarJak · 07-20-09, 06:50 AM

Quote:

Originally Posted by BulSoldier

Funny i always thought that the sonar uses freqencies(spl?) that are beyond human capabilities to hear.

ASDIC used frequencies between 14 and 22 kilocycles at the upper end of human hearing. Each ship using ASDIC had to use a different frequency to avoid detecting each others return signals. 20 Kilocycles is considered at the very upper limit of human hearing for signals of normal intensity (human voice spoken normally), in air but the density of water changes the upper limit somewhat along with the fact that ASDIC pings had to be reasonably loud to carry up to 2km from the transmitter and get a return signal, so those ships using 22Kilocycles would have been almost impossible to hear but those below that range were certainly audible.

Most of the recordings that exist today of ASDIC are from the operator's console aboard an escort ship fo some kind. I've not found one that was recorded aboard a WWII submarine that was being pinged but it would be interesting to hear the difference.

This excellent article covers some of the issues raised here: http://jproc.ca/sari/asd_gen.html

According to the Maritime Musem of Liverpool this is a recording of an ASDIC capable ship approaching and passing over a target: http://www.liverpoolmuseums.org.uk/m...dio/asidic.mp3

BulSoldier · 07-20-09, 07:12 AM

Well another question then . DId the submarine crews had any other way to find out that they are being pinged apart from hearing the ping ?
If there are no other ways i find it rather strange why not all asdic equiped ships dont use freqencies that couldnt be heard.

07-19-09, 04:55 PM	#1
Captain Birdseye Watch Officer Join Date: Feb 2009 Location: Sat behind my desk at BdU tapping away on my Enigma machine. Posts: 339 Downloads: 44 Uploads: 0	Ping....... Ping..PingPingPingPing Can someone explain to me how this sound was audible in the U-Boat? I don't think I fully grasp Sonar, and wonder how U-Boat crews could hear the ping of the sonar inside the boat with no headphones?

07-19-09, 05:34 PM	#2
tomfon Grey Wolf Join Date: Jan 2008 Location: CK7662 Posts: 918 Downloads: 178 Uploads: 4	Hi. I think you can find enough information here: http://uboat.net/allies/technical/asdic.htm. There is also this mod, here: http://www.subsim.com/radioroom/down...?do=file&id=42 The latest version is called, "The Real Ping II". __________________ "I would rather have questions that can't be answered than answers which can't be questioned." - Richard P. Feynman [1918/1988] "I've missed more than 9000 shots in my career. I've lost almost 300 games. 26 times, I've been trusted to take the game winning shot and missed. I've failed over and over and over again in my life. And that is why I succeed." - Michael Jordan "You don't even care. That's how much an impact the three-point shot has and it's evidenced by how everybody plays... There's no basketball anymore, there's no beauty in it. It's pretty boring. But it is what it is and you need to work with it." - Greg Popovich Mods for SH3

07-20-09, 02:10 AM	#4
BulSoldier Samurai Navy Join Date: Oct 2007 Location: Burgas/Bulgaria Posts: 550 Downloads: 40 Uploads: 0	Funny i always thought that the sonar uses freqencies(spl?) that are beyond human capabilities to hear. __________________ By the hour !

07-20-09, 07:12 AM	#8
BulSoldier Samurai Navy Join Date: Oct 2007 Location: Burgas/Bulgaria Posts: 550 Downloads: 40 Uploads: 0	Well another question then . DId the submarine crews had any other way to find out that they are being pinged apart from hearing the ping ? If there are no other ways i find it rather strange why not all asdic equiped ships dont use freqencies that couldnt be heard. __________________ By the hour !

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07-19-09, 07:01 PM	#3
TarJak Fleet Admiral Join Date: Jul 2006 Location: Sydney, Australia Posts: 17,052 Downloads: 150 Uploads: 8	Pretty simple physics. SONAR uses a sound transmitted through the water to detect relfections of that sound from objects in the water. If you are in the water when the sound is made you can hear it.

07-20-09, 03:49 AM	#5
d@rk51d3 Sea Lord Join Date: Sep 2006 Location: Adelaide, South Australia Posts: 1,952 Downloads: 207 Uploads: 0	The "ping" sound effect is more of a Hollywood stereotype. Apparently it actually sounded like pebbles dropping on the hull, or wires scraping along it.