Thats also my understanding Hitman, but that clear, well defines 1khz ping that is
found in all the mods I have tried is certainly not correct.

This discussion let me know why ping is not a 3D sound in SH3. (But no sound volume change based on distance is really sucks). And I guess in stock SH3 game you can not hear ping from hydrophone. (What you heared ping is just as in Command Room)

sonar echo.
 

Exactly. What someone hears in the submarine is not the carrier frequency (it is the information-HF) but the transient frequency (which brings the wave to the target and back-LF). The compilation is called modulation. Also the doppler (if the submarine shows movement along the bearing) increases or decreases the LF.
Modern sonars, when they are operated like WW2 era, sound like a hammer hit agaist a steel block BUT NOT as a hit against the pressure hall. If the rest water mass is quiet and the contact approaches, then it sounds very clear and is less absorped and vice versa. Some times, it seems to me like a huge bubble colapsing in sound!

The alternation of the interval is an indication but not a certain one.

So is it possiable to even get the real pinging noises.:D we dont even have a recording.:-?

Just found I missed ridgewayranger's post.

So it's clear. The sound we heared in Command Room in game should be heared from hydrophone earphone and what we can hear in Command Room should be a click/squeak not the sound we heared now. And the sound should be heared in hydrophone we can not hear it based on hydrophone bearing and distance in game. Why we can hear it at sonar station is because SH3 play it same way as in Command Room.

Can we hear sonar ping just like hearing ship propeller?

I've never actually tried but when you are being pinged is it audable from the exterior of the boat?:)

no.. you only hear your officer voice telling you "enemy is pinging us!" :huh:

I don't think so. The hydrophones are good at picking up sounds, but the ping is still ultrasonic, so even with the hydrophones I don't know if you'd hear it. The ones the sonarman on the sending ship hears is through a device that sends and recieves those signals.

Yes, you are right. I misunderstand the ridgewayranger's post. What he said is the movie ping sound is from DD's sonar station speaker. We don't know does the u-boat's hydrophone using heterodyning to receive the ping ultrasonic or not. And since the u-boat sonarman does not know the exactly DD's ping ultrasonic frequency before he detect it. May be there are no heterodyning method to detect the ping ultrasonic in u-boat.

And if there are no heterodyning on hydrophone. Since the hydrophone have a sound amplifier. The sonarman of u-boat still can hear the ping early than other crews. But the sound may be some different since the passive vibration by ultrasonic pulse if not from entire hull but from hydrophone mechanism structure. And the sound may be change while hydrophone change direction, but the sound volume may be not change as much as hearing other sound.

And if the game implement the sound level meter of hydrophone. I guess it should response to ultrasonic pulse.

ASDIC
 

For the given frequency range what practically happens is this:

When the emittion takes place at great distancies (...) you can hear a very weak "click" comming from sonar operator's headphones. From the headphones themselves the sound is clear that it is an emition like I discribed in my previous post. Meanwhile hardly you can hear anything from the CIC. When the contact approaches (...), the sound gets even more clear, also by naked ears inside the CIC and you don't need headsets for that.

Generally speaking if just the sonarman is able to listen the emittions it is unlikely that the sub has been detected except if the sound reaches a "convergence" zone in the water, or a "surface duct" (for bow sonars). But both phenomenas, require medium or low frequency sonars to maintain enough energy along the path and back and certainly it is very difficult for sonars 16-24kHz. So, I believe in SH3 if we make pinging heard only from sonar man this should mean that the submarine is not detected. If someone can hear the pinging from the CIC, then the sub could have been detected or not.

The detection distance of a 16-24kHz sonar has to be very limited because of absorption. It is more likely that ASDIC operated at lower frequencies (10-14kHz,less :down: seems more logical), but I don't have any input from google!

The lowest frequency I have a good ww2 source for is 11Khz, but that was on a
sonar buoy in a harbor entrance.

In all the books I've read on the subject the men have always described the sound as..."a hammer hitting the hull" or..."the sound of pebbles or gravel hitting the hull" or again... "the sound of a steel hazer or cable being dragged aginst the hull!"
Due to depth, water tempreture, sea conditions and season I should imagine that all might apply.
In my mod (no spamming, I promise, I am just trying to make a point,) I attempted to reproduce the effect/impression of a high energy beam hitting the hull!
I hope I have conveyed that impression.
I must say the ping sound now sounds phoney to me.
KUrtz.

Attention Ktl_KUrtz
 

Ktl_KUrtz,

I stumbled across some very good sonar sounds on sounddogs.com. Let me know what you think :hmm: . The gravel/pebble & the hammer sounds are probably authentic :yep: . http://hosted.filefront.com/UberTorpedo :)

cheers

I like the BritishAsdic mod a lot Kurtz, the sonar hit is much more scary, and sounds like it is described by others in this thread. Like a heavy hammer hitting the hull. One question though, the sound cuts kind of abrubtly at the end, with all three sonar wav files, was this intentional?
Also I'm guessing sonar_coat.wav files are the ones you would here if you had the sonar coating upgrade?

Thanks for the mod, IMHO it adds to the immersion. :up: