RFB hydrophone sounds for SH3 (heavy metal version).

A quite interesting paper about construction, frecuencies, history and schemes on GHG "Some hardly known aspects of the GHG, the U-boat’s group listening
apparatus" by Arthur. O. Bauer, Having consulted to ex GHG operators and so.

Give it a read !

here

http://www.cdvandt.org/GHG1996.pdf

Cheers


P.S., btw this document comes from Foundation for German communication and related technologies(History of Technology)

http://www.cdvandt.org/

where scrolling down you will see a miriad of interesting documents on radar, radio, sonar and the like, many from WW2 era, and some referring U-boat

Enjoy!

[karamazovnew]

Pavel, I hope you like them. As you can see those are all the hydrophone sounds and the corresponding surface sounds, so merging them with any mod is possible, depends on which you want to place on top .

Steve, I hope they're fun enough for you .

Nictalope, amazing link, those schemes almost make me dizzy

Originally Posted by karamazovnew

Nictalope, amazing link, those schemes almost make me dizzy

:rotfl: absolutely true


Nonetheless is interesting note some simple facts:

* That GHG worked in 4 fecuencies and which used most were 3 khz and 6 khz
* "Average merchant ships, cruising at 12-13 knots, produced a maximum sonic spectrum at . 100
Hz and only 10% at 4 kHz. For destroyers cruising at 15 knots, the maximum sonic spectrum
was at . 200 Hz, but still supplying 30% of its harmonic spectrum between, 4 kHz and 8 kHz.
Thus the proportion of sonic signal level left at the higher harmonics, had to be compensated for
by increasing the amplification gain."
* Necessary depth for listening usually improved greatly @ 20 meter (best @ 50)
* "The electrically powered underwater boats had to reduce their speed to a few knots only (< 3 knots). If they were submerged and powered by a Diesel engine, in combination with a 'Schnorkel', the engine(s) had
to be completely switched off. Because the standard GHG system proved unable to receive sonic information adequately, when the submarine was sailing submerged (because of the use of the schnorkel the U-boat had to steer just under the interfering water surface)."
* At Maass's proposal, a group of hydrophones were integrated into a newly constructed hull,
placed in front of the lumber keel. This modification was successfully tested in U-194 in
February 1943. One of the improvements was the Balcony hydrophones were maintained at a 2.5
m lower level and thus were less vulnerable to many sorts of hampering interference.


So mods i guess could be developed on these notes, provided they're interesting enough to make them work. The main cfg files must be worked, i take it?

Anyway, in case passed unsuspected, i've worked a bit on hydrophone ship sound, had some recordings from several types and reworked them from skratch as accurately as I could, though i've kept some bass (you're absolutely right, karamazovnew, on the lack of bass thing on those years' equipment ) but is swallowed away on distance anyway. Mod is here :

http://www.subsim.com/radioroom/showthread.php?t=153138

Can't tell if anyone tried this one
As i experienced in GWX-ed SH3 had to slow down speed almost to a full stop in order to get a 14km faint sound from ships and sonar op doesnt tell you a damn bout those sound while surfaced ( a good GWX fix, i take?), but still no too keen on those far away while submerged.

Cheers

[karamazovnew]

Nictalope, I went through your mod just before starting on mine . The sounds are very good for the standard SH3 surface sounds. I did go through the US Sonar User Manual that explained all the knobs and the procedures, a very interesting read. It just reminded me what could be achieved if we were allowed to script the game ourselves.

As it stands, depth doesn't have any change on sounds in the game. As soon as you hit the surface, the sounds start. This annoyed me terribly when traveling thorugh storms and the waves smashed into the hydros whithout causing sound. Speed also has no effect on any sound. Only your engines raise the volume (and pitch) of the sub sound. In other words, moving water around the hydro doesn't make any sound. Going at 8 knots flank then cutting the engines will instantly cut the noise, which may or may not be realistic. Maybe SH5 will adress these issues and implement each knob and phisical effect and save the world from hunger, bring peace and make women feminine again...

But until then, this mod does what it's supposed to, make you rely more on your watch crew and be more forgiving to your soundman. If you can find any sound samples from real german subs, I'd be very very interested in having them in SH .

[PavelKirilovich]

Originally Posted by Karamazovnew

Going at 8 knots flank then cutting the engines will instantly cut the noise, which may or may not be realistic.

Isn't. Actual speed, not indicated speed is the determining factor in flow noise. Having your sensor in a current makes the problem worse. No chance of simulating that in SH3/4/5.

Originally Posted by karamazovnew

Nictalope, I went through your mod just before starting on mine . The sounds are very good for the standard SH3 surface sounds. I did go through the US Sonar User Manual that explained all the knobs and the procedures, a very interesting read. It just reminded me what could be achieved if we were allowed to script the game ourselves.

...

But until then, this mod does what it's supposed to, make you rely more on your watch crew and be more forgiving to your soundman. If you can find any sound samples from real german subs, I'd be very very interested in having them in SH .

Well, thanks, and of course i will track down some u-boat recording, provided there is some around the net.

I guess we shouldn´t stop until we're able to smell the sea breeze from our monitors :rotfl:

Cheers

[karamazovnew]

Originally Posted by Nictalope

I guess we shouldn´t stop until we're able to smell the sea breeze from our monitors :rotfl:
Cheers

That has got to be the best motto of the Silent Hunter modders .

[orbiter28]

Thx for your sound mod, in fact it's a great mod: lot nof sound, good thing (as torpedo dud hyd) and realistic sound.
Thx a lot