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goodpoints · 08-15-15, 09:44 AM

I know at least the "distorted" and "high pitched" tracks are recorded from the SONAR station on the surface ship , NOT from the target submarine. (hence the jumpy rhythm you hear, that's the ping, then the echo off a close range target) Here's the full recording that the clip comes from: http://www.hnsa.org/wp-content/uploa...07/track30.mp3 Most sonar recordings I've heard seem to also be recorded from the transceiver end. Also note that the sound is not the actual pulse by itself, but the sound the operator is hearing from the speakers, the emissions are at the very high end of the human hearing spectrum (16-24 KHz) and are blended with a lower frequency tone, while retaining the other properties of the original pulse/echo, through a process called heterodyning to provide the audible aid to the operator (that's all the characteristic noise itself is, an aid) see: http://www.maritime.org/doc/sonar/chap7.htm for technical info on receivers

The same sequence recorded from the target sub: http://www.hnsa.org/wp-content/uploa...07/track32.mp3

Granted, there's no indication of the range those pings were recorded at (or what kind of coating it has), but it's definitely much more subtle. (though potentially just as unnerving) Most of that sound I believe would originate from the harmonic resonance of the sub rather than the actual pulse.

I'm curious where you found the booming one, though it still sound like the transceiver end, as well as likely synthesized (not that there's anything wrong with the later since I doubt there's many actual recordings, but it should at least sound like it's heard from the correct end)

Here's something interesting though, a recent recording of the active sonar transceiver on board the restored USS Lionfish: That could be used (or serve as inspiration for synthesis) for the ranging and depth ping on the U-Boats if there's no recording or info on what the German transceivers sounded like. note: if you do search for that, I'm almost 100% sure every one of these http://www.uboataces.com/ref-sonar-sounds.shtml are fake.

08-15-15, 09:44 AM	#27
goodpoints Watch Join Date: Aug 2015 Posts: 30 Downloads: 87 Uploads: 0	I know at least the "distorted" and "high pitched" tracks are recorded from the SONAR station on the surface ship , NOT from the target submarine. (hence the jumpy rhythm you hear, that's the ping, then the echo off a close range target) Here's the full recording that the clip comes from: http://www.hnsa.org/wp-content/uploa...07/track30.mp3 Most sonar recordings I've heard seem to also be recorded from the transceiver end. Also note that the sound is not the actual pulse by itself, but the sound the operator is hearing from the speakers, the emissions are at the very high end of the human hearing spectrum (16-24 KHz) and are blended with a lower frequency tone, while retaining the other properties of the original pulse/echo, through a process called heterodyning to provide the audible aid to the operator (that's all the characteristic noise itself is, an aid) see: http://www.maritime.org/doc/sonar/chap7.htm for technical info on receivers The same sequence recorded from the target sub: http://www.hnsa.org/wp-content/uploa...07/track32.mp3 Granted, there's no indication of the range those pings were recorded at (or what kind of coating it has), but it's definitely much more subtle. (though potentially just as unnerving) Most of that sound I believe would originate from the harmonic resonance of the sub rather than the actual pulse. I'm curious where you found the booming one, though it still sound like the transceiver end, as well as likely synthesized (not that there's anything wrong with the later since I doubt there's many actual recordings, but it should at least sound like it's heard from the correct end) Here's something interesting though, a recent recording of the active sonar transceiver on board the restored USS Lionfish: That could be used (or serve as inspiration for synthesis) for the ranging and depth ping on the U-Boats if there's no recording or info on what the German transceivers sounded like. note: if you do search for that, I'm almost 100% sure every one of these http://www.uboataces.com/ref-sonar-sounds.shtml are fake.