Ok it jams sonar, but you don't need sonar if the target is making a noise, you just listen, don't you?
I couldn't read the full paper but the abstract didn't mention that they were going to discuss how the jamming worked
I couldn't read the full paper but the abstract didn't mention that they were going to discuss how the jamming worked
https://www.researchgate.net/publication/26676734_Tiger_Moth...
Besides the fact that the sonar is needed for accurate ranging, as mentioned by another poster, these moths produce their sounds in response to the bat sonar, so their sounds would not be useful to find them without sonar.
As mentioned in the paper, there are also other kinds of moths which are poisonous and which do not jam the sonar, but which emit warning sounds that the bats learn to avoid.
Other moths also emit sounds, but those sounds do not prevent bats from hunting them, except perhaps for the first few times until a bat learns that those moths emitting sounds are good to eat, so their sounds do not have a jamming effect.
Sending a signal that resembles the echo pulses will skew the spectrum and confuse the listener.
In theory that information can be used to triangulate the "jammer" if you could measure the small difference in time from receiving in left vs. right ear but that's not how mammal brains process auditory signals.
So it's not like sonar in submarine warfare with hydrophone arrays and digital signal processing.
There's no way humans can tell the time difference of about 50 microseconds between hearing with your left and right ears. If you have research to prove otherwise, I'm all ears (pun intended).
You can also easily tell the difference of sound coming from directly ahead vs behind despite the ears hearing the sound simultaneously.
There is a lot of research into psychoacoustics in the past few decades. And pretty cool demos where directional audio is generated on headphones by altering the frequency spectrum between left and right ears.