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Re: Unknown biological sound

To: AUDITORY@xxxxxxxxxxxxxxx
Subject: Re: Unknown biological sound
From: R K Moore <r.k.moore@xxxxxxxxxxxxxx>
Date: Thu, 10 Dec 2009 18:00:30 -0000
Approved-by: r.k.moore@xxxxxxxxxxxxxx
Comments: To: Linda Sebastianutto <sebast@xxxxxxxx>
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I just performed some simple signal processing on the sample (specifically some upward pitch shifting in order to be able to listen to the sounds more comfortably), and I found that the result sounded somewhat similar to some ant sounds that I've been working on recently.  In common with many insects, ants 'stridulate' (i.e. rub one part of their body on another), and this gives rise to a rhythmic underlying structure to their calls.  Are there sea creatures that generate sound in a similar fashion?

Roger

_____________________________________________________________

Prof ROGER K MOORE BA(Hons) MSc PhD FIOA MIET

Chair of Spoken Language Processing
Speech and Hearing Research Group (SPandH)
Department of Computer Science, University of Sheffield,
Regent Court, 211 Portobello,
Sheffield, S1 4DP, UK

e-mail: r.k.moore@xxxxxxxxxxxxxx
web:    http://www.dcs.shef.ac.uk/~roger/
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fax:    +44 (0) 11422 21810
mobile: +44 (0) 7910 073631

General Chair: INTERSPEECH-2009 http://www.interspeech2009.org/
________________________________________________________________

> -----Original Message-----
> From: AUDITORY - Research in Auditory Perception
> [mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Linda Sebastianutto
> Sent: 10 December 2009 17:04
> To: AUDITORY@xxxxxxxxxxxxxxx
> Subject: Re: [AUDITORY] Unknown biological sound
> 
> 
> Dear list members,
> 
> Just let me explain a little more in detail:
> Dr.Lennox was right: the clicks were probably due to mic handling,
> moreover I filtered and amplified the sound because it was really soft.
> The sound I want you to pay attention to is the set of very close
> pulses.
> All of the recorded sounds have the same structure: they last few
> seconds (3/4) and they occur "randomly" -one every 10/15 minutes- from
> 2 to 6 a.m.
> The aim of the acoustic survey was to monitor another fish species,
> Sciaena umbra, which made choruses during night in the reproductive
> period (july and august). This misterious sound started right after
> Sciena umbra ended the chorus. I add an image with spectrogram and
> waveform In the same area there are other soniferous fish species:
> maybe this is a new one - or a common one with unknown acoustic stimuli
> :)
> 
> if it is a machine I am curious to know which one produces a sound like
> this: in the survey we must distinguish between biological and human
> sources of noise
> 
> thank you very much
> Linda
> 
> 
>    Quoting "Bruno L. Giordano" <bruno.giordano@xxxxxxxxxxxxxxx>:
> 
> > I have to agree with Peter: I would be very surprised if this was a
> > biological sound.
> >
> > It sounds too regular and sustained to me, although the 21st century
> > man might have developed a mistaken identification bias to survive in
> > a modern jungle of living agents and evil machines, where seahorses
> > (and
> > woodpeckers) are rare and harmless ;-)
> >
> > 	Bruno
> >
> >
> > Jazz wrote:
> >> Sounds like a Sea-horse, But lots of Fish make similar soundsthere
> >> are more to listen to on the websight below
> >> http://www.dosits.org/gallery/fishnbay/15.htm
> >> Jazz
> >>
> >>
> >> http://www.dosits.org/gallery/fishnbay/15.htm
> >>
> >>
> >>
> >> ----- Original Message ----
> >> From: Peter Lennox <P.Lennox@xxxxxxxxxxx>
> >> To: AUDITORY@xxxxxxxxxxxxxxx
> >> Sent: Thu, 10 December, 2009 10:42:15
> >> Subject: Re: [AUDITORY] Unknown biological sound
> >>
> >> There seem to be two sets of sounds - the clicks that sound like
> >> mic handling noise aren't at the end, so I'm not sure if they were
> >> what you were telling me to ignore. They're certainly much closer
> >> to the mic than the other, continuous noise, in fact I think
> >> they're very close.
> >> The other noise - is it definitely animal? - How long was the
> >> noise? - continuous or in short bursts like your sample? - it
> >> sounds rather like a motor - could even be something like a
> >> compressor, transmitting through the hull of a boat. There seems to
> >>  be some reverberation there which I assume results from the
> >> source-mic distance (and certainly it doesn't sound like very deep
> >> water) but it could be be structural reverberation if it actually
> >> came from an object with a rigid body such as a boat.
> >> I'll be happy if you find out what it is!
> >> Regards
> >> ppl
> >>
> >> Dr Peter Lennox
> >>
> >> Director of Signal Processing and Applications Research Group
> (SPARG)
> >> School of Technology, Faculty of Arts, design and Technology
> >> University of Derby, UK
> >>
> >> p.lennox@xxxxxxxxxxx
> >> (01332) 593155
> >> http://sparg.derby.ac.uk/SPARG/Staff_PLX.asp
> >>
> >>
> >> -----Original Message-----
> >> From: AUDITORY - Research in Auditory Perception
> >> [mailto:AUDITORY@xxxxxxxxxxxxxxx] On Behalf Of Linda Sebastianutto
> >> Sent: 10 December 2009 14:43
> >> To: AUDITORY@xxxxxxxxxxxxxxx
> >> Subject: Unknown biological sound
> >>
> >> Dear list members,
> >>
> >> During a nocturnal acoustic survey in shallow waters in the Northern
> >> Mediterranean Sea my colleagues recorded some strange sounds of
> >> unknown origin.
> >> You can find an example in attachment; it is band-pass filtered (50
> -
> >> 600 Hz), and amplified. Please try to ignore the "clicks" at the end
> >> of the sound.
> >> Does any of you have an idea of what kind of animal emits a sound
> >> like this? Maybe a fish?
> >>
> >> Thank you in advance
> >> L Sebastianutto
> >>
> >>
> >>
> >> Linda Sebastianutto, PhD student
> >> Cognitive Neuroscience Sector
> >> International School of Advanced Studies via Lionello Stock 2/2
> >> Trieste - Italy
> >>
> >> email: sebast@xxxxxxxx
> >> tel: +39 040 3787604
> >>
> >>
> >>
> >>
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> >>
> 
> 
> 
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