Thanks for all the info.
After reading up on various hydrophone designs I am going to try
using a 1" deep well socket from my auto repair tools as the piezo
body. This will be a shallow water design and I am sure that there
are a number of things that I have not considered yet that will come
up.
Rich
--- In Gianni Pavan <>
wrote:
> for cheap, tough good, hydrophones look at
www.cetaceanresearch.com. Ask to
> Joe Olson if you need tips about building simple hydrophones.
>
> stridulation is the typical sounds produced by some insects that
use to rub
> a "plectrum" on a "pars stridens", that is a surface covered with
thin
> ridges, to make sound. Often the plectrum moves back and forth on
the pars
> stridens. In such a case the sound is a double chirp with pulses
having
> opposite phases, according to the movement of the plectrum.
> In some cases the contact in only during one movement and this
produces
> chirps that have pulses with the same phase, separated by longer
gaps to
> allow the plectrum move without producing sound.
> On http://www.unipv.it/cibra/insec.html you can see spectrograms
just about
> this topic (ants and beetles).
>
> I'll add sound samples.
>
> Gianni
>
>
>
>
> At 22.24 21/06/2004, you wrote:
> >--- In Gianni Pavan <>
> >wrote:
> > > Hi Rich,
> > > I don't understand what is your goal. Just to have a
> >sensor to
> > > detect their movements or are you interested in their
communicative
> >sounds ?
> > >
> > > In the past I recorded many species able to stridulate.
> >
> >My goal was actually to understand piezo pickups more than I
> >currently do. I am on the road to building a decent hydrophone
which
> >I can not afford so need to read and experiment. So after wiring a
> >piezo direct to a mic input that Rob gave me from his junk box I
just
> >walked around listening to everything from car engines to
> >refrigerators.
> >
> >I am interested in ant communicative sounds but was just surprised
to
> >detect what I can not hear. And the word "stridulate" is actually
> >new to me as well. I have some reading to do for sure. Thanks for
> >the offer and may take you up on it when I get the basics behind
me.
> >
> >My condensor mics don't seem to be able to pick this ant up and I
> >stoped at a 22,000 sample rate because I figured I would need a
small
> >mp3 or no one would bother.
> >
> >I have not posted to the equipment list of members here either
> >because all I would have to say is I own an extensive junkbox in
> >which "stuff" has either been modified or is about to be. So I
guess
> >my equipment list would be mere stridulations.
> >
> >Rich
> >
> >
> >
> >
> >"Microphones are not ears,
> >Loudspeakers are not birds,
> >A listening room is not nature."
> >Klas Strandberg
> >Yahoo! Groups Links
> >
> >
> >
> >
>
> --------------------------------------------------------------
> Gianni Pavan
> Email
> Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
> Universita' degli Studi di Pavia
> Via Taramelli 24, 27100 PAVIA, ITALIA
> Tel +39-0382-507874
> Fax +39-02-700-32921
> Web http://www.unipv.it/cibra
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