I've just recorded some crickets outside tonight. When I listen to
(and look at) the recording, there are some chirps above 10kHz. Are
these likely to be bats?? This was recorded at 21:45 tonight in the
Adelaide Hills, South Australia.
I am not an expert on insects or bats, but it sounds to be calling
from a fixed position. Wouldn't a bat be flying around? I'm guessing
insect. Katydid? The mp3 compression you chose cuts off the peak
frequencies of the chirps at 11.9k, a bit higher quality might reveal
some key information.
John Hartog
--- In naturerecordists@yahoogroups.com, "John Tudor" <john@...> wrote:
>
> I've just recorded some crickets outside tonight. When I listen to
> (and look at) the recording, there are some chirps above 10kHz. Are
> these likely to be bats?? This was recorded at 21:45 tonight in the
> Adelaide Hills, South Australia.
>
> http://tinyurl.com/9b4ze8
>
> Regards
> John
>
--- In naturerecordists@yahoogroups.com, "John Hartog"
<hartogj_1999@...> wrote:
>The mp3 compression you chose cuts off the peak frequencies of the
>chirps at 11.9k, a bit higher quality might reveal some key
>information.
Hi John,
128bps still cuts of the peaks - now at about 15.9K. The reason I was
wondering about the peaks is because while browsing species on the
Singing Insects of North America website (http://buzz.ifas.ufl.edu/),
I noticed "peak frequency" is used in identification.
Is there is an online resource for songs of insects found in Austrailia?
John Hartog
-- In naturerecordists@yahoogroups.com, "John Tudor" <john@...> wrote:
>
> --- In naturerecordists@yahoogroups.com, "John Hartog"
> <hartogj_1999@> wrote:
> >The mp3 compression you chose cuts off the peak frequencies of the
> >chirps at 11.9k, a bit higher quality might reveal some key
> >information.
>
> Here is one at 128k bit rate
>
> http://tinyurl.com/8ggvcd
>
> I don't think they're as stationary as they seem. They are moving about.
>
> Regards
> John
>
The peak frequency is the frequency at which the most sonic energy is
produced for said species. It is not the maximum frequency that the
species can produce as that is well above the equipments upper limit
for a number of species.
I hope that this helps.
Wil Hershberger
Nature Images and Sounds, LLC
Hedgesville, WV
The Songs of Insects
My Blog
On Dec 27, 2008, at 10:51 PM, John Hartog wrote:
> Hi John,
> 128bps still cuts of the peaks - now at about 15.9K. The reason I was
> wondering about the peaks is because while browsing species on the
> Singing Insects of North America website (http://buzz.ifas.ufl.edu/),
> I noticed "peak frequency" is used in identification.
>
> Is there is an online resource for songs of insects found in
> Austrailia?
>
> John Hartog
>
> -- In naturerecordists@yahoogroups.com, "John Tudor" <john@...> wrote:
> >
> > --- In naturerecordists@yahoogroups.com, "John Hartog"
> > <hartogj_1999@> wrote:
> > >The mp3 compression you chose cuts off the peak frequencies of the
> > >chirps at 11.9k, a bit higher quality might reveal some key
> > >information.
> >
> > Here is one at 128k bit rate
> >
> > http://tinyurl.com/8ggvcd
> >
> > I don't think they're as stationary as they seem. They are moving
> about.
> >
> > Regards
> > John
> >
>
>
>
[Non-text portions of this message have been removed]
A frequency analysis a louder section of the sounds in question
suggests the peak frequency is 12K.
Might you, being an insect sounds expert, have an opinion on John
Tudor's mystery? Bat or Insect?
John Hartog
--- In naturerecordists@yahoogroups.com, Wil Hershberger <wil@...> wrote:
>
> The peak frequency is the frequency at which the most sonic energy is
> produced for said species. It is not the maximum frequency that the
> species can produce as that is well above the equipments upper limit
> for a number of species.
> I hope that this helps.
>
> Is there is an online resource for songs of insects found in Austrailia?
Not that I know of. I've done a lot of Googling regarding insects over
the last few weeks and haven't stumbled on one yet.
Also, regarding your comment about the sounds not moving around, the
location I was set-up would have had most things way out in front of
the stereo microphone rig (Schneider disc), so movement may not be
apparent.
The 192K link didn't work for me - but don't trouble yourself now that
Wil clarified the definition of "peak frequency."
It was easier for me to hear the sounds moving in the 128k version
than the first version. The primary subject moves from left to right
in three or four stages. A couple of the chirp sections speed up at
the end from chip to rattle to buzz. One rattle/buzz segment at 0:11
sounds out of place and might be from a second caller.
John Hartog
Stereo sound placement
>
> OK, here is one at 192k from the original wave file maxing out well
> above 20kHz
>
> http://tinyurl.com/8fhwqu
>
> > Is there is an online resource for songs of insects found in
Austrailia?
>
> Not that I know of. I've done a lot of Googling regarding insects over
> the last few weeks and haven't stumbled on one yet.
>
> Also, regarding your comment about the sounds not moving around, the
> location I was set-up would have had most things way out in front of
> the stereo microphone rig (Schneider disc), so movement may not be
> apparent.
>
> Regards
> John
>
Thanks Vicky,
Definitely a valuable resource. I will have fun reviewing it.
John
--- In naturerecordists@yahoogroups.com, Vicki Powys <vpowys@...> wrote:
>
>
> On 28/12/2008, at 2:51 PM, John Hartog wrote:
>
> > snip....
> >
> > Is there is an online resource for songs of insects found in
> > Austrailia?
> >
> > John Hartog
> >
>
> There is a very good online resource on Australian cicadas, with
> sounds too, from Lindsay Popple at
>
> http://bacs-s02.bacs.uq.edu.au/sib/ins-info/
>
> Vicki Powys
> Australia
>
The file I listened to, had 3 sounds that I could define.
The most prominent sound was I assume the cricket (sounded like it to
me), the second sounded to me to be either crickets or tiny wrens,
wrens was my immediate thought, I hear them around me often at dusk
and dawn, the third sound that "flew" across the field certainly
sounded like the bats I hear to my ears.
I am not a bat expert but as far as I know we only have two local bats
that are within our audible sonic range - the Yellow-bellied
Sheathtail Bat - Saccolaimus flaviventris and the White-striped
Freetail Bat - Tadarida australis.
The rest are well above our hearing range, so to a degree it makes ID
a little easier.
Cheers
Rally
--- In naturerecordists@yahoogroups.com, "John Tudor" <john@...> wrote:
>
> --- In naturerecordists@yahoogroups.com, "John Hartog"
> <hartogj_1999@> wrote:
> >The mp3 compression you chose cuts off the peak frequencies of the
> >chirps at 11.9k, a bit higher quality might reveal some key
> >information.
>
> Here is one at 128k bit rate
>
> http://tinyurl.com/8ggvcd
>
> I don't think they're as stationary as they seem. They are moving about.
>
> Regards
> John
>
--- In naturerecordists@yahoogroups.com, "ozrall" <ozral@...> wrote:
>
> I am not a bat expert but as far as I know we only have two local bats
> that are within our audible sonic range - the Yellow-bellied
> Sheathtail Bat - Saccolaimus flaviventris and the White-striped
> Freetail Bat - Tadarida australis.
Thanx Rally.
Martyn Stewart sent me an email the day after I posted the clip. In it
he included an image of the recording in 'SonoBat' sonogram software
and says
"I find references of a southern-free tailed bat I recorded in
Adelaide back in 1996. The curve is most typical of these bats.."
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