The area is sand dunes, perhaps up to 20m or 30m high, covered with low shr=
ubby eucalypts up to 3 or 4m high at most, for 10 or 15 km all around. Ther=
e could be some rock outcrops in among it, I don't know.
The array was facing roughly north, and I think the booms seem stronger in =
the right channel, i.e. east? (I haven't got it in front of me now, so I'm =
not sure).
Peter Shute
> -----Original Message-----
> From:
> On Behalf Of Keith Smith
> Sent: Tuesday, 6 November 2012 11:36 AM
> To:
> Subject: Re: [Nature Recordists] RE: Background thumps in recording
>
> PS: the one at 23.2s does seem a bit of an outlier.
> The one at 30.6s is followed by an echo, I think, at 32.9s.
> Likewise 35.2s is echoed at 37.6s.
> I wonder if there's a high ridge about a km away that is
> reflecting it.
> Perhaps the source is in the opposite direction from that?
>
>
> On Mon, Nov 5, 2012 at 5:16 PM, Keith Smith
> <> wrote:
>
> > Hi Peter,
> > Here's a screenshot from Raven Pro (I took the $100 deal)
> -thanks for
> > the fodder!
> >
> > http://www.samplesmith.com/NatRec/MurraySunset_Raven.jpg
> >
> > With the reverberations and repetitions, I'm thinking its source is
> > much farther away. Maybe a military gunnery range within
> 30-40 miles?
> > Keith
> >
> >
> >
> >
> > On Mon, Nov 5, 2012 at 3:34 PM, Chris Harrison
> <>wrote:
> >
> >> **
> >>
> >>
> >> Possibly an Emu? They make a deep thumping like that.
> >>
> >> Were there emus around?
> >>
> >> Chris Harrison
> >>
> >>
> >> -----Original Message-----
> >> From:
> >> On Behalf Of Peter Shute
> >> Sent: Monday, November 05, 2012 1:59 PM
> >> To:
> >> Subject: [Nature Recordists] RE: Background thumps in recording
> >>
> >> Well, that was smart. I forgot to include the link to a
> sample of the
> >> recording:
> >> http://soundcloud.com/petershute/dawn-chorus-pheenys-track
> >>
> >> I've put comments where all the thumps are in that one
> minute sample.
> >>
> >> Peter Shute
> >>
> >> ________________________________
> >> From:
> >>
> >> On
> >> Behalf Of Peter Shute
> >> Sent: Tuesday, 6 November 2012 5:52 AM
> >> To:
> >> Subject: [Nature Recordists] Background thumps in recording
> >>
> >> I recentlly made some recordings in Murray Sunset National
> Park, in
> >> north west Victoria, Australia. It was, I thought, a very
> quiet place
> >> in the mornings before the wind started, apart from the birds.
> >>
> >> But in one recording, there is a thumping noise at random
> intervals,
> >> right through the two hour recording, which starts just before
> >> sunrise. Could I please have some opinions on what these
> noises might be?
> >>
> >> At first I thought they were a car door being slammed - we were
> >> camped about 300m away, just over the hill - but there are far too
> >> many of them.
> >> Gunshots? Not allowed in the park, and the nearest farms are over
> >> 10km away, although it's still possible, as there are
> feral goats in
> >> the park.
> >>
> >> I'd also like to know if there's a good way of finding all
> of these
> >> in the recording without having to listen to it. I can
> only hear them
> >> if I use headphones, and if there's no background noise in
> the room,
> >> so it took me a while to find as many as I have.
> >>
> >> After I'd found a few just by listening, I used EQ to reduce
> >> everything above 400Hz and increase everything below 200Hz. This
> >> makes them way more obvious to the ear, and I can spot most on the
> >> waveform, but it's not very pleasant to listen to. It also
> makes the
> >> sound of wingbeats sound similar, so I made a few mistakes.
> >>
> >> Could there be an automated way of finding them all, or
> making them
> >> reliably more obvious on the waveform? I use Audacity.
> >>
> >> Peter Shute
> >>
> >>
> >> ------------------------------------
> >>
> >> "While a picture is worth a thousand words, a sound is worth a
> >> thousand pictures." R. Murray Schafer via Bernie Krause.
> >>
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >
> >
> >
> >
> >
> >
>
>
>
>
>
> ------------------------------------
>
> "While a picture is worth a thousand words, a sound is worth
> a thousand pictures." R. Murray Schafer via Bernie Krause.
>
> Yahoo! Groups Links
>
>
>
>
|
