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: O=
n
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 abou=
t
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 reliabl=
y
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.
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