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Re: Background thumps in recording

Subject: Re: Background thumps in recording
From: "Chris Harrison" lamprophis1963
Date: Mon Nov 5, 2012 2:34 pm ((PST))
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







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