Here's a screenshot from Raven Pro (I took the $100 deal) -thanks for the
With the reverberations and repetitions, I'm thinking its source is much
farther away. Maybe a military gunnery range within 30-40 miles?
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-----
> On Behalf Of Peter Shute
> Sent: Monday, November 05, 2012 1:59 PM
> Subject: [Nature Recordists] RE: Background thumps in recording
> Well, that was smart. I forgot to include the link to a sample of the
> I've put comments where all the thumps are in that one minute sample.
> Peter Shute
> Behalf Of Peter Shute
> Sent: Tuesday, 6 November 2012 5:52 AM
> 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, righ=
> 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
> 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
> 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 th=
> 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=
> 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 ver=
> 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
> 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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