Lovely recording Peter!
The first boom sounds like a car door but the other booms sound like
a scare-gun or similar, what a damn nuisance!
If it was me I would use Izotope RX where you can see the
spectrogram, I would zoom right up on the lowest frequencies and then
the booms should be quite clear to see. You should be able to remove
the booms completely using RX (just patch over them), but you would
need to do each boom individually.
cheers,
Vicki
On 06/11/2012, at 6:59 AM, Peter Shute wrote:
> 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.
>
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