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Hi,

I am interested in capturing LFO type sounds in nature. Something that starts at a high oscillating rate and drops to a lower one... Does anything come to mind? Animals, natural phenomena (weather, springs, rivers, etc)

thanks... -Steven

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7 Answers

up vote 5 down vote accepted

A couple of years ago I had the pleasure of watching Encounters at the end of the world at the cinema. The recordings of seals and other marine life in that film are really amazing, and an amazing experience in the cinema

[youtube]OlrcbKlW4Tw[/youtube]

Most of the sounds are like sawtooth LFOs - from high to low.

In a sense though, many natural phenomena create LFO style patterns when graphed on a larger scale. If you think about an environment which contains birds and insects for example, they all fall into a natural rhythm as they try to be heard. This on-off pattern is like a complex interdependent pattern of square waves.

And of course, if you graph the rise and fall of the sea you get the original sine wave:

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holy crap! that's exactly what I was hoping for. wow. –  Steven Sep 18 '12 at 18:44
    
do you know if those actual un-processed recordings? of the seals? or have they been compressed/stretched from longer/shorter time scales? –  Steven Sep 18 '12 at 18:45
    
I'm pretty sure they're straight hydrophone recordings. You can hear sounds like these here: awi.de/en/news/background/… .It's a live stream from the Antarctic ocean, so no alterations are possible. I'm really interested to know how they make these sounds. –  Mark Durham Sep 18 '12 at 22:21
    
That is awesome! Great video. –  Colin Hunter Sep 19 '12 at 17:46
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This is quite a nice clip. As a cicada gets going it's 'chirp' starts of of at a low oscillating rate then progressively increases.

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that's nice, thank you! –  Steven Sep 18 '12 at 18:48
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How about rain?

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Check out this blog about the dispersion of sound waves in ice sheets:

http://silentlistening.wordpress.com/2008/05/09/dispersion-of-sound-waves-in-ice-sheets/

If you listen to the recording at 35s in particular they captured an awesome sound which may be the kind of thing you're after.

They also share their recording technique which is nice.

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awesome, thank you... never would've guessed ice could make those sounds.... –  Steven Sep 18 '12 at 18:49
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Frogs? Pigeons?

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The opposite happens with Hornbills. That "ooh-ooh-ooh-AH AH AH" screech one often hears in jungle scenes isn't a monkey, but rather a bird, and it's just the crescendo of a pretty long (multi-minute) song that starts with a low "whoo," not unlike an owl, and raises in frequency of utterance as well as pitch. Still, an interesting (if inversed) morph over time. Recorded this myself in Thailand many years back.

Breaking waves are good, too, as are thunder claps.

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thanks NoiseJockey, gonna check it out... –  Steven Sep 18 '12 at 19:22
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thanks all, great responses and leads. If there are more, keep em coming!

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