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Power line hum
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Antimon



Joined: Jan 18, 2005
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PostPosted: Sat Feb 20, 2010 4:38 pm    Post subject: Power line hum Reply with quote  Mark this post and the followings unread

Was sitting here with a glass of white and some magnificent sounds coming from Chez Mosc and I came to think about ground hums - those annoying things that you try to get rid of in your studio, from guitars and dodgy ground connections in mixers and synths. Maybe you could make a composition out of 50 and 60Hz (and whatever alternative frequencies there are) hums from around the world? You can take a sample of it and pitch it up and down, just using the timbre.

So, maybe we could do a kind of remix project? How about if people try to record some hum from where they are, post it here (doesn't need to be long samples - we can loop them - so keep them good quality and uncompressed), and then we make tunes out of them?

How about it? Could make up a nice sample library if nothing else.

/Stefan

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dewdrop_world



Joined: Aug 28, 2006
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PostPosted: Sat Feb 20, 2010 9:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

A few weeks ago I heard a "no-input" performance. No oscillators or preloaded samples -- just some line noise and clicks, fed into loopers, filters, and so on. Not bad, though I don't know if it's really rich enough for a full set. Useful exercise for sure.

James

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Sam_Zen



Joined: Mar 08, 2008
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PostPosted: Sun Feb 21, 2010 12:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice idea.!
50 and 60 Hz are the basics indeed (is there a worldmap about this ?). 400 Hz is a third one, often used in ships and planes.

So I just made a recording with a not-connected line input of the PC, while touching the tip of the plug.
In my local habitat this results in a 50 Hz hum 0 - (raw file) - 2.3 sec
To get a better, and shorter, seamless loop with correct zero crossing I made 50 Hz hum 1 - 0.86 sec
As experiment, I treated this one with an inverted hiss reduction, leaving only the background noise : 50 Hz hum 1 - 0.86 sec

The idea of dewdrop_world is a different, but also interesting concept.
It means imo a method of making (digital) sound out of 'nothing'.
So, in this case I recorded 1 sec of the 'silence' at the not-connected line input of the PC, and normalized it at 96 %..

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ark



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PostPosted: Sun Feb 21, 2010 8:24 am    Post subject: Reply with quote  Mark this post and the followings unread

Sam_Zen wrote:
50 and 60 Hz are the basics indeed (is there a worldmap about this ?). 400 Hz is a third one, often used in ships and planes.

I am under the impression that it's 415 Hz, not 400. Very close to concert A-flat, if that matters.
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