naturerecordists
[Top] [All Lists]

Re: Voice of the Valley?

Subject: Re: Voice of the Valley?
From: "chrishails50" chrishails50
Date: Tue Jan 22, 2013 11:12 pm ((PST))
....Or maybe a wind farm/ wind generator up on one of your ridges ?

Chris
http://www.wildechoes.org


--- In  Dan Dugan  wrote:
>
> > I made multiple recordings in various rooms of the house and the
> > cellar and porch today, and outside pointing the microphone in four =

> > directions. The noise is there in all recordings, loudest outside,
> > quietest in the cellar.
> >
> > The frequency is low, around 45 Hz with clear harmonics. The
> > intensity is low, around 5 dB SPL inside and about 15 dB SPL outside. =

> > Those numbers are very, very approximate. I do not have a SPL meter =

> > that reads that low, so I extrapolated based on the levels in the wav =

> > file. Also, in order to hear it at all and have the harmonics show up =

> > in a spectrum image, I had to apply a High Cut filter above 100Hz.
> > Otherwise it is buried in mic noise and whatever else.
> >
> >

>
> I would suspect that someone has a generator running. Low frequencies tra=
vel a long way.
>
> -Dan
>








<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU