naturerecordists
[Top] [All Lists]

Re: Re: parabolic T mic and phase invert noise reduction

Subject: Re: Re: parabolic T mic and phase invert noise reduction
From: umashankar <>
Date: Fri, 31 Dec 2004 18:02:21 -0800 (PST)
have you tried mounting the capsules in axis, one mic
slightly behind the other. that way, if one mic is in
focus and the other is not, phase cancellation should
leave behind only the sound focussed on by the dish.

umashankar
--- John Hartog <> wrote:

>
>
>
> Thanks Rich, for your picture of your mic
> configuration and
> the audio clip. I find your method of noise
> reduction
> interesting.=20
> Here's a picture of how my Shure WL183s are
> currently
> mounted:
> http://www.hevanet.com/rockscallop/183sInDish.jpg
> and a short (160k) snippet of Red Winged Blackbirds
> with other wetland sounds and suburban noise.
> http://www.hevanet.com/rockscallop/041226_RWBB.mp3
> I'm not certain how far away the subjects were -
> 100ft
> or so.  The capsules are mounted 1.5in apart on an
> aluminum
> tube.
> John Hartog
>
> --- In  "Rich Peet"
>
> <> wrote:
> >
> > Still working with the parabolic mic
> configurations.
> > Rough photo and sound to illustrate only.
> >
> > As a hybred between barrier and a no barrier
> stereo mic
> method used in
> > parabolic dishes, I constructed a T mic using the
> 183
> elements.
> >
> > Pictured without foam wind screens as seen through
> the dish.
> > http://home.comcast.net/~richpeet/q1t.jpg
> >
> > Sound when focused at bird seed on the ground with
> quiet
> visiting
> > redpolls and pine grosbeaks at about 100feet. Note
> the sound
> of the
> > logging equipment a few miles away.
> > 1.5 meg download
> > http://home.comcast.net/~richpeet/183t.mp3
> >
> > First segment of three is the raw stereo track.
> >
> > Second segment is a mono track made by combining
> the two
> stereo channels.
> >
> > Third segment is a mono track with one channel
> phase
> inverted prior to
> > combining the two stereo tracks.
> >
> > I thinik it does a pretty good job of reducing the
> logging
> background
> > noise. Of course it can not reduce the background
> noise more
> than the
> > actual gain of the dish itself.
> >
> > Rich
>
>
>
>
>
> ------------------------ Yahoo! Groups Sponsor
> --------------------~-->
> Make a clean sweep of pop-up ads. Yahoo! Companion
> Toolbar.
> Now with Pop-Up Blocker. Get it for free!
>
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/PMYolB/TM
>
--------------------------------------------------------------------~->
>
>
> "Microphones are not ears,
> Loudspeakers are not birds,
> A listening room is not nature."
> Klas Strandberg
> Yahoo! Groups Links
>
>
>     
>
>=20
>
>
>
>



=09=09
__________________________________
Do you Yahoo!?
The all-new My Yahoo! - What will yours do?
http://my.yahoo.com


________________________________________________________________________
________________________________________________________________________


"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
------------------------------------------------------------------------
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/naturerecordists/

<*> To unsubscribe from this group, send an email to:
    

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

------------------------------------------------------------------------





<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