here the paper:
http://www.rycote.com/images/uploads/The_Stereophonic_Zoom.pdf
by googling with "stereophonic zoom" you can also find other related
articles? ¢â? ¦.
Gianni
2013/8/9 umashankar <>
> **
>
>
> here/ I found the article
>
> umashankar
>
> From: umashankar <>
> To: "" <>
> Sent: Friday, August 9, 2013 5:41 PM
> Subject: Re: [windows-1252] Re: [Nature Recordists] ma? ¢ï»¿ybe a strange
> question? ¢ï¿½. how to make a good? ¢ï»¿ white noise ?
>
> there is an article somewhere called the stereophonic zoom. the
> mathematics of microphone patterns, angles between them and distance is
> very nicely detailed there.
>
> umashankar
>
> From: Gianni Pavan <>
> To: "" <>
> Sent: Friday, August 9, 2013 4:01 PM
> Subject: Re: [windows-1252] Re: [Nature Recordists] maybe a strange
> question? ¢ï¿½. how to make a good white noise ?
>
> Hi David,
> when recording with gunmics (Sennheiser K6/ME66) I keep them spaced to
> form a 30 degrees V with 16cm spacing on their front. I also tried keeping
> them parallel, spaced by 16cm as well. However I don't have a clear idea of
> which solution is better? ¢â? ¦. With the V I get more stereo effect on the
> sources I'm pointing to, but sounds coming from the side may appear more
> frontal than their real position. I'd need more testing about these
> configurations. Any idea about this issue ?
>
> Gianni
>
> 2013/8/9 <>
>
> > **
> >
> >
> > > Dear Dan, I agree with the method you suggest, however my willing is to
> > > have a smooth noise to easily see in real-time the coloration of mics
> and
> > > variable mounting options.
> > > I'll do some tests with different sources? ¢â? ¦. including waterfalls and
> > > showers.
> >
> > Gianni,
> >
> > I also find using a power spectrum useful to see colourations, especially
> > if
> > you compare this with a known mic to see what is source sound colouration
> > and what is colouration by the mic under test. Look for a "comb effect"
> > where the response rises and falls at regular intervals.
> >
> > With stereo recording, much of the sound is coming in off-axis and with
> > directional mics like cardioids and gunmics, the frequency response
> > pattern
> > often changes off-axis.
> >
> > Even with a "flat" response, the mic mount, windshield, surrounding
> > objects
> > and the ground can all produce colourations. A classic colouration is
> with
> > a
> > passing aircraft on a mono mic mounted above a hard ground surface when
> > you
> > get a variable comb filter effect from the ground reflection.
> >
> > I use crossed gunmics (MKH-416) and if they are set too wide, the
> > colouration becomes very audible. Where they win out is the lower
> > sensitivity to unwanted sounds and reflections.
> >
> > David Brinicombe
> >
> >
> >
>
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>
> ------------------------------------
>
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>
> Yahoo! Groups Links
>
>
> ------------------------------------
>
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
>
> Yahoo! Groups Links
>
>
>
>
--
Centro Interdisciplinare di Bioacustica e Ricerche Ambientali
Universit? ¢Ã degli Studi di Pavia
Via Taramelli 24, 27100 Pavia
http://www.unipv.it/cibra
http://mammiferimarini.unipv.it
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