An open paper on directional mics
http://www.iwaenc.org/proceedings/2001/main/data/buck.pdf
I had a idea that I could use 2 close mounted mics (o) for Upper frequency
ranges and a longer distance between 2 additional elements (x) to have better
signal to noise ratio for the lower frequency band, would that be practical?
Then mix the 2 hi o and low x frequency signals.
(x) (o)(o) (x) 4 omni mics for a figure
of 8 pattern mic, maybe mounted on a plate according to
I have seen a DIY differential mic based on the blumlein principle
http://www.williamsonic.com/DipoleMic/index.html
A advanced way of doing it:-)
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2677264/
- Bo-Erik
-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Tim Collins
Sent: den 8 januari 2013 18:54
To: Surround Sound discussion group
Subject: Re: [Sursound] Array for sound field recording and extend the sound
image
You can make a velocity microphone by subtracting two closely spaced omnis. I
saw a paper on making ambisonic recordings like this a couple of years ago:
http://www.aes.org/e-lib/browse.cfm?elib=15389
The problems, though, are spatial aliasing at high frequencies and lack of
sensitivity at low frequencies. These would both need addressing in a practical
system.
Best wishes
Tim
====================================================
Dr. Tim Collins
Electronic, Electrical and Computer Engineering
University of Birmingham
Edgbaston, Birmingham, B15 2TT, UK
www.eee.bham.ac.uk/collinst
====================================================
-----Original Message-----
From: Mike Felton [mailto:[email protected]]
Sent: 08 January 2013 00:21
To: Surround Sound discussion group
Subject: Re: [Sursound] Array for sound field recording and extend the sound
image
>The mics are omnis
It might be stating the obvious here but how would you get ANY directional
information out of four OMNI mics close together? :-)
Surely to get a fig-8 response you need two CARDIODS back to back (one of which
is polarity reversed obviously).
Mike Felton
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