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: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] 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:mjfel...@gmail.com] 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 _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound