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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: " ... major manufacturers perform such tests, but simply don't publish the results .." posted by beppe61 on January 15, 2015 at 23:18:32:
"i am more intrigued by measurements carried out with a well designed artificial head. It is more like the real listening conditions."
Four microphones arranged in a tetrahedron are required to give the up-down/left-right/front-back information. Two microphones only define one plane, three mics can define two planes, and four mics give you the entire sphere, enabling you to pinpoint sources in any direction.
This is actually an idea I had started to pursue in the late 1970s, but did not have the resources (money, time, math skills, programming skills) to see it through. (The late great Michael Gerzon used this principle in his original "soundfield" microphone, produced by Calrec, about that same time. See linky.) I attended Malcolm Dunn's (Marshall Day Acoustics) presentation at the October 2014 AES convention, and was coming unglued that they have a working system for measurement and analysis! Later, I went to their exhibit space and had a nice long talk with Hans Forschner (NAVCON consultants). (See other linky.)
Gerzon Soundfield: http://en.wikipedia.org/wiki/Soundfield_microphone
IRIS: www.iris.co.nz
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Follow Ups
- RE: " ... major manufacturers perform such tests, but simply don't publish the results .." - Inmate51 07:59:30 01/16/15 (1)
- RE: " ... major manufacturers perform such tests, but simply don't publish the results .." - beppe61 10:16:29 01/16/15 (0)
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