The Acoustic Nearfield

thadman · 12:24 AM

Let us suppose, we have 2 arbitrary sources (point,line,etc). They are sent the same signal, however they are separated by a particular distance.

How can we determine a qualitative relationship between the sources with respect to the nearfield? How large can the separation be (wrt wavelength) for them to behave as a single source in the nearfield? to sum constructively, <1/4 wavelength?

Thanks,
Thadman

Bigun · 12th October 2009, 02:05 AM

that's a hard question.

I suspect that the answer depends on who's listening - is it a point microphone or a head with two ears separated by a distance ? [http://www.icad.org/websiteV2.0/Conf.../brungart.htm]

thadman · 12th October 2009, 02:39 AM

Quote:

Originally Posted by Bigun

that's a hard question.

I suspect that the answer depends on who's listening - is it a point microphone or a head with two ears separated by a distance ? [http://www.icad.org/websiteV2.0/Conf.../brungart.htm]

a point microphone

12th October 2009, 12:19 AM	#1
thadman diyAudio Member Join Date: Dec 2005 Location: west lafayette	The Acoustic Nearfield Let us suppose, we have 2 arbitrary sources (point,line,etc). They are sent the same signal, however they are separated by a particular distance. How can we determine a qualitative relationship between the sources with respect to the nearfield? How large can the separation be (wrt wavelength) for them to behave as a single source in the nearfield? to sum constructively, <1/4 wavelength? Thanks, Thadman __________________ "It is a profound and necessary truth that the deep things in science are not found because they are useful; they are found because it was possible to find them." Last edited by thadman; 12th October 2009 at 12:24 AM.

12th October 2009, 02:05 AM	#2
Bigun diyAudio Member Join Date: Jan 2009 Location: K-W Ontario Blog Entries: 2	that's a hard question. I suspect that the answer depends on who's listening - is it a point microphone or a head with two ears separated by a distance ? [http://www.icad.org/websiteV2.0/Conf.../brungart.htm] __________________ "The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.

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