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Leibson's Law

Steve LeibsonLeibson's Law: It takes 10 years for any disruptive technology to become pervasive in the design community. This blog is about the disruptive technologies that either have or will win over electronic engineers, some that won't, and why. Please feel free to link to these blog entries! Written by Steve Leibson, a marketing consultant specializing in lead generation and content creation for high-tech companies, former VP of Content for Reed Business, and former Editor in Chief of EDN. See my consulting Web site at www.sleibson.com and my history site at www.hp9825.com. You can email me at steven.leibson followed by the magic email symbol @ followed by att.net.

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Wednesday, January 9, 2008

CES 2008: One Speaker Box Produces Amazing Stereo Sound

Jan 9 2008 3:14PM | Permalink |Comments (2) |


My last visit before leaving the CES 2008 show was with a British company named airSOUND. (You’ve gotta love these silly corporate-centric capitalizations.) Founder Ted Fletcher has invented a way for two co-located speakers in one enclosure to produce a stereo-effect sound field. The secret is the way the speakers are fed and the way they’re positioned in the box. A forward-firing speaker emits left-plus-right sound. A second speaker, trapped in a sealed port in the box, emits left-minus-right sound from a port in the left side of the box.

 

  

Thus the composite signal emitted to the listener’s left is simply “left” (L+R+L-R) = 2L (effectively L). The acoustic signal emitted out of the right-hand enclosure port is 180 degrees out of phase with the left-port signal (as generated by the back of the (L-R) speaker), so it is –(L-R) or R-L. Thus the composite signal heard on the right side of the enclosure is (L+R) + (R-L) = 2R. Ingenious.

It sounds good as well. The need for only one enclosure to produce a stereo sound field simplifies many product designs, so if you need something like that, look into airSOUND.


Related entries in: Components, Hardware, Interconnect | Consumer Goods | Electronics Applications | 

Reader Comments



at 1/10/2008 1:52:05 PM, r3son8tr said:
I was going to dismiss this, but it''s actually pretty cool, as long as the program material is good enough. Trouble is, most - if not all - recordings other than some jazz and classical are basically mono studio recordings. Some elements may be panned left or right, but it''s basically mono. From the website:
With well recorded sound, the AIRSOUND™ speaker will reproduce a realistic stereo soundstage in front of the AIRSOUND™ loudspeaker throughout the room.



at 1/10/2008 3:40:37 PM, Steve Leibson said:
Jazz and classical were not part of the musical repertoire airSOUND was demonstrating at CES. It was your usual mix of popular music and there was a perceivable, qualitative diffference between mono playback and airSOUND stereo playback. The stereo version sounded much better, much fuller to my ears.

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