November 2007
Intermediate to advanced
736 pages
46h 32m
English
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ACOUSTIC DOUBLETS
The cone of a loudspeaker moves as a unit. When the cone moves forward, the air in front is compressed and the air in the back of the cone is rarefied. The sound released from the rear of the cone is of opposite phase to that released from the front of the cone. If the sound from the rear is allowed to flow so that it meets the sound from the front, cancellation takes place and the response of the speaker drops off sharply.
Such an arrangement, Fig. 5.1, is called an acoustic doublet in which the two sides of the diaphragm are represented by a negative and a positive pole radiating respectively a negative and a positive wave [see Fig. 5. 1 (b)]. If these doublet sources are close together, it is obvious that the negative wave ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.