The following is a somewhat paraphrased conversation between Henry (age 12) and Dad (age, uh, somewhere north of 40) on the way home from Thanksgiving…
Henry: Hey Dad, can you make a loudspeaker that aims only in one direction?
Dad: Well, sort of. Because of the way sound works, you need a very wide loudspeaker to make it directional and ‘point’ in some direction. For a reasonable size loudspeaker, you can make it very directional only at high frequencies.
Henry: Awesome. Can I make something that attaches to my iPod Touch and aims the sound from the ‘Dog Whistle’ app?
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