Then I basically stopped at what materials we needed to make that happen—they’re called transducers, which convert electrical energy into sound and sound back into electricity. I knew that for this project to work, I needed the right transducer, and a transmitter that needs to have this amount of power and be able to beam that power across the room and hit these targets, and so on.
然后,我基本上停顿在这种技术所需要的材料上——这种材料叫做“换能器”,它可以把电能转化成声波,再把声波转化为电能。我知道这个项目要想成功,必须要有正确的换能器,另外还得有一个能发射足够额度电能的发射机,等等。
And that existed already?
这些是否已经有了?
Yes, transducers are used in speakers. And that’s effectively what uBeam is: a speaker. To make sound, in general you plug in a speaker, which is a bunch of sonic transducers. And we’re using ultrasonic transducers, which is sound above what you can hear. So when you plug in a speaker, you’re taking electricity from a wall, and the electricity is converted into sound, and that sound travels through the air. You’re converting electrical energy into acoustic energy. So that already exists. But a speaker is radiating out sound in 360 degrees, and you’re not going to get that much power from sound unless you focus it. So you have to do the same thing you would do with a laser beam, or with a light bulb—you take the energy and funnel it into a cone. But we’re not physically focusing it, we’re digitally focusing it. So we had to create a transmitter that digitally focuses sound to get enough power out of our ultrasonic speaker across the room. So the whole concept of uBeam worked because I knew that transducers existed. It was just a matter of thinking about sound as a form of energy, which people don’t often think about.
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