How a Trumpet Produces Sound / Mr. Denjiro's Happy Energy! скачать в хорошем качестве

How a Trumpet Produces Sound / Mr. Denjiro's Happy Energy!

DENJIRO: This is a Triton's trumpet. It was used in Japan in the past to send signals during battle. When you vibrate your lips, the Triton's trumpet amplifies the vibrations to produce sound. But how does it make such a loud sound? Let's perform an experiment with this device. I'm going to make waves in two waterways and compare them. With the waterway that spreads out, you can see that the ripples get larger. The Triton's trumpet also has a shape that spreads out. This allows it to efficiently vibrate the air around it and produce a loud sound. Brass instruments such as trumpets have a similar structure. I have here a handmade trumpet. You can play different notes by changing the length of the tube. Let me use a spring to explain how that works. The length of the spring is the length of the tube. Instead of vibrating my lips, I'm going to move my hand up and down. We see that there's one wave. If I speed up the vibration... there's two waves. And if I speed it up even more... three waves. The number of waves increases. As we get more waves, the sound's pitch gets higher. This is called "overtones." With a trumpet like this, you can only produce a limited number of pitches, and you can't play a scale. But with a trumpet, you can play scales using the pistons. The pistons in a trumpet allow for the length of the tube to change. That's how you play scales on them. I hope energy will bring you all happiness. Our magic word is "Happy Energy!"