German Pavilion: The "Secret" &Nbsp Of Listening To Voices; The Source Of Power For Understanding "Harmonious Metropolis"

　　　　　　　在游客们齐心协力的呐喊声中，金属球开始高速摆动

The 7 minute "power source" metal ball show is the "Grand Theatre" of the German Pavilion in World Expo. An interactive metal ball, weighing 1.3 tons and equipped with 400 thousand LED light-emitting diodes (mainly used to display images), is located in the three Hall of the German Pavilion at the end of the tour. At the beginning of the interaction, the audience was divided into two batches and shouted along with the instructions of the commentator. After hearing the cry, the metal ball first flashed one eye, and automatically found the direction of the loudest sound. Then, on which side the cry was loud, the interaction ball swayed to the other side more fiercely, and at the same time, the surface of the ball also showed a beautiful vision of the city.

In the face of this fun ball, the reserved Chinese will shout wildly, but do you know the secret? A metal ball has no ears and no brain. How does it distinguish the size of sound and react?

The key part of the mystery lies in the "power source" hall, with 8 microphones circling a metal ball on the ceiling and listening to the audience's voice in 8 directions. A computer (server) analyzes the decibel of the 8 sounds, then directing the "black box" mounted on the metal ball hanging rope, a spanmission device responds in the direction of the swing. At the same time, through other computer control, the video display on the ball will change with the sound.

　　
The "power source" metal ball was developed by German Mira joint design and planning Co., Ltd. with University of Stuttgart, Institute of engineering and computational mechanics, mechanical parts research institute, machine tool and equipment manufacturing control engineering research institute. "The relevant technology used in metal balls is actually not mysterious. It has long been put into use, but it seems that few people can use such technology to do such a fun thing," Inge Kasco, project manager of joint design and planning Co., told reporters. Several scholars at University of Stuttgart believe that it is not too difficult to make 1.2 tons of metal balls move with sound. It is difficult to ensure the safety of a total of 14 thousand performances in half a year, which adds a lot of complicated factors to the design of the whole system.

"I guarantee that the" power source "metal ball is unique, only in World Expo, Shanghai. Ingrid said that the "treasure of the town hall", which costs more than a million euros, will be spanported back to Germany to continue showing after World Expo. "Besides, what is the future application of this technology?" The reporter asked. "Oh, no! "It's just an interesting device," said Engel. "I think you may have some misunderstandings." the source of power "is not to show any great new technologies, but to let all the audience in their personal participation understand that each of us is a source of motivation for creating a harmonious city. As long as we unite, we can create a better city. "