don't call me singer

Chapter 1561 Capital Versailles
Active Noise Cancellation, also known as ANC technology, works by using a loudspeaker to emit sound waves opposite to the sound source to cancel out the sound waves.

This technology is mostly used on headphones, so-called active noise-canceling headphones.

Many high-end cars are already equipped with ANC technology to eliminate engine noise and improve the sound quality inside the car.

However, what can be eliminated in the vehicle is only the regular engine noise, and the effect on tire noise, wind noise, etc. is actually not great.

There is no other reason. Noise-cancelling headphones only need to collect the sound of a point in the ear canal, and then cancel it in reverse.

But when the space is expanded to a relatively large scale, it is too complicated to eliminate the sound in the entire space. The sound of each position is different.

For example, Gu Xiaobai's big bell, the sound of the bell has a very complicated interference effect, and the sound heard by the left and right ears is different.

Therefore, the more complex the space and the larger the space, the more difficult it will be for active noise reduction.

Moreover, for an open space, how to distinguish what is noise and what should not be eliminated?

In such a huge space as the Sky Concert Hall, it is almost impossible to use algorithms for reverse noise reduction.

First, the computing power of current technology is not enough.

Second, there is currently not enough technology to allow the sound to be released at a certain point and cover the entire space.

These technologies are all theoretical at present, but it is impossible to do them in practice.

But now, the Sky Concert Hall has actually done it!
People who are not in the industry may not have a deep feeling for this kind of thing, but just sigh the magic of the sudden lowering of the voice.

Some people subconsciously yelled "Oh" twice, listening to the reverberation in the space, amazed.

Like a curious child.

But the more than 200 practitioners of aviation companies present had different expressions.

What kind of algorithm, what kind of directional speaker, and what kind of self-decompression algorithm does Gu Xiaobai use to direct the sound to everyone's ears and eliminate the different sounds in each person's ear?

Simply tracking more than 1000 people in this space is impossible with the current technology...

How many black technologies have Gu Xiaobai's laboratory and his Colin Flying mastered?

What is an acoustic boss?This is the acoustic master!

I almost forgot, engineering is just Gu Xiaobai's side job, his job is acoustics...

When Wang Haixia, Fu Wenyao and others sat down just now, Yan Zhetao hesitated for a while, whether to sit with Airbus, Boeing and other colleagues, but seeing Tokavsky sitting next to several teenagers, he hesitated, He also sat down.

Standing tickets should sit with standing tickets.

At this moment, Yan Zhetao also moved his head left and right, wanting to test where the limit of active noise reduction is.

No matter how I measured it, I felt it was perfect, and I was immediately moved, shocked, and puzzled.

If this technology is used on your own plane, how good will the ride experience be?

In his heart, it was like a cat's paw was scratching, wanting to know how to do it.

Then when he looked up, he saw He Shisong coming from behind, looked around, and sat down beside them.

"Old He, why did you come out?"

"Oh, I'm coming to see the show." He Shisong said, now he doesn't need to worry about the basic flying, and in the following process, he has nothing to do most of the time, so of course he came out to watch the show.

"Oh..." Yan Zhetao wanted to ask, but felt that this must be someone else's technical secret, and it was not kind to ask himself.

But after holding it in for a long time, he couldn't hold it anymore, and asked, "Old He, are you using active noise reduction technology?"

"Active noise reduction technology? No." He Shisong said.

"No? Then why was there suddenly no noise just now?" Yan Zhetao didn't believe it.

"Oh, we turned off the stereo because the show was about to start."

Stereo turned off?
Yan Zhetao: "????? Audio? Turned off?"

"Well, Xiaobai said that if there is no sound during takeoff, it may cause uneasiness to the passengers, so we turned on the stereo and played some simulated noises."

Yan Zhetao: "?????????"

I don't read much, so don't lie to me!

"You mean, now this is..."

"Passive noise reduction." He Shisong said.

"how is this possible!"

"The Sky Concert Hall was designed for sky performances from the beginning. The four engines are huge in size. When they are running, the noise does not exceed 40 decibels at a distance of 100 meters. In addition, the shell of the Sky Concert Hall has undergone a special process. Design to reduce wind noise; the design of the inner and outer layers is actually to absorb sound waves. In addition, Xiaobai seems to have used some new noise-reducing materials and structural design..." He Shisong spread his hands, "I don't understand Xiaobai's research either. .”

The noise of an airplane taking off is about 140 decibels, and the noise in the cabin is about 105 decibels.

And such a huge aircraft as the Sky Concert Hall can reduce the sound of the engine to less than 100 decibels.

Coupled with a variety of acoustic designs that seem to be an understatement, but even a boss like He Shisong can't understand, now, the Sky Concert Hall is quieter than the library.

If you listen carefully, you can only hear a slight buzzing sound, like in an ordinary room on the ground. The slight background noise may even be mistaken for your own tinnitus.

For a while, Yan Zhetao didn't know what to say.

Active noise reduction in such a large space is almost impossible to achieve.

But the passive noise cancellation goes down to this level.

It seems more Versailles!
What is an acoustic boss!

This is the acoustic boss!

Next to it, Tokavsky listened to it for a long time, and choked out a sentence: "The sound effect is good..."

Although he doesn't know aviation technology, and he hasn't been on a plane for decades.

However, basic common sense is still there.

The fake engine noise sounds flawless. What else can I say besides "good sound effect"?

"That is, the sound system of the entire Sky Concert Hall was tuned by Xiaobai himself." He Shisong said.

"Old driver, do you want to hold a concert at the Sky Concert Hall!" Wang Haixia said.

Tokavsky was a little moved, but he curled his lips and said, "Let's see..."

Yan Zhetao sighed, then turned his head to look forward.

Sitting in front, industry elites from major aviation companies were whispering to each other, discussing what kind of active noise reduction technology Gu Xiaobai used.

No one thought that this is not some kind of active noise reduction technology.

Who would have thought that the sound of the engine just now was all simulated?

Gu Xiaobai's trick is really flamboyant...

Literally capitalized Versailles.

At this moment, the lights suddenly dimmed, and the center stage changed.

(End of this chapter)