Under the blue sky, above the blue sea, a white catamaran cut through the sea and headed south again.

The voyage will take you south to Vietnam, Indonesia, Sumatra, Indonesia, and cross the Strait of Malacca to the Indian Ocean.

And this route is Zheng He's first route to the West.

To some extent, Gu Xiaobai is chasing another footsteps of himself.

In the last sea trial, the main test was the overall performance of the hull, the mechanical equipment and the performance of the ship itself.

But this time, Gu Xiaobai will test all the instruments on the ship.

In addition to Gu Xiaobai taking over the original equipment of the Zhong Jun before, Gu Xiaobai also added more equipment on the ship.

Many of them are very difficult to transform, not to mention the high cost of the equipment, and even many of the equipment, in fact, there is no finished product at all, and Gu Xiaobai needs to customize it, but fortunately, Gu Xiaobai has money again.

At this moment, Gu Xiaobai was sitting in the room at the back of the cab, quietly reading a book, until Jiang Hailong came in: "Xiaobai, the several hydroacoustic transducer arrays you are tinkering with have been debugged, do you want to try it?"

Gu Xiaobai's eyes lit up, he stood up, walked to a console at the back of the cockpit and sat down.

Beside him, a staff member looked over curiously.

This thing looks a lot like sonar, with complex graphics on the screen.

But isn't there already a sonar on board? Why is there another one?

"What is this?" Wang Guanshan leaned over to Jiang Hailong's side and asked in a low voice.

"You don't understand it. Jiang Hailong ruthlessly despised Wang Guanshan, "This is a full-band high-fidelity underwater acoustic transducer system, which is very complex ......"

"Phew, what's on the ship, there's something I don't understand? Isn't this just sonar?"

"Sonar, this thing is not used as sonar," Jiang Hailong pouted, "so you don't understand ......"

"Why don't you say that I don't understand?" Wang Guanshan was still unconvinced.

My old king crisscrosses the rivers and lakes...... No, I've been crisscrossing the ocean for decades, and there's something I don't understand?

"It's a sonar. Gu Xiaobai interrupted the bickering of the two people, "I used the existing underwater acoustic transducer technology to form a complex array by myself, using low-frequency sensitive bending transducers and low-frequency resonators to cope with the frequency band of 10-1000 Hz, using composite rod transducers and round tube transducers to cope with the frequency band of 1k-10k hertz, and then using piezoelectric transducers to cope with the frequency band of 100k-1M Hz, and then using thick-film piezoelectric perforation plates to cope with the frequency band above 1M until 100M Hz...... By integrating their signals and reorganizing the signals, the sound ...... in the seawater can be restored to the greatest extent."

Wang Guanshan: "......"

A sonar, is it so complicated?

You must be lying to me!

What are you talking about, and why do you understand every word, but when you put it together, you don't understand it at all?

Jiang Hailong: "Look, I said you don't understand. ”

If you don't believe me, Brother Jiang, you'll suffer.

Do you feel that you are particularly ignorant and uneducated?

The so-called transducer is actually an electroacoustic transducer, which converts electrical energy into sound, or converts sound into electrical energy.

To put it bluntly, it's a microphone or a speaker.

But this one is used exclusively in water.

Since transferring the research field to hydroacoustics, Gu Xiaobai has spent almost all of his time in the design and manufacture of this set of underwater acoustic transducer arrays in the past month.

Now it's finally pretty much done.

In the next month, he will continue to refine the algorithm and debug the equipment.

Seeing that Wang Guanshan still didn't understand, Gu Xiaobai said: "You have seen many car owners who will transform their trunks into subwoofers, and move them twice while running." ”

Wang Guanshan has a picture.

"Imagine swapping those subwoofers for the best HIFI equipment in the world, and then magnifying them hundreds of times and installing them on the Zhongjun. ”

Wang Guanshan understood.

Wait, what the hell am I ......

Are we a sports car teenager who moves all the way?

No, boat boy!

Who are we going to play the song to?

Do you want to chase the cargo ship and play a song to them?

Hey, don't run, listen to whether my subwoofer is loud! Is it good? Is Lao Tzu handsome? Is Lao Tzu rich?

It's been decades, and I've never seen such a dirty country!

Wang Guanshan suddenly felt that he was simply dyed yellow Moxigan's head, wearing leather pants, wearing earrings, driving a special lowB modified sports car, and a demolition teenager on the street!

"Oooh oh...... I see, the sound of the bell and drum harp before used the sound of this transducer!"

Wang Guanshan Road.

No wonder Zhong Jun can make such a loud sound, with such a set of audio equipment, how can it not be loud?

"No......" Gu Xiaobai wanted to say that it wasn't, but after thinking about it, forget it, let him think so.

In fact, at that time, this set of equipment was not yet installed.

Jiang Hailong showed a smile full of superiority.

You don't understand the miracles of our Lord Zhongjun.

It's okay, I don't understand either.

As long as I understand this set of underwater acoustic transducers, I am much more powerful than you.

And this set of underwater acoustic transducers almost wraps the entire outer shell of the Zhongjun.

Its price ......

The helicopter that fans gave to Gu Xiaobai can't be compared.

also made money thanks to "Goodbye Boy", and the income of the new album is also very good.

Otherwise, Gu Xiaobai will become "Bankruptcy Boy".

The new album "Youth 306" is about to become "Poor 306".

At this moment, the initial debugging was completed, Gu Xiaobai took out the headphones, put them on, and closed his eyes.

In an instant, a strange world came to me.

The ocean is a world of sound.

In this vast ocean, light can only travel a few hundred meters at most.

At 400 meters below the ocean, it is pitch black.

And the sound can travel tens of thousands of miles.

In the air, the speed of sound is only more than 300 meters, but in the water, it is four times its speed.

Therefore, many creatures living in water have evolved a set of talents for positioning and communicating through sound.

But since the scope of human activities has spread in the ocean, the ocean has become extremely noisy.

At this moment, the algorithm of this system has not been fully debugged, and the two groups of ultra-large, ultra-wideband, and ultra-sensitive arrays distributed on both sides of the hull are just transmitting all the signals received to Gu Xiaobai's headphones, without screening, separation, and processing.

Just like the sounds of nature.

In this world, there is no better way to distinguish sound than the human brain.

Even in the most complex sound environment, humans can accurately locate the sound they want to locate.

And among human beings, there may be no one who can be more sensitive to voice than Gu Xiaobai.

And this system, so sensitive, can locate the sound to the far and far.

In an instant, Gu Xiaobai felt that he had sunk into an infinite world.

A vast, three-dimensional world that is wider than what can be seen visually.

Gu Xiaobai's perception seems to be extending through sound, extending ......

The first thing that attracted Gu Xiaobai's attention was a particularly low sound, like a whistle dozens of times lower.

“W...... U——————————————”

A deep voice, like a long, long trombone, blows in your ear.

This kind of sound is almost close to the limit of human hearing, and the ultra-low-frequency sound makes people's entire body vibrate, producing an uncomfortable panic and throbbing.

This is the sound of active low-frequency sonar of warships.

Bigu Xiaobai has heard all the voices that are low and shocking.

It makes people's hearts shrink.

Compared to it, the low sound of the big drum is nothing.

In fact, the sound of this warship is just one of the countless noises in the sea, but the unique low-frequency sound immediately captured Gu Xiaobai's attention and made him separate this sound from the background.

The human brain is very magical, once the attention is focused on a certain sound, other sounds can be heard without hearing.

And the voice, it seems, is also amplified, amplified.

Gu Xiaobai's consciousness also followed the sound and instantly located a place hundreds of kilometers away.

There, there was a warship, which was sailing at sea.

Its propellers, with a clattering sound.

Its bow pressed against the waves, splitting them like a sharp blade.

At that moment, it seemed that there were countless particles converging in the middle from all directions, and a vague picture appeared in Gu Xiaobai's mind.

A huge warship, riding the wind and waves, all the way away.

Then, Gu Xiaobai's consciousness was attracted by another voice.

They are loud and short-lived, nowhere near as deep or as long as the Navy's low-frequency sonar.

They're like tinkling music boxes, you sound them, you sound them.

This is the sound of civilian active sonar.

Civilian sonar with different frequencies seems to form rows of beating notes on the frequency spectrum.

In time, space, scattered distribution.

Gu Xiaobai's consciousness jumped on these notes, and suddenly another voice captured his attention.

Ethereal, melodious, high and low, like a singing voice......

Whale is the voice of a whale!

In the deep sea, beneath the surface of the sea, the water is surging and the sound is rushing.

Under all sorts of noises.

The Navy's low-frequency active sonar, like a kick drum and bass, lays out a layer of bass.

The clatter of the propellers made a dense drumbeat.

Civilian sonar, on the other hand, is like a chord laid out on top of the bass.

And a whale, to the accompaniment of the sea, sang a long song.

Gu Xiaobai closed his eyes, and his consciousness gathered in the direction of the singing.

He didn't hear the water, only the song of the whales.

But in his mind, there were still vague images, which were slowly sketched out.

A huge whale, sinking more than ten meters below the surface of the water, sang quietly.

It's like a singer in the deep sea, a superstar in the ocean.

It sings so earnestly, so focused.

Although it didn't know who was listening to its song, it did know that there were countless creatures underwater that could hear it.

Of course, maybe it didn't expect that at this moment, there was a person listening to its singing, and even humming softly.

There are some melodies, very soft and beautiful.

Music is also a science, and the world is determined by science everywhere, such as the Fibonacci sequence.

Whales don't know much about music theory, but they obviously have evolved the same aesthetic in the same environment as other creatures on Earth.

Gu Xiaobai listened and hummed softly.

In many clips, he also added his own renditions.

It's a pity that the current transducer array has not been fully debugged, and now only the receiving array has been debugged.

Otherwise, he can join the show.

But that's fine.

He can quietly enjoy the performance of this artist in the deep sea.

This is a very long song, and although Gu Xiaobai can't understand what it's singing, he can hear its emotional changes.

Suddenly low, suddenly high.

Suddenly, it sang what seemed to be happy and "giggled" and laughed.

No, maybe for the whales, it's not laughing.

But that was a little funny, some funny laughter, but it made Gu Xiaobai laugh too.

The whole mood has changed for the better.

After a long time, he slowly took off his headphones, opened his eyes, and let out a long breath.

The sound of the sea is addictive.

He almost had to listen to it all the time.

It turns out that there is so much beauty and so much excitement in this world, where you can't see or hear.

"What are you listening to?" Next to him, Wang Guanshan and Jiang Hailong were very puzzled, why did Gu Xiaobai listen and sing?

Gu Xiaobai thought for a while and replied, "The song of the sea." ”

The song of the sea?

Wang Guanshan and Jiang Hailong looked at each other.

They had no idea what Gu Xiaobai was thinking in his head.

Perhaps, the brains of scientists and artists are not something that ordinary people can join.

Next to him, the sonar officer looked complaining.

What's so nice about the sea, I used to listen to it every day, and I was about to vomit!

Fortunately, you don't have to listen to the sonar now, you can just look at the picture.

I used to be on a submarine, and it was one day and one night......

I want to vomit when I think about it.

"Lao Wang, do me a favor. Gu Xiaobai said to Wang Guanshan.

Wang Guanshan was stunned.

A few minutes later, Wang Guanshan followed Gu Xiaobai's order and let the ship start to move fast and slow.

The people on the boat were shaking and fainting.

Wang Guanshan was also a little dizzy.

What are you doing here!

Jiang Hailong is even more helpless, thanks to my electric drive, otherwise you wouldn't have wasted my engine!

However, there is no way, and now if you want to join the chorus of this ocean, there is only this way.

Behind the Zhongjun, the huge propeller was rotating at different frequencies, making different sounds.

In addition to the click of the propellers, another piece of music joins in.

Not many people in this world know about it.

What a "black square formula", in fact, this propeller is a musical instrument.