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

The voyage of this trip will go all the way south to Vietnam, Indonesia, Sumatra, Indonesia, and pass through the Strait of Malacca to the Indian Ocean.

And this route was exactly the route Zheng He took on his first voyage to the West.

To a certain extent, Gu Xiaobai is following in the footsteps of another himself.

The last sea trial mainly tested the overall performance of the hull, 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 the original equipment on the Zhongjun before Gu Xiaobai took over, Gu Xiaobai also installed more equipment on the ship.

Many of the modifications are very difficult, not to mention the equipment is expensive. In fact, many of the equipment are not finished products at all and need to be customized by Gu Xiaobai. Fortunately, Gu Xiaobai is rich again.

At this moment, Gu Xiaobai was sitting in the room behind the cab, reading quietly, until Jiang Hailong came in: "Xiaobai, the underwater acoustic transducer arrays you tinkered with have been debugged. You

Do you want to try it?"

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

Next to him, a staff member looked over curiously.

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

But didn’t there already be a sonar on the ship? Why was another one installed?

"What is this?" Wang Guanshan approached Jiang Hailong and asked in a low voice.

"You don't understand even after I tell you." Jiang Hailong looked down upon Wang Guanshan mercilessly, "This is a full-band, high-fidelity underwater acoustic transduction system, very complex..."

"Bah, there are things on the ship that I don't understand? Isn't this just a sonar?"

"Sonar? This thing is not used as a sonar." Jiang Hailong curled his lips, "So you don't understand..."

"Why don't I understand if you don't tell me?" Wang Guanshan was still unconvinced.

I, Lao Wang, have traveled all over the world... No, I have been traveling across the oceans for decades. Is there anything I don’t understand?

"This is a sonar." Gu Xiaobai interrupted the bickering between the two people, "I used existing underwater acoustic transducer technology to build a complex array myself, using low-frequency sensitive flextensional transducers and

Low-frequency resonators deal with the frequency band of 10-1000 Hz, using composite rod transducers, circular tube transducers to deal with the frequency band of 1k-10k Hz, and then using piezoelectric transducers to deal with the frequency band of 100k-1m Hz, and then using thick

The membrane piezoelectric perforated plate can deal with the frequency band from 1m to 100mHz... By integrating their signals and reorganizing the signals, the sound in seawater can be restored to the maximum extent..."

Wang Guanshan: "..."

Is a sonar so complicated?

You must be lying to me!

What are you talking about? Why can I understand every word, but I don’t understand them all when put together?

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

If you don’t believe me, Brother Jiang, you will suffer a loss.

Do you feel that you are particularly ignorant and uneducated?

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

To put it bluntly, it is a microphone or speaker.

But this kind is specially used in water.

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

Now it's finally basically done.

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

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

Wang Guanshan has a picture.

"Imagine replacing those subwoofers with the best hifi equipment in the world, then amplifying it hundreds of times and installing it on the Zhongjun."

Wang Guanshan understood.

Wait, what the hell...

Are we just a sports car boy who makes big moves all the time?

No, boat boy!

Who are we going to play songs for?

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

Hey, don't run away, listen to whether my subwoofer is ringing! Does it sound good? Am I handsome? Am I rich?

It’s been decades since I’ve seen such a rustic country!

Wang Guanshan suddenly felt that he was just like a demolition boy with a yellow mohawk, wearing leather pants and earrings, driving a particularly low-key modified sports car, and getting high on the street!

"Oh oh oh... I understand, the sound produced by the previous bells and drums was the sound produced by this set of transducers!"

Wang Guan Shan Road.

No wonder Zhongjun is able to make such a loud sound. With such a set of audio equipment, how can it be possible that the sound is not loud?

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

In fact, this equipment had not yet been installed at that time.

Jiang Hailong showed a smile full of superiority.

Don’t you understand the miracles of our Lord Zhong Jun?

It doesn't matter, I don't understand either.

As long as I understand this set of underwater acoustic transducers, I will be much better than you.

This set of hydroacoustic transducers almost covers the entire outer shell of the Zhongjun.

Its price…

The helicopter that fans gave to Gu Xiaobai cannot even compare to it.

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

Otherwise, Gu Xiaobai will become "Bankrupt Boy".

The new album "Youth 306" will also 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 and bizarre world rushed in front of us.

The ocean is a world of sound.

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

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

But sound can travel thousands of miles.

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

Therefore, many creatures living in the 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. The two sets of ultra-large, ultra-wide-band, ultra-sensitive arrays distributed on both sides of the hull are just passing all the received signals to Gu Xiaobai.

In headphones, there is no filtering, no separation, and no processing.

Just like the sounds of nature.

There is nothing in this world that can distinguish sounds better than the human brain.

No matter how complex the sound environment is, humans can accurately locate the sound they want to locate.

And among humans, perhaps no one is more sensitive to sounds than Gu Xiaobai.

And this system is so sensitive that it can locate sounds extremely far away.

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

It's a broader, three-dimensional world than what you can see visually.

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

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

"w...u——————————————"

A low sound, like a long trombone, is blowing in your ears.

This kind of sound is almost close to the limit of human hearing. The ultra-low frequency sound makes people's whole body vibrate, causing an uncomfortable feeling of panic and palpitations.

This is the sound of the warship's active low-frequency sonar.

All the sounds that Gu Xiaobai had heard were deeper and more shocking.
To be continued...