"It's very simple. After we dial the phone, our voice enters the phone. The sound is received by the microphone and then becomes a low-frequency analog signal. Then it is converted into a digital signal through an analog-to-digital converter. Then it is converted into an electromagnetic wave through an intermediate frequency chip; and finally it forms electromagnetic waves of different times, frequencies, and waveforms through the radio frequency chip. "

"At this time, the mobile phone of the person who answers the phone receives electromagnetic waves, processes them through the radio frequency chip to obtain high-frequency digital signals, then converts them to digital signals through the medium frequency chip, and finally converts them to low-frequency analog signals through the low-frequency digital-to-analog converter and plays them out by the microphone."

"In this way, the person who answered the phone heard our voice. Although the sound quality has changed, communication can be basically achieved, and the error is about one second."

The teacher is worthy of being a teacher. He immediately said the entire principle of mobile phone communication. Su Yu continued his words: "What you said is very clear. The principle of mobile phone is to convert sound into electrical signals, and the electrical signals are converted into electromagnetic waves. After propagation, it is then converted into electrical signals and converted into sound. I just now locked the other party's position through the other party's electromagnetic waves, and directly emitted electromagnetic waves to the other party, and then controlled his mobile phone and landline to talk to the other party."

Everyone was shocked and Long Shisan asked: "God, can you send electromagnetic waves directly?"

Su Yu said: "What I am using is technological means, but you can't understand for the time being."

The teacher was very amazed: "God, how high is your technological strength?"

The technological power that Su Yu mastered was beyond their understanding. They waited patiently. After a while, the fourth brother rushed here.

"Who is it? Who is pretending to be a ghost?"

The fourth brother stepped into the school and saw a person surrounding Su Yu in the center. Su Yu said: "I have already figured out what invention to use to participate in the competition. This object is at least twenty years ahead of your era."

The fourth brother was shocked, and he looked at Su Yu and asked, "Is it you?"

The teacher immediately spoke: "The fourth brother, don't be rude. This is the god who created all our sub-dragon tribes!"

"God?" Lao Si sneered, "There is no God in this world at all!"

The teacher continued to speak out: "The fourth brother, there is heaven beyond heaven, and there is someone beyond man. The scientific level of God is difficult for you to understand!"

The fourth brother said, "Don't believe it. This is just someone pretending to be a god and pretending to be the top of Longshan. God does not exist at all. Who can live on the top of Longshan Mountain for so many years?"

Long Shisan was furious: "You mean, am I lying? You don't understand the power of God at all."

Su Yu suddenly waved his hand: "It's okay, questioning God is the quality that a scientist should have. The fourth brother, next you will bring this item to the competition to ensure that you can win the championship."

The fourth brother's face froze: "Teacher, it's been so many years since you've learned the reality. Although you taught me a scientist, there are big accidental factors in it and you shouldn't continue to fantasize. I'm already doing this now."

The teacher said earnestly: "Fourth brother, your qualification was only D- at the beginning. If you hadn't been to another school, you would have been given up long ago. Why didn't you believe the miracle you created yourself?"

Lao Si gritted his teeth: "I admit, teacher, if you don't have your cultivation, I would never be able to become a scientist respected by everyone. But over the years, I have also given you countless grants, but you have not been able to copy another me. This only shows that your educational philosophy is still wrong!"

After hearing this, the teacher lowered his head, with only sadness and pain in his heart. He said helplessly: "Maybe I was really wrong, I am really old."

"No, Lao Si, you are wrong. Legend cannot be copied. If you want the teacher to copy another one, how is this possible? Great scientists have never been copied, and great students are the same." Su Yu said as he suddenly handed out an item, everyone was shocked. It was a small thin rectangular structure with a metal shell on one side and a black screen on the other side.

"What is this?" everyone asked in confusion.

Su Yu replied: "This is, a smartphone."

"Mobile phone!?" The group of people were surprised again. How could the mobile phone look like this?

Su Yu unlocked the smartphone and handed it to Lao Si: "For, since you are the only scientist on the scene, I think you should be able to use this thing."

"Hmph, it's just a cell phone. What can I do except make a phone call?" Lao Si took the cell phone and started fiddling with it.

In the first minute, he was full of disdain.

In the second minute, he was sweating profusely.

In the third minute, he was extremely shocked.

In the 4th minute, he smiled bitterly.

"This is no longer a mobile phone, this is almost a microcomputer." The fourth brother was completely convinced. He returned the smartphone to Su Yu, and his tone was no longer as dissatisfied as before.

The others immediately looked at the smartphone curiously, and Su Yu handed them the smartphone again, and they immediately started to study it.

After a moment, they all made a sound of admiration.

"Is this God's technological strength? It's so scary. We can easily upgrade our mobile phones to this level."

"The technological strength of God is so terrible. We can easily see through the technology of our mobile phones and upgrade and transform it at will."

Su Yu didn't say anything. This mobile phone was just made by him using nanorobots. He had transformed one of his 100 billion crystal brain cells into a nanorobot factory. Then he could make a large number of nanorobots anytime and anywhere.

And these nanorobots can also create the technological items they want in a very short time.

This is almost a state of turning stones into gold and turning objects out of thin air.

To reach this point, you must have a brain comparable to a supercomputer, and Su Yu's crystal brain can reach this level just so far. After all, his crystal brain is a collection of 100 billion human brains.

"You just use this smartphone to participate in the competition. I believe that no one's invention can surpass you."

The fourth brother hesitated for a moment, but said: "If you participate in the competition, you must not only bring the invention, but also announce the production process and production principles of the invention."

He was worried that Su Yu would not announce the principles of smartphones, after all, how powerful this technology is.

However, Su Yuman didn't care: "Is the principle? Let me tell you directly, it's not very complicated, nor is it a technology worth caring about. With your level of civilization, no problem will occur even if you master it."

Everyone was overjoyed. They were so curious about this smartphone.

"Listen, the principle of smartphones is nothing more than the following points."
Chapter completed!