Jiang Xingchen was stunned just now, not because he was shocked by the sound released by the speaker, but because he was happy. At first, he thought that Xian Ning had developed wireless communication technology, because Xian Ning had done Hertz electromagnetic wave experiments before.

But he didn't expect that what Xian Ning came up with was not wireless signal transmission, but microphones and speakers.

Compared with wireless signal transmission, the invention of these two things made him more excited and excited, because these two inventions mean the realization of sound and electricity conversion, and also mean that the appearance of the corded telephone will not be too far away.

In addition, there is an even more important key issue, which is the amplification of sound. This shows that Xian Ning has researched a vacuum triode, so that the weak current can be amplified. The vacuum transistor is not only the key to wireless signal transmission, but also opens the door to the opening of the electronic age, and its significance is self-evident.

Seeing Jiang Xingchen laughing happily, not looking like he was in trouble, Xian Ning breathed a sigh of relief and replied: "This is not my invention, it is the result of researcher Hong Min of the electronics laboratory! When he was studying alternating current rectification, he accidentally discovered the amplification phenomenon of electric current, so he used this discovery in electroacoustic conversion, and then he invented the microphone and speaker!"

Jiang Xingchen nodded and didn't say anything. He knew very little about this kind of knowledge, and now that the researchers at the university were much more researched, he couldn't make any suggestions.

However, he still made a few points, which could not be put forward in terms of knowledge, but could be in terms of effect. For example, the distortion problem just now, the other is the problem of noise reduction, and the material problem of the speaker, these are all factors that affect the sound quality.

Xian Ning listened carefully, recorded these problems one by one, and then called the researchers in the electronics laboratory to explain the task. Jiang Xingchen also got to know the researcher named Hong Min, a tall and thin young man with messy hair, but he looked very energetic.

With Jiang Xingchen's approval, Hong Min was very excited, it was already night, and he plunged into the experiment again.

Jiang Xingchen was going back, but Xian Ning wouldn't let him go, saying that he wanted to talk to him. What she likes the most is to chat with Jiang Xingchen. Jiang Xingchen couldn't bear to sweep away Xian Ning's interest, and he was happy in his heart, so he sat on the chair and discussed it with her. From the principle of acoustic-electric conversion, to the application of radio waves, to the exploration of fundamental physics theories

Unconsciously, it was late at night, Hong Min and the others went back to rest, and Xian Ning realized that it was too late. And Jiang Xingchen also remembered that the ore he brought had not yet been handed over to Xian Ning.

"This time I brought back a lot of ore, you go back and study it to see if it is useful for synthetic ammonia!" Jiang Xingchen said and stood up.

"Okay, I'll do it tomorrow, you can go back." Leave you so late, Sister Chuxue and Mei'er should have an opinion when they turn back!" Xian Ning said with a smile.

Jiang Xingchen glanced at Xian Ning in some surprise, she had never made such a joke with herself before.

Just when he looked at Xian Ning, it happened that Xian Ning also looked at him, and his heart immediately trembled. Xian Ning's eyes made him a little flustered, and his breathing unconsciously became short.

"Then I'll have to try the microphone and speakers before I go!" Jiang Xingchen hurriedly found a lame excuse to change the topic, then ran to the corner inside and picked up the round microphone.

"Xian Ning, you dodge a little, plug your ears, don't shock you!" Jiang Xingchen whispered.

"Oh!" The disappointed expression on Xian Ning's face flashed, and then she nodded in agreement, covering her ears with her hands and moving away from the speaker.

"What do you say?" Jiang Xingchen was pondering with the microphone, and the door of the laboratory was suddenly pushed open, Zhao Danqing broke in, walked to the middle of the room, and opened his mouth to shout.

It was already late at night, the laboratory was very quiet, and Jiang Xingchen was thinking about things again, but he was startled by Zhao Danqing, and couldn't help shouting: "Who!"

Zhao Danqing was in the middle of the room, and he was facing the horn, his face turned white from this voice, and he felt that his brain was beating in his head, and he couldn't hear any other sound in his ears except for the buzzing buzzer.

Jiang Xingchen and Xian Ning found out that it was Zhao Danqing, and hurriedly ran over and asked him loudly how he was.

But Zhao Danqing couldn't hear what they said at all, just looked at the two of them blankly, and the muscles on his face twitched.

Jiang Xingchen and Xian Ning glanced at each other, and at the same time set up Zhao Danqing's arm and dragged the goods to the playground outside.

After being blown by the mountain wind in the night for a while, Zhao Danqing slowly eased up, and the various sounds of the summer night came into his ears again.

"Brother, I heard the old immortal say, you will have a kind of ability called lion roar gong, as powerful as tai chi, just now it was so scary, my brain was almost shocked into a pulp!" Zhao Danqing looked at Jiang Xingchen and asked with palpitations.

"What kind of lion roar, that's the microphone and speaker that the laboratory just invented, why did you come here so late? The private guards of the university didn't stop you?" Jiang Xingchen explained, and then asked.

Hearing Jiang Xingchen's question, Zhao Danqing immediately turned into a bitter gourd face: "Brother, you can't ignore this matter, that silver robe was snatched away by the old immortal!" I looked for you everywhere, and finally knew that you were here, so I came, and the private soldiers didn't let me in, and I spent a bottle of vitality wine to let Dabai bring me in,"

"What?" Jiang Xingchen was stunned for a moment and asked, "Didn't I send a private soldier to ask you for it?"

"It's too late for you to send someone! I'm an old immortal!" Zhao Danqing slapped his leg and shouted.

"Lao Zhao, don't get into trouble, I talked to Grandpa Fu at home for more than three hours, and I didn't see the private soldiers come back to report!" Jiang Xingchen said with a straight face.

"I'm not at home at all, and I spend the afternoon looking for old things in my silver robe. As a result, I found him at dinner, and then he was robbed!

Jiang Xingchen pointed at Zhao Danqing, so angry that he didn't know how to scold. I've seen two, I've never seen two, the old immortal radical law can even be heard by children, can't you hear it?

In the end, Jiang Xingchen withdrew his hand and said angrily: "Yes, I told you to hand over your clothes to Mei'er for storage, but you ended up stealing from yourself!

"Brother, I'm not a prison guard and a thief, I just want to wear it for two days to show off, and then put it back, who knows that the old immortal is so slippery" Zhao Danqing's face was full of grievances.

"Then I don't care, anyway, you lost your clothes, and if you don't go back, you'll be stolen by the guards!" Jiang Xingchen said unreasonably.

Zhao Danqing rolled his eyes and said in a low voice: "Brother, I can snatch the clothes back!"

"You still want to snatch something from the old immortal?" Jiang Xingchen gave him a disdainful look.

"Just lend me the microphone and speakers!" Zhao Danqing said, showing a grim smile: "Hehe, that's a good thing for Yin people!" (To be continued.) )