Jiang Xingchen was stunned just now, not because he was shocked by the sound emitted by the speaker, but because he was happy. At first, he thought Xianning had developed wireless communication technology because Xianning had previously conducted Hertz's electromagnetic wave experiment.

But he didn't expect that what Xianning made was not wireless signal transmission, but microphone and speakers.

Compared with wireless signal transmission, the invention of these two things made him even more excited and excited, because these two inventions meant the implementation of acousto-electric conversion and also meant that the emergence of wired telephones would not be too far away.

In addition, there is another more important key issue, which is the amplification of sound. This shows that Xianning has developed a vacuum transistor so that the weak current can be amplified. Vacuum transistor is not only the key to wireless signal transmission, but also opens the door for the opening of the electronic age. The significance of its significance is self-evident.

Seeing Jiang Xingchen laughing happily, unlike something, Xian Ning breathed a sigh of relief and replied: "This was not what I invented, it was the result of Researcher Hong Min from the Electronics Laboratory! When he was studying AC current rectification, he accidentally discovered the amplification phenomenon of current, so he used this discovery to convert electroacoustics, and then invented the microphone and speaker!"

Jiang Xingchen nodded and said nothing. He knew only about this kind of knowledge. Now the university researchers have studied much more deeply, so he cannot make any suggestions.

However, he still put forward a few points. The knowledge cannot be put forward, but the effect can be done. For example, the distortion problem that just occurred, the noise reduction problem, and the material use of speakers, are all factors that affect the sound quality.

Xianning listened carefully, recorded these questions one by one, and then called the researchers from the electronics laboratory to explain the task. Jiang Xingchen also met the researcher named Hong Min, a tall and thin young man with messy hair, but he looked very energetic.

After being recognized by Jiang Xingchen, Hong Min was very excited. It was already evening and he plunged into the experiment.

Jiang Xingchen was going back, but Xianning refused to let him go and said she wanted to chat with him. Her favorite thing was to chat with Jiang Xingchen. Jiang Xingchen couldn't bear to sweep away Xianning's interest, and was happy, so she sat on a chair to discuss with her. From the principle of sound and electricity conversion, to the application of radio waves, to the exploration of basic physics theories

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

"This time I brought back a lot of ores. You can look back and see if there is any usefulness for synthesis of ammonia!" Jiang Xingchen said and stood up.

"Okay! I'll start tomorrow, you go back. Leave you until so late. Sister Chuxue and Mei'er should have an objection!" Xian Ning said with a smile.

Jiang Xingchen glanced at Xian Ning in surprise. She had never joked like this with her before.

Just as he looked at Xian Ning, Xian Ning also looked at him, and his heart immediately trembled. Xian Ning's eyes made him feel a little panicked, and his breathing became rapid.

"Then I have to try the microphone and speaker before leaving!" Jiang Xingchen hurriedly found a bad excuse to change the topic, then ran to the corner inside, and picked up the round microphone.

"Xian Ning, please dodge a little, block your ears, and don't shake you!" Jiang Xingchen signaled in a low voice.

"Oh!" A disappointed expression flashed across Xian Ning's face, then nodded and agreed, covering her ears with both hands and stayed away from the speaker.

"What are you talking about?" Jiang Xingchen was thinking with the microphone, and the laboratory door was suddenly pushed open. Zhao Danqing rushed in quickly, and walked to the middle of the room, opening his mouth and shouting.

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

Zhao Danqing was in the middle of the room, and was facing the trumpet. His face turned pale by the throat. He felt his brain beating constantly in his head, and he could not hear any other sound in his ears except for the buzzing beeps.

Jiang Xingchen and Xianning then realized that it was Zhao Danqing, so they hurried over and asked him how he was.

But Zhao Danqing couldn't hear what they were saying at all, just staring at the two of them dumbly, thrusting the muscles on their faces.

Jiang Xingchen and Xianning looked at each other, and at the same time raised Zhao Danqing's arm and dragged the guy to the playground outside.

After being blown by the mountain wind at night for a long time, Zhao Danqing slowly came to his ears, and various sounds from the summer night came back to his ears.

"Brother, I heard Lao Budhi say that you have the ability to call lion roar, as powerful as Tai Chi. What I just said was that he was so scary. My mind was almost shaken into a paste!" Zhao Danqing looked at Jiang Xingchen and asked with lingering fear.

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

After hearing Jiang Xingchen's question, Zhao Danqing immediately turned into a bitter face: "Brother, you can't ignore this matter. The silver robe was taken away by the old man! I looked for you everywhere, and finally I knew you were here, so I came. The private soldiers would not let me in. I spent a bottle of Yuanqi wine to let Dabai bring me in."

"What?" Jiang Xingchen was stunned and asked, "Didn't I send private soldiers to ask you for it? Why was it still snatched away by that old guy?"

"It's too late for the people you sent! I'm so fooled by the old man!" Zhao Danqing patted his legs and shouted.

"Old Zhao, don't worry. I talked with Grandpa Fu for more than three hours at home, but I didn't see the private soldiers coming back to report!" Jiang Xingchen said with a stern face.

"I wasn't at home at all. I was wearing a silver robe all afternoon looking for an old thing. I only found him during dinner, and then I was stolen! The private soldiers you sent found me later," Zhao Danqing explained.

Jiang Xingchen pointed at Zhao Danqing, so angry that he wanted to curse him. He had never seen such a singular person. Even the children could hear the old immortal provocation. You can't hear it?

Finally, Jiang Xingchen stopped and said angrily: "It's time! I told you to hand over your clothes to Mei'er into the warehouse, but you robbed yourself! Why haven't I punished you yet?"

"Brother! I'm not a custodian. I just want to wear it for two days and then put it back. Who knows that I'm so stupid?" Zhao Danqing looked aggrieved.

"Then I don't care. Anyway, you have lost your clothes, and if you don't go back, you'll be robbing yourself!" Jiang Xingchen said unreasonably.

Zhao Danqing's eyes rolled and she whispered: "Brother, I can grab the clothes back!"

"You still want to snatch things from Lao Bushen?" Jiang Xingchen gave him a disdainful look.
Chapter completed!