Seeing how anxious he was, Liu Weichao couldn't help but laugh, and then said seriously: "A wired phone is similar to the mobile phone you use. It's just connected to a line. It mainly consists of three parts. The first one is the speaking part...
"
As far as the Ming Dynasty is concerned, even those top students in physics in the Royal Academy of Sciences may not be more receptive to Liu Weichao's explanations than Emperor Chongzhen.
This is not only because Emperor Chongzhen had a mobile phone, but also the textbooks Liu Weichao gave to the Ming Dynasty did not have examples of applications to explain. After all, these are top-secret patents for this plane and cannot be spread.
of.
No, when Emperor Chongzhen heard what Liu Weichao started to say, he nodded to show that he understood, and then continued.
"...This thing is called a microphone when it is independent. Of course, this is the name in my world, because it was invented by Xiyi first, so it is translated from foreign languages, which literally means micro-amplifier. It is mainly used to convert sounds into
Electrical signal!" At this point, Liu Weichao thought of something, smiled, and reminded Emperor Chongzhen, "As for your plane, what name you want to give it is naturally up to you to decide!"
Whether it is the Chongzhen brand micro-amplifier, the Tian Guifei brand, or the Zhou Queen brand, these have nothing to do with Liu Weichao.
When Emperor Chongzhen heard this, he knew that Liu Weichao was making fun of him, but he was already very thick-skinned towards Liu Weichao, so he remained unmoved and just urged: "Continue!"
A bit boring! Liu Weichao commented in his mind, and then continued: "The second part is the listening part. This thing is actually a reduced version of the speaker. When it is enlarged, it becomes a speaker. There is basically no difference in structure."
At this point, he knew that Emperor Chongzhen might not understand the most common words in his plane, so he explained to him: "The speaker uses electrical signals to convert them into sounds, and then puts them out for everyone to hear. The same goes for speakers.
It has the same function, but the situations in which it is used will be different.”
Emperor Chongzhen listened and nodded, understanding all of this. His mobile phone is only for listening and speaking, doesn't it have both!
Then, he remembered that Liu Weichao said that there were three parts in total. He could listen and speak, so how could there be a third part?
Thinking of this, Emperor Chongzhen immediately asked with a little curiosity, and at the same time with a little urging tone: "What about the third part?"
"Of course it's the ringtone!" Liu Weichao heard it and immediately replied, "If it wasn't the ringtone reminder, how would others know that a call was coming, right? In wired phones, it's the electric bell, which can also be used independently in different situations.
!”
At this point, he was afraid that Emperor Chongzhen still didn't understand what these three parts were like, so he immediately searched on the computer, and then said to Emperor Chongzhen: "Let me show you the actual use. Look, I'll explain.
"
As he spoke, he moved the phone holder, pointed it at the computer screen, and then clicked on the found video for Emperor Chongzhen to watch.
"See, there are so many people here. When the person standing on the stage speaks, the people at the back can hear it clearly. It's because of the loudspeaker in his hand, also called a hand-held loudspeaker. This is the simplest way to have a loudspeaker.
It’s a practical application! You can use it in the future when you want to speak to your ministers, review the army, etc.”
"Did you see this in the second video? It's also a loudspeaker mounted high up, connected by wires. The speaker is inside the house, but his voice can be heard from the loudspeaker outside.
Very far. In the same way, you can also use it if you have a notice there, but I don’t think you will need it."
As an emperor, there are many people to take care of it, and there is no need for the emperor to shout into the microphone: The cabinet is coming to the Wenhua Hall for a meeting!
With this in mind, Liu Weichao began to explain the third video: "There is also the doorbell. Press the button at the door and the bell will ring inside the house. This can avoid knocking on the door outside and not being able to hear it inside the house.
arrive!"
Having said this, Liu Weichao reached out and turned the phone holder back to face his own face, and then looked at Emperor Chongzhen. Suddenly, he found that Emperor Chongzhen's face seemed to be very interested, and he couldn't help but feel a little puzzled.
.
Emperor Chongzhen didn’t need this function! Even if he wasn’t an emperor, ordinary wealthy families would have concierges. That was the function of the doorbell, so there was no need for this doorbell!
Putting aside this idea, Liu Weichao said to Emperor Chongzhen: "I will pass the information to you later, but for now, I will explain the basic principles to you. If you can understand it, you can explain it to your ministers later.
time, it will be easier for them to understand!”
At this point, he added in his mind: I'll let you pretend it by the way!
Sure enough, Emperor Chongzhen looked very interested and immediately nodded and said: "You speak, I listen!"
Seeing how serious he looked, Liu Weichao became more and more sure that he was better at this, so he told Emperor Chongzhen: "Of these three parts, the simplest is the electric bell. Its main principle is to make an electromagnetic bell.
Iron is used to attract a reed, and an iron block is installed on the reed as a striking head. When the electromagnet is activated, the reed is attracted and strikes the clock or another piece of iron, which produces a sound."
When Emperor Chongzhen heard this, he couldn't help but be surprised and said: "That's it?"
Before, he had the impression that the telegraph was simple and the telephone was too difficult. However, the principle of listening to the electric bell at this time turned out to be very simple! Even if it sounds ugly, he can do it without the need for craftsmen.
But who would have thought that when Liu Weichao heard him say this with a little contempt, he asked him: "Then let me ask you, how do you make continuous sounds? That is, continuous tapping?"
"..." When Emperor Chongzhen heard this, he opened his mouth to answer. However, when he opened his mouth, he found that he didn't know what to say?
Fortunately, Liu Weichao did not embarrass him and immediately gave the answer so that he would not be embarrassed: "Just use this reed as a current circuit breaker! To explain in detail, when the reed does not move when it is not energized, part of it contacts
The wire is regarded as part of the circuit. When the switch is turned on and the power is turned on, the reed will be attracted by the electromagnet to ring the bell. Because it leaves the original position, the circuit is broken, so knocking will cut off the power, the electromagnet will be demagnetized, and the reed will be
It elastically resets. But as soon as the reed resets, the current flows again, so the electromagnet generates magnetism again, attracts the reed to ring the bell again, and then cuts off the power... This cycle repeats until the switch is opened to cut off the main circuit."
"Oh, so that's it!" Emperor Chongzhen actually didn't care at all about appearing ignorant in front of Liu Weichao. After all, there was a difference of more than four hundred years, and ignorance was reasonable. "I understand! Continue!"
But even so, he kept the question and the answer in his heart.
Liu Weichao continued: "Next is the earpiece. The principle is basically similar to that of an electric bell. It uses an electromagnet to attract the cavity membrane to vibrate. Usually it uses a thin metal sheet, but there are also high-end audio methods, which are wrapped with a thin cloth membrane or leather membrane.
Cover a small cavity (i.e. a miniature drum), then place a small iron block or a small magnet on the back of the cloth film, and use an electromagnet to attract its vibration. As for the current that starts the electromagnet, it naturally comes from the microphone at the other end."
Emperor Chongzhen listened and nodded without speaking, appearing very focused.
So, Liu Weichao continued to say to him: "Finally, there are microphones. There are two types here, one is a magnet phone and the other is a toner phone. The magnet phone has a flaw, that is, the current is completely generated by sound, so the intensity
It’s quite small, the transmission distance is not far, and the sound is relatively vague.”
As soon as he said this, he saw a look of disgust on Emperor Chongzhen's face. Obviously, he looked down on this kind of phone call that had a short transmission distance and a vague sound.
Thinking about it, it is for long-distance communication. If it is at a short distance, someone can directly use it to pass it.
After Liu Weichao discovered this, he looked at the information on the computer and introduced the second type of phone: "The structure of the toner phone is quite simple, it just requires ingenuity. Some parts require minor processing, such as hammering them into very small pieces.
Thin copper sheets, wooden insulating boxes containing toner, electrode copper sheets at the bottom, and screws for fixing, etc..."
He didn't know this information before. Because he wanted to be a military advisor, he had already checked it out and reviewed it. Then he took a look at the information and explained it to Emperor Chongzhen, and he looked very knowledgeable.
Speaking of which, learning more is really useful. At least by learning this knowledge, Liu Weichao knew that when he used to watch movies, he would shake the old-fashioned hand-cranked telephone for a while before making a call, and then pick up the phone and start "Hello"
"Hey, hey", if you get the answer, you talk, but if you don't get the answer, you shake the handle again, what the hell is going on!
There is no other reason. Shaking the handle of the phone will make the phone on the opposite side ring, reminding you to answer the call. Pick up the phone and hear no sound, so you can only continue to shake the handle.
After basically explaining the principles of wired telephones, Liu Weichao glanced at the computer again, and then said to Emperor Chongzhen: "What I just said is the basic principles of telephones. In addition, if you want to make long-distance calls, you need to use a double phone.
Twisted wire and relay signal amplifier are both simple. For example, twisted pair wire is actually two insulated copper wires twisted together at a certain density. The radio waves radiated by each wire during transmission will be transmitted by the other wire.
The radio waves emitted on the line are offset, effectively reducing the degree of signal interference..."
In fact, there are automatic switches, but he is not going to continue talking about it, and there is no need. It is too advanced for Daming at this time. The basic ones have been solved first, and it is not troublesome to replace it manually.
After hearing this, Emperor Chongzhen was very excited and immediately urged Liu Weichao to pass all the information to him. Then, he decided to summon Fang Yizhi!