"Your Majesty, Your Ladyship, if you listen carefully, you will realize that this telegraph machine can actually emit two types of sounds. One is a short sound like this. When the people on the other side receive this signal, they can record it as a dot and read it as" di ". The other type is a long sound that lasts for a certain period of time. When the people on the other side receive this signal, they can record it as a horizontal line and read it as" da ". Your Majesty and Your Ladyship can listen carefully!"
Drunken Wind Pavilion.
In order to clearly explain the telegraph machine's communication mechanism to Li Er and Zhangsun, Li Zexuan explained the principle while personally operating the telegraph machine. In fact, the principle was very simple. It was nothing more than controlling the telegraph machine to emit two different types of signals based on the length of time the switch was closed.
"En, that's indeed the case. But with just these, I'm afraid they can't transmit the message, right?"
When Li Er saw Li Zexuan's demonstration, he was amazed by the telegraph machine's magic and asked doubtfully.
"Your Majesty, with just these two monotonous signals, of course, it can't completely express the meaning of both parties. This telegraph machine also needs to be used in conjunction with a codebook."
Li Zexuan explained with a smile.
"What's a codebook? Kid, can't you say it all at once? "
Li Er frowned and said unhappily. This kid dared to deliberately use a bridge in front of him, he was really bold ~!
"Uh, replying to Your Majesty, I just said that the two types of signals emitted by the telegraph machine can be recorded as dots and horizontal lines. I later combined the dots and horizontal lines, and each combination represents a number. For example, a dot with four horizontal lines represents the number" 1 ", and the rest of the numbers so on. There are a total of ten numbers, and then the sender can combine the four numbers to represent a word. In this way, there are ten thousand combinations. In other words, through this method, it is possible to express ten thousand different words! And the corresponding text of each combination is the codebook that I mentioned! "
Li Zexuan stood with his hands behind his back and spoke with a little bit of confidence. This guy thought that since it was a rare opportunity to show off in front of Li Er, it would be a waste not to show off.
In fact, what he had just said was the famous Morse code in the modern history of the world. In 1832, the Russian diplomat Schilling built a machine for receiving messages by means of the deflection of a galvanometer pointer. Later, in 1835, after three years of research, the American painter Morse successfully used the "on and off" and "length" of electric current to replace human words for transmission.
Morse code was an early form of digital communication, but unlike modern binary codes that use only zeros and one or two states, it consisted of five types: dots, dashes, pauses between dots and dashes, short pauses between each character (between dots and dashes), medium pauses between words, and long pauses between sentences. Then, using different combinations of dots and dashes, representing 26 English letters and 10 Arabic numerals, the communication could be achieved perfectly.
One interesting thing was that the international distress signal SOS was not an abbreviation of any English word. It was just that its code was "…" (three dots, three long, three dots). In Morse code, the corresponding letter was SOS.
Later, Morse code was introduced to China. In order to adapt to the Chinese language, it was modified. It was almost like what Li Zexuan just said, but there were a few more combinations on the original basis.
Li Zexuan was frowning and thinking, so he didn't notice Li Zexuan's annoying look. Otherwise, he would have given him two big feet. Empress Zhangsun inadvertently glanced at Li Zexuan's expression, and she couldn't help but want to laugh.
"I see! Kid, your idea is really good! But according to what you said, the codebook can be changed at will? "
Li Er himself was a person with great wisdom. Putting aside the knowledge of electromagnetism that didn't belong to this era, he could still understand the principles of the combination of codes.
"Your Majesty's eyes are really sharp! Just as Your Majesty said, this codebook can be changed according to needs. As long as both parties use the same codebook, there's no problem! It is precisely due to the ever-changing nature of the telegram code that guarantees the safety of the message between the two parties. This way, even if the message is intercepted, the other party won't be able to understand the meaning of the message just by looking at the dots and strokes! "
When Li Zexuan heard Li Er's question, his eyes lit up. He secretly thought that the ancient people weren't stupid. He just had more knowledge than them.
"Ha! Don't flatter me, kid! Oh, according to what you said just now, could it be that the message sent by this telegraph can be intercepted by others? "
Li Er was secretly happy, but on the surface, he laughed and scolded. However, he was a little puzzled. In his opinion, the message sent by this telegraph was silent and invisible. How could it be intercepted?
"Your Majesty, the message sent by the telegraph is actually equivalent to the military messenger sending military intelligence through text. They both have the possibility of being intercepted! As long as you have a high-power transceiver and adjust the receiving frequency of this transceiver to the corresponding wave band, you can capture the telegraph message sent by others. Of course, this is only in theory. This is because in the whole world, I am the only one who is proficient in the production principle of the telegraph! "
Nothing was invincible. Although the electromagnetic waves emitted by the telegraph were invisible and silent, as long as the method was right, it could still be captured. In some anti-Japanese war TV series, there were often plots of underground parties intercepting and deciphering the enemy's telegrams!
"In the military ~ ~"
Li Er's heart skipped a beat as he muttered to himself. Although he didn't know what "power," "frequency," and "wave band" were, this didn't prevent him from obtaining other key information. At this time, he looked at the telegraph on the table again, and his eyes slowly became more and more passionate. This was the divine weapon of the country! With this telegraph, wouldn't the Tang Empire be in an invincible position in future wars?
He had fought in wars all his life, and he immediately thought of the huge role this telegraph would play in the military.
"You just said that in the whole world, you are the only one who is proficient in the production principle of the telegraph?"
Li Er narrowed his eyes and looked at Li Zexuan as he spoke.
Uh, Li Zexuan's heart tightened. He felt a trace of danger. Did he just show off too much?
"Your Majesty, it should … should be like this!"
Li Zexuan couldn't hear anything wrong from Li Er's tone, so he could only bite the bullet and answer.
"Can this telegraph be mass produced? Can it be used for the transmission of intelligence in the military? "
Li Er's face didn't have any special expression, but there was a trace of hope in his heart.
"This …"
Li Zexuan wanted to curse in his heart. Sure enough, Old Li wanted all the good things that he saw! What a robber!
"Your Majesty, the telegraph is currently only in the experimental stage. Its transmission distance and working time are not stable. I can use it to chat with Yuxi, but if it is used for the transmission of intelligence in the military, we first need to solve the problem of its power supply, and then the problem of its signal transmission distance …"
"Chat? You're actually planning to use this telegraph to chat? "
Before Li Zexuan could finish, Li Er couldn't help but interrupt. Li Er's eyes were wide open, and he looked like he wanted to eat someone. If it wasn't for Zhangsun beside him, he would have pulled out his sword and chopped Li Zexuan into pieces and fed him to the dogs!
"Uh, Your … Your Majesty!"
Li Zexuan cursed in his heart. In a moment of desperation, he spilled the beans. This was a pill! The robber was going to eat someone!
.....
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