Otaku Engineer in Great Tang Dynasty Chapter 285: The robber wants to eat people!

"Your Majesty, Madam, if you two listen carefully, you will find that this telegraph machine can actually make two sounds, one is such a short sound, and the person on the other side receives this signal and can record it as One point is pronounced "di", and the other is such a long sound that lasts for a certain period of time. The person on the other side receives this mark and can write it as a horizontal line, pronounced "ta", Your Majesty and Niang Niang You can listen carefully!"

Zuifengxuan.

In order to explain the transmission mechanism of the telegraph to Li Er and the grandson, Li Zexuan explained the principle while personally operating the telegraph. In fact, the principle is very simple, nothing more than the time it takes to close the telegraph. Long and short, to control the telegraph to send out two different signals.

"Well, it's true, just relying on these alone, I'm afraid I can't deliver the message, right?"

When Li Er saw Li Zexuan's demonstration, he was surprised by the magic of the telegraph in his heart, and asked questioningly.

"Your Majesty, only with these two monotonous signals, of course, it is impossible to fully express what the two parties want to express. This telegraph machine also needs to be used with a codebook."

Li Zexuan explained with a smile.

"What is a cipher book? You kid won't finish talking all at once?"

Li Er frowned and said unhappily, dare to deliberately take the bridge in front of him, this kid is really courageous~!

"Uh, back to your majesty, the minister just said that the two signals sent by the telegraph can be recorded as a dot and a horizontal line. The minister later combined the dot and the horizontal line. Each combination represents one. Numbers, for example, one point and four horizontal lines represent the number "1", and the rest of the numbers can be deduced by analogy, a total of ten numbers, and then the sender can combine the four numbers to represent one word, so that there will be Ten thousand combinations, that is to say, through this method, ten thousand different characters can be expressed! And the corresponding text for each combination is the codebook that Xiaochen said!"

Li Zexuan stood with his hand in hand, and talked with a bit of pretense. What this guy thinks is that there is a rare opportunity to act in front of Li Er.

In fact, what he just said is the famous Morse code in the modern history of the world. In 1832, Russian diplomat Schilling produced a machine that uses the deflection of the pointer of a galvanometer to receive information. Later, after three years of research in 1835, the American painter Morse succeeded in replacing human characters with the "on-off" and "length" of the current for transmission.

Morse code is an early form of digital communication, but it is different from modern binary codes that only use zero and one or two states. Its codes include five types: dot, stroke, dot and stroke Pauses, short pauses between each character (between dots and strokes), medium pauses between each word, and long pauses between sentences. Then use different combinations between dots and strokes to represent twenty-six English letters and ten Arabic numerals, which can perfectly realize communication.

Later, Morse code was introduced into China, and it was improved a lot. It was almost the same as what Li Zexuan just said, but it was based on the original foundation with some more combinations.

Li Er was frowning and thinking, but didn't pay attention to Li Zexuan's undue beating, otherwise he would have to reward them for their big feet. Empress Longsun caught a glimpse of Li Zexuan's expression inadvertently, and she couldn't help but want to laugh.

"That's it! Your kid is really good! But according to you, the so-called codebook can be changed at will?"

Li Er himself is a man of great wisdom, aside from the electromagnetic knowledge that does not belong to this era, he can still understand these password combination principles alone.

"Your Majesty is so insightful! As your Majesty said, this codebook can be changed at will according to your needs. As long as the two parties sending the message use the same codebook, there is no problem! Officially because of the ever-changing telegram code This feature guarantees the security of the two messages passing each other, so that even if the message sent is intercepted by others, others look at the dots and dashes, and they don’t know what the messages represent!"

Li Zexuan heard Li Er's question, his eyes brightened, and the ancients were not stupid. What he has more than them is just some insight.

"Oh~! Don't flatter your kid! Oh, listen to what you just said, can the message sent by this telegraph machine be intercepted by others?"

Li Er was secretly refreshed, but he was smiling and cursing on his face, but he was a little puzzled. When he wanted to come, the message from this telegraph was silent and invisible while it was spreading. How could it be intercepted?

"Return to Your Majesty, the telegraph transmitting information is actually the same as the military messenger transmitting military information through text. They all have the possibility of being intercepted! All you need is a high-powered radio receiver, and then the radio receiver If the frequency is adjusted to the corresponding band, the telegram information sent by others can be captured. Of course, this is only theoretically possible to be intercepted, because the production principle of the telegraph machine is only proficient in the world!"

Nothing can be invincible. Although the electromagnetic waves emitted by the telegraph are invisible and silent, they can still be captured as long as they are properly used. In some anti-Japanese war TV dramas, it is not common for underground parties to intercept and decipher enemy telegrams. The plot!

"Military~~"

Li Er's heart moved and he muttered to himself. Although he doesn't know what the "power", "frequency", and "band" are, but this does not prevent him from obtaining other key information. I looked at the telegraph on the table again, my eyes slowly getting hotter~IndoMTL.com~ This is the magical weapon of the country! With the telegraph, wouldn't Datang be invincible in wars in the future?

He fought for a lifetime, and immediately thought of how great this telegraph machine would be if it were used in the military.

"You just said that you are the only one who is proficient in the production principle of the telegraph machine?"

Li Er squinted, looked at Li Zexuan and said.

Uh, Li Zexuan's heart is tight, he feels a little bit of danger, is it because he just pretended to be too much?

"My Majesty, it should be...it should be like this!"

From Li Er's tone, Li Zexuan couldn't hear anything wrong, so he could only bite the bullet and answer.

"Can this telegraph machine be mass-produced? Can it be used for military intelligence transmission?"

Li Er didn't have any special expressions on his face, but there was a glimmer of hope in his heart.

"This..."

Li Zexuan wanted to scold his mother a little, and as expected, Lao Li wanted anything good when he saw it! What a robber!

"Your Majesty, the telegraph is only in the experimental stage. His transmission distance and working hours are not stable. The minister can use it to chat with Yu Xi, but if it is used for intelligence transmission in the military, First, it needs to solve its power supply problem, and then its signal transmission distance problem..."

"Chat? Are you actually planning to use this telegraph machine to chat?"

Before Li Zexuan finished speaking, Li Er couldn't help but interrupt, and saw him staring, with an expression of cannibalism. If it weren't for the eldest grandson beside him, he would have to draw his sword and chop Li Zexuan. Feed the dog!

"Um, Your Majesty... Your Majesty!"

Li Zexuan secretly screamed that he was going to suffer, but Te Niang missed her mouth in anxious manner. This is a pill! The robber is going to eat people!

......................

(End of this chapter)