Otaku Engineer in Great Tang Dynasty

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"Your Majesty, Niangniang, if you two listen carefully, you will find that this telegraph can actually make two kinds of sounds, one is such a short sound, and the person on the other side receives this signal and can record it as a dot, It is pronounced "di", and there is another kind of long sound that can last for a certain period of time. The person on the other side can record it as a horizontal line after receiving this mark, and read it as "ta". Your Majesty and the Empress can listen carefully. Listen to it!"

Drunk Fengxuan.

In order to explain the transmission mechanism of the telegraph clearly to Li Er and Zhangsun, Li Zexuan went forward to operate the telegraph while explaining the principle. In fact, the principle is very simple. Control the telegraph to send out two different signals.

"Well, that's true, but just based on these alone, I'm afraid I can't pass the message, right?"

Seeing Li Zexuan's demonstration, Li Er asked in doubt as he was amazed at the magic of the telegraph machine.

"Your Majesty, these two monotonous signals alone cannot fully express the meaning of the two sides of the message. This telegraph needs to be used in conjunction with the codebook."

Li Zexuan explained with a smile.

"What's a codebook? You kid won't finish it all at once?"

Li Er frowned and said displeasedly, he dared to deliberately take the bridge in front of him, this kid is really daring and fat~!

"Uh, back to Your Majesty, the minister said just now that the two signals sent by the telegraph can be recorded as dots and horizontal lines. The minister later combined the dots and the horizontal lines, and each combination represented a number, such as Say a dot and four horizontal lines represent the number "1", and the rest of the numbers are analogous, there are ten numbers in total, and then the sender can combine the four numbers to represent a word, so that there are 10,000 kinds of The combination method, that is to say, through this method, 10,000 different words can be expressed! And each combination, the corresponding word is the codebook that the minister said!"

Li Zexuan stood with his hands behind his back, and talked with a bit of pretense, what this guy thinks is that it is rare to have the opportunity to pretend in front of Li Er, not pretending to be in vain.

In fact, what he just said is the famous Morse code in the modern history of the world. In 1832, the Russian diplomat Shirin made a machine that used the deflection of a galvanometer needle to receive information. Later, in 1835, after three years of study by American painter Morse, he successfully used the "on and off" and "length" of electric current to replace human words 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 states. Its codes include five types: dots, strokes, pauses between dots and strokes, short pauses between characters (between dots and dashes), medium pauses between each word, and long pauses between sentences. Then use different combinations of dots and dashes, representing twenty-six English letters and ten Arabic numerals, to achieve perfect communication.

There is a more interesting thing, that is the international general distress signal sos, in fact, it is not the abbreviation of any English word, just because its code "...---..." (three o'clock, three long, three o'clock) ), in Morse code, the corresponding letter is just sos.

Later, Morse code was introduced into China. In order to adapt to Chinese, it underwent some improvements. It was almost as Li Zexuan just said, but it was based on the original, with some more combinations.

Li Er was frowning and thinking, but he didn't pay attention to Li Zexuan's ill-fated appearance, otherwise he would have to reward them with big feet. Empress Zhangsun caught a glimpse of Li Zexuan's expression inadvertently, and she couldn't help but want to laugh.

"So that's the case! Your kid's idea is really good! But according to what you said, can't the so-called codebook 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 the principles of these password combinations alone.

"Your Majesty's eyes are like a torch! As Your Majesty said, this codebook can be changed at will according to needs. As long as both parties to the message use the same codebook, there is no problem! It is precisely because of the ever-changing characteristics of telegraph passwords, Only by guaranteeing the security of the two people's messages to each other, even if the messages sent are intercepted, others will not know what the messages represent when they look at the dots and dashes!"

Li Zexuan listened to Li Er's question, his eyes lit up, and he secretly said that the ancients were not stupid, and he only had more knowledge than them.

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

Li Er's heart was dark, but he scolded with a smile on his face, but he was a little puzzled. When he wanted to come, the message sent by the telegraph was silent and invisible on the way, how could it be intercepted?

"Go back to Your Majesty, the telegraph transmitting information is actually equivalent to the military messenger transmitting military information through text. They all have the possibility of being intercepted! Just need a high-power transceiver, and then adjust the receiving frequency of this transceiver to Corresponding frequency band, you can capture the telegram information sent by others. Of course, this is only the possibility of being intercepted in theory, because the production principle of the telegraph machine is only proficient in the whole world!"

Nothing can be invincible. Although the electromagnetic waves emitted by the telegraph are invisible and soundless, they can still be captured as long as the method is appropriate. In some anti-Japanese TV dramas, it is not often that some underground parties intercept and decipher the enemy's telegrams. !

"Military~~"

Li Er's heart moved, and he muttered to himself, although he didn't know

What the hell are "power", "frequency", and "band", but this did not prevent him from obtaining other key information from it. At this time, he looked at the telegraph on the table again, and his eyes slowly became more and more hot. But the artifact of the country! With the telegraph machine, wouldn't the Tang Dynasty be invincible in the war in the future?

He had fought all his life, and he immediately thought of how great the telegraph would be if it were used in the army.

"You just said that you are the only one in the world who is proficient in the making of telegraph machines?"

Li Er narrowed his eyes, looked at Li Zexuan and said.

Eh, Li Zexuan's heart tightened, he felt a hint of danger, did he just pretend to overdo it?

"Go back to Your Majesty, it should be... it should be like this!"

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

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

There was no special expression on Li Er's face, but there was a trace of hope in his heart.

"This...."

Li Zexuan wanted to scold his mother in his heart, and sure enough, Lao Li wanted anything good when he saw it! What a robber!

"Your Majesty, the telegraph is currently only in the experimental stage, and its transmission distance and working hours are not stable. It's okay for a small minister to use it to chat with Yuxi, but if it is used for military intelligence transmission, it needs to be first. Solve its power supply problem, and then its signal transmission distance problem..."

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

Before Li Zexuan could finish speaking, Li Er couldn't help interrupting, and saw him staring at him with an expression of wanting to eat people. If the eldest grandson hadn't been by his side, he would have pulled out his sword and chopped Li Zexuan to feed the dog. !

"Uh, Your Majesty... Your Majesty!"

Li Zexuan secretly shouted that he was going to suffer, but Te Niang's momentary impatience leaked out, this is a pill! Robbers are going to eat people!

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