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Huang Zong's face was also swollen after his eyes and nose.

"Hey, brother, do you see that you can relieve your anger, you can open it with peace of mind now. Huang Sheng said, his eyes flashed, the meaning was obvious, this is to kill chickens and monkeys, sue Liu Meng, don't find any excuses for not cooperating, it's better to be honest, he is not good at stubble.

Huang Zong was dizzy from the beating, covering his face, and he didn't dare to hide, looking pitiful.

Liu Meng snorted lightly and said, "What do I want?"

"Isn't this all here, I forgot about it by you guys like this, take a look, it's complete?" Huang Sheng immediately smiled and took out a bag and handed it over.

Liu Meng took it back and looked at it carefully, a book of discrete signal processing, a book of the application of discrete signal processing functions in mat1ab, and a CD-ROM, which is the mat1ab software, which is almost the same as what he wrote, and couldn't help but glance at Huang Sheng, half a day's hard work has been collected, and it is really difficult for him.

"With these things, I'll do my best, but please take care of your people, I don't want to be disturbed anymore. Liu Meng still said coldly.

"I can absolutely guarantee this, no one will bother you again, get out of here. With that, Huang Sheng greeted the two of them, smiled at Liu Meng, and exited the real room.

After the three of them went out, Liu Meng secretly sneered, hey, Huang Zong was beaten like this, I'm afraid he needs to go to the doctor, he finally killed one, and the remaining two are relatively easy to deal with.

As soon as the door was closed, the bookshelf was pushed, and the appearance of the office was restored, Huang Zong covered his face and said aggrievedly: "Uncle." Why are you still beating me, it's obvious that the kid is not cooperative, I just want to teach him a lesson. ”

Huang Sheng had a cold face and said, "When I leave, how can I explain to you." Just be optimistic, whoever wants you to provoke him on your own initiative, this kind of technical talent has a temper, and if you force it too much, it can only backfire. ”

"It's not bad for me, uncle. Huang Zong said pitifully.

Huang Sheng raised his hand and wanted to whip him again. Huang Zong hurriedly dodged the past, lit a cigarette, and said, "Okay, don't pretend, what virtue do you have, don't I know." ”

After a pause, he said, "I repeat it." The two of you are just staying in this office, and you are not allowed to enter the real room without my permission, just observe the surveillance screen secretly, don't make trouble for me again, a pair of uneasy things. ”

"Uncle, once it's opened. Are you really going to give him money? 150,000 is not a small amount, if we do this to him, this kid won't report to the police to arrest us when he goes out. Huang Zong asked a little nervously, he didn't have time to think about it at first, but now that he was messing with Liu Meng like this, he was really shocked by his ruthlessness just now, and he began to be faintly scared in his heart.

"Hey, my yellow hair's money is so easy to earn, I still have to put it away, after the opening is completed. Teach you a good lesson. The uncle and nephew laughed tacitly, but Huang Zong smiled, pulling his face, eyes, and nose hurt.

Huang Sheng paused, and then said: "Report to the police, arrest us? Why? There is no physical evidence, he is a poor student." has no background of power, empty words, who believes it? Do you believe it? Or do you believe it?" Huang Sheng laughed and pointed at Huang Zong, and then pointed at Huzi and asked, sneering in his words, extremely proud.

"Of course I don't believe it, how can a child talk nonsense. Huang Zong said with a smile.

Huzi also touched his head innocently and replied, "I don't believe it either." ”

Huang Sheng also expected this, so he had no fear and didn't worry about the consequences at all.

"That's it, I'm afraid of a bird, in this ice city, isn't it the same as pinching an ant to death by playing-killing a student? As he spoke, Huang Sheng leaned back on the big leather chair, took a few puffs of cigarette very comfortably, and spit out a small smoke ring.

Huang Zong nodded again and again, with a sad face, and said, "Uncle, you see that my eyes, nose, and face are all injured, it can be regarded as a work injury, I have to go to the doctor." ”

Huang Sheng also knew that this nephew didn't have any skills, but fortunately, he was loyal, just now in order to appease Liu Meng, he slapped him a few times, and now it's time to give him a sweet date, threw out three thousand yuan to him, and said: "Now Liu Meng, this kid is quite obedient, there is a tiger on top, I am also here, give you half a day off, you go to see a doctor first." ”

When Huang Zong got the money, he immediately smiled, and slapped Huang Sheng a few words of sycophancy, and his heart immediately itched, thinking, Lao Tzu will go to a big health care first, the hospital, just take a look at it by the way, the more I think about it, the more I feel better, and I can't wait to leave immediately.

Huang Sheng then gave Huzi another 2ooo yuan, and said: "Take it, follow me to eat, you will definitely not treat your brother badly, this is done, you two, you will not have to worry about food and clothing in this life." ”

Huzi was naïve, took the money, clicked it in his hand first, laughed, and hurriedly put it in his pocket. Huang Sheng scolded in his heart, there is really a lack of strings in his brain, and Lao Tzu can give you less.

When the three of them laughed in the office, Liu Meng put the book "Discrete Digital Signal Processing" in front of him and pretended to read it in the real room, in fact, he didn't need to read it at all, he had already mastered this book.

Looking at it like this, his fingers were pointed at the book to write and draw, which was also a habit of Liu Meng when thinking about problems, no matter what, he liked to write it, but he didn't dare to write it on paper at this time, he was worried that Huang Sheng and others would see the clue from it, although the possibility was very low, but he couldn't take any more risks.

Take the brain as the paper, the hand as the pen, and think.

Micro high-voltage pulse power supply device, the required capacitors, electrolytic capacitors, diodes, three headers and other devices, are all in the real room, what is lacking, and the difficulty lies in the winding of the two transformers.

Both transformers must be high-frequency, and the iron core needs to use a ferrite core, which is very different from the 5ohz of the mains power frequency.

The first stage is a high-frequency resonant transformer, the resonant frequency is about 1ooo to 5ooohz as well, Liu Mengxun calculated in his mind, the capacitor capacity has a model of 2.2uF, then the leakage inductance of this high-frequency resonant transformer is about 1~5mh is the most suitable, step by step according to the resonant frequency formula calculation, the leakage inductance of 2mh is better to choose, and the resonant frequency is about 24oohz, which can not only meet the needs of high frequency, but also ensure the power supply needs of analog devices in the next level of boosting.

The parameters are secretly recorded in the mind, and the transformation ratio of the first-stage transformer is about 8. Using these two parameters to calculate the number of turns that need to be wound, which involves complex electromagnetic problems, Liu Meng could not calculate it for a while.

In the past, when Liu Meng opened his own products and needed to wind the transformer, he usually built a simple resonant circuit to directly test the leakage inductance. And then improve.

The actual device, which involves both theory and engineering, must be combined.

Even though she knew how to do it, there were no ready-made materials, and the ferrite core and enameled copper wire were too different from the components required for music players. Liu Meng also couldn't ask Huang Sheng to purchase these two things, so as not to arouse suspicion.

Liu Meng has grown wise and wise, and his heart is sinister, and he will no longer be in danger for no reason.

The miniature high-voltage pulse power supply device can only be considered here, and the music player must also be turned on. Otherwise, there has been no progress, which will also arouse Huang Sheng's suspicions.

Without hesitation, Liu Meng first installed the mat1ab software in the computer, which is very convenient for debugging digital processing algorithms, and there are many ready-made functions that can be called.

The music player is actually the process of transforming and restoring, the original digital signal of the 4omB space is converted to 2mB, and the compressed 2mB signal must be restored to the level of 4omB in the process of playback. Restore while playing, so that it doesn't take up space and still maintains audio quality.

Fortunately, Huang Sheng had been fully prepared before, and he bought a lot of various micro controllers and memory chips needed for music players, and after having ideas, Liu Meng began to debug the algorithm.

In fact, this algorithm is to screen out useless signals and discard them, leaving the most core signals. According to the sampling principle, in a certain frequency band, only a fixed number of sampling points are needed in a cycle, and the analog signal of this frequency can be restored by the algorithm of digital signal processing.

Importing an audio clip, Liu Meng began to write an algorithm for converting the minimum number of points and recovering fù. After being completely immersed in it, he forgot where he was for a while, this was a technique he had studied in the library before, and he had not had time to implement it, but Huang Sheng gave him a good opportunity this time.

After several hours of repeated debugging, the algorithm is constantly improved, and it can only achieve a compression ratio of about 2o times, which is similar to the current products on the market, but when it is restored, the sound quality is improved a little bit, and it has actually been able to meet the requirements of Huang Sheng only to copy it.

It's just that Liu Meng is not for him, but has been thinking about it for a long time, and he is interested in it, so he wants to open it, with his own excellence in technology and the pursuit of perfection, of course, he will not be satisfied with copying the existing technology.

It's a fundamental breakthrough.

After a variety of attempts, but he was never able to break through, Liu Meng fell into contemplation again, and he realized why most of the existing products on the market were at this level, and there was this limit in them.

Liu Meng didn't admit defeat, at least he knew that Apple's music player was ahead of other products, taking up less space, but the sound quality was far better than other players, was the filtering link better?

After the processing algorithm had no idea, Liu Meng had to switch to the filter to think, and after making a tribulation, the filter is actually the icing on the cake, and the improvement of sound quality is not obvious.

What's the problem?

Liu Meng lost his thoughts for a while, and couldn't help touching his chin and frowning, which was his usual action when he had no ideas.

Huang Sheng stared at Liu Meng in the surveillance screen, seeing that he was indeed doing things seriously, he couldn't help but be secretly proud, hehe, thanks to Lao Tzu's foresight, he left this kid behind, look at this posture, he was really able to drive out.

Thinking of this, Huang Sheng also thought a lot, in addition to the music player, is it not to turn on any mobile phones, cameras and other electronic products, then Lao Tzu has reached it? A few years later, the assets will be hundreds of millions, and he will become the man of the year in Bingcheng? No, the whole of China is a man of the hour.

Thinking of these beautiful things for a while, I became bolder, and I even thought about whether I could lock Liu Meng up for a long time, so that Liu Meng could completely become his boot.

Fat and bald, thin monkey, I bah, I don't even deserve to lift my shoes when the time comes.

Huang Sheng was thinking about it, and Liu Meng, who was in deep thought, jumped up suddenly, and his stuck thinking finally found that glimmer of light and found a way to break through.

ps: I don't know if there are so many professional terms written in this chapter, do you feel dizzy when you read it? If you don't like it very much, then let's write it briefly.