Zhongguancun. Pen @ fun @ pavilion wWw. ｂｉｑUｇE。 ｉｎｆｏ

Yuan Bao tossed and turned for a long time before he found a pager with voicemail, which is quite expensive. Don't be in a hurry to buy it first, call Huang Xingtao, a master of Tsinghua University, on the spot, and ask if you can transform the pager into a walkie-talkie and send voice.

Huang Xingtao didn't know much about it, but he was very enthusiastic, and found an engineer Wang Dongyi, who was engaged in this "high-tech" in this area, who was doing research and development work in a pager company, and immediately replied "no problem".

At present, the pager industry is the pinnacle of the information industry, and Tsinghua University's experts have also gone to such enterprises for high research and development.

Yuan Bao hurriedly applied for the fee from his mother, and asked the master to come out for dinner, saying that he was asking the master for college entrance examination experience, and when his mother heard this, she immediately agreed.

You can't mention this sensitive topic in the opening line, the other party will definitely wonder why you want this thing? So, let's talk a little bit about it and ask, "What is the principle of a pager?" ”

Master: "Actually, it's similar to radio, the first pager was invented by Motorola, it's as big as a radio, the paging center broadcasts to all the machines together, pay attention to your name when you read it, otherwise you will miss it." Now it's much more advanced, and you can send a message to a specific machine.

So, the kind of voice pager you are talking about is actually the earliest form. A 50-meter-high base station can manage information transmission within a range of 15 kilometers, and energy is required to penetrate the wall, and 100W transmission power can travel through 5 kilometers, which is enough for an urban area. ”

Yuan Bao: "Doesn't that mean it's easy to build?" Can private capital enter? ”

Gaoren: "That's definitely not good, the country can't give the wireless communication frequency band to the private sector, now the main use is 160MHz, and there are 450 and 900. Private companies build pagers at most. ”

Yuan Bao: "Can anyone solve this problem?" ”

The master was stunned: "What's the problem?" ”

Yuan Bao: "The problem of mutual interference at the same frequency." ”

Superior: "Oh, you mean it's used for military anti-interference, right?" That requires constant frequency hopping, high-speed frequency switching, and it is difficult for the other party to interfere. ”

Yuan Bao: "No, no, I mean, the same frequency band can also be anti-interference. ”

The master scoffed: "How is this possible? If this is the case, the same frequency band can be used by several people at the same time, and whoever invented this is a living immortal. ”

Yuan Bao looked at the master and Huang Xingtao: "Have you ever heard of the photon computer?" ”

Master: "Well, Bell Labs has done it, and it's still in the experimental stage. ”

Yuan Bao: "Yes, electronic computers are limited by Pauli incompatibility, but photons can be superimposed, and the superimposed photons retain the original information, but they need to be calculated to extract. For example, the beginning of each packet is 000 and 111 respectively, and it becomes 001 after the superposition, then the party sending 000 knows that the packet must subtract 1 from all the data before it can be used, and the party sending 111 knows that its packet needs to add 11.

I'm talking nonsense, that's what it means anyway, the so-called parallel computing. I don't understand the technical details, do you think it's possible? ”

Huang Xingtao and Wang Dongyi's eyes lit up, and Huang Xingtao smiled: "I know that Xiaobao has a lot of ghost ideas, eh, if this kind of communication technology that can be superimposed is really developed, even if it can only be superimposed once, it will also double the communication capacity, I think you can try." ”

Wang Dongyi really got interested, and muttered: "It makes sense, it makes sense, if you develop this system, you can start your own pager." ”

Huang Xingtao: "No, you can be undisturbed yourself, but if you interfere with others, you have to use the upgraded system on both sides." ”

Wang Dongyi: "Then discuss it with the other party, we will pay for the most equipment upgrades, and there will be an extra communication frequency band. ”

Yuan Bao: "I don't know how long it will take you to develop this magic algorithm, but there is a shortcut that can also achieve a similar effect, do you want to hear it?" ”

Huang Xingtao: "Do you want to hear it?" I don't think this algorithm can be figured out in a few years, but it's still a shortcut and a good deal. ”

Yuan Bao: "It's to cooperate with cable TV, and now they haven't reacted, and they don't know that their TV channels can actually be used for communication, so let's go and tell their boss, you rent a frequency to us, and we will use it to build a paging station, and the price is negotiable."

As far as the urine of state-owned enterprises is concerned, they will definitely not think of using TV channels for communication before you develop anti-jamming algorithms. By then, our first pot of gold will have been earned. How to use the frequency bands vacated by the algorithm is already at ease. ”

Huang Xingtao looked at Wang Dongyi: "Is it feasible?" How to say cable TV? Not satellite TV? ”

Wang Dongyi: "It's all the same, cable TV must also be sent through satellite and then transmitted to door to door, their communication capacity is really large, video can be transmitted, the paging station is a waste, you can call directly." ”

Huang Xingtao: "It's hard for this thing to be directly built into a TCP/IP Internet, it's bigger!" ”

As a person who came over, Yuan Bao was afraid that they would make it bigger, so he hurriedly persuaded: "Don't, don't make it big, the state will control it, first engage in pager services and see what the limelight is on." ”

Huang Xingtao laughed: "Xiaobao is young, and he is older than us. ”

After some nonsense, Yuan Bao finally got to the point, and said about his need to modify the pager, for the sake of the face that he provided such a good golden idea, Wang Dongyi promised to give him technical support, go back and calculate the components used and give him a quote, both sides left the phone and pager, they both have pagers, Yuan Bao has not yet.

Wang Dongyi knew that the other party was going to take the college entrance examination, and he knew what was going on, but he didn't say anything.

For Yuan Bao, it is the first step, and how to take out the papers for the gunman as soon as possible after the exam is still a huge problem.

Thinking about it, I'm afraid that it may be feasible to let friends outside the field use binoculars to help peek at the master's papers.

You can take a peek at those super key middle schools, such as the examination room of the fourth middle school, and it is estimated that if you catch any of them, you can throw Yuan Bao's papers out of 8 alleys.

For this reason, he went to find an old classmate, who had not been in touch for a long time, but used to be very good friends, because the other party went to the secondary school to study animal husbandry, and he was in high school, so he gradually lost contact. At the critical moment, I still remembered "hair small".

After a small talk in the teahouse, he asked Fa Xiao: "Is it easy to find a job?" ”

Fa Xiao: "It's okay, but a good unit always has a bachelor's degree, and I regret it." ”

Yuan Bao: "Why don't you get a diploma from a correspondence university, it is said that it is the same as a serious graduation." ”

Fa Xiao: "Forget it, I've been playing for three years, and my exam skills are all gone, and I was still the first in my class that year." ”

Yuan Bao just took a fancy to this first place, otherwise he would really be stunned, and cheating would be unreliable, so he said: "If you are given a cheating artifact, would you like to take the test?" ”

Fa Xiao: "Then it depends on what kind of artifact, foolproof?" He had already discovered that there was something in the other party's words. ”

Yuan Bao put together the magic weapon he was studying.

It's the first time I've heard of bone conduction: "Reliable? ”

Yuan Bao: "Well, I tried, tied to the place with many bones on the body, only I can hear clearly, others don't know, and I have the skill of dodging the walkie-talkie to be heard, cutting the message into two sends, and only half of the sound can be heard at a time, even if ordinary people hear it, it is inexplicable." My device automatically synthesizes the full sound, so it's perfect for hiding from the eyes of surveillance. ”

Fa Xiao: "What the hell am I?" Really? Are you a scientist? Learned this in three years? With this cleverness, can't you get into a good university? ”

Yuan Bao: "Alas, it's too late, do you think I want to, you help me once, and I will help you next time if you need it." When the time comes, I will record the position of the master in the same examination room, and you can see through the telescope if you can ...... Alas, speaking of this, it's really a bit hanging, what if you can't see it? ”

He frowned in annoyance.

Fa Xiao: "Yes, even if there is this magic weapon, it seems that it is still unsatisfactory, not simple, we are still unprofessional." ”

No matter how much it is, anyway, the "partner" has been found, and when the examination room is announced, I can only resign myself to fate.

They also discussed a way to rely on "big data" to get the right answer, looking at a few more people to see which one has the most the same answer, which may be right.

With this method, it may be possible to pull out a general from a pile of waste wood.

After arranging these moths, well, Yuan Bao can review with peace of mind, just look at the questions that are difficult to do by peeking, multiple-choice questions, true/false questions, fill-in-the-blank questions and so on are all handed over to his teammates.

He will do his own problems first, and then when everyone is almost done with those questions that can be peeked, the partner will summarize and get it at one time, which is the most dangerous at this time, in case a teacher comes over and sees you doing multiple choice questions ferociously, don't look at it, then ...... He will become a suspect.

Cheating, there are always flaws, and it is very difficult, only in the distance can there be poetry.