69novels Chapter 228 Preparing to manufacture a closed-circuit surveillance system
Chapter 228 Preparing to manufacture a closed-circuit surveillance system
In 1949, the United States also began to use coaxial cable monitoring systems, placing cameras in important places such as the White House, which became an important means of security.
In the early 60s, closed-circuit television systems began to enter the civilian market and were gradually used in crowded public places such as banks, shopping malls, and campuses.
In the 80s, the invention of VCR recorders made monitoring methods more flexible, allowing not only real-time monitoring, but also recording and playback.
With the popularization of computer networks, monitoring systems have also become digital and intelligent.
Nowadays, CCTV has become an indispensable tool for public security and traffic management, and is used in all walks of life...
As Li Yang read on, his thoughts suddenly became clear.
He suddenly realized that if he wanted to build a monitoring system, the principles and equipment needed were so simple!
The first is the camera, which is the signal acquisition end, and is responsible for converting the optical image of the object being photographed into a continuous electrical signal.
The second is the transmission cable, which generally uses 75-ohm coaxial cable with impedance matching and strong anti-interference ability, just like cameras and surveillance.
The link between the devices firmly sends the image from one end to the other.
The last is the monitor, which is the display end of the signal. It can restore the electrical signal into a visual image so that people can see it at a glance.
In addition, the system also requires some auxiliary equipment, such as lenses, pan/tilts, brackets, etc., to expand the functions of the camera.
Power supply, video distributor, video recorder and the like ensure the stable operation of the entire system.
"These things can be seen everywhere in modern times, but in this era, they are new things!"
Li Yang pondered secretly, with a hint of smile on his face.
He couldn't wait to show off his skills and independently create a monitoring system!
However, while being full of confidence, Li Yang was also clearly aware that all things are difficult at the beginning.
Not to mention sophisticated instruments like cameras, even a decent TV is rare in this era.
If you rashly make requests to the factory, I'm afraid they will be regarded as fantasy.
Thinking of this, Li Yang couldn't help but frown.
He paced back and forth in the office, his hands behind his back, lost in thought.
"No, we need to lay a solid foundation first! Start with the simplest materials and make it step by step!"
Li Yang muttered to himself, and gradually came up with a plan
He walked to the wall, took down a piece of chalk, and quickly wrote a list of materials on the blackboard:
"Cathode ray tube, electron gun, coil, magnetic ring..."
Each term represents the most essential composition of a television.
Although it is not a true camera, as long as the TV is modified, basic imaging functions can still be achieved!
Thinking of this, Li Yang couldn't help but feel proud of his own wisdom.
Even if the technology is backward, it can't stop this "man of the future"!
……
Twenty minutes later, in Secretary Zhang's office
"Xiao Li, what are you trying to do?" Secretary Zhang widened his eyes and looked at the equipment application form handed over by Li Yang suspiciously.
There were a bunch of parts listed on it, such as coaxial cable, distribution amplifier, 75 ohm terminal resistor...
Although Secretary Zhang didn't understand these things, he could sense that something was unusual.
Why would a metallurgist need these electronic devices? Are they tinkering with some new technology?
For a moment, countless question marks popped up in Secretary Zhang's mind, but he was too embarrassed to ask directly.
"Secretary, don't worry about it! I guarantee that these things are for the benefit of the factory and are absolutely worth the money!" Li Yang said with a grin, his eyes rolling around.
Secretary Zhang saw that Li Yang was keeping him in suspense and didn't want to ask any more questions. He could only sigh helplessly and sign his name neatly on the application form.
"Okay, I'll have the materials department deliver these equipment to you later, so you have to take good care of them! Don't cause any more trouble!"
Secretary Zhang said this half as an instruction and half as a joke.
"Don't worry! I promise to impress you this time!" Li Yang patted his chest confidently and left with a beaming face.
Secretary Zhang couldn't help but smile as he watched the young man's back disappear at the door.
"This kid is really getting more and more like the boss. It's worth it that I have cultivated and promoted him! Alas, the successor of the new era must have this kind of enterprising spirit!"
Secretary Zhang murmured to himself, his eyes revealing a bit of relief and expectation.
He felt that this young man named Li Yang would surely shine in the metallurgical industry and even the entire industrial front, and make unprecedented achievements!
Secretary Zhang picked up the phone and called the equipment section chief on the spot:
"Chief Lang, I want to tell you something. Our Deputy Chief Li is going to make a new invention. You have to let him know what he needs and cooperate with him. Don't let him down!"
Secretary Zhang's voice came through the microphone and spread throughout the Equipment Department.
When Section Chief Lang on the other end of the phone heard that it was Li Yang who made the request, he immediately became respectful and responded promptly, saying that he would fully cooperate.
……
Back in the office, he couldn't wait to spread out the drawings and start drawing on them.
I saw him measuring dimensions, marking data, sometimes frowning in thought, sometimes suddenly enlightened.
In just one morning, the design of a "Li's Special" TV set has taken shape!
"Haha, it's me indeed!" Li Yang held up the blueprint and looked at his masterpiece proudly.
Even though it is not as good as a real camera, it is made of easily available materials and has a simple principle. With just a little modification, you can monitor every move in the yard!
……
At the same time, the Jia family in the hospital were in a state of panic.
Jia Zhang had gauze wrapped around her head, her head drooped, and she sat beside the bed in a daze.
The incident last night was like a nightmare that could not be shaken off her mind.
"Damn Li Yang! You've made my beautiful face look like a barbecue grill!" Jia Zhang gritted her teeth, wishing she could chop Li Yang into meat sauce.
She looked around and muttered, "This lousy hospital is missing everything, not even a mirror! What on earth has become of me now?"
After saying that, he reached out to touch the bedside table.
"Mom, calm down and don't be impulsive." Qin Huairu stood up quickly, took out a small mirror from her bag and handed it over carefully.
Jia Zhang snatched the mirror and held it tremblingly in front of her, but she was frightened to death by the scene in the mirror!
All I saw was a burnt face, with skin and flesh turned outward and eyebrows burned off. It was even scarier than the zombies in the movies!
"Ah!" Jia Zhang screamed, her hand loosened, and the mirror fell to the ground with a snap and broke into pieces.
"It's over, it's over. My life is ruined!" Jia Zhang cried loudly, her tears mixed with pus and blood, soaking the gauze.
"Mom, don't cry. If you keep crying the doctor will scold you," Qin Huairu comforted helplessly while picking up the broken pieces of the mirror.
She also felt mixed emotions.
……
If possible, please give me some love and send me free love electricity. You can send it by clicking on the reminder. If you get more than 500 love electricity gifts a day, I will update more. I am a full-time writer. Please, muah~