Chapter 638: Make a small record
Yi Zhonghai can do it, but we can’t?
So all the veteran mechanics in the No. 3 Factory are extremely interested in these novel gadgets, and they can’t wait to put all their strength into them.
The comrades at the Beijing Watch Factory were a little confused. Is this really a computer? And it doesn’t sound like you want money, but you really need the technology of Beijing Watch Factory?
In fact, they don’t know that the comrades of the 11th Machinery Department are very happy about this matter. They can finally participate in this matter and contribute to this cutting-edge high-tech.
There is only one number between eleven and twelve, but in this regard, the Twelve Machinery Department is making great progress. The Eleventh Machinery Department can only temporarily do traditional work and existing equipment. In terms of high technology, there is no Twelve Machinery Department for the time being. The fields of computer and electronics are outstanding.
It’s not that the Eleventh Machinery Department doesn’t have high technology, but it just doesn’t have any big results for the time being, and it’s not as good as the 12th Machinery Department.
Now that I heard about this opportunity, I happily sneaked out of the Beijing Watch Factory.
So now they are just listening and not expressing their opinions.
Chief Engineer Chi of the computing office is different. For this kind of thing, the computing office bears the brunt and does his part.
"Professor Gao, what kind of peripheral is it?"
Gao Zhendong did not say directly, but asked a question: "Chief Engineer Chi, which of the current DJS series computer peripherals do you think you are most dissatisfied with?" One? "
This question can only be asked to Chief Engineer Chi. The other two groups of people have no answer to this question, and they don't even know what peripherals are available.
This question made Mr. Chi think about it. It’s hard to say the answer to this question. Every peripheral device has its dissatisfaction, but to say the most dissatisfied, you have to think about it.
After thinking for a while, Chief Engineer Chi said decisively: "Tape storage!"
Gao Zhendong smiled, and he was indeed an expert in this field: "Tell me the reason."
"The speed is slow, but this is not the most uncomfortable thing. The most uncomfortable thing is the storage order, not random storage, so when modifying When there are no files in the current tape segment, it will be very uncomfortable and the speed will be very slow. Before your operating system, it was easy to make mistakes in programming and control."
Gao Zhendong nodded: "By the way, I just want to solve this problem."
Chief Engineer Chi thought for a while. : "High-speed tape?"
Since the speed is slow, speed up! At the same time, the higher the speed, the faster the time to access random data.
Gao Zhendong shook his head: "The fundamental problem cannot be solved, and high-speed tapes have very high requirements on tape materials."
The method of controlling the tape speed of the music tape machine is actually synchronized with the two take-up pulleys that everyone thinks Co-rotation is different. When the tape is wound in a certain direction, only the tape reel in that direction is rotating, and the other tape reel is driven. The faster you pull, the faster I turn.
But it is not the take-up pulley that controls the uniform speed of the tape, because the circumference of the tape changes with the amount of tape being wound. The length of the tape pulled during one revolution is different. I want to adjust the speed in real time. To realize the constant speed of the tape, it is too complicated for the tape drive and the cost is horribly high.
What actually controls the speed of the tape is a set of pressure pulleys next to the magnetic head. The rotation speed of this thing is fixed. How much tape the take-up pulley can pull away depends on its rotation speed. Only when When fast forwarding, the pressure pulley will be released, and the take-up pulley will rotate at full speed to achieve fast forwarding.
Mechanics are very interesting things, and this little set of tape feed controls has a lot of whimsical ideas.
In this case, the tape is directly under tension, and the tension is in two places: a section from the driven pulley to the pressure pulley, and another section from the pressure pulley to the take-up pulley.
Low speed is fine, but high speed is unbearable. It will break, and there are two places where it may break! Especially the driven pulley to the pressure pulley.
Chief Engineer Chi really didn't pay attention to the mechanism of the tape drive. After listening to Gao Zhendong's explanation, he understood that high-speed tapes would not work with this structure.
For this, Chief Engineer Long of the Jingcheng Watch Factory is familiar with this: "Professor Gao, how about master-slave synchronous rotation?"
The comrades of the Jingcheng Watch Factory have their own ideas for small precision transmissions. The advantage is quick response.
This was the reason why Gao Zhendong chose them instead of Haihekou Record Player Factory. Although the record player is the same as the floppy disk, it rotates, but the record player does not have the ability to control the position of the stylus, and the storage medium is not a magnetic medium.
When Gao Zhendong and Lou Xiao'e first met, he knew that she liked music. In addition to the reason for the TV series, this was also the reason - Lou Xiao'e could accurately place the stylus directly on the second record of "From the New World" The beginning of the movement~!
If I have to say, the division of labor with them, the Cultural Audio and Video Corporation, which is responsible for producing tapes, is better than them. After all, they still use magnetic media.
Gao Zhendong shook his head: "It's technically a bit troublesome, and it can't fundamentally solve the problem of random reading and writing."
Chief Engineer Chi thought for a while: "How to do it?"< br>
Gao Zhendong said: "Since tape is a two-dimensional storage formed by rolling up a one-dimensional storage method, which means it must be unfolded to read, then why don't we directly use the unfolded two-dimensional surface to store data? For example, A close relative of tape.”
When possible, he is still used to guide everyone to think about problems. Everyone was lost in thought: "Two-dimensional surface, a close relative of tape..."
After thinking for a while, Mr. Long from the Beijing Watch Factory was the first to react: "Professor Gao, Are you talking about records? "
He also followed Mr. Chi and called Gao Zhendong professor.
Records are also rotated, watches are also rotated, and they are also close relatives. He can think of the records and there is nothing wrong with them.
As soon as these words came out, everyone suddenly realized.
Yes! Isn't this thing a typical example of storing data on a two-dimensional surface?
Replace the top with magnetic media, change the stylus into a magnetic head, and add a magnetic head servo mechanism to actively control the movement of the magnetic head, that's it!
Chief Engineer Chi gave a thumbs up: "Professor Gao's idea is very simple, but I really don't have the ability to draw parallels. This thing can be done!"
After saying that, he also had some doubts: "But in this case, wouldn't the advantage of the tape's portability be lost?"
Let alone comparing a 12-inch LP with a 10-inch EP, even if it is compared with a 12-inch LP Compared with a 7-inch single record, which is bigger than a fish plate, tapes can be considered small and exquisite. Not to mention the huge recording equipment, even the size of the storage medium itself is also different.
By the way, by the way, small albums of a few songs released by later generations of artists are called EPs, which comes from EP records. There are more than one song, but it can't be too much.
Chief Engineer Chi felt shuddered when he thought about how he would pull out a big Frisbee before saying a few words when he went to other places to do business in the future.
I can tolerate it if I have never used it, but if I have used it, I can’t go back.
His question is not completely unreasonable. In fact, the earliest floppy disk was an 8-inch one. This product appeared in 1971 and was later replaced by 5.25 disks.
Gao Zhendong nodded: "Yes, so we don't do big ones, we do small ones!"
When the comrades of the No. 3 Factory heard this, they became very energetic. No wonder Chief Engineer Gao called us all over.
If you want to make it small, you must have precise control of the magnetic head. When it comes to precise control of moving parts, who among the CEO's staff can match us?
The comrades of the Jingcheng Watch Factory are also confident.
Originally, they were afraid of the unfamiliar business of electronics and computers. They really didn’t understand this thing!
Now I understand that what Professor Gao wants here is his factory’s technical skills in small and micro transmission mechanisms. He is not just bragging. There is one in Sijiu City. It's impossible, absolutely impossible, to think of someone higher than him.
As for the Haihe Watch Factory, it’s a first-come-first-served basis, hehe.
I can’t do electronics, but you can’t do small transmission mechanisms, so it’s just right.
Chief Engineer Chi looked at the people gathered by Gao Zhendong and realized that if these people cooperated and started a big one, it would be a slap in Gao Zhendong’s face. He has never been in the habit of doing things halfway. .
"Okay, Chief Engineer Gao, what do you think needs to be done? How will it be made?"
Gao Zhendong drew a picture on the blackboard. Gao Zhendong's traditional art skills belong to it.
“My idea is to make a disk with a diameter of 15cm and put a plastic envelope on the outside. The envelope has an opening for reading data, and the magnetic head moves on this opening.”
Since we are the first to do it, forget about talking about inches and inches. We are broad-minded and use the International System of Units and its derivative units, which everyone can understand at a glance.
I will not do this foolish behavior like that of Citigroup, not to mention the weird units, the same unit is divided into several types on different occasions, such as ounces are divided into constant weight ounces and medicine (gold) weight ounces, and other examples The tonnage is divided into long tons and short tons, which makes them a big trap. In fact, fundamentally, they are a knowledge monopoly behavior of the elite class.
A comrade from the computing center asked: "General Engineer Gao, why don't you directly control the magnetic head to access different areas of the disk? Wouldn't this save a set of rotating mechanisms?"
Gao Zhendong hasn't spoken yet, Jingcheng Watch Chief Engineer Long of the factory laughed first: "Comrade, in that case, the disk rotation mechanism can be saved, but the head movement mechanism will be difficult. Mr. Gao is dividing the motion trajectory control on the two-dimensional plane into Two one-dimensional motion controls, one rotation and one radial motion, are much simpler when combined with enough margin."
Storage devices have been developed for decades, from floppy disks to hard disks to optical disks. , the motion control of reading and writing mechanisms all follows this set of principles, which is not unreasonable.
The exception is magnetic tape, which does not require rotation or radial movement, and cannot even read data. However, its radial movement may be replaced by parallel reading by a row of magnetic heads.
Gao Zhendong was happy. It was good to have someone to replace him. He didn’t need to explain himself. He smiled and nodded: "Mr. Long is right. In this way, the motion control of the magnetic head will be much simpler, and This cover can protect the disk surface very well. The disk is much more delicate than the record. ”
(End of this chapter)