Chapter 607: Desert's Request

Real-time encryption of the voice data stream generated in real time is simply not something that a computer of the specifications of the DJS-60D can handle.

But today, Gao Zhendong's hardware multiplier gave them a hint: could they make a dedicated encryption hardware, string it in the voice circuit, and use the advantages of high-speed hardware to encrypt the voice data stream?

"Well, that's fine. Just sort out your encryption requirements and come to me when the time comes. By the way, if it's convenient, you can also tell me about voice digitization. Maybe I can help you."

The comrade in communications was stunned for a moment. Do you understand this too?
The chief engineer of the Defense Work Committee was overjoyed. How could he have forgotten about this? This guy is leading the comrades from the Communications Institute of the Postal and Communications Commission to develop a programmable switching system. I heard that the progress is very good and he must be very knowledgeable in this area.

"That's great!" He said with a smile, and turned to the comrades in charge of communications and said, "Go back and sort out the requirements for voice digitization and voice encryption, and then go back to find Comrade Gao Zhendong."

Seeing what the commission's chief engineer said, they knew that Chief Engineer Gao must be quite capable in this area, and they happily agreed.

To be honest, the single-cycle hardware multiplier only allowed them to see the dawn of digitalization, but they still had no idea how to do it specifically. It would be great to have technical guidance.

For Gao Zhendong, this was actually the professional content of his previous life - PCM processing technology for voice calls. As a university with a communications background, the automation major also has to learn this.

PCM is a set of time-division multiplexing technologies for digital program-controlled switches, which naturally includes voice coding technology.

Thinking of this, Gao Zhendong suddenly realized whether he should pull up the programmable switching system as well.

Originally, I didn't expect that the comrades working on the lithography machine would be so powerful and could achieve the process of 10 microns in one go, so I temporarily put aside the idea of ​​digital switches and developed air separation switches.

I didn't expect that the plan would turn out to be worse than expected. Now it seems that the basic conditions are in place, at least the conditions for time exchange are in place.

However, the research on space division switching is not in vain, as time division and digital switches will use space division switching.

Well, we can think about this matter carefully. When the time comes, we can bring together the comrades from the Communications Institute and those who are responsible for communications for the troops and talk to them about PCM.
-
Deep in the desert, several comrades were working furiously at their desks in front of computers.

Computers are much faster than humans, but they are still a bit slow for the amount of calculation they can do. They do other work while waiting.

The calculation time for these tasks is measured in hours or even days. If you just wait foolishly, it would be a waste of time.

"I wish I could finish it in one go. Isn't that a bit greedy? Hahaha." A comrade raised his head and twisted his wrist.

No matter when, one of the main tools for research is still the pen. Many comrades doing scientific research do not have very healthy wrists.

"Haha, you are indeed a bit greedy. Even when I was working at Citibank, I didn't expect to have such conditions to work." Another comrade raised his head and smiled.

"But the amount of calculation we have is still a bit large. After calculating the small ones, we still have to calculate the big ones. After calculating the ones on the ground, we still have to calculate the ones flying in the sky."

For complex calculations, although the 8-bit DJS-59 and 60D can achieve 30 binary bits of data calculation through clever programming, their speed is definitely not very high.

Especially when there are a lot of floating-point calculations, the time consumed increases dramatically.

So while scientists are grateful for the good working conditions now, they can't help but hope that things can go faster.

If we can get it done one day earlier and devote our energy to other equally urgent work one day earlier, wouldn’t we be able to bring greater changes to society?

What they don’t know is that their work has actually been completed much ahead of schedule compared to the original time.

"Yes, but unfortunately these calculations have a sequence. If the result of the previous one is not available, the next one cannot be calculated. We may not even know how to calculate it. In this case, even if we have more computers, it will be useless. There are only a few routes that can be carried out at the same time."

Computers are just auxiliary tools. When routes are limited, the overall scale of computing power of the heap is of little significance.

Several people were working when a scientist rushed in with a piece of paper.

"Old X, take a look and see if this thing is useful to you!"

He was holding a piece of printed paper in his hand. Judging from the format, it was a scientific and technological intelligence bulletin issued by the National Defense Work Committee.

Knowing that his comrade would never speak without a purpose, one of the scientists stood up and took the paper from the other.

"Hahahaha, I feel sleepy and here comes the pillow! Look, come, look." Looking at the contents on the paper, he laughed.

Several other comrades leaned over curiously and looked at the notice.

Then they all laughed.

"Haha, really! The comrades out there are really working hard."

"This speed is incredible!"

"That's 25 16-bit multiplications per second! Even if we want to calculate 32-bit, cut it in half, that's at least 12 times!"

This statement is actually not quite correct. For a single-cycle hardware multiplier, the conversion from 16 bits to 32 bits is not so simple. In other words, it is difficult to expand a 16-bit single-cycle multiplier into a 32-bit multiplier.

But they are not in this line of work and don't know about this situation. They only know that they have new weapons in their hands.

"It's a pity that the numbers we need to calculate are relatively large and require high precision, so this 16-bit multiplier is still a little lacking." The computer that originally hit the squirrel was a 31-bit computer.

"It's almost there, so what? I'm not greedy. It's better than nothing. I can always solve this half-point problem with mathematical methods, haha."

Mathematics is the one at the top of the contempt chain of science and engineering, or the most transcendent one.

"Old X, now that we have this technology, can we report it to the National Defense Committee and ask the comrades who are working on this to make us a 32-bit hardware multiplier?" A scientist suddenly had an idea and made a suggestion.

"Isn't this too bad? It affects the work of other comrades too much?"

"Give it a try. There's nothing wrong with giving it a try."

The Defense Work Committee soon received a request from Da Mo, asking about the possibility of a 32-bit hardware multiplier.

Looking at this request, the Defense Work Committee felt both happy and worried.

The good news is that it seems this thing is very useful there.

What I am worried about is whether Gao Zhendong can handle this thing. I am not worried about whether he can make it, but whether he can handle it.

But no matter what, we must try our best to meet their requirements. This is not just a matter of "showing off".

When Gao Zhendong received a call from his leader in the confidential room of the Third Factory, he learned of this request.

"Create a 32-bit single-cycle hardware multiplier as quickly as possible."

The leader's words were very direct, leaving no room for negotiation. He was not afraid that Gao Zhendong would not be able to do it. He believed that Gao Zhendong would be able to do it.

Gao Zhendong was also unequivocal: "We will resolutely complete the task and the results will be known within 20 days."

For floating-point numbers, the calculation is actually divided into three parts.

The sign bit is XORed and the exponents are added, both of which are simple.

The remaining trouble is the multiplication of the exponent part, which is the most troublesome. In addition to multiplication, we also need to consider rounding and other issues.

Fortunately, the principles of the algorithms are roughly the same. From 16 bits to 32 bits, the main increase is in scale. Some logical operation structures can expand the number of operating bits through series and parallel connections, which saves him a lot of trouble.

After hearing Gao Zhendong's answer, the leader put down the phone with relief. Well, Gao Zhendong said 20 days, so it must be 20 days. It will only be advanced, not postponed.

Gao Zhendong did not carry out the work of ICization of the hardware multiplier that he had originally prepared, and directly focused his work on the 32-bit hardware multiplier.

He could vaguely guess where this request came from.

Even if it didn't come from there, the urgent attitude of the Defense Work Committee showed that this matter was very important and worth our attention.

Gao Zhendong not only wanted to make it 32-bit, he also planned to increase the frequency as much as possible. As for speed, no matter how fast it is, it will never be enough.
-
While Gao Zhendong was busy working on the 32-bit multiplier, the Missile Research Institute had already completed the personnel organization for the portable air defense missiles, and several comrades came directly here.

They are all acquaintances, some of them are even very familiar.

Gao Zhendong was a little confused when he saw the person in charge of the guidance system, Lin Lianwei.

Seeing Gao Zhendong's expression, Lin Lianwei laughed out loud: "Old Gao, you didn't expect it to be me, did you?"

In fact, it is not surprising. As a graduate of automation and the person most familiar to the Institute of Guidance and Research and Gao Zhendong, Lin Lianwei learns things the fastest and most conveniently. Moreover, he participated in the design of the two generations of Lei Dian -1 and Lei Dian -3 guidance heads throughout the process and made great efforts, and he is very experienced.

Therefore, it is most appropriate for him to be responsible for the guidance system of this small missile.

Gao Zhendong smiled and said, "I didn't expect that. I thought you were going to be the leader of Thunderbolt-3."

Lin Lianwei shook his head: "With your help, the work was done very quickly and it's almost finished. Mr. Lu felt that it was a waste for me to stay there, so he recommended me to the hospital and gave me more work."

Gao Zhendong smiled: "Well, this is good. The most important thing about this thing is the guidance head."

After everyone had exchanged pleasantries, the chief designer of the model selected by the Institute of Guidance and Research said with a smile: "Boss Gao, we have also made a preliminary plan. Would you like to take a look at it first?"

Gao Zhendong nodded: "Okay, let's communicate."

When it comes to infrared air-to-air missiles, the Institute of Missile Research, which has rich experience, showed typical path dependence.

The solution is basically a smaller version of the Thunderbolt-3, with the same features as the built-in refrigerated infrared orthogonal quaternary detector, continuous rod warhead, gas rudder...

Gao Zhendong laughed when he saw this.

(End of this chapter)