readx;

Lin Hong continued to process the audio, and finally only the sound of the first few dials remained, and then he amplified the sound of these dials and displayed them in the audio analysis software. Pen & Fun & Pavilion www.biquge.info....

Watching Lin Hong continue to process these dial-up audios, Xu Wenjing and Wang Yuqing also understood a little.

Xu Wenjing asked, "Stone, do you want to restore the number dialed by the other party through these dial tones?" ”

Lin Hong nodded: "Well, the dial tone is relatively clear, it should be fine." ”

Wang Yuqing was a little surprised: "You can know what number to dial just by your voice?" ”

To her ears, when the phone is dialed, although there are some different sounds, it doesn't seem to be regular, right?

Lin Hong glanced at her and saw that her mood had completely recovered her mind at the moment, so he explained:

"There is a pattern to the telephone dial tone, which is a technique called two-tone multi-frequency, which was invented by Bell Laboratories back then. The reason why it is called two-tone multi-frequency is because there are a total of eight frequencies, divided into two groups, and then let them be combined in pairs, so that there are a total of 16 combinations that can represent 16 different signals. They represent ten numbers from 0 to 9, as well as these special characters and letters on the keyboard. ”

As he spoke, Lin Hong also took the phone from the laboratory.

"Although our ears sound similar, there are actually differences, and the differences between them can be analyzed by technical means."

The audio software downloaded by Lin Hong is not specifically used for telephone dialing analysis, and he can't directly see what the audio of these dials is, but he can identify these numbers by comparison.

As for the knowledge of telephone, it was Kevin "Mitnick who taught Lin Hong, and later after special practice, he could hear the number dialed by the other party just by ear.

In fact, many people, especially those who are blind, have a very sensitive sense of hearing and can distinguish very subtle differences.

In order to avoid trouble, Lin Hong did not plan to answer the two of them and say that he could hear the numbers directly, but confirmed the numbers through audio map comparison.

He pressed his phone to record and convert the dialing sound into an audio file, and then used audio analysis software to determine the corresponding maps of the ten digits, and then used these maps to compare them with the audio dialing map he had obtained earlier. *.**/*

Lin Hong's operation was very fast, and he didn't explain anything to Xu Wenjing and Wang Yuqing later, which also involved some technical processing.

Xu Wenjing and Wang Yuqing stood behind him, only to feel that the data on the monitor was swiping one after another, and they couldn't understand it at all.

The two of them looked at each other and were shocked by Lin Hong's skills.

"These techniques are not ・・・・・・ that an ordinary student can master"

Wang Yuqing couldn't help but have a great interest in Lin Hong.

In fact, she had noticed before that Lin Hong's name had been changed to Lin Jiang for some reason. At the beginning, she investigated Lin Jiang's information and found that there was no record that the other party had ever called Lin Hong, and her experience when she was a child did not show any flaws.

At that time, he felt strange, and felt that there must be some kind of unspeakable secret in it, if it weren't for the fact that Lin Hong was a good friend of her good sister Xu Wenjing, she would definitely continue to investigate.

And now, she finds that there seems to be a lot of mystery in this boy. The more I got in touch with him, the more I realized that there were many unexplained things about him, and he didn't look like a freshman who had just entered college.

"There must be some kind of secret on him・・・・・・ no, I have to find out, Jing Jing doesn't seem to know anything about it, and he is still in the dark......"

As Xu Wenjing's good sister, she naturally knew that Xu Wenjing had developed feelings for Lin Hong, and she chose to believe every word this man said without reservation. Wang Yuqing felt that it was necessary for her to conduct a thorough investigation of Lin Hong.

Just as she was thinking like this, Lin Hong had already restored a lot of the phone number of that restaurant.

Lin Hong took out a piece of paper, wrote down the number, and said, "It's basically almost, six of them can be 100% certain, and I analyzed the other two, and there are three possibilities respectively." ”

At this point, the number of the restaurant can basically be determined, Lin Hong does not plan to deal with it technically, and it is more efficient to use stupid methods at this time.

"That way, there are only nine combinations in total, and we just have to hit each of the nine numbers to determine which restaurant is the other party."

Hearing Lin Hong say this, Xu Wenjing and Wang Yuqing also knew that the next thing would be simple.

Wang Yuqing said: "Without further ado, hurry up and call to determine the final number." After getting the number, I asked my colleague to call up the latest call record of that number, and combined with the time when Uncle Dong was kidnapped, I eliminated them one by one, and I could determine the location of the other party. ”

Lin Hong didn't say anything, just picked up the phone and began to dial according to these nine numbers, and the first thing he said after dialing was: "Hello, I want to order food." ”

Of these nine numbers, seven are connected, two are non-existent, and of these seven, only one number is the restaurant's service number.

In this way, at this time, the number is finalized.

After Wang Yuqing got the number, she was about to call the bureau, but was stopped by Lin Hong: "How do you plan to report this to the bureau?" My advice is not to make this public for the time being, because we cannot rule out whether the kidnappers have eyeliner in the police station. ”

Wang Yuqing was no longer as reckless as before at this time, she thought for a while, and said: "If you want to send the police to the bureau, it will definitely not work if you don't officially file a case." Unless・・・・・・"

Speaking of this, she turned her head to look at Xu Wenjing and continued: "Jingjing, if you can come forward, I think this matter can be better resolved." ”

Xu Wenjing was slightly stunned, and then understood what Wang Yuqing meant.

Xu Wenjing is not just a reporter for a TV station, but more importantly, her illustrious family background, if she can come forward, this matter will be much easier.

Under the rapid change of mind, Xu Wenjing also made a decision: "Okay, then I will call your director directly, as long as this matter works well, it is also a win-win thing." ”

Then there was nothing to do with Lin Hong, Xu Wenjing and Wang Yuqing worked together and began to plan this matter.

This matter is more urgent, Xu Wenjing and Wang Yuqing drove away, while Lin Hong stayed directly in his laboratory, the matter has come to this point, he doesn't have to get involved anymore, and the matter of rescuing the hostages will be handed over to the police.

Lin Hong sat down in front of the computer and began to continue writing the linx kernel.

Now that the linu01 version of the kernel has come out, he is writing some system services and file systems on the outer layer, as long as the basic components are completed, the system can basically be installed on a simple machine for testing.

After compiling for a while, Lin Hong's mind couldn't settle down, and he was always thinking about what had just happened.

"When did it become so gossipy?" Lin Hong laughed at himself, then exited the code editor, called up the bit messenger proxy service, and began to hack into the China Telecom database server.

The details and phone numbers of almost all users in China Telecom are owned by Lin Hong when he investigated the details of others before, so this time he is also familiar with the way.

He quickly found the call logs and location of that restaurant.

"Huh?"

Lin Hong found that this restaurant called "Bashu People's Family" was actually in this block, and it was only a more than ten minutes' walk from the courtyard.

"Around here?"

The reason why Lin Hong was a little surprised was that under normal circumstances, people who order food will subconsciously follow the principle of proximity, after all, if it is too far, the restaurant may not deliver food.

From the other party's act of calling to order food, it can also be concluded that the other party is not an experienced kidnapper.

In this way, it is very likely that the place where the kidnappers are hiding is nearby.

Lin Hong directly called up the recent call records of this restaurant, downloaded them to the local area, and then wrote a regular expression to filter out the results that were not within the time range, and then filtered out the mobile phone number, and finally determined 14 call records.

Maybe because it's a restaurant's service phone, when it's time for a meal, there are more people calling, and if it's an ordinary phone, there are not so many records at all.

Lin Hong thought about it for a while, and finally set another filter condition - talk time.

The call between the other party and the restaurant is not long, it should be within ten seconds, and with this filter, the fourteen call logs are reduced to five at once.

Lin Hong then used these five phone numbers to search the telecommunications database to check the nature of the place where the telephones were installed, and finally he determined the ultimate target -- a private house in the next door called "Cheqian Alley".

This small alley is relatively old, and the houses inside are also very dilapidated, I heard that they have been shouting for demolition, but because it involves the protection of cultural relics and buildings, this project has not been carried out.

The reason why Lin Hong knows so much is that when he came back by car last time, the van driver told him about it, and the other party was one of the landlords inside. Due to the dilapidated houses in Cheqian Alley, there are few locals who live in them, and they are all rented to others, and most of them are short-term rentals.

Cheqian Alley is next door, less than 50 meters away from the courtyard house rented by Lin Hong, and it is basically over the wall of the courtyard house.

Lin Hong didn't expect that after a long time, these robbers and himself would become neighbors.

Do you want to check it out?