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A red BMW roared in front of the courtyard house that Lin Hong rented. Pen "Fun" Pavilion www.biquge.info

The back door opened, and a figure quickly rushed out, ran to a corner, held down his chest, "vomit-", and vomited.

Then, Lin Hong and Xu Wenjing also got out of the car separately.

Xu Wenjing hurriedly ran to Wang Yuqing, who was vomiting, stroked the other party's back, and asked with concern, "Yuqing, are you okay?" ”

After speaking, she turned her head and glanced at Lin Hong with disgust: "What are you doing so fast?" ”

Lin Hong looked innocent: "I don't blame me, I have already reminded her before to let her fasten her seat belt." ”

Wang Yuqing had just eased up, and when she heard Lin Hong's words, she was suddenly depressed again, and just wanted to say something, she suddenly felt a wave rushing up her throat, and suddenly had to bend down again・・・・・・

Lin Hong ignored her, came directly to the courtyard, opened the door, and walked in.

Although the courtyard is old-fashioned, it has been rested and reinforced, and security doors and the like are installed, and the security measures are relatively in place. However, Lin Hong was still a little uneasy, he was already planning to get two wolf dogs to keep in the yard.

"Jingjing, he's too much of a bully!" Wang Yuqing said angrily.

"Uh・・・・・・ he shouldn't have targeted you on purpose, maybe because he's in a hurry, he does drive faster, and that's the same when we came, I guess I've been taken several photos of speeding violations today."

"When it's time, you're still talking to him!" Wang Yuqing clenched her fists, "He did it on purpose, I'm not done with him!" Let him be careful, don't fall into my hands, or ...... Hum! ”

Xu Wenjing had no choice but to nod and say, "Okay, my police officer, I will definitely warn him." Let's go in, I don't know what he's doing here, it's mysterious. ”

"Hmph, he's just pretending to be a ghost, only you will believe him!"

Xu Wenjing finally calmed down Wang Yuqing's mood.

The two of them entered the courtyard with some curiosity.

For the courtyard, the two of them are no strangers, they have grown up in such a courtyard since childhood, although they are now working and living outside, and they usually have to go back to see it regularly.

After looking at it for a while, Wang Yuqing seemed to have completely forgotten what happened just now, and she said curiously: "This yard is good, but it doesn't seem to be lived." Is this courtyard his own? How does he have the key? ”

"I don't know about this, I'll ask him directly."

The courtyard was a bit spacious, Xu Wenjing didn't see which room Lin Hong was in for a while, so he shouted loudly, and after hearing Lin Hong's voice, he found the room he was in.

When they entered, they found that there were a lot of electronic devices in that room, and they couldn't help but be even more curious.

Xu Wenjing walked to Lin Hong's side and saw that he was already playing the previous blackmail recording at the moment, and just wanted to speak, but Lin Hong raised his index finger and gently "shhh

Then, Lin Hong pointed to a microphone input device on the table in front of him, and Xu Wenjing immediately understood that Lin Hong was converting the audio tape into an audio file and inputting it into the computer.

She works at a television station and is familiar with this kind of process.

After the recording was played, Lin Hong said: "Okay, you can talk, just ask any questions." ”

Xu Wenjing: "What kind of place is this?" ”

"My lab, rented."

"Are you converting an audio tape into an audio file? Don't sell what you're doing, tell us about it. Xu Wenjing strongly demanded.

Lin Hong nodded: "Well, you're right. I had just converted the tape to an audio file, and I had heard some faint background noise in the tape and thought I should be able to spot some clues. ”

Wang Yuqing didn't speak again after she came in, and she also understood that Lin Hong wanted to use technical means to find some clues from the tape. With the development of science and technology, the police department has also set up such a technical department to assist in the detection of cases.

However, this kind of department has not yet been widely promoted, and it is only piloted in a few sub-bureaus in the capital.

Originally, Wang Yuqing wanted to be sarcastic, but when she thought of the identity of the other party's Shuimu student, she suddenly became a little uncertain.

Maybe he'll really find something...... Thinking like this, Wang Yuqing decided to wait and see what happened

Lin Hong was actually able to hear the background noise, but in order to be more accurate and to better explain the reason, he had to use a little technical means.

Sound is actually a kind of audio, and the audio recorded by the other party using the audio tape is an analog signal, which Lin Hong converted into a digital signal and stored it on the computer, the purpose of which is to facilitate the processing of the audio in it.

Lin Hong listened carefully to the tape several times, and when the other party spoke, there was a part of the noise behind him.

Lin Hong's purpose now is to separate that part of the noise.

That person's voice was very hoarse, and Dong Zhi'an's voice was also very distinctive, so their audio amplitude was about the same, with a series of similar characteristics, which was also the basis for Lin Hong to be able to deal with it.

Lin Hong connected to the Internet and downloaded an open-source audio processing program on the Internet.

This program, which is a software dedicated to the tracking and analysis of signals in hams, has been very popular with hams since its inception because it can improve the resolution of radio signals.

Of course, this software is not limited to the field of wireless communication, as long as it is an audio file, it can analyze and restore it, showing a certain amplitude of the audio track.

Although the software is not big, it took a lot of time to download, mainly because the current domestic network speed is too slow.

The file is opened, the previously recorded audio file is loaded into the software, and a graphical audio track pattern is displayed.

Lin Hong stared at the monitor for a while, then clicked the play button, and the audio track on it began to move, and at the same time, the sound of the kidnapper speaking began to play in the speaker.

Next, Lin Hong began to process this audio, and he first had to filter out the voices of the kidnappers and Dong Zhian.

This part is not difficult, the voices of the kidnappers and Dong Zhian are very distinctive, and their audio vibrations are similar.

The out-of-the-box function in Lin Hong's software removed the audio tracks of the kidnappers and Dong Zhi'an, leaving only background noise, and then he used the doubling function to superimpose and double the remaining audio.

After doing this a few times, I clicked the play button again, and the amplified background noise suddenly came out.

“…… Doot-drip-drip-doo-toot-toot......"

“…… Feed...... Restaurants...... Ordering ......"

“…… Fuck ...... me Recording...... Syllable! ”

This background noise was completely meaningless at first, and none of them, except for Lin Hong, noticed it, thinking that it was just a noise around them.

Now that Lin Hong has been dealt with like this, it has been so clear, and Wang Yuqing can't help but look at Lin Hong with admiration.

The voice was choppy, listening to the content, it seemed that the person was making a phone call to order food, and then someone hung up.

When Wang Yuqing heard these contents, she suddenly perked up: "Can you make the voice clearer?" The man seemed to be talking about a restaurant. ”

Xu Wenjing was also very happy when she heard these contents, and praised Lin Hong again and again.

If you can know which restaurant it is, then you can locate it by checking the name of the industrial and commercial record, and then according to the call records of the other party, you can find out where the kidnappers are. If the other party did not transfer the location, the matter would be simple.

Lin Hong nodded: "I'll try." ”

He continued to process the rest of the track, constantly filtering the noise, and then multiplying the track, and finally the content was clearer and clearer, and the sound quality was getting better and better.

But unfortunately, the specific name of the restaurant has never been clear, but when he dialed the number earlier, the key sounds were relatively clear.

Wang Yuqing couldn't help but be a little disappointed, she asked reluctantly: "Can you make up for the missing content?" ”

Lin Hong shook his head: "It can only go so far, there is just a voice in the middle that covers up this part of the audio track, and under the frequency neutralization, it is completely impossible to separate, and it is completely good to be able to do this." ”

"Hey, so this method doesn't work to find clues?" Xu Wenjing asked regretfully.

Wang Yuqing suggested: "Otherwise, I'll bring the tape back to the bureau and let the professionals analyze it, maybe they can process this part of the content." ”

Lin Hong smiled: "It's the same for anyone you find." ”

"Although you have good skills, you are also too confident, you know, too much confidence is arrogance." Wang Yuqing retorted unceremoniously.

Lin Hong glanced at her, ignored it, and continued to process the remaining results.

Xu Wenjing saw that he still hadn't given up, and a burst of hope couldn't help but rise in his heart.

"Stone, do you have a way?"

She is well aware that Lin Hong's skills are very strong, which can be seen from the fact that he was able to win the individual championship of the WWCQ competition with his own skills.

Lin Hong nodded: "If you want to know the phone number of that restaurant, you don't have to listen to him say it himself, in fact, the voice in it contains this information." ”

Xu Wenjing: "Really7, that's great!" ”

Wang Yuqing moved her lips, but finally didn't say anything. She suddenly realized that she was a little out of shape, even if the other party had played pranks on her before, she shouldn't be emotional in this kind of thing, and always aimed at him. After all, he is now doing his best to help Sister Huilan.

What's wrong with me?

Wang Yuqing felt that she was not such a stingy person, why did she always think that this guy in front of her was so hateful?

While she was thinking wildly, Lin Hong had already begun to try another way to decipher the clues left in the audio.