Chapter 355 Audio Clues

A red BMW roared and stopped in front of the quadrangle house rented by Lin Hong.

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

Then, Lin Hong and Xu Wenjing also came out of the car respectively.

Xu Wenjing hurried to Wang Yuqing, who was vomiting, stroked the other party's back, and asked with concern, "Yuqing, are you all right?"

After saying that, she turned her head and looked at Lin Hong animly: "What are you doing driving so fast?"

Lin Hong looked innocent: "It's not my fault. I have reminded her before to fasten her seat belt."

Wang Yuqing just calmed down a little. Hearing Lin Hong's words, he suddenly felt depressed again. Just as he was about to say something, he suddenly felt a wave rushing up to his throat, and suddenly had to bend down again...

Lin Hong ignored her and went straight to the courtyard, opened the door and walked in.

Although the quadrangle courtyard is old-fashioned, it has been rested and reinforced, and anti-theft doors have been installed, and the security measures are in place. However, Lin Hong is still a little worried. He is already planning to keep two wolf dogs in the yard.

"Quiet, he is too bullying!" Wang Yuqing said angrily.

"Uh... He should not have targeted you on purpose. Maybe it's because he is in a hurry. He drives fast, and it was the same when we came. I guess I have taken several photos of speeding violations today."

"At this time, you still speak for him!" Wang Yuqing clenched her fist and said, "He did it on purpose. I can't finish with him!" Let him be careful, don't fall into my hands, or... hum!"

Xu Wenjing had to nod and said, "Okay, my police officer, I will definitely warn him. Let's go in. I don't know what he did when he came here. It's mysterious.

"Hmm, he's just pretending to be a ghost, and only you can believe him!"

Xu Wenjing managed to calm Wang Yuqing down.

The two of them entered the yard curiously.

For the quadrangle courtyard, both of them are familiar with each other. Although they have grown up in such a yard since they were young, they now work and live outside, they usually have to go back regularly.

After watching it for a while, Wang Yuqing seemed to have completely forgotten what had just happened. She said curiously, "This yard is good, but it seems that there is no one to live in it. Is Jingjing's yard his? Why does he have the key?

"I don't know about this either. Ask him directly later."

The yard was a little spacious. Xu Wenjing didn't see which room Lin Hong was in for a moment, so she shouted loudly. After hearing Lin Hong's voice, she found his room.

After they went in, they found that there were a lot of electronic devices in the room, and they couldn't help but be more curious.

Xu Wenjing walked to Lin Hong and saw that he was already playing the previous blackmail recording at this moment. Just as he was about to speak, Lin Hong raised his index finger and gently "booed".

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

She works in a TV station and is familiar with this process.

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

Xu Wenjing: "Where is this place?"

"My lab is rented."

"Are you turning the tape into an audio file? What the hell are you doing? Don't do anything. Tell us about it. Xu Wenjing strongly demanded.

Lin Hong nodded: "Well, you're right. I just turned the tape into an audio file. I heard some weak background noise in the tape before, and I thought I should be able to find some clues.

Wang Yuqing didn't say anything after she came in. At this time, she also understood that Lin Hong wanted to use technical means to find some clues from the tape. She also knows a little about this method. With the development of science and technology, the police station has also set up such a technical department to assist in the detection of cases.

However, this kind of department has not been widely promoted at present, and it has only been piloted in several branches in the capital.

Originally, Wang Yuqing wanted to say a few words of sarcasm, but when she thought of the identity of the other party's Shuimu student, she was suddenly a little uncertain.

Maybe he can really find something... Thinking of this, Wang Yuqing decided to watch the change. Lin Hong was actually able to hear the background noise, but in order to be more accurate and better explain the reason, he had to use a little technical means.

The sound is actually an audio. The audio recorded by the other party with the tape is an analog signal. Lin Hong converted it into a digital signal and stored it on the computer. The purpose of this is to facilitate the processing of the audio in it.

Lin Hong listened to the tape carefully several times. When the other party was talking, there was some noise behind him.

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

That person's voice is very hoarse, and Dong Zhi'an's voice is also very characteristic, so their audio amplitudes are similar, with a series of similar characteristics, which is the basis of Lin Hong's ability to deal with it.

Lin Hong connected to the network and downloaded an open source audio processor on the network.

This program is a software specially used for signal tracking and analysis of hams. Since its birth, it has been greatly welcomed by hams because it can improve the resolution of radio signals.

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

Although the software is not big, it takes a long time to download, which is mainly because the current domestic network speed is too slow.

Open the file, load the previously recorded audio file into the software, and the audio track pattern of a graphical interface 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. At the same time, the sound of the kidnappers began to play in the speaker.

Next, Lin Hong began to process the audio. First of all, he had to filter out the voices of the kidnappers and Dong Zhi'an.

This part is not difficult. The voices of the kidnappers and Dong Zhi'an are very characteristic, and their audio vibrations are similar.

The ready-made function in Lin Hong's software removed the soundtrack of the kidnapper and Dong Zhi'an, leaving only the background noise, and then he used the doubling function to superimpose the remaining audio.

After a few times, click the play button again, and the enlarged background noise was immediately played.

"...du-di-du-du-du..."

"...Hey...restaurant...order..."

"...I'm fucking... recording...pop!"

This background noise was completely meaningless noise at the beginning. None of them, except Lin Hong, noticed it and thought it was just the noise around them.

Now that he has been dealt with by Lin Hong, it is so clear that Wang Yuqing can't help but look at Lin Hong with new eyes.

The sound was intermittent. Listening to the content, it seemed that the man was calling to order a meal, and then someone hung up the phone.

When Wang Yuqing heard this content, she suddenly cheered up: "Can you make your voice clearer?" The man seems to have talked about which restaurant.

Xu Wenjing was also very happy to hear this content, and repeatedly praised Lin Hong for his power.

If you can know which restaurant it is, you only need to check the name of the industrial and commercial record to locate it, and then according to the other party's call record, you can find the location of the kidnappers. If the other party does not have a transfer location, the matter will be simple.

Lin Hong nodded: "I'll try."

He continued to process the remaining audio tracks, constantly filtered the noise, and then superimposed and multiplied the audio tracks. In the end, the content became clearer and clearer, and the sound quality became better and better.

But unfortunately, it is still not clear what the specific name of the restaurant is, but when he dialed the phone earlier, the buttons were relatively clear.

Wang Yuqing couldn't help but be a little disappointed. She asked without relentlessly, "Can you make up for the missing content?"

Lin Hong shook his head: "It can only be reached this extent. There happens to be a voice in the middle that covers up this part of the audio track. Under the frequency of neutrality, it can't be separated at all. It's completely wrong to be able to do this step."

"Oh, so this method doesn't work to find clues?" Xu Wenjing asked with regret.

Wang Yuqing suggested, "Why don't I take the tape back to the bureau and let the professionals analyze it. Maybe they can deal with this part of the content."

Lin Hong smiled and said, "It's the same for everyone you find."

"Although you are good at it, you are too confident. You should know that excessive self-confidence is arrogant." Wang Yuqing refuted rudely.

Lin Hong glanced at her, ignored her, and continued to deal with the rest of the results.

Seeing that he still did not give up, Xu Wenjing couldn't help but feel a burst of hope in her heart.

"Stone, do you still have a way?"

She knows very well that Lin Hong's technology is very strong, which can be seen from the fact that he can win the individual group championship of the WWCQ competition with his own ability.

Lin Hong nodded: "If you want to know the phone number of that restaurant, you don't have to listen to it yourself. In fact, the sound in it contains this information."

Xu Wenjing: "Really? 7 That's great!"

Wang Yuqing moved her lips and didn't say anything in the end. She suddenly realized that she had lost her temper. Even if the other party had played a prank on her before, she should not be emotional about this kind of thing and always targeted him. After all, he is now doing his best to help Sister Huilan.

What's wrong with me?

Wang Yuqing feels that she is not such a stingy person. Why does she always feel that the guy in front of her is so hateful?

Just as she was thinking, Lin Hong had begun to try another way to crack the clues left in the audio.