Chapter 276 Sound Analysis
Wang Guojun’s expression kept changing, and the light in his eyes came and went.
Chen Feng stood up and handed Wang Guojun a cigarette.
"Think about it for yourself. I went out to eat, and I haven't eaten for the whole day and night."
"Think clearly, call me."
After Chen Feng finished speaking, he turned around and left.
Although Chen Feng does not know as much about interrogation routines as the people in the criminal investigation detachment.
But there are ways to deal with these ordinary ruffians.
It's useless to tell them any big principles.
Scare?
It's no use either.
These guys are all a piece of meat who has been to prison several times.
Can't scare you at all.
Like Wang Guojun, he has no other relatives, only an old sick mother.
Then we can only start from this aspect.
Now, the Royal Army is clearly showing signs of relenting.
However, too much is not enough. Sometimes, you have to give him time to think alone.
Just when Chen Feng was about to leave the interrogation, Wang Guojun suddenly spoke.
“Stop!”
Chen Feng turned around: “Have you thought clearly?”
Wang Guojun shook his head: "I want to know, how are you sure that I am the one who kidnapped Liu Bai?"
He arranged the entire crime process perfectly.
How was Song Hui exposed?
Did he betray himself?
It is impossible for Erpi and Xiaopang, these two people have been with him since the kidnapping.
Song Hui is the only flaw.
But why did Song Hui betray himself?
The two million gambling debt is not fake, it was paid by Wang Guojun and others.
For Song Hui, this is a business that can only succeed but cannot fail.
After taking ten thousand steps back, Song Hui only knew that his name was Wang Laohu.
In the entire Haizhou, there are not even a hundred but eighty people with this name, right?
This is still my nickname.
I can’t figure it out, I can’t figure it out at all.
It was precisely because he felt that his arrangements were perfect that Wang Guojun dared to go home and cook for his mother blatantly.
“Is it Song Hui?”
Chen Feng stopped and turned around. Wang Guojun's eyes widened and he stared at him.
"Not really."
The information provided by Song Hui was indeed unable to pinpoint Wang Guojun.
At the very least, there is no way to lock it in a short time.
You have to hire a professional portraitist to draw a portrait based on Song Hui's description and then compare it.
This process cannot be completed in an hour or two.
"There was a pinhole camera in the room where you and Song Hui kidnapped Liu Bai. We locked Song Hui through the secret video."
"As for you...the video was not taken I know your face, but you left fingerprints on the luggage cart that transported Liu Bai. Our on-site detectives locked your identity based on fingerprint identification analysis.”
Sneak video?
Fingerprint identification?
Wang Guojun had robbed and stolen, and learned criminal law in prison.
But candid photography... what is this thing?
Fingerprint identification is just that. Wang Guojun knew what was going on when he watched TV.
"What... candid filming?"
Chen Feng said nothing, shook his head, and left the interrogation room.
The criminal policeman who recorded it packed up his computer and left.
The process of locking down the Royal Army was indeed a bit of a coincidence.
This is just bad luck.
In the current survey office, Liu Guodong and Yang Sen Laobai are still studying the phone recording.
How did Lu Chuan accept the intermediate voiceprint identification and analysis skill rewarded by the system? The identification and analysis of voiceprints requires the use of a specialized speech-graph instrument, which aims to convert the sound into a strip-shaped or curve-shaped image.
In voiceprint identification, this image is used as a speech map.
When a person grows up, due to the development of vocal cords, there will be a period of voice change from childhood to adolescence.
After the voice-changing period, the development of vocal cords basically stops, and the adult voice is relatively unique.
As long as the vocal cords are not damaged by external forces, the sound will remain relatively unchanged for a long time.
This long-term stability gives the possibility of forensic identification of sounds.
Intermediate skill cards are loaded quickly.
But the detachment currently does not have a voice-picture device for Lu Chuan to collect the voice in the phone recording.
Of course, collecting is useless.
Wang Guojun has been captured, and the identification of the voice is meaningless now.
What Liu Guodong wants is ambient sound on the phone.
"Master, let me try."
Liu Guodong handed the phone to Lu Chuan: "Let's see if we can find anything. You are young and have good ears. Can we old guys listen? Nothing useful."
Lu Chuan nodded, took the phone, and pressed the play button.
Intermediate voiceprint identification and analysis skills, in addition to using a speech chart instrument to determine the attributes of sounds, more importantly, listening with human ears is used to find the different characteristics of sounds.
Otherwise, just buy a voiceprinter and anyone can do voiceprint identification.
The actual situation is that human voices are at a relatively fixed frequency. The voices of different people sound very different, but the data are all similar to the same strip.
People without experience cannot analyze it at all.
"Brother Bai, can you use your headphones?"
Lao Bai practices his voice in the morning and likes to listen to Peking Opera when he has nothing to do during the day, so he got his own headphones.
It comes in handy now.
The headphones used by Lao Bai are relatively high-end, capable of wired and Bluetooth.
Lu Chuan connected the Bluetooth, put on the headphones, and started the sound from the lowest level and slowly increased the volume.
He focused on the time period when Liu Bai was talking.
Liu Bai did not change his voice through a transducer when he spoke, and the recording captured the surrounding sounds in more detail.
What Lu Chuan has to do now is to layer the sounds.
Deliberately ignore and weaken Liubai's voice.
This is very difficult for ordinary people or people without training.
In the midst of noisy sounds, our spirits are often more attracted to the loudest sounds.
In the voiceprint identification analysis of system rewards, there is a method similar to self-hypnosis.
It can make Lu Chuan focus on the sound he wants to hear.
Lu Chuan put on the headphones, closed his eyes, and was completely immersed in the world in the headphones.
Liu Bai's voice was like a hollow background sound, which was gradually blocked or deliberately ignored by Lu Chuan.
And all the energy is focused on the weak part of the sound background.
Da da da.
Free of the knocking sound of a blaster?
Woo, woo, woo...
The alarm sounded continuously.
Lu Chuan listened to the recording repeatedly and took off his headphones after more than ten minutes.
"Xiao Lu? How are you?"
Lu Chuan raised his head and looked at Lao Bai, but because he had just adjusted the recording to the maximum for a long time, his hearing was a bit weak now.
It felt like Lao Bai’s voice was coming from the horizon.
Fortunately, I can hear clearly.
Lu Chuan shook his head, made an OK gesture, walked to his desk, took a sip of water, and calmed down a little.
“Something gained.”
"I heard a clicking sound in the recording, like the impact of a demolition hammer."
"There is also the siren of a fire truck."
(End of this chapter)< br>