Attending ex-girlfriend's wedding, arresting the groom's officer on the spot

Chapter 283 Simply Incredible
of course it's true.

Lu Chuan rubbed his hands and completed the voiceprint identification of the four voices in one go, which was not an easy task.

What's more, this is Lu Chuan's first voiceprint analysis.

Somewhat unskilled, many details need repeated analysis and consideration.

For example, boy No. [-] has the habit of eating chili for a long time.

Although the accent of the No. [-] boy is from Zhejiang Province in the south, in fact, the habit of eating spicy food in Zhejiang Province is not very prominent.

"Chili is an irritating food. After long-term consumption, it will stimulate the vocal cords, which will cause a very large change in a certain frequency of the voice."

The voiceprint identification analysis report issued by Lu Chuan not only has conclusions, but the process of each conclusion is very detailed.

"Ordinary people, without special training, the frequency range of sound will not reach the limit."

Lu Chuan pointed to the second chart on the report: "Only a very powerful bass singer can lower the frequency of the voice to the lowest 82 Hz."

"And not to mention 82 Hz, those that can be placed below 90 Hz are all very talented in bass."

"Long-term consumption of chili peppers can cause low-frequency changes in people's voice."

"To put it bluntly, it is to make the sound appear in the low frequency range with a spectrum."

"Among the four voices, only male voice No. 89 has a spectrum in this frequency band of [-] Hz."

"Furthermore, the change of this map is irregular, and it is unlikely to be formed naturally. It should be the change caused by the stimulation of the vocal cords. Therefore, I judge that the male voice No. [-] often eats chili peppers."

After listening to Lu Chuan's explanation, the three looked at each other, which really increased their knowledge.

"What about your weight? How do you judge your weight by listening to the sound?"

"It starts with the shape of the vocal cords."

Lu Chuan said while gesticulating: "The vocal cords have a wedge-shaped structure, which is composed of vocal cords, vocal cord muscles and mucosal covering layer. There is a fold on each side, and there is a small slit-shaped space in a relaxed state."

"There are subtle differences in the shape of the vocal cords in people of different weights."

"Specifically, when it comes to the voiceprint spectrum, there will be more prominent features in different frequency ranges."

"Moreover, this feature, like eating chili, is mixed in the sound and is not easy to be detected by the human ear, but it can be found after analysis by the language graph instrument."

This is the identification and analysis of the voiceprint atlas, and everyone can analyze the voice through the language graph instrument.

However, how to use the language graph instrument to extract the sound spectrum of different adjusted frequencies, and then analyze the results through specific frequencies is not something ordinary people can handle.

"People with different weights will have different characteristic spectrum performances at the three frequencies of 306 Hz, 803 Hz and 902 Hz."

"Through certain calculations, the weight of the owner of the voice can be obtained."

"Of course, it may not be easy to understand, but some singers seldom change in weight. Why, it is because the change in weight will change the thickness of the vocal cord mucosa."

"This will indirectly lead to changes in the voice, and the original taste may not be sung when singing."

"I'm stupid, so there is such a saying?!"

Lao Bai has lived his whole life, and this is really the first time he has heard of this.

However, if you think about it carefully, there should be some truth.

"What about number four, let's listen, the female voice number four should be in her 50s, how could she be in her 20s?"

In fact, when Lu Chuan listened to the recording with his ears, he had some doubts.

However, since there was no sound map to assist, Lu Chuan was not sure three days ago.

It's different now. The sound map of the fourth female voice confirmed Lu Chuan's guess.

"The voice of female number four is indeed older and hoarse."

"However, this kind of hoarseness and old age is not formed naturally, but is caused by damage to the vocal cords, which creates this illusion."

Lu Chuan opened the report and turned to the third-to-last page: "This is the voice spectrum of female voice No. 800. In the [-] Hz range, her voice spectrum is very irregular, which is the main reason why her voice sounds old and hoarse."

"But, look here," Lu Chuan pointed to a breakpoint in the map.

"This female voice has a breakpoint at 803 Hz."

Sure enough, there is a watershed at 803 Hz in the sound spectrum of female voice No. [-], and there is no link between the front and the back, and it seems to be broken here.

"What does it mean?"

Yang Sen was puzzled.

"This breakpoint means that the number four female voice has no sound at this sound frequency."

"That is to say, at this frequency, her vocal cords cannot produce sound."

"Generally, the sound spectrum of normal people is continuous. The difference is that different people's voices have different fullness at different frequencies. There is only one reason for this situation, that is, the vocal cords have been damaged."

"Is it possible that you were born this way?"

Lu Chuan shook his head: "This is related to the development of the vocal cords. It should be a natural growth process for people to develop the vocal cords from childhood."

"It's impossible for the middle piece to not grow well."

"Even if there is poor development, it should be able to make a sound, but the function is not perfect, and there will be no such sudden disconnection."

"Then why the laceration?"

Liu Guodong raised his own question: "I've heard that someone's vocal cords were damaged and had lacerations."

"This is also a conclusion based on the voiceprint characteristics of the breakpoint."

"After the vocal cords are torn, there will be a breakpoint in the sound spectrum in a short period of time."

"But because a laceration is often a single, or partial injury, it's unlikely that this segment will be one."

"The laceration injury is different. The vocal cords are torn, which may be caused by a sharp weapon. When the injury is injured, it is basically impossible to make a sound, and there is no way to recover after recovery."

The voiceprint identification and analysis done by Lu Chuan is based on the voiceprint atlas.

Therefore, every conclusion here can be used as judicial evidence.

"I suggest that the Criminal Police Brigade of the High-tech Zone focus on searching for the fourth female voice."

"The possibility of damage to the vocal cords is not high."

"Furthermore, the accent of female voice No. [-] is from Haizhou. On our side, there are only a few top-tier hospitals that can perform vocal cord restoration surgery."

"Combined with the age of the other party, the time for surgery should be between 23 and [-] years old, and it should be easier to screen."

"Okay! I'll call Yuan Shaokang right away."

After listening to Liu Guodong, he felt full of confidence.

Female voice No. [-] has experienced damage to her vocal cords, so it will be easier to find her.

After Yuan Shaokang got the voiceprint identification and analysis report, he also looked confused.

Can you get such detailed information by listening to the sound?
Early the next morning, Yuan Shaokang arranged for three groups of people to investigate in three large tertiary hospitals in Haizhou City.

As a result, Yuan Shaokang was extremely pleasantly surprised!
(End of this chapter)