Chapter 283 is simply incredible
Of course it is true.
Lu Chuan rubbed his hands and completed the voiceprint identification of four voices in one go. It was not an easy task.
What's more, this is Lu Chuan's first time doing voiceprint identification analysis.
Still somewhat unskilled, many details require repeated analysis and consideration.
For example, boy No. 2 has a long-term habit of eating chili peppers.
Although the accent of boy No. 2 is from Zhezhou in the south, in fact, Zhezhou’s spicy eating habit is not very prominent.
“Chili pepper is an irritating food. After long-term consumption, it will cause certain stimulation to the vocal cords, which will cause a very large change in a certain frequency of the sound.”
Issued by Lu Chuan The voiceprint identification analysis report does not only have conclusions, but the process of each conclusion is very detailed.
“For ordinary people, without special training, the frequency range of sound will not reach the limit.”
Lu Chuan pointed to the second chart in the report: "Only a very powerful bass singer can lower the frequency of the sound to the lowest 82 Hz."
"And let alone 82 Hz, it can be lowered to below 90 Hz. All of them have very low-pitched voices.”
“Long-term consumption of chili peppers can cause low-frequency changes in people’s voices.”
“To put it bluntly, it means that the sound is in the low-frequency range. , a chart appears.”
“Among the four voices, only the voice of male voice No. 2 has a chart in this frequency band of 89 Hz.”
"Furthermore, the changes in this map are irregular. It is not likely to be born. It should be caused by stimulation of the vocal cords. Therefore, I judge that male voice No. 2 often eats chili peppers."
The three of them listened. After hearing Lu Chuan's explanation, they looked at each other, which really improved their knowledge.
“What about weight? How do you judge your weight by listening to your voice?”
“It starts with the shape of your vocal cords.”
Lu Chuan said and gestured: "The vocal cords have a wedge-shaped structure, consisting of the vocal cords, vocal cord muscles and mucosal covering layer. There is a fold on each side, and a small slit-like space can exist in the relaxed state."
"People of different weights have slightly different shapes of vocal cords."
"Specifically speaking, voiceprint patterns will have more prominent features in different frequency ranges."
"Moreover, This feature, just like eating chili peppers, is mixed in the sound and is not easily detected by the human ear, but it can be discovered after analysis with a voiceprint analyzer. "
This is the identification analysis of the voiceprint pattern, and it can pass. With Speechgraph, everyone can analyze sounds.
However, how to use a speech chart analyzer to extract sound spectra with different adjusted frequencies, and then analyze the results through specific frequencies, is not something that ordinary people can figure out.
"People of different weights will have different characteristic spectra at the three frequencies of 306 Hz, 803 Hz and 902 Hz."
"Through certain calculations, we can get the characteristics of the voice owner. Weight. "
"Of course, it may not be easy to understand, but some singers rarely change their weight. It is because changes in weight will cause changes in the thickness of the vocal cord mucosa. "< br>
“This will indirectly cause the voice to change, and you may not be able to sing the original taste when you sing.”
“Oh my god, so there is such a saying?!”
< br>
This is the first time that Lao Bai has heard of this in his whole life.
However, if you think about it carefully, there should be some truth to it.
"What about No. 4? Listen, the female voice No. 4 should be in her forties or fifties. How could she be in her twenties?"
This is actually what Lu Chuan is using. When I listened to the recording, I had some doubts.
However, because there was no sound map to assist, Lu Chuan was not sure three days ago.
It's different now. The voice map of female voice No. 4 confirmed Lu Chuan's guess. “The voice of female voice No. 4 is indeed older and hoarse.”
“However, this hoarseness and oldness are not caused naturally, but are caused by damage to the vocal cords. Illusion."
Lu Chuan opened the report and turned to the third to last page: "This is the voice spectrum of female voice No. 4. In the 800 Hz range, her voice spectrum is very irregular. The main reason why he looks 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, the sound spectrum of female voice No. 4 has a watershed at 803 Hz. There is no link between the front and back, and it seems to be broken here. .
“What does this mean?”
Yang Sen was confused.
“What this breakpoint means is that there is no sound at this frequency of female voice No. 4.”
"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 it is born like this?"
Lu Chuan shook his head: "This is related to the development of the vocal cords. It should be a natural growth process for a person to have a loud voice from childhood."
"It is impossible for the middle part to not grow well."
"Even if there is poor development, you should still be able to make sounds, but the function is not perfect, and there will not be such a sudden disconnection."
"Then why is it a laceration?"< br>
Liu Guodong raised his own question: "I have heard that some people have had their vocal cords damaged and had lacerations before."
"This is also a conclusion based on the breakpoint voiceprint characteristics. . ”
“After the vocal cord is lacerated, there will be a breakpoint in the sound spectrum within a short period of time. ”
"But because lacerations are often one or part of the injury, it is unlikely that this kind of segment is one."
"Large injuries are different. The vocal cords are cut, which may be caused by a sharp weapon. The injury He was basically unable to speak when he was injured, and he could not recover after recovery.”
The conclusion of the voiceprint identification analysis done by Lu Chuan is based on the voiceprint atlas.
So, every conclusion here can be used as judicial evidence.
“I suggest that the High-tech Zone Criminal Police Brigade focus on looking for female voice No. 4.”
"The probability of vocal cord damage is not high."
"Furthermore, the accent of female voice No. 4 is that of a local from Haizhou. The only ones who can perform vocal cord restoration surgery here are those Several tertiary hospitals. ”
“Based on the patient’s age, the time of surgery should be between 18 and 23 years old, so it should be easier to screen. ”
"Okay! I'll call Yuan Shaokang right now."
After listening to this, Liu Guodong felt confident.
Female Voice No. 4 has experienced vocal cord damage, so it would be easier to find her.
After Yuan Shaokang received the voiceprint identification and analysis report, he was also confused.
You can get such detailed information by listening to the sound?
Early the next morning, Yuan Shaokang arranged for three groups of people to investigate three large top-level hospitals in Haizhou City.
The result surprised Yuan Shaokang!
(End of this chapter)