Chapter 282 Voiceprint Identification Analysis Results
The case is a previous one, so there is no need to worry.
The High Speed Rail New Area also heard that Lu Chuan could do voiceprint analysis, so they sent it over to try it out.
The speech chart instrument arrived earlier than scheduled and was delivered to the Criminal Investigation Detachment on Wednesday afternoon.
What Qin Yong arranged to purchase was a domestically produced speech chart instrument. This device was previously manufactured abroad, and domestic research and manufacturing only began more than 20 years ago.
Even if it is made in China, the price of this thing is not low.
Among the dozens of equipment in the current survey laboratory, it can be regarded as the most valuable.
There are not many current investigators, but in terms of the total assets of the entire criminal investigation detachment, the current survey office can be ranked first.
There are nearly forty pieces of equipment, large and small.
Although Lu Chuan received the intermediate voiceprint identification and analysis skill rewarded by the system, he had the method of using a voiceprint instrument among his skills and experience.
But in reality, Lu Chuan saw the actual Yutu Yi for the first time today.
“Just this thing... costs 300,000?”
Lao Bai was amazed as he watched the factory staff assembling and debugging the equipment.
It's not a big thing, just three small rectangular boxes, connected together by various wiring harnesses.
Two of them are all buttons, and it looks like there are dozens of them.
This thing is not particularly easy to operate at first glance. With so many buttons, it is probably impossible to figure it out without a period of study.
The other one has a screen window in the lower left corner. You can tell it is black and white by looking at the color.
“Just look at the results here?”
Lu Chuan nodded: “This is the most advanced speech chart instrument currently on the market. It can directly record and analyze the target sound, and can also Import audio for analysis. ”
General speech-graphic instruments collect the sound through a dedicated microphone and then continue to analyze it in real time.
This speech chart analyzer is different. It can directly import audio data into the system. This avoids sound pollution caused by secondary collection and improves the analysis accuracy a lot.
“When did you learn to use this?”
Lu Chuan touched his head: “I came across this when I was in college. We have this kind of language chart instrument in our laboratory.”
It’s college again.
Lu Chuan’s admission to university was really not in vain.
Yang Sen suddenly had some fantasy. If his son could learn half as much as Lu Chuan in college, no, only one-third of his skills, he would be fine in the society.
The debugging of the equipment was completed quickly, mainly to test whether the equipment is intact.
The staff themselves do not know how to analyze voiceprints. They just connect the wiring harness according to the process set by the manufacturer, test it with different sounds, and compare and analyze the results with standard pictures.
After several processes, it was determined that there was no problem with the machine, and Liu Guodong signed the acceptance form, which was considered completed.
The items purchased by the Criminal Investigation Detachment are not just bought by whomever they want, but are all centralized and purchased online.
However, the purchaser put in things that were not available in response to the needs of the criminal investigation detachment.
Of course, there is no discount at this price. It is definitely the manufacturer's retail price without any discount.
"Master, you guys go up and have a rest first. I'll go over after analyzing the recording."
"No, no, no, we're just watching here. We haven't seen the voiceprint identification yet. As for analysis, let’s learn how to do it.”
Liu Guodong waved his hand, now that he is familiar with it, there is no need to hide it.
Lu Chuan didn't care, this thing was hard to learn.
The identification and analysis of voiceprint does not mean that the result will appear on the other end when the voice is entered at the input end of the machine. Of course, you can do it this way, but if you do it this way, basically everyone's voice will get the same spectrum analysis.
It cannot reflect the specificity. This thing is just a relatively expensive toy.
Lu Chuan wanted to extract the different frequencies of the sound by debugging the equipment, and then conduct comparative analysis.
Men's and women's voices sound different. In fact, it is mainly determined by the frequency and fullness of the voice.
Generally speaking, the frequency of female voices is higher and the frequency of male voices is lower.
Female voices are fuller in the high frequency range and sound crisper.
Male voices have stronger fullness at low frequencies, so they sound deeper.
It is not very fast to analyze the voices of four people. Lu Chuan needs to repeatedly record the original sounds, and then debug the equipment to analyze different frequencies.
In the eyes of Liu Guodong and others, Lu Chuan was just spinning the buttons and taking pictures of the analyzed maps.
Actually, this instrument can print out sound maps, but Lu Chuan did not do so.
Print the map just for comparison. Lu Chuan took it with his mobile phone, which is very convenient for comparison.
After struggling for almost an hour, Lu Chuan turned off the Yutuji.
“Done?”
"That's almost it. We'll have a report in a minute."
The speech graphics instrument only performs spectrum analysis on the sound, and is not smart enough to report on the sound analysis results.
Successful voiceprint identification analysis results often provide more information than expected.
For example, age range, weight range, residence range, eating habits, etc., can all be obtained through voiceprint analysis.
The voiceprint analysis just done in the underground laboratory is just basic data analysis and the data basis for drawing conclusions.
What Lu Chuan is doing now is the essence of the entire voiceprint analysis.
Lu Chuan numbered the sounds in the recording according to the time they appeared.
"Female voice No. 1, Mandarin Level 2 B, Dingzhou accent, age between thirty-five and forty-five years old, weight about sixty kilograms."
"Two Male voice, Level 3 Mandarin, southern Zhezhou accent, age between forty and forty-five years old, weighing about 90 kilograms, and has the habit of eating spicy food all year round."
"Three. Male voice, second-level Mandarin, Haizhou accent, age between thirty-five and forty years old, weight about 70 kilograms.”
"Girl No. 4, Mandarin Level 2 B, Haizhou accent, age between 20 and 25, weighing about 50 kilograms, vocal cord laceration, repair surgery about five years ago."< br>
Liu Guodong looked confused when he took the voiceprint identification and analysis report issued by Lu Chuan.
What's going on?
Can you tell someone’s age just by listening to their voice?
Okay, let’s not talk about the accent. It doesn’t require professional analysis. Liu Guodong himself can tell the difference between the Haizhou accent and the accents in other places.
Regardless of age, people of different ages do have different voices in thickness and timbre.
But what about weight?
How to analyze weight through voice?
That’s nonsense, right?
Not to mention eating chili peppers, can you hear this?
The last one is even more outrageous. Liu Guodong has listened to this recording many times.
The last female voice was very hoarse, sounding like the voice of a middle-aged woman in her forties or fifties.
How could it be a young woman in her twenties?
Lao Bai and Yang Sen also came over and saw the conclusion of the analysis report made by Lu Chuan.
"Xiao Lu, is it true or false?"
(End of this chapter)