There was a case in Germany: a boy was * * after school. Just as the child's father was fidgeting at home, a strange accent called and offered to redeem the child immediately with a large sum of money. The child's father tactfully asked for a day and a night to raise money, and made an agreement with the stranger to call again the next day. Inform the time and place of payment.
Putting down the phone, the father reported the case to the police station. So, the police eavesdropped and recorded the next day's call with special equipment. On the third day, the local radio station broadcast a pay? Looking for you? The basic situation is: male, 42 ~ 43 years old, from North Westphalia, manual worker, bald and obese. Then, a clip of this person's voice was played. Within a whole hour after the broadcast, hundreds of residents flocked to the police station, and eight of them sued the same person. So, the man was immediately detained. After the trial, it was proved that this man was a criminal ―― he was a carpenter, aged 42, born in Westphalia. Obesity and baldness
This case is to identify criminals by voice and solve the case by voiceprint recognition. It turns out that human voice, like human appearance, has various characteristics. Because the human vocal system is composed of 45 physiological structures, such as vocal cords, mouth, nasal cavity, tongue, teeth, lips and lungs, and they are all different? Component? Composition, and each? Component? Because of the different speaking habits and methods, it is appropriate to use 100 when speaking. Posture? Thus, human voice can have 45 100 timbres, and everyone has unique voice characteristics. Scientists can display the characteristics of everyone's voice by using the method of sound spectrum analysis, and the display result is what we call voiceprint.
Modern scientific research shows that voiceprints are not only specific but also relatively stable. After adulthood, people's voices can remain relatively stable for a long time. Experiments show that no matter whether the speaker intentionally imitates the voice and tone of others or whispers, even if the imitation is vivid, the voiceprint is always the same. Based on these two characteristics of voiceprint, investigators can compare the obtained voiceprint of criminals with the voiceprint of suspects through voice recognition technology, quickly identify criminals and provide reliable evidence for investigation and solving cases.
German police not only skillfully use voiceprints to solve crimes, but also use ear prints to solve crimes. In a court somewhere, a policeman was accused of planning a bank robbery. The surveillance video seems to confirm that the policeman and the robber are the same person. Just as the jury was about to convict him, the famous anthropologist Frederick? Rosin was the first to put forward a new idea about the shape and size of ears in court to help solve the case. He testified in court: Like fingerprints, ear prints are unique, and the ears of police officers are completely different from those of robbers in the video. ? So as to put an end to the unjust situation.
Since then, Dr. Rosin has led a research team to compare the ears of criminals in videos or photos with those of arrested suspects, so that ear prints can play an important role in solving crimes.
As we all know, fingerprints used to be strong evidence to solve crimes. And people's fingerprints can be covered by gloves, so that criminals will not leave fingerprints when committing crimes. Ear prints are different. Even if the criminal wears a nylon mask, the ear prints of the criminal can be removed through photos. Researchers believe that ear prints are as unique as human birthmarks or fingerprints. Even identical twins have different ear prints, and everyone's left ear and right ear are different.
With the rapid development of video surveillance cameras, the idea of ear print database is becoming more and more feasible, which plays a role in solving crimes and makes criminals have nowhere to escape.