Pulse lie-detection method based on linear frequency modulation and device thereof

Abstract

The invention discloses a pulse lie-detection method based on linear frequency modulation and a device thereof, according to the invention, a sensor adopts a non-array ultrasonic probe to emit linearfrequency modulation continuous signals, and the linear frequency modulation signals have the advantages of accuracy, multipath resistance and artifact removal. In combination with pre-distortion processing, pulse compression and a layered inversion echo algorithm, the position (depth) of each reflection surface is obtained through time delay between reflection echoes; the amplitudes of the transmitting signal and the echo signal in each reflecting layer can be inverted in an iterative manner by utilizing an attenuation function of the ultrasonic wave in the body, and a reflection coefficientof each reflecting surface is calculated; the reflection coefficient can determine the tissue composition of each reflection layer, and multi-dimensional pulse information such as pulse depth, frequency and amplitude is obtained, so that multi-dimensional reference can be provided for judgment of a lie detection result.

Description

technical field [0001] The invention relates to the technical fields of acoustic detection, signal processing and the like, in particular to a pulse lie detection method and device based on linear frequency modulation. Background technique [0002] Polygraph technology is a criminal psychological test technology. In the early stage of investigation, investigators found the suspect according to the situation of preliminary investigation and investigation, but there is no conclusive evidence to determine whether the object is a criminal. method, conduct a positive review to rule out or affirm criminal suspicion. But both the perpetrator and the innocent will try their best to defend and deny the crime. Some of their confessions are difficult to verify for a while, or even though they can be verified, it takes a lot of time and money. At this time, if polygraph technology is used, a large number of innocent suspects can be quickly eliminated, key suspects can be screened out, ...

AI Technical Summary

Problems solved by technology

The core is to sense the patient's pulse information through the pressure sensor fixed on the hand, and use the temperature sensor to calibrate the error of the pressure sensor. However, it still has some shortcomings of the tactile sensor, such as: low precision; the sensor and the wrist bonding layer Accuracy has a great influence on the results, and it is necessary to use high-precision, high-cost air pumps and hydraulic devices to reduce errors

[0005] Ultrasound has been used to collect pulse data for a long time because of its safety and non-destructive characteristics. For example: Chinese patent, application number: 200610083339.8, with the help of medical array ultrasonic three-dimensional imaging equipment, various parameters of pulse are obtained by obtaining three-dimensional graphics of pulse; but this method The pulse signal is used as the detection signal. The pulse signal is generally used for imaging, and it needs to be used in combination with an array probe, and the calculation process is complicated.

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