KR20110027152A

KR20110027152A - Individual a lie detector

Info

Publication number: KR20110027152A
Application number: KR1020090085120A
Authority: KR
Inventors: 김영국
Original assignee: 김영국
Priority date: 2009-09-09
Filing date: 2009-09-09
Publication date: 2011-03-16

Abstract

The present invention measures the biosignal for a certain time such as the subject's pulse, blood pressure, precutaneous metabolism, respiration, and the like using the PPG sensor and predermal metabolism, and compares the measured biosignal with the measured biosignal thereafter. It is about a device that can detect a lie when out of the range of the existing measurement criteria.

The biosignal measuring machine of the existing polygraph was large and there were limitations on equipment movement. The present invention measures a biosignal using a small PPG sensor and converts the biosignal into a digital signal and stores the measured biosignal value within a reference range instead of using a polygraph, which is a recording device, to confirm the recording paper. If it is off, the portability of the lie detector is maximized so that it can be seen as a lie through an external signal.

Description

Portable lie detector {individual a lie detector}

The present invention measures the skin electroreflection using an electrode, and measures a biosignal such as respiration, heart vein, blood pressure, blood oxygen saturation using a small PPG sensor, and stores it digitally through a filter in an analog manner.

The present invention sets a criterion for the digitally converted file and compares it with the reference value to determine whether it is a lie, and if it is a false, a signal is found that the lie was found.

The present invention is based on measuring the bio-signal of human using PPG predecessor, and attaching electrodes to the palms and fingers and measuring the amount of current change.

PPG has a small sensor part consisting of a light source and a light receiving part, and is very inexpensive, and can be measured for a long time by an unrestricted human attachment method.

PPG (Photo-Pulse Pulse Wave) is a signal that measures the change in blood volume in blood vessels according to the heartbeat by absorbing, reflecting and scattering light. After detecting the transmitted or reflected light, the signal is analyzed to measure the pulsating component and the oxygen saturation in the blood according to the steady-state heartbeat.

Respiration-induced intensity variation (RIIV) can be extracted from the PPG signal through appropriate filtering and signal processing.

Skin electrical reflection is attached by two small electrodes to the part with mental sweating (palm or fingertip) and amplified the change of the current in two places and recorded through the recording device.

If the subject is subjected to various mental stimuli, the subject is not aware of it, but the glandular cells of the skin act reflexively and the electrical resistance of the skin decreases, increasing the current. This is called electric tooth reflection, or mental electrical phenomenon. The reaction occurs within 1-2 seconds after the stimulation, and reaches a maximum after 2-3 seconds, and then gradually returns to its original state.

Existing lie detectors measure respiration by using air pressure changes in the pleated rubber hose when breathing by installing a pleated rubber hose on the upper side and under the chest abdomen to measure respiratory and cardiac wave. During the measurement, a rubber hose was worn on the chest and electrodes were worn on various parts of the body, and the subject felt disgusted and the subject became unstable, which took a long time to prepare for the experiment.

Existing polygraphs use polygraphers to record various biosignals on paper.

The existing polygraph is not a single measuring device, and the composition of the device is complicated by using a respiratory wave detector, a cardiac wave detector, a polygraph, and various electrodes attached thereto. In addition, the measuring instruments are also high price, making it difficult for the general public to purchase.

Most of the devices that make up the existing polygraph are large, so the space occupancy is high, which makes them less portable due to the limitation of movement of the machines.

1) a sensor unit 110 for detecting a biological signal;

A signal processor 120 for determining a lie by comparing the detected biosignal with a reference biosignal; And a lie signal generator 130 generating a lie signal in response to whether the signal processor determines a lie.

2) The portable polygraph of claim 1, wherein the bio-signals are pulse signals, respiration signals, skin electrical reflection signals, and blood pressure signals.

3) The sensor unit 110 of claim 1, wherein the sensor unit 110 is attached to the two electrode sensors on a specific part of the human body skin electric reflection sensor 111 for measuring a change in the two minute current; And

A portable lie comprising a PPG sensor 112 comprising a light emitting element for injecting light into a specific part of the human body and a photosensor for sensing the light transmitted or reflected from the specific part of the human body to generate an electrical signal. detector

4) The method of claim 1, wherein the signal processing unit 120 includes a calculation module 150 for measuring and calculating the bio-signal in response to the output signal of the sensor unit; A storage unit 160 for storing a reference biosignal and a biosignal measured by the calculation module; A portable lie detector, characterized in that it comprises a 170 whether or not to determine the lie by comparing the reference bio-signal and the bio-signal measured in the calculation module

5) The portable polygraph of claim 4, wherein the signal processor 120 further includes a signal processing circuit 140 for processing an output signal of the sensor unit and transmitting the signal to the calculation module.

6) The signal processing circuit 140 of claim 5, further comprising: an amplifier 141 for amplifying an output signal of the sensor unit; And at least one of a first filter unit 142 for removing noise included in an output signal of the sensor unit.

7) The portable apparatus of claim 6, wherein the signal processing circuit 140 further comprises an analog-digital converter 143 for converting an output signal of the amplifier or the first filter unit into a digital signal. lie detector

8) The portable polygraph of claim 1, wherein the polygraph generator 130 comprises a speaker, a diaphragm, and an LED light.

9) The portable polygraph of claim 1, wherein the reference biosignal can be arbitrarily determined by a user.

The present invention is comfortable to carry with the PPG sensor, and the measurement technique is simple, so when the polygraph is attached to a specific part of the human body, the PPG sensor measures respiration, pulse, and blood pressure, and the two small electrodes change a small amount of current. Detect lie by converting the measured value to digital.

It does not use many instruments like the existing lie detectors, so anyone can use it easily anytime and anywhere, so they don't feel any discomfort or anxiety when using the product.

In addition, the present invention is only different from the method of measuring the biological signal by inheriting the existing lie detection principle, the present invention also detects the lie using pulse, respiration, blood pressure, skin electric reflection. Because the existing method has been used so far with high confidence, the result of the lie detection of the present invention can be more reliable than the small (sound wave, brain wave) lie detector currently on the market.

The present invention is meaningful to improve the inconvenience that comes from measuring the biosignal and the portability that the lie detector has so far, and to make a portable lie detector that can be used freely anytime, anywhere.

In order to solve the technical problem, the portable lie detector includes a sensor unit for detecting a biosignal, a signal processor for comparing and determining the detected biosignal and a reference biosignal, and an alarm signal in response to the determination of a lie. It characterized in that it comprises a lie signal generator for generating.

In the present invention, the portable polygraph is preferably a pulse, respiration, electrical skin reflection, blood pressure signal.

In the present invention, the portable lie detector device, the sensor unit is a light emitting element which is a PPG sensor for injecting light to a specific part of the human body and a photosensor for sensing the light transmitted or reflected from the specific part of the human body to generate an electrical signal It is preferred to have two electrodes prepared and ready to measure current using skin electroreflection.

In the portable lie detector according to the present invention, the signal processor is a storage module for measuring and calculating the bio-signal in response to the output signal of the sensor unit, the reference bio-signal and the storage unit for storing the bio-signal measured in the calculation module It is preferable to determine the lie by comparing the reference bio-signal and the bio-signals measured by the calculation module, and accordingly have a lie signal generator.

In the portable lie detector device according to the invention, it is preferable that the signal processing unit further comprises a signal processing circuit for processing the output signal of the sensor unit and delivers it to the calculation module.

In the portable polygraph according to the present invention, the signal processing circuit includes at least one of an amplifier for amplifying the output signal of the sensor unit and a first filter unit for removing noise included in the output signal of the sensor unit. desirable.

In the portable lie detector according to the present invention, it is preferable that the signal processing circuit further comprises an analog-to-digital converter for converting the output signal of the amplifier or the first filter into a digital signal.

In the portable lie detector device according to the invention, the lie signal generator is preferably made of a speaker, a diaphragm or LED lighting.

In the portable polygraph according to the present invention, the reference biosignal may be arbitrarily determined by a user.

Hereinafter, with reference to the accompanying drawings will be described in detail.

1 is a block diagram showing the configuration of a portable lie detector according to the present invention.

In FIG. 1, the portable lie detector device according to the present invention includes a sensor unit 110 for detecting a biosignal, a signal processor 120 for determining a lie by comparing the detected biosignal with a reference biosignal, and the signal processor lie. It is preferable to include a lie signal generator 130 for generating an alarm signal in response to the determination.

The sensor unit 110 includes a skin electric reflection sensor 111 and a PPG sensor 112. When the human body such as a finger contacts the sensor unit 110, the light of the light emitting device is irradiated to the finger, and when the breath or the pulse changes in the human body, the blood flow changes accordingly. At this time, the light affected by the blood flow in the finger is transmitted or reflected. The photosensor receives the transmitted or reflected light and detects a bio-signal, that is, a breathing signal, a pulse signal, and a blood pressure signal in the human body, and generates an electrical signal from the bio-signal. In skin electroreflective sensors, a minute amount of current is measured between two electrodes.

The signal processing unit 120 includes a signal processing circuit 140, a calculation module 150, a storage unit 160, and a false word determination unit 170.

The signal processing circuit 140 amplifies the output signal of the sensor unit 110, removes noise, and converts an analog signal into a digital signal. An operation of the signal processing circuit 140 will be described with reference to FIG. 2 along with FIG. 1.

That is, the optical signal affected by the change in blood flow due to the change in breath or pulse is detected by the sensor unit 110 and the output signal of the sensor unit 110 includes noise. Since the signal is very small, it is amplified by the amplifier 141 and input to the first filter unit 142. The signal input to the first filter unit 142 removes noise through the first filter unit 142, and the analog signal is converted into a digital signal through the analog-digital converter 143.

At this time, the first filter unit 142 is a high pass filter for removing the voltage component of the DC as necessary and a low pass filter (Low Pass) which is a second filter for removing the high frequency that may be generated due to noise By using the filter simultaneously or selectively, it is possible to extract only a signal indicating a change in blood flow due to a change in breath or a change in pulse.

The signal passing through the signal processing circuit 140 is measured and calculated using the height of the signal through the calculation module 150 including a processor having a calculation function.

The measured biosignal is stored in the storage 160. In addition, the storage unit 160 stores a reference biosignal for comparison with the measured biosignal. The reference biosignal may be a general standard value or an arbitrary value desired by the user in consideration of the deviation according to the user.

The lie determination unit 170 compares the measured bio-signal with a reference bio-signal, determines whether the measured bio-signal is out of a predetermined range of the reference bio-signal and determines whether the lie signal generating unit 130 generates an alarm. Deliver the decision signal.

The lie signal generator 130 generates an alarm by light, sound, or vibration through LED lighting, a speaker, or a diaphragm in accordance with a determination signal of whether an alarm is generated from the lie determination unit 170.

In addition, as described above, in the portable lie detector device according to the present invention, the detected biological signal and the reference biological signal stored in the storage unit 160 are blood pressure signals, pulse signals as well as respiration signals and electric skin reflection (current) signals. Can also be used together.

Fig. 2 is a block diagram showing the configuration of the signal processing circuit of the portable lie detector according to the present invention, and the configuration is as discussed above.

3 is a flow chart for explaining the operation of the portable lie detector according to the present invention.

Referring to FIG. 3, the portable lie detector device according to the present invention generates an electrical signal by detecting a bio-signal from light transmitted or reflected by irradiating light onto a human body.

After amplifying the detected biosignal, removing noise, and converting the digital signal into a digital signal (S30), the calculation module measures and calculates a respiratory signal and a pulse signal from the converted biosignal.

Thereafter, the measured respiratory signal and the pulse signal are compared with the reference blood pressure, the respiratory signal and the pulse, and the current signal to determine a lie (S60) to generate a lie alarm signal (S70).

The technical spirit of the present invention has been described above with reference to the accompanying drawings, but the present invention has been described by way of example and is not intended to limit the present invention. In addition, it is obvious that any person having ordinary knowledge in the technical field to which the present invention belongs may make various modifications and imitations without departing from the scope of the technical idea of the present invention.

1 is a block diagram of a portable lie detector device according to the present invention.

Figure 2 is a block diagram showing the configuration of the signal processing circuit of the portable lie detector according to the present invention.

Claims

Sensor unit 110 for detecting a biological signal; A signal processor 120 for determining a lie by comparing the detected biosignal with a reference biosignal; And a lie signal generator 130 generating a lie signal in response to whether the signal processor determines a lie.

The portable polygraph of claim 1, wherein the biosignal is a pulse signal, a respiration signal, a skin electric reflection signal, or a blood pressure signal.

According to claim 1, wherein the sensor unit 110 is a skin electro-reflective sensor (111) for attaching two electrode sensors to a specific portion of the human body to measure the change of the two minute currents; And a PPG sensor (112) comprising a light emitting element for injecting light into a specific part of the human body and a photosensor for detecting light transmitted or reflected from the specific part of the human body to generate an electrical signal. Polygraph

According to claim 1, The signal processing unit 120 includes a calculation module 150 for measuring and calculating the bio-signal in response to the output signal of the sensor unit; A storage unit 160 for storing a reference biosignal and a biosignal measured by the calculation module; A portable lie detector comprising: a lie determination 170 by comparing the reference bio signal and the bio signal measured by the calculation module

The portable polygraph of claim 4, wherein the signal processor 120 further includes a signal processing circuit 140 for processing an output signal of the sensor unit and transmitting the signal to the calculation module.

The signal processing circuit 140 of claim 5, further comprising: an amplifier 141 for amplifying an output signal of the sensor unit; And at least one of a first filter unit 142 for removing noise included in an output signal of the sensor unit.

The portable polygraph of claim 6, wherein the signal processing circuit 140 further comprises an analog-digital converting unit 143 for converting an output signal of the amplifying unit or the first filter unit into a digital signal.

According to claim 1, wherein the lie signal generating unit 130 is a portable lie detector, characterized in that made of a speaker, a diaphragm, LED lighting

The portable polygraph of claim 1, wherein the reference biosignal is arbitrarily determined by a user.