WO2023106138A1 - 生体情報検知装置、それを備えた車両およびベッド、並びに、生体情報検知方法 - Google Patents

生体情報検知装置、それを備えた車両およびベッド、並びに、生体情報検知方法 Download PDF

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Publication number
WO2023106138A1
WO2023106138A1 PCT/JP2022/043603 JP2022043603W WO2023106138A1 WO 2023106138 A1 WO2023106138 A1 WO 2023106138A1 JP 2022043603 W JP2022043603 W JP 2022043603W WO 2023106138 A1 WO2023106138 A1 WO 2023106138A1
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Prior art keywords
displacement signal
human body
reflected
radar device
body surface
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PCT/JP2022/043603
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English (en)
French (fr)
Japanese (ja)
Inventor
諒 齋藤
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Priority to JP2023566240A priority Critical patent/JPWO2023106138A1/ja
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording for evaluating the cardiovascular system, e.g. pulse, heart rate, blood pressure or blood flow
    • A61B5/024—Measuring pulse rate or heart rate
    • A61B5/0245—Measuring pulse rate or heart rate by using sensing means generating electric signals, i.e. ECG signals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/08—Measuring devices for evaluating the respiratory organs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/103—Measuring devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
    • A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
    • B60K28/02—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the driver
    • B60K28/06—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the driver responsive to incapacity of driver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/06—Systems determining position data of a target
    • G01S13/08—Systems for measuring distance only
    • G01S13/32—Systems for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated

Definitions

  • the present invention relates to a biological information detection device for detecting biological signals of a human body, a vehicle and a bed equipped with the same, and a biological information detection method.
  • Patent Document 1 there is one disclosed in Patent Document 1, for example, as this type of biological information detection device.
  • this biometric information detection device two sets of non-contact biosensors for detecting biometric information of a person using electromagnetic waves are provided for a seat on which a person sits.
  • Each set of biosensors is composed of a first sensor and a second sensor that emit electromagnetic waves of different frequencies toward a person, and are arranged side by side.
  • One of the first sensor and the second sensor is used for detecting biological information including noise elements, and the other is used for detecting noise elements.
  • the biometric information of the human body is extracted by taking the difference for the noise element.
  • These sensors are configured by Doppler radar or the like.
  • the conventional biological information detection device disclosed in Patent Document 1 uses the first sensor and the second sensor that irradiate and receive electromagnetic waves with different transmission and reception frequencies as radio wave sensors. For this reason, the conventional biological information detecting device is large in scale and expensive.
  • the present invention was made to solve such problems, a reflecting member made of a material that reflects electromagnetic waves and arranged in contact with the human body; A transmitter that irradiates electromagnetic waves toward the human body and the reflecting member respectively, a receiver that receives the reflected waves that are emitted from the transmitter and are reflected by the human body and the reflecting member, respectively, and is received by the receiver after being reflected by the human body Generated by a displacement signal generating unit that generates a body surface displacement signal of the human body from the reflected wave, generates a member displacement signal of the reflecting member from the reflected wave that is reflected by the reflecting member and received by the receiving unit, and a displacement signal generating unit.
  • a radar device having a biosignal generating unit that separates a member displacement signal from an applied body surface displacement signal, removes or attenuates a noise component superimposed on the body surface displacement signal, and generates a biosignal of the human body;
  • An information detection device was constructed.
  • the present invention provides an electromagnetic wave irradiation step of emitting electromagnetic waves from a transmission unit of a radar device toward each of a reflecting member made of a material that reflects electromagnetic waves and arranged in contact with the human body and the human body, a reflected wave receiving step of receiving the reflected wave emitted by the electromagnetic wave applying step and reflected by the reflecting member and the human body to a receiving unit of the radar device; A body surface displacement signal of the human body is generated from the reflected wave received by the reflected wave receiving step after being reflected by the human body, and a member displacement signal of the reflecting member is generated from the reflected wave received by the reflected wave receiving step after being reflected by the reflecting member.
  • a displacement signal generating step a biosignal generating step of separating the member displacement signal from the body surface displacement signal generated in the displacement signal generating step, removing or attenuating the noise component superimposed on the body surface displacement signal, and generating the biosignal of the human body. , constructed a biometric information detection method.
  • a single radar device irradiates and receives electromagnetic waves to and from the human body and the reflecting member, and acquires a body surface displacement signal of the human body and a member displacement signal of the reflecting member. Then, the member displacement signal is separated from the acquired body surface displacement signal, the noise component superimposed on the body surface displacement signal is removed or attenuated, and the biomedical signal of the human body is generated. Therefore, unlike the conventional system in which a first sensor and a second sensor that emit and receive electromagnetic waves with different frequencies are used as radio wave sensors, noise components can be removed or attenuated by using one radar device as a radio wave sensor. A biological signal of the human body can be obtained. Therefore, it is possible to obtain a highly reliable biological signal of the human body while suppressing an increase in the size of the apparatus and achieving a reduction in the size and cost of the apparatus.
  • the present invention includes a reflecting member made of a material that reflects electromagnetic waves and arranged in contact with the human body, a first radar device; a second radar device as a separate device different from the first radar device, which emits electromagnetic waves in the same frequency band as the first radar device; a displacement signal generator for generating a body surface displacement signal of the human body from a reflected wave received by being reflected by the human body, and generating a member displacement signal of the reflecting member from the reflected wave received by being reflected by the reflecting member; a biosignal generator that separates the member displacement signal from the body surface displacement signal generated by the displacement signal generator, removes or attenuates a noise component superimposed on the body surface displacement signal, and generates a biomedical signal of the human body; , constructed a biological information detection device.
  • the first radar device and the second radar device that irradiate and receive electromagnetic waves in the same frequency band irradiate and receive the electromagnetic waves to and from the human body and the reflecting member, thereby producing a body surface displacement signal of the human body and the reflection of the electromagnetic waves.
  • a member displacement signal of the member is obtained.
  • the member displacement signal is separated from the acquired body surface displacement signal, the noise component superimposed on the body surface displacement signal is removed or attenuated, and the biomedical signal of the human body is generated.
  • a first radar device and a second radar device that irradiate and receive electromagnetic waves in the same frequency band are used.
  • a radio wave sensor By using it as a radio wave sensor, it is possible to obtain biological signals of the human body from which noise components have been removed or attenuated. Therefore, it is possible to obtain a highly reliable biological signal of the human body while suppressing an increase in the size of the apparatus and achieving a reduction in the size and cost of the apparatus.
  • the first radar device and the second radar device can be arranged at arbitrary positions, the electromagnetic waves can be radiated to the human body and the reflecting member from various angles, and the reflected waves from the human body and the reflecting member can be reflected from various angles. can be received, the degree of freedom in arranging the reflecting member increases. Therefore, it is possible to flexibly design the arrangement configuration of the biological information detection device.
  • a reflecting member made of a material that reflects electromagnetic waves and arranged in contact with the human body is irradiated with electromagnetic waves from the reflecting member radar device, and the reflecting member radar device emits electromagnetic waves from the human body radar device toward the human body.
  • an electromagnetic wave irradiation step of irradiating an electromagnetic wave in the same frequency band as the device A reflected wave receiving step of receiving a reflected wave irradiated by the electromagnetic wave irradiation step and reflected by the human body to the human body radar device, and receiving a reflected wave irradiated by the electromagnetic wave irradiation step and reflected by the reflecting member by the reflecting member radar device.
  • a body surface displacement signal of the human body is generated from the reflected wave received by the reflected wave receiving step after being reflected by the human body, and a member displacement signal of the reflecting member is generated from the reflected wave received by the reflected wave receiving step after being reflected by the reflecting member.
  • a displacement signal generating step; a biosignal generating step of separating the member displacement signal from the body surface displacement signal generated in the displacement signal generating step, removing or attenuating the noise component superimposed on the body surface displacement signal, and generating the biosignal of the human body. constructed a biometric information detection method.
  • the human body radar device and the reflecting member radar device that irradiate and receive electromagnetic waves in the same frequency band irradiate and receive the electromagnetic waves to and from the human body and the reflecting member, thereby generating body surface displacement signals of the human body and A member displacement signal of the reflecting member is obtained. Then, the member displacement signal is separated from the acquired body surface displacement signal, the noise component superimposed on the body surface displacement signal is removed or attenuated, and the biomedical signal of the human body is generated.
  • the radar system for the human body and the radar system for reflectors irradiate and receive electromagnetic waves in the same frequency band. is used as a radio wave sensor, a biological signal of the human body with noise components removed or attenuated can be obtained. Therefore, it is possible to obtain a highly reliable biological signal of the human body while suppressing an increase in the size of the apparatus and achieving a reduction in the size and cost of the apparatus.
  • the human body radar device and the reflecting member radar device can be arranged at arbitrary positions, so that the human body and the reflecting member can be irradiated with electromagnetic waves from various angles, and the human body and the reflecting member can be reflected from the human body and the reflecting member at various angles. Since waves can be received, the degree of freedom in arranging the reflecting member increases. Therefore, it is possible to flexibly design the arrangement configuration of the biological information detection device.
  • the present invention includes an electromagnetic wave irradiation step of irradiating an electromagnetic wave from a transmission radar device toward a reflecting member made of a material that reflects electromagnetic waves and arranged in contact with the human body and the human body, a reflected wave receiving step of receiving the reflected wave irradiated by the electromagnetic wave irradiation step and reflected by the human body and the reflected wave reflected by the reflecting member to a reception radar device;
  • a body surface displacement signal of the human body is generated from the reflected wave received by the reflected wave receiving step after being reflected by the human body, and a member displacement signal of the reflecting member is generated from the reflected wave received by the reflected wave receiving step after being reflected by the reflecting member.
  • a displacement signal generating step a biosignal generating step of separating the member displacement signal from the body surface displacement signal generated in the displacement signal generating step, removing or attenuating the noise component superimposed on the body surface displacement signal, and generating the biosignal of the human body. , constructed a biometric information detection method.
  • the transmitting radar device that emits electromagnetic waves and the receiving radar device that receives the reflected waves of the electromagnetic waves emitted by the transmitting radar device are devices of the same frequency band. . Therefore, even with these configurations, the transmitting radar device and the receiving radar device that irradiate and receive electromagnetic waves in the same frequency band irradiate and receive the electromagnetic waves to and from the human body and the reflecting member, producing a body surface displacement signal of the human body. and a member displacement signal of the reflecting member. Then, the member displacement signal is separated from the acquired body surface displacement signal, the noise component superimposed on the body surface displacement signal is removed or attenuated, and the biomedical signal of the human body is generated.
  • a transmitting radar device and a receiving radar device that irradiate and receive electromagnetic waves in the same frequency band are used.
  • a radio wave sensor By using it as a radio wave sensor, it is possible to obtain biological signals of the human body from which noise components have been removed or attenuated. Therefore, it is possible to obtain a highly reliable biological signal of the human body while suppressing an increase in the size of the apparatus and achieving a reduction in the size and cost of the apparatus.
  • the transmitting radar device and the receiving radar device can be arranged at arbitrary positions, the electromagnetic waves can be radiated to the human body and the reflecting member from various angles, and the reflected waves from the human body and the reflecting member can be reflected from various angles. can be received, the degree of freedom in arranging the reflecting member increases. Therefore, it is possible to flexibly design the arrangement configuration of the biological information detection device.
  • the present invention constitutes a vehicle equipped with any one of the biological information detection devices described above.
  • the present invention constitutes a bed equipped with any one of the biological information detection devices described above.
  • a biometric information detection device capable of obtaining a highly reliable biosignal of a human body while suppressing an increase in device size and achieving miniaturization and cost reduction of the device. It is possible to provide a vehicle, a bed, and a biological information detection method.
  • FIG. 1 is a side view showing one usage example when the biological information detection device according to the first embodiment is applied as a driver monitoring system;
  • FIG. 2 is a schematic flow chart diagram showing rough processing of the biometric information detection method according to the first embodiment of the present invention.
  • 5 is a graph showing waveforms of a body surface displacement signal, a reference plane displacement signal, and a biosignal obtained at each part by the biometric information detection device according to the first embodiment;
  • FIG. 1 It is a block diagram which shows schematic structure of the biometric information detection apparatus by the 3rd Embodiment of this invention.
  • (a) is a perspective view showing the interior of a vehicle in which the biological information detection device according to each embodiment is arranged at each location
  • (b) is a hospital where the biological information detection device according to each embodiment is arranged at each location is a perspective view showing the inside of a hospital room.
  • FIG. 1 is a block diagram showing a schematic configuration of a biological information detection device 1 according to a first embodiment of the present invention, and FIG. It is a side view showing an example of use.
  • the biological information detection device 1 is configured with a radar device 2 and a reflecting member 3 .
  • the biological information detection device 1 is installed, for example, inside a seat 5 on which a driver who is a subject 4 in a vehicle sits, as shown in the figure.
  • the radar device 2 is installed in the inner member 5a of the seat 5, as shown by partially enlarging the inside of the dashed frame in FIG.
  • the reflecting member 3 is installed on the back side of the surface 5b of the sheet 5 that contacts the human body of the subject 4, that is, on the side of the inner member 5a.
  • the biological information detection device 1 detects the change in the distance from the radar device 2 to the body surface of the subject 4 where the electromagnetic wave is irradiated as the body surface displacement. Based on this body surface displacement, the biological information detection device 1 detects vital signs such as the heart rate, heart rate variability, respiration rate, and respiration depth of the subject 4 driving the vehicle.
  • the reflecting member 3 is made of a material that reflects the electromagnetic waves irradiated (emitted) from the radar device 2 .
  • the reflecting member 3 is arranged in direct or indirect contact with the human body of the subject 4 .
  • This arrangement of the reflecting member 3 may be arranged on a member that picks up the subject's 4 body movements.
  • the reflecting member 3 is arranged on the back or seat of the seat 5 or the like.
  • the material of the reflecting member 3 preferably has conductivity such as metal foil or conductive fiber and follows the shape change of the human body contact surface.
  • the material is not limited to this, and a hard metal plate or the like may be used as long as the material reflects electromagnetic waves.
  • conductive fiber-reinforced plastic, a member plated with a conductive material, a member coated with a conductive paint, or a member attached with a conductive tape may be used.
  • the radar device 2 is configured as a module having a signal generator 2a, a transmitter 2b, a receiver 2c, an RF (high frequency) signal processor 2d, and an arithmetic device 2e. These units are implemented by software control processing of a microcomputer, by hardware configuration of electronic circuits, or by both software control processing of these microcomputers and hardware configuration of electronic circuits. Generally, the transmitter 2b and the receiver 2c are configured as antennas.
  • the signal generator 2a, the RF signal processor 2d, and the arithmetic device 2e are configured as ICs (integrated circuits).
  • Modulation of electromagnetic waves by the radar device 2 is performed by a Doppler method, a Frequency Modulated Continuous Wave radar (FMCW) method, a pulse modulation method, or the like.
  • FMCW Frequency Modulated Continuous Wave radar
  • pulse modulation method or the like.
  • any method can be used as long as the distance to the target can be measured.
  • the signal generator 2a generates a chirp signal as a transmission signal.
  • the transmission unit 2b has a plurality of transmission antennas Tx that irradiate the human body of the subject 4 and the reflecting member 3 with electromagnetic waves.
  • the transmission unit 2b beam-forms the transmission signals generated by the signal generation unit 2a toward the human body of the subject 4 and the reflecting member 3 from a plurality of transmission antennas Tx and irradiates them as electromagnetic waves.
  • the electromagnetic waves emitted by the transmitter 2b are described as radio waves, but the electromagnetic waves widely include sound waves, light waves, and the like.
  • the receiving unit 2c has a plurality of receiving antennas Rx that receive the reflected waves that strike the human body surface of the subject 4 and the reflected waves that strike the reference surface of the reflecting member 3 and are reflected.
  • the receiving unit 2c receives reflected waves emitted from the transmitting unit 2b and reflected by the human body surface of the subject 4 and the reference surface of the reflecting member 3, respectively, by the plurality of receiving antennas Rx.
  • the RF signal processing unit 2d receives the reflected wave received by each receiving antenna Rx, calculates an IF signal, converts the calculated IF signal into a digital signal with an AD converter, and outputs the digital signal to the arithmetic unit 2e.
  • the computation device 2e has a displacement signal generator 2f, a biosignal generator 2g, and a biometric information calculator 2h.
  • the displacement signal generation unit 2f performs FFT (fast Fourier transform) on the signal input from the RF signal processing unit 2d, and converts the reflected wave received by the receiving unit 2c after hitting the human body surface of the subject 4 into the Generate a body surface displacement signal of the human body. Further, the displacement signal generation unit 2f generates a reference surface displacement signal of the reflection member 3 from the reflected wave that hits the reference surface of the reflection member 3 and is reflected and received by the reception unit 2c. In this specification, since the reflection signal of the reflecting member 3 is used as a reference, the "member displacement signal" of the present invention is called a reference surface displacement signal.
  • FFT fast Fourier transform
  • the biological signal generator 2g separates the reference plane displacement signal from the body surface displacement signal generated by the displacement signal generator 2f by an adaptive filter using an algorithm such as LMS (Least Mean Square). By this separation processing, a minute displacement that does not exist on the reference surface of the reflecting member 3 is extracted as a body surface displacement from the body surface displacement signal of the human body of the subject 4, and the noise component superimposed on the body surface displacement signal is removed or attenuated. be.
  • the biomedical signal generator 2g generates the body surface displacement as a biomedical signal of the human body of the subject 4 .
  • the biometric information calculation unit 2h calculates vital signs such as heart rate, heart rate variability, respiration rate, and respiration depth of the human body of the subject 4 as biometric information from the biosignals generated by the biosignal generation unit 2g.
  • FIG. 3 is a flow chart showing the flow of processing of the biological information detection method according to the first embodiment of the present invention using the biological information detection device 1.
  • FIG. 3 is a flow chart showing the flow of processing of the biological information detection method according to the first embodiment of the present invention using the biological information detection device 1.
  • a human body plane signal acquisition step S101 for acquiring a human body plane signal of the subject 4 is performed.
  • an electromagnetic wave irradiation step of irradiating an electromagnetic wave from the transmission unit 2b toward the human body of the subject 4, and a reflected wave that is irradiated in this electromagnetic wave irradiation step and reflected by the human body surface of the subject 4 is applied to the human body.
  • a reflected wave receiving step is performed to receive the signal as a surface signal in the receiving unit 2c.
  • a reference surface signal acquisition step S102 for acquiring a signal of the reference surface of the reflecting member 3 is performed.
  • This reference plane signal acquisition step S102 is performed at the same time as the human body plane signal acquisition step S101 by switching the electromagnetic wave emitted from the transmitter 2b to the subject 4 and the reflecting member 3 at high speed.
  • an electromagnetic wave irradiation step of irradiating an electromagnetic wave from the transmission unit 2b toward the reflecting member 3, and a reflected wave irradiated in the electromagnetic wave irradiation step and reflected by the reference surface of the reflecting member 3 is applied to the reference surface.
  • a reflected wave receiving step is performed to receive the signal as a signal to the receiving unit 2c.
  • a body surface displacement signal of the human body of the subject 4 is generated, and from the reference surface signal acquired in the reference surface signal acquisition step S102, the A displacement signal generation step S103 for generating a reference surface displacement signal is performed by the displacement signal generator 2f.
  • the graph shown in FIG. 4A is the body surface displacement signal A acquired in the displacement signal generation step S103, and the graph shown in FIG. 4B is the reference surface displacement signal B acquired in the displacement signal generation step S103.
  • the horizontal axis of each graph represents time [sec], and the vertical axis represents the amount of body surface displacement [ ⁇ m] of the subject 4 .
  • the displacement amount of this body surface displacement is expressed with an average value of 0 in a certain time segment.
  • a vibration removal step S104 for removing or attenuating noise components superimposed on the body surface displacement signal is performed by the biological signal generator 2g.
  • the adaptive filter separates the reference plane displacement signal from the body surface displacement signal generated in the displacement signal generating step S103.
  • the biosignal generating step of generating the body surface displacement of the human body of the subject 4 as a biosignal is performed.
  • the graph shown in FIG. 4(c) shows an example of the biosignal C acquired in this biosignal generation step.
  • the horizontal and vertical axes of this graph represent the same as in FIGS. 4(a) and 4(b).
  • the biological signal C includes the vital signs of respiration and heartbeat of the subject 4 .
  • a vital sign acquisition step S105 for acquiring the vital signs of the human body of the subject 4 from the biosignal acquired in the biosignal generation step is performed by the biometric information calculation unit 2h.
  • the signal processing unit 2d and the displacement signal generating unit 2f irradiate and receive electromagnetic waves to and from the human body of the subject 4 and the reflecting member 3, and generate a body surface displacement signal A of the human body of the subject 4 and the reflecting member.
  • 3 reference plane displacement signal B is obtained.
  • the reference plane displacement signal B is separated from the acquired body surface displacement signal A by the adaptive filter by the biosignal generator 2g, the noise component superimposed on the body surface displacement signal A is removed or attenuated, and the biosignal of the human body is obtained.
  • C is generated.
  • noise components can be reduced by using one radar device 2 as a radio wave sensor.
  • a biomedical signal C of the human body that has been removed or attenuated is obtained.
  • the biological information detection device 1 according to the first embodiment while suppressing the expansion of the device scale of the biological information detection device 1 and reducing the size and price of the biological information detection device 1, the reliability A biosignal C of the human body of the subject 4 having a high .
  • the configuration of the transmission unit 2b and the reception unit 2c is a MIMO (Multi Input Multi Output) configuration. That is, the human body of the subject 4 and the reflecting member 3 are irradiated with electromagnetic waves from the plurality of transmitting antennas Tx, and the waves reflected by the body surface of the subject 4 and the reference plane of the reflecting member 3 are reflected by the plurality of receiving antennas Rx. Therefore, according to the biological information detection device 1 according to the first embodiment, the radiation of electromagnetic waves to the human body of the subject 4 and the reflecting member 3 and the human body surface of the subject 4 are more precisely detected. And the reflected wave from the reference surface of the reflecting member 3 can be received. Therefore, the displacement of the body surface of the human body of the subject 4 and the displacement of the reference surface of the reflecting member 3 can be observed more precisely. of biosignals can be obtained.
  • MIMO Multi Input Multi Output
  • the reference plane displacement signal is separated from the body surface displacement signal generated in the displacement signal generation step S103 by the adaptive filter, and the body surface displacement signal is generated by the biosignal generation unit 2g.
  • the noise vibration removal method instead of the adaptive filter, it is possible to use a deep learning model used for speech separation (for example, Demucs, Sepformer, Conv-TasNet, etc.) or a modified machine learning method. good.
  • the reference plane displacement signal is separated from the body surface displacement signal generated in the displacement signal generation step S103 by a machine learning method, and the noise component superimposed on the body surface displacement signal by the biosignal generation unit 2g. remove or attenuate
  • the same effects as those of the above-described embodiment can be obtained, and the biometric signal C of the human body of the subject 4 can be obtained with high reliability while the biometric information detection device 1 can be made smaller and less expensive. can be done.
  • the transmitting section 2b may be configured with a plurality of transmitting antennas Tx.
  • the radiation direction is changed by analog beam forming, and electromagnetic waves are simultaneously transmitted to both the human body of the subject 4 and the reflecting member 3. Irradiated from 2b. Therefore, one radar device 2 can irradiate both the human body of the subject 4 and the reflecting member 3 with electromagnetic waves to simultaneously observe the body surface displacement of the human body of the subject 4 and the reference plane displacement of the reflecting member 3 . .
  • the receiving unit 2c may be configured with a plurality of receiving antennas Rx.
  • the receiving unit 2 c of one radar device 2 receives the reflected waves that strike the human body surface of the subject 4 and the reflected waves that strike the reference surface of the reflecting member 3 .
  • the receiving directions (incident directions) of the reflected waves respectively received by the plurality of receiving antennas Rx are changed by digital beam forming, and the reflected waves are detected from both the human body surface of the subject 4 and the reference surface of the reflecting member 3. are simultaneously acquired by the receiver 2c. Therefore, one radar device 2 receives reflected waves from both the human body surface of the subject 4 and the reference surface of the reflecting member 3, and calculates the body surface displacement of the subject 4 and the reference surface displacement of the reflecting member 3. can be observed simultaneously.
  • one radar device 2 can be used as a radio wave sensor. By using it, a biomedical signal of the human body with noise components removed or attenuated can be obtained. Therefore, in these cases as well, the same effects as those of the above-described embodiments can be obtained, and a highly reliable biosignal C of the human body of the subject 4 can be obtained while the biometric information detection device 1 can be made smaller and less expensive. be able to.
  • FIG. 5 is a block diagram showing the configuration of a biological information detection device 1A according to the second embodiment of the present invention.
  • a biological information detection device 1A includes a reflecting member 3, a first radar device 21, a second radar device 22, and an arithmetic device 23, each of which is provided inside a seat 5. .
  • the first radar device 21 is, for example, a human body radar device.
  • the first radar device 21 irradiates the human body of the subject 4 with electromagnetic waves, and receives reflected waves that hit the human body surface of the subject 4 and are reflected.
  • the first radar device 21 has an RF signal processor 21a and a body surface displacement signal generator 21b therein.
  • the RF signal processing unit 21a receives the reflected wave received by the first radar device 21, calculates an IF signal, and converts the IF signal into a digital human face signal using an AD converter.
  • the body surface displacement signal generator 21 b generates a body surface displacement signal of the human body of the subject 4 from the body surface signal obtained from the reflected wave received by the first radar device 21 .
  • the second radar device 22 is, for example, a reflector radar device.
  • the second radar device 22 irradiates the reflecting member 3 with an electromagnetic wave in the same frequency band as that of the first radar device 21, and emits a reflected wave that strikes the reference surface of the reflecting member 3. receive.
  • the second radar device 22 has an RF signal processor 22a and a reference plane displacement signal generator 22b therein.
  • the RF signal processing unit 22a receives the reflected wave received by the second radar device 22, calculates an IF signal, and converts the IF signal into a digital reference surface signal by an AD converter.
  • the reference plane displacement signal generator 22 b generates a reference plane displacement signal of the reflecting member 3 from the reference plane signal obtained from the reflected wave received by the second radar device 22 .
  • the computing device 23 has a biomedical signal generator 23a and a biomedical information calculator 23b.
  • the biological signal generator 23a separates the reference plane displacement signal generated by the reference plane displacement signal generator 22b from the body surface displacement signal generated by the body surface displacement signal generator 21b.
  • the biomedical signal generator 23a removes or attenuates the noise component superimposed on the body surface displacement signal to generate a biomedical signal of the human body of the subject 4 .
  • the biological information calculation unit 23b calculates a vital sign such as the heart rate of the human body of the subject 4 as biological information from the biological signal generated by the biological signal generation unit 23a.
  • the removal of noise components superimposed on the body surface displacement signal, which is performed in the biological signal generation unit 23a, is performed, for example, by any of the following.
  • the biological signal generator 23a subtracts the reference plane displacement signal generated by the reference plane displacement signal generator 22b from the body surface displacement signal generated by the body surface displacement signal generator 21b. This subtraction separates the reference plane displacement signal from the body surface displacement signal and removes or attenuates the noise component superimposed on the body surface displacement signal.
  • the reference plane displacement signal generated by the reference plane displacement signal generator 22b is separated from the body surface displacement signal generated by the body surface displacement signal generator 21b by the adaptive filter in the biological signal generator 23a. do. This separation removes or attenuates the noise component superimposed on the body surface displacement signal.
  • the reference plane displacement signal generated by the reference plane displacement signal generation unit 22b is generated by the biosignal generation unit 23a by machine learning. To separate. This separation removes or attenuates the noise component superimposed on the body surface displacement signal.
  • the processing of the biological information detection method according to the second embodiment of the present invention using the biological information detection device 1A according to the second embodiment is performed as follows.
  • an electromagnetic wave irradiation step of irradiating electromagnetic waves from the second radar device 22 toward the reflecting member 3 and irradiating electromagnetic waves from the first radar device 21 toward the human body of the subject 4 is performed.
  • the first radar device 21 receives the reflected wave irradiated by the electromagnetic wave irradiation step and reflected by hitting the human body surface of the subject 4, and the reflected wave irradiated by the electromagnetic wave irradiation step and reflected by the reference surface of the reflecting member 3 is received.
  • a step of receiving a reflected wave to be received by the second radar device 22 is performed.
  • a body surface displacement signal of the human body of the subject 4 is generated from the reflected wave reflected by the human body surface of the subject 4 and received in the reflected wave receiving step, and is reflected by the reference surface of the reflecting member 3 and reflected wave receiving step.
  • a displacement signal generation step is performed to generate a reference surface displacement signal of the reflecting member 3 from the reflected wave received in .
  • the reference plane displacement signal is separated from the body surface displacement signal generated in the displacement signal generation step by any of the above noise component removal methods, and the noise component superimposed on the body surface displacement signal is removed or attenuated.
  • a bio-signal generating step of generating a bio-signal of the human body of the subject 4 is performed.
  • a vital sign acquisition step of acquiring the vital signs of the human body of the subject 4 from the biosignals acquired in the biosignal generation step is performed by the biometric information calculation unit 23b.
  • the first radar device 21 and the second radar device 22 that irradiate and receive electromagnetic waves in the same frequency band , the human body of the subject 4 and the reflecting member 3 are irradiated with and received by electromagnetic waves, and a body surface displacement signal of the human body of the subject 4 and a reference plane displacement signal of the reflecting member 3 are obtained.
  • the reference plane displacement signal is separated from the acquired body surface displacement signal, and the noise component superimposed on the body surface displacement signal is removed or attenuated.
  • noise components superimposed on the body surface displacement signal are removed or attenuated.
  • a biological signal of the human body of the subject 4 is generated from the body surface displacement signal from which the noise component has been removed or attenuated.
  • the first radar device 21 and the first radar device 21 that irradiate and receive electromagnetic waves in the same frequency band 2 By using the radar device 22 as a radio wave sensor, a biological signal of the human body of the subject 4 from which noise components have been removed or attenuated can be obtained. Therefore, according to the biological information detection device 1A and the biological information detection method according to the second embodiment, the expansion of the device scale of the biological information detection device 1A is suppressed, and the size and price of the biological information detection device 1A are reduced. It is possible to obtain biosignals of the human body of the subject 4 with high reliability.
  • the first radar device 21 and the second radar device 22 can be arranged at arbitrary positions, respectively, so that the human body of the subject 4 and the reflecting member 3 can be irradiated with electromagnetic waves from various angles. Reflected waves from the human body surface and the reference surface of the reflecting member 3 can be received. Therefore, the arrangement configuration of the biological information detection device 1A can be designed flexibly.
  • the body surface displacement signal generation unit 21b for generating the body surface displacement signal of the human body of the subject 4 is incorporated in the human body radar device 21.
  • one displacement signal generation unit is provided inside the arithmetic unit 23, and the one displacement signal generation unit generates a body surface displacement signal of the human body of the subject 4. may be generated to generate a reference surface displacement signal of the reflecting member 3 .
  • FIG. 6 is a block diagram showing the configuration of a biological information detection device 1B according to the third embodiment of the present invention.
  • a biological information detection device 1B includes a reflecting member 3, a first radar device 31, a second radar device 32, and an arithmetic device 33, which are provided inside the seat 5. .
  • the first radar device 31 is, for example, a transmitting radar device.
  • the first radar device 31 irradiates electromagnetic waves toward the human body of the subject 4 and the reflecting member 3 .
  • the second radar device 32 is, for example, a receiving radar device.
  • the second radar device 32 receives a reflected wave of the electromagnetic wave emitted from the first radar device 31 that hits the human body surface of the subject 4 and the reference surface of the reflecting member 3 and is reflected.
  • the second radar device 32 has an RF signal processing section 32a therein.
  • the RF signal processing unit 32a inputs the reflected waves received by the receiving radar device 32 from the human body surface of the subject 4 and the reference surface of the reflecting member 3 respectively, calculates the IF signal, and converts the calculated IF signal into an AD signal.
  • the converter converts it into a digital human body plane signal and a reference plane signal.
  • the computing device 33 inputs the human body plane signal and the reference plane signal to the displacement signal generator 33a. Then, the displacement signal generator 33a generates a body surface displacement signal of the human body of the subject 4 from the body surface signal obtained by the reflected wave received by the receiving radar device 32 after hitting the human body surface of the subject 4. do. Further, the reference surface displacement signal of the reflecting member 3 is generated from the reference surface signal obtained by the reflected wave received by the receiving radar device 32 after being reflected by the reference surface of the reflecting member 3 .
  • the biological signal generator 33b separates the reference plane displacement signal from the body surface displacement signal generated by the displacement signal generator 33a.
  • the biological signal generator 33b removes or attenuates the noise component superimposed on the body surface displacement signal to generate a biological signal of the human body of the subject 4 .
  • the removal of noise components superimposed on the body surface displacement signal which is performed in the biological signal generation unit 33b, is also performed in the same manner as in the biological information detection device 1A according to the second embodiment. That is, the biological signal generator 33b subtracts the reference plane displacement signal generated by the displacement signal generator 33a from the body surface displacement signal generated by the displacement signal generator 33a. Alternatively, by separating the reference plane displacement signal generated by the displacement signal generation unit 33a from the body surface displacement signal generated by the displacement signal generation unit 33a by an adaptive filter or a machine learning method in the biological signal generation unit 33b, done.
  • the biological information calculation unit 33c calculates the vital signs such as the heart rate of the human body of the subject 4 as biological information from the biological signal generated by the biological signal generation unit 33b.
  • the processing of the biological information detection method according to the third embodiment of the present invention using the biological information detection device 1B according to the third embodiment is performed as follows.
  • an electromagnetic wave irradiation step of irradiating electromagnetic waves from the first radar device 31 toward the reflecting member 3 and the human body of the subject 4 is performed.
  • a reflected wave receiving step is performed in which the second radar device 32 receives the reflected wave irradiated in the electromagnetic wave irradiation step and reflected by the human body of the subject 4 and the reflected wave reflected by the reference surface of the reflecting member 3 .
  • a body surface displacement signal of the human body of the subject 4 is generated from the reflected wave received in the reflected wave receiving step after being reflected by the human body of the subject 4, reflected by the reference surface of the reflecting member 3, and the reflected wave is received.
  • a displacement signal generation step of generating a reference surface displacement signal of the reflecting member 3 from the reflected wave received in the step is performed by the displacement signal generation unit 33a.
  • the reference plane displacement signal is separated from the body surface displacement signal generated in the displacement signal generation step, noise components superimposed on the body surface displacement signal are removed or attenuated, and a biosignal of the human body is generated.
  • a step is performed by the biological signal generator 33b.
  • a vital sign acquisition step of acquiring the vital signs of the human body of the subject 4 from the biosignals acquired in the biosignal generation step is performed by the biometric information calculation unit 33c.
  • the first radar device 31 that emits electromagnetic waves and the reflected waves of the electromagnetic waves emitted by the first radar device 31 are received.
  • the second radar device 32 is composed of devices of the same frequency band. Therefore, even with the biological information detection device 1B and the biological information detection method according to the third embodiment, the first radar device 31 and the second radar device 32 that irradiate and receive electromagnetic waves in the same frequency band detect the human body of the subject 4 and the reflected light. Electromagnetic waves are applied to and received from the member 3, and a body surface displacement signal of the human body of the subject 4 and a reference plane displacement signal of the reflecting member 3 are acquired. Then, the reference plane displacement signal is separated from the acquired body surface displacement signal, the noise component superimposed on the body surface displacement signal is removed or attenuated, and the biological signal of the human body of the subject 4 is generated.
  • the first radar device 31 and the first radar device 31 that irradiate and receive electromagnetic waves in the same frequency band 2 By using the radar device 32 as a radio wave sensor, a biological signal of the human body of the subject 4 from which noise components have been removed or attenuated can be obtained. Therefore, even with the biological information detection device 1B and the biological information detection method according to the third embodiment, expansion of the device scale of the biological information detection device 1B is suppressed, and the size and cost of the biological information detection device 1B are reduced. However, it is possible to obtain highly reliable biological signals of the human body of the subject 4 .
  • the first radar device 31 and the second radar device 32 can be arranged at arbitrary positions, respectively, so that the human body of the subject 4 and the reflecting member 3 can be irradiated with electromagnetic waves from various angles. Reflected waves from the human body surface and the reference surface of the reflecting member 3 can be received. Therefore, the arrangement configuration of the biological information detection device 1B can be designed flexibly.
  • the reflective member 3 is arranged between the body of the subject 4 and the radar device 2 and is a member that picks up the body movement of the human body, and the radar device 2 is positioned between the body of the subject 4 and the reflective member 3. It may be arranged so that electromagnetic waves can be applied to both sides and reflected waves from both the human body and the reflecting member 3 can be received.
  • the radar device 2 may be arranged on the dashboard 42 , the room mirror 43 , the ceiling 44 of the vehicle interior, or the like, and the reflecting member 3 may be arranged on the seat belt 45 .
  • the first radar device 21, the second radar device 22, and the reflecting member 3 are arranged inside the sheet 41 .
  • the reflecting member 3 is arranged between the human body of the subject 4 and the second radar device 22 and is a member that picks up the body movement of the human body
  • the second radar device 22 is arranged at a location where it can irradiate electromagnetic waves and receive reflected waves from the human body, and at a location where it can irradiate electromagnetic waves to the reflecting member 3 and receive reflected waves from the reflecting member 3.
  • the first radar device 21 may be arranged on the dashboard 42
  • the second radar device 22 may be arranged on the rearview mirror 43
  • the reflecting member 3 may be arranged on the seat belt 45 .
  • the reflecting member 3 is arranged between the human body of the subject 4 and the first radar device 31, and is arranged in a member that picks up the body movement of the human body
  • the second radar device 32 is arranged between the human body and the first radar device 31. It may be arranged so as to be arranged at a position where the reflected wave from the reflecting member 3 can be received.
  • the first radar device 31 may be arranged on the dashboard 42
  • the second radar device 32 may be arranged on the rearview mirror 43
  • the reflecting member 3 may be arranged on the seat belt 45 .
  • the biometric information detection devices 1, 1A, and 1B are miniaturized and reduced in price by suppressing an increase in device scale, and reliability is high. It is possible to provide a vehicle 40 equipped with the biological information detectors 1, 1A and 1B that can obtain the biological signals of the human body.
  • the radar device 2 and the reflecting member 3 are arranged inside the mattress of the bed 51 in the medical facility, like the hospital room shown in FIG. 7(b). may be configured to be In this case as well, the biological information detecting device 1 has the reflecting member 3 arranged between the body of the subject and the radar device 2 to pick up the body movement of the human body. and can receive reflected waves from both the human body and the reflecting member 3 .
  • the radar device 2 may be arranged on a wall 52 of a hospital room, a ceiling 53, a chair 54, a lighting 55, etc.
  • the reflecting member 3 may be arranged on a blanket (not shown) covering the subject. good.
  • the biological information detection device 1A of the second embodiment may also be configured such that the first radar device 21, the second radar device 22, and the reflecting member 3 are arranged inside the mattress of the bed 51. .
  • the reflecting member 3 is arranged between the human body of the subject and the second radar device 22 to pick up the body movement of the human body, and the first radar device 21 detects the body movement of the human body. so that the second radar device 22 can irradiate the electromagnetic wave to the reflecting member 3 and receive the reflected wave from the reflecting member 3, and can receive the reflected wave from the human body.
  • the first radar device 21 is arranged on the wall 52 or the ceiling 53
  • the second radar device 22 is arranged on the chair 54 or the lighting 55
  • the reflecting member 3 is arranged on a blanket (not shown) covering the subject. good too.
  • the biological information detection device 1B of the third embodiment may also be configured such that the first radar device 31, the second radar device 32, and the reflecting member 3 are arranged inside the mattress of the bed 51.
  • the reflecting member 3 is arranged between the human body of the subject and the first radar device 31 to pick up the body movement of the human body. and the reflecting member 3 can be irradiated with electromagnetic waves, and the second radar device 32 can be arranged at a location where it can receive reflected waves from the human body and the reflecting member 3 .
  • the first radar device 31 is arranged on the wall 52 or the ceiling 53 of the hospital room
  • the second radar device 32 is arranged on the chair 54 or the lighting 55
  • the reflecting member 3 is arranged on a blanket (not shown) covering the subject. It may be configured as
  • the biometric information detection devices 1, 1A, and 1B are miniaturized and reduced in price by suppressing an increase in device scale, and reliability is high. It is possible to provide a bed 51 equipped with the biological information detectors 1, 1A, and 1B capable of obtaining biological signals of the human body. Further, by arranging the biological information detecting devices 1, 1A and 1B in a hospital room as described above, the vital signs of patients can be detected and applied to watch over the patients.
  • Reference Signs List 1 1A, 1B biological information detection device 2 radar device 2a signal generator 2b transmitter 2c receiver 2d, 21a, 22a RF signal processor 2e arithmetic device 2f, 21b, 22b, 33a displacement Signal generator 2g, 23a, 33b Biological signal generator 2h, 23b, 33c Biological information calculator 3
  • Reflective member 4 Test subject 5 Sheet 5a Internal member of sheet 5 5b Surface of sheet 5 21 First Radar system (Human body radar system) 22 . . . Second radar device (reflecting member radar device) 31... First radar device (transmitting radar device) 32... Second radar device (receiving radar device) 40... vehicle 51... bed

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KR20170071247A (ko) * 2015-12-15 2017-06-23 현대자동차주식회사 생체 측정 장치 및 그 제어방법
JP2019180451A (ja) * 2018-04-02 2019-10-24 テイ・エス テック株式会社 生体センサーの配置構造及びシート

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KR20170071247A (ko) * 2015-12-15 2017-06-23 현대자동차주식회사 생체 측정 장치 및 그 제어방법
JP2019180451A (ja) * 2018-04-02 2019-10-24 テイ・エス テック株式会社 生体センサーの配置構造及びシート

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JP7831427B2 (ja) 2023-07-18 2026-03-17 株式会社村田製作所 生体情報取得装置、及び生体情報取得方法

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