JP6905920B2 - Biometric information detector and control method of biometric information detector - Google Patents

Description

The present invention relates to a biometric information detection device and a control method for the biometric information detection device.

A support system for the elderly, such as monitoring the daily activity status and health status of the elderly living alone and notifying their families when it is determined that an abnormality has occurred, is being considered. This type of system uses a safety monitoring device that uses a microwave sensor to detect the body movements, heartbeat (corresponding to pulse waves), and respiration of the elderly subject (corresponding to the subject). It has been proposed (for example, Patent Document 1).
In Patent Document 1, the body is used to specify the approximate distance between the microwave sensor and the subject based on the body movement rate, heart rate, and respiratory rate, and to specify the safety according to the distance. It is described that the threshold value set for the respiration rate is changed.

Japanese Unexamined Patent Publication No. 2013-97670

By using a microwave sensor capable of detecting a plurality of types of biological information, it is possible to efficiently detect a plurality of types of biological information (body movement, respiration and pulse wave) of a subject.
However, the accuracy of body movement, respiration, and pulse wave detection by the microwave sensor varies depending on the distance to the subject. Therefore, in the case of the configuration of Patent Document 1, there is a restriction that the state of the living body cannot be determined with high accuracy from the respiration and the pulse wave, and the error of the distance specified from the respiration and the pulse wave becomes large, and the error of the distance specified from the respiration and the pulse wave becomes large. There is a risk that the determination accuracy of
Therefore, an object of the present invention is to facilitate improving the accuracy of determining the state of a living body while using a sensor capable of detecting a plurality of types of biological information.

In order to achieve the above object, the biological information detection device of the present invention is information capable of specifying a plurality of types of biological information regarding a living body to be measured, and can also specify a distance to the living body. A sensor capable of detecting information and the distance are specified by using the sensor, bioinformation is selected from the plurality of types of biometric information according to the specified distance, and the biometric information is based on the selected biometric information. It is characterized by including an information processing unit for determining the state of the living body.

In the above configuration, the sensor detects information corresponding to the movement of the living body as the plurality of types of biological information, and the information processing unit uses the longer the specified distance as the biological information of the specific target. Biological information on the side having a large amplitude corresponding to movement may be preferentially selected.

Further, in the above configuration, the plurality of types of biological information include any one or more of the body movement, respiration, and pulse of the living body, and the information processing unit determines that the distance is suitable for detecting the pulse. If it exceeds, at least one of the respiration and the body movement including the range having a larger amplitude than the pulse is selected, and if it exceeds the distance suitable for detecting the respiration, the range having a larger amplitude than the respiration is selected. The body movement including may be selected.

Further, in the above configuration, when the biometric information of a plurality of living organisms is acquired by using the sensor, the information processing unit executes a specific process for identifying a biological body to be measured, and specifies the specific process. Based on the result, the biological information of the living body to be measured may be specified.

Further, in the above configuration, the specific process is at least one of a process of specifying the position of the living body to be measured and a process of detecting the existence of the living body at a position where the living body to be measured is likely to exist. But it may be.

Further, in the above configuration, the information processing unit identifies the biological information of the living body to be measured, compares the biological information with the past biological information of the living body to be measured, and responds according to the comparison result. , The process of determining the state of the living body may be selectively executed.
Further, in the above configuration, the sensor may be a microwave sensor.

Further, the present invention uses a sensor capable of identifying a plurality of types of biological information regarding a living body to be measured and information capable of specifying a distance from the living body, and the information. A control method for a biometric information detection device including an information processing unit for processing, wherein the distance is specified by using the sensor, and biometric information is selected from a plurality of types of biometric information according to the specified distance. Is selected, and the state of the living body is determined based on the selected biometric information.

According to the present invention, it becomes easy to improve the accuracy of determining the state of a living body while using a sensor capable of detecting a plurality of types of biological information.

It is a block diagram of the biological information detection device which concerns on 1st Embodiment. It is a figure which shows the judgment table. It is a flowchart which shows the operation of a biological information detection device. It is a figure which shows the biological information detection device together with the living room of the measurement subject. It is a block diagram of the biological information detection device which concerns on 2nd Embodiment. It is a block diagram of the biological information detection device which concerns on 3rd Embodiment. It is a block diagram of the biological information detection device which concerns on 4th Embodiment. It is a figure which shows the biological information detection apparatus which concerns on 5th Embodiment together with the living room of the measurement subject. It is a flowchart which shows the operation of a biological information detection device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 is a block diagram of the biological information detection device 10 according to the first embodiment.
The biological information detection device 10 is a device that detects the biological information of the measurement target person 2 (corresponding to the subject and the watching target person) and determines the state of the measurement target person 2 based on the detected biological information. In the present embodiment, the measurement target person 2 is an elderly person. The measurement target person 2 is not limited to the elderly, and may be a living body other than a human being.
As shown in FIG. 1, the biological information detection device 10 emits a microwave, which is a kind of radio wave, and detects a microwave sensor 11 (also referred to as a microwave Doppler sensor) reflected from the measurement target person 2. I have. The biological information detection device 10 includes an information processing unit 21 that detects the biological information of the measurement target person 2 by processing the information detected by the microwave sensor 11.

The microwave sensor 11 includes a microwave transmitter that emits microwaves, a microwave receiver that receives reflected waves of microwaves, and a microwave demodulator, and outputs an analog signal indicating a sensor detection result from the microwave demodulator. Output. The analog signal output is band-limited and converted into a digital signal by the signal processing unit 12 and the AD conversion unit 13. The signal processing unit 12 includes an amplifier that amplifies the input signal, a filter that extracts a frequency band required for subsequent processing, and the like. Further, in the microwave sensor 11, the emission timing and the like are controlled by the sensor control unit 14.

For example, a microwave transmitter emits microwaves having a frequency of about 24 [GHz]. A part of the microwave is reflected on the body surface of the measurement target 2, and the other part is reflected by the respiratory muscles, myocardium, etc. of the measurement target 2, and is received by the microwave receiver. The frequency is not limited to 24 [GHz].
Due to the Doppler effect, the frequency of the reflected wave changes according to the movement (including vibration) of a plurality of parts of the measurement target person 2. Therefore, the reflected wave is a reflected wave (corresponding to a body motion wave) corresponding to the movement (body movement) of a relatively large part such as the limbs of the measurement target person 2, and a respiratory movement of the respiratory muscles of the measurement target person 2. The reflected wave (breathing wave) corresponding to the above, and the reflected wave (pulse wave) corresponding to the movement (pulsation) of the pulsating portion such as the myocardium of the measurement subject 2 are included.

The microwave receiver receives the reflected microwave and outputs an output signal indicating the received microwave. The microwave demodulator outputs a microwave Doppler shift signal based on the signal indicating the microwave input from the microwave transmitter and the output signal of the microwave receiver. The microwave Doppler shift signal is a signal including a body motion wave, a respiratory wave, and a pulse wave. In the present embodiment, the information processing unit 21 has a function of detecting three types of biological information including body movement, respiration, and pulse (also referred to as pulsation and pulse) from a microwave Doppler shift signal.

Further, a distance measurement technique for measuring the distance of an object using microwaves is known, and examples thereof include a pulse Doppler method and an FMCW method. In this configuration, the information processing unit 21 also has a function of detecting the distance to the measurement target person 2 based on the signal from the microwave sensor 11.

That is, in the present embodiment, the microwave sensor 11 is information that can specify the body movement, respiration, and pulse of the measurement target person 2, and information that can specify the distance to the measurement target person 2. It is used as a sensor to detect the reflected wave. Therefore, it is possible to efficiently identify a large number of information (body movement, respiration, pulse, and distance) with one type of sensor, and it becomes easier to simplify and miniaturize the configuration as compared with the case of using a large number of sensors.

The information processing unit 21 is composed of a digital processing circuit (for example, DSP), and FIG. 1 shows a functional configuration. Each part of the information processing unit 21 may be composed of either software or hardware.
As shown in FIG. 1, the information processing unit 21 acquires information necessary for detecting distance and biological information (body movement, respiration, and pulse) from a digital signal output from the AD conversion unit 13. It has a part 22. The information acquisition unit 22 identifies and extracts data in each frequency band of distance, body movement, respiration, and pulse by performing, for example, filtering and fast Fourier transform (FFT). Each of the acquired data is output to each of the distance detection unit 23, the body movement detection unit 24, the respiration detection unit 25, and the pulse detection unit 26, which will be described later.

The distance detection unit 23 detects the distance between the measurement target person 2 and the biological information detection device 10 by using a known distance measurement method such as a pulse Doppler method. The detection result of the distance detection unit 23 is output to the state determination unit 27 and the determination unit 28 in the information processing unit 21.
The body movement detection unit 24 detects the number of body movements, which is the number of times the body is moved per unit time based on the body movement wave. The respiration detection unit 25 detects the respiration rate, which is the number of respirations per unit time, based on the respiration wave. Further, the pulse detection unit 26 detects the pulse rate (also referred to as the pulsation number), which is the number of pulses per unit time, based on the pulse wave. As a method for detecting body movement, respiration, and pulse, a known method can be widely applied.

In general, breathing is a larger movement than pulsation, and body movement is a larger movement than breathing. This difference in the amount of movement results in the longest detectable distance of body movement in body movement, respiration, and pulse. The detectable distance is a distance that can be detected with sufficient accuracy.

In this configuration, the determination unit 28 selects biometric information that can be detected with high accuracy from a plurality of biometric information according to the distance between the measurement target person 2 and the microwave sensor 11, and uses this determination result. A selection process for controlling the switching unit 29 is performed accordingly.
Under the instruction of the determination unit 28, the switching unit 29 switches whether to output the detection result of any of the body movement detection unit 24, the respiration detection unit 25, and the pulse detection unit 26 to the state determination unit 27. Perform processing. Therefore, only the biological information selected by the determination unit 28 is output to the state determination unit 27.

The determination unit 28 selects biological information that can be detected with high accuracy according to the distance by referring to the determination table 28T shown in FIG. This judgment table 28T selects body movement, respiration, and pulse when the distance is a short distance from the value 0 to less than the value Y, and when the distance is a medium distance from the value Y to less than the value Z, the body movement, And breathing are selected, and when the distance is a long distance exceeding the value Z, the body movement is selected. That is, in the judgment table 28T, the longer the distance, the more preferentially the biological information on the side with the larger amplitude (body movement, respiration, etc., and in the present embodiment, the biological information on the lower frequency side) is selected. Information.
The value Y is set to the lower limit of the distance suitable for detecting respiration (and body movement), which is not suitable for detecting pulse, and the value Z is the distance suitable for detecting body movement, which is not suitable for detecting respiration. Set to the lower limit. The values Y and Z may be changed as appropriate.

The state determination unit 27 determines the state of the measurement target person 2 (for example, whether it is healthy or not, whether there is any abnormality, etc.) based on the biological information input to the state determination unit 27. The determination result of the state determination unit 27 can be notified to the caregiver or the like of the measurement target person 2 by a notification device (not shown), and at least when the state of the measurement target person 2 is in a state to be notified, that fact is notified. NS. As the notification device, a configuration having a known notification function can be widely applied.

FIG. 3 is a flowchart showing the operation of the biological information detection device 10. Each part of the biological information detection device 10 is centrally controlled by the information processing unit 21.
First, the biological information detection device 10 emits microwaves from the microwave sensor 11 by the sensor control unit 14 (step S1), and causes the microwave sensor 11 to receive the Doppler-shifted reflected wave from the measurement target person 2 (step S1). Step S2).

Next, the biological information detection device 10 extracts data in each frequency band of distance and biological information (body movement, respiration, and pulse) by the information acquisition unit 22 of the information processing unit 21 (step S3). Then, the biological information detection device 10 detects the distance and the biological information (body movement, respiration, and pulse) by the distance detection unit 23, the body movement detection unit 24, the respiration detection unit 25, and the pulse detection unit 26. (Step S4).

Since the biological information detection device 10 continuously monitors the state of the measurement target person 2, the emission of microwaves is continued, and the detection of distance and biological information (body movement, respiration, and pulse) is also continued. Will be done. Further, from the viewpoint of monitoring the health of the elderly, it is preferable to detect the distance and biological information (body movement, respiration, and pulse) in almost real time.

The biological information detection device 10 determines whether or not the measurement target person 2 exists in the detection range based on the detection result of the distance detection unit 23 (“there is a measurement target person in the detection range” in FIG. 3). (Step S5). For example, when the distance cannot be detected, it is determined that the measurement target person 2 does not exist within the detection range. When the measurement target person 2 does not exist within the detection range (step S5; NO), the biological information detection device 10 does not move to the next process such as step S6, and temporarily ends the process. The process of step S5 may be a process in which the measurement target person 2 itself or the caregiver of the measurement target person 2 notifies the biological information detection device 10 that the measurement target person 2 is within the detection range.

When the measurement target person 2 is within the detection range (step S5; YES), the biological information detection device 10 moves according to the distance detected by the distance detection unit 23 by the determination unit 28 and the switching unit 29. One of the biological information in breathing and pulse is selected (step S6), and the selected biological information is input to the state determination unit 27. When the biometric information is input, the state determination unit 27 determines the state of the measurement target person 2 based on the biometric information (step S7).

By the above operation, the biometric information selected according to the detected distance is continuously input to the state determination unit 27. For example, if the detected distance does not change, the same biometric information is continuously input to the state determination unit 27. If the detected distance changes, the biometric information selected according to the changed distance is input. As a result, the state determination unit 27 can continuously determine the state of the measurement target person 2 based on highly accurate biological information.
If the selected biometric information cannot be detected, it is preferable to start over from the detection of the distance or the determination of the presence or absence of the measurement target person.

FIG. 4 shows a configuration example when the biological information detection device 10 is used for watching over the measurement target person 2 in the living room 50 (determining the state of health, safety, etc.).
The living room 50 is a room in which the measurement target person 2 resides, and is, for example, a room in the nursing care facility used by the measurement target person 2 or a bedroom in the measurement target person 2's home. There is a bed 51 in the living room 50, and there is an entrance 53 and the like in the living room 50.
The microwave sensor 11 is arranged close to the bed 51 and can detect the biological information of the measurement target person 2 on the bed 51. Further, in FIG. 4, the region from the microwave sensor 11 to the boundary indicated by reference numeral K1 is a range in which the pulse can be detected with sufficient accuracy, and the region up to the boundary indicated by reference numeral K2 is a range in which breathing is performed with sufficient accuracy. It is a detectable range. In addition, the entire interior of the living room 50 is within a range in which body movement can be sufficiently detected.

When the measurement target person 2 is at the position marked with the symbol A (outside the boundary K2), the biological information detection device 10 is the living body corresponding to the body movement among the body movement, respiration, and pulse in the above step S6. Information is selected, and the selected biological information is input to the state determination unit 27.
In this case, in step S7, the state determination unit 27 monitors the measurement target person 2 based on the biological information corresponding to the body movement that can be detected with sufficient accuracy. Specifically, based on the body movement, the presence / absence detection of whether or not the measurement target person 2 is in the living room 50 is performed, and the detection result is reported to the caregiver of the measurement target person 2 by a notification device (not shown). Etc. will be notified. It is preferable to consider time for this monitoring. For example, in the case of bedtime, when the measurement target person 2 stays at this position (outside the boundary K2) for a long time, it is preferable to notify the occurrence of an abnormality in order to promote bedtime.

When the measurement target person 2 is at the position marked with the symbol B (between the boundary K1 and the boundary K2), the biological information detection device 10 performs the body movement and the body movement among the body movement, respiration, and pulse in the above step S6. The biological information of respiration is selected, and the selected biological information is input to the state determination unit 27.
In this case, in step S7, the state determination unit 27 monitors the measurement target person 2 based on the biological information of body movement and respiration that can be easily detected with sufficient accuracy.
Specifically, based on the body movement and respiration, in addition to the above-mentioned occupancy detection, it is detected that the measurement target person 2 is out of the bed 51 and whether or not the respiration is in the normal range, and the detection result is obtained. The caregiver and the like of the measurement target person 2 are notified by a notification device (not shown). For example, in the case of bedtime, if the measurement target person 2 stays at this position (outside the boundary K2) for a long time, or if the breathing is rough (breathing is more than at bedtime), it is notified as an abnormality. Is preferable.

When the measurement target person 2 is at the position marked with the symbol C (inside the boundary K1), the biological information detection device 10 selects and selects biological information corresponding to body movement, respiration, and pulse in step S6. The biometric information is input to the state determination unit 27.
In this case, in step S7, the state determination unit 27 monitors the measurement target person 2 based on the biological information corresponding to the body movement, respiration, and pulse that can be easily detected with sufficient accuracy.
Specifically, in addition to the above-mentioned occupancy detection, it is detected that the measurement target person 2 is in the bed 51 and whether or not the respiration and pulse are in the normal range, and the detection result is measured by a notification device (not shown). Notify the caregiver of the target person 2. For example, it is possible to determine whether or not a person is in a good sleep state based on respiration and pulse (also referred to as a good sleep estimation or a good sleep monitor), and if the person has not been able to sleep well for a long period of time, it is preferable to notify that fact.

As described above, in the present embodiment, the distance to the measurement target person 2 can be specified by using the microwave sensor 11, and can be specified from the information detected by the microwave sensor 11 according to the specified distance. Since the biometric information is selected from a plurality of types of biometric information, it is possible to select the biometric information that is easy to detect with high accuracy at that distance. Therefore, by determining the state of the measurement target person 2 based on the selected biological information, it is easy to improve the determination accuracy of the state of the measurement target person 2 while using the microwave sensor 11 capable of detecting a plurality of types of biological information. Become.

Further, the information processing unit 21 preferentially selects the biological information (body movement, respiration, body movement in the pulse, respiration, etc.) on the side having a larger amplitude corresponding to the movement as the specified distance becomes longer. Therefore, it is possible to avoid a situation in which biological information (for example, a pulse) on the side having a small amplitude, which becomes difficult to detect as the distance is long, is selected when the distance is long.
Specifically, when the specified distance exceeds the value Y (FIG. 2), which is a distance suitable for detecting the pulse, the information processing unit 21 includes a range having a smaller amplitude than the pulse for respiration and body movement. When at least one of them is selected and the value Z (FIG. 2), which is a distance suitable for detecting respiration, is exceeded, the body movement including a range having a smaller amplitude than respiration is selected. As a result, highly accurate biological information can be selected, and the accuracy of determining the state of the measurement target person 2 can be easily improved.

In the present embodiment, the case where the biometric information having a relatively large movement is preferentially selected as the specified distance is longer has been described, but the present invention is not limited to this. For example, if it is possible to select biometric information with relatively high accuracy by selecting biometric information on the side where the frequency is lower as the distance is longer, such biometric information may be selected. In short, it is sufficient to select biometric information that can be detected with relatively high accuracy according to the performance of the sensor 11.

(Second Embodiment)
FIG. 5 is a block diagram of the biological information detection device 10 according to the second embodiment.
In the second embodiment, the switching unit 29 in the information processing unit 21 is located in front of the body movement detection unit 24, the respiration detection unit 25, and the pulse detection unit 26, and the switching unit 29 is these detection units 24 to 26. It is different from the first embodiment in the latter stage. Further, in the second embodiment and each of the embodiments described later, the same configurations as those in the first embodiment are indicated by the same reference numerals.

In the second embodiment, since the switching unit 29 is located in front of the body movement detection unit 24, the respiration detection unit 25, and the pulse detection unit 26, it corresponds to the selection result of the determination unit 28 among these detection units 24 to 26. Only the detecting unit will detect the biological information. This makes it easier to reduce the amount of calculation. That is, the second embodiment is an advantageous configuration when the amount of calculation is reduced. Since the other points are the same as those of the first embodiment, various effects similar to those of the first embodiment can be obtained.

(Third Embodiment)
FIG. 6 is a block diagram of the biological information detection device 10 according to the third embodiment.
The third embodiment is different from the first embodiment in that the determination unit 28 and the switching unit 29 are not provided, and the state determination unit 27 performs the processing performed by the determination unit 28 and the switching unit 29. Therefore, the configuration can be easily simplified as compared with the case where the determination unit 28 and the switching unit 29 are configured by hardware.
In this third embodiment, the state determination unit 27 selects any biological information in body movement, respiration, and pulse according to the distance detected by the distance detection unit 23 (step S6 in FIG. 3). The state of the measurement target person 2 is determined based on the selected biological information. As a result, also in the third embodiment, it becomes easy to improve the determination accuracy of the state of the measurement target person 2 while using the microwave sensor 11 capable of detecting a plurality of types of biological information, which is the same as in the first embodiment. Various effects can be obtained.

(Fourth Embodiment)
FIG. 7 is a block diagram of the biological information detection device 10 according to the fourth embodiment.
In the fourth embodiment, the signal processing unit 12 of the third embodiment has a plurality of signal processing units (distance signal processing unit 12A, body movement signal processing unit 12B, respiratory signal processing unit 12C, and pulse signal processing unit 12D. The information acquisition unit 22 of the third embodiment is composed of a plurality of information acquisition units (distance information acquisition unit 22A, body movement information acquisition unit 22B, breathing information acquisition unit 22C, and pulse information acquisition unit 22D). It is different from the third embodiment in that it is composed of.

In the fourth embodiment, the signal input from the microwave sensor 11 is subjected to the distance and body by each of the distance signal processing unit 12A, the body movement signal processing unit 12B, the breathing signal processing unit 12C, and the pulse signal processing unit 12D. The waveform of the optimum frequency band for detecting motion, respiration and pulse is extracted. For example, the filters in each of the processing units 12A to 12D are formed in filters that extract only the waveforms of the frequency bands necessary for detecting distance, body movement, respiration, and pulse.

The waveforms extracted by the processing units 12A to 12D are passed through the AD conversion unit 13 to the distance information acquisition unit 22A, the body movement information acquisition unit 22B, the respiration information acquisition unit 22C, and the pulse information acquisition unit 22D. The data required for detecting distance, body movement, respiration, and pulse is acquired by each of the information acquisition units 22A to 22D. For example, the filters and the fast Fourier transform in each information acquisition unit 22A to 22D are formed in a configuration suitable for detecting distance, body movement, respiration, and pulse.
As a result, the fourth embodiment tends to improve the detection accuracy of distance, body movement, respiration and pulse. Since the other points are the same as those of the third embodiment, various effects similar to those of the third embodiment can be obtained.

(Fifth Embodiment)
The biological information detection device 10 according to the fifth embodiment is a device 10 suitable for use in an environment in which a plurality of people exist, and has another sensor 11T used for identifying the measurement target person 2. It is different from the first embodiment.
FIG. 8 is a diagram showing the biological information detection device 10 together with the living room 50 of the measurement target person 2.
Basically, one person 2 to be measured resides in the living room 50, but other people 2X and 2Y (hereinafter referred to as non-measurement subject 2X and 2Y) such as a caregiver or a family member who cares for the person 2 to be measured live. coming and going.

The other sensor 11T is a pressure sensor 11T1 that detects whether or not the measurement target person 2 or the like is present on the bed 51, and an RFID detection that receives a transmission signal of an RF tag owned by the measurement target person 2 on the bed 51. It is a sensor T2.
In the living room 50, the bed 51 is at a position where the measurement target person 2 is relatively likely to be present, and the microwave sensor 11 (biological information detection device 10 in this configuration) is arranged at a position close to the bed 51. It is configured so that the biological information of the measurement target person 2 can be easily acquired.

The biological information detection device 10 uses a microwave sensor 11 that sweeps and outputs a frequency (for example, the FMCW method), and acquires biological information in the living room 50 using the microwave sensor 11. Here, when the non-measurement target person 2X and 2Y exist in the living room 50, the biological information of the measurement target person 2 and the biological information of the non-measurement target person 2X and 2Y may be acquired together. Hereinafter, the operation when the biometric information of a plurality of people is acquired will be described with reference to FIG.

As shown in FIG. 9, first, the biometric information detection device 10 starts a specific process for identifying the measurement target person 2 by the information processing unit 21 (step S11). When the measurement target person 2 can be identified (step S12; YES), the biometric information detection device 10 uses biometric information acquired from a living body closer to the microwave sensor 11 (for example, a living body specified from a portion having a relatively high signal level). Information) is acquired as biometric information of the measurement target person 2 (step S13).
The specific process of step S11 is a process of detecting whether any of the following conditions (1) to (3) is satisfied.

(1) When the positions of a plurality of people in the living room 50 are determined from the detection result of the microwave sensor 11 by using a known technique for remotely measuring a plurality of positions, or a state in which each detected person is calm for a certain period of time. When it is detected that (= almost stopped) is detected (in this case, it is considered that the measurement target person 2 is in the bed 51 or a position close to the bed 51, and there is a possibility that the measurement target person 2 exists. Equivalent to detecting a person at a high position).
(2) When it is detected by the pressure sensor 11T1 provided on the bed 51 that someone has moved to the bed 51 (the measurement target 2 who is a user is likely to move to the bed 51, so the measurement target). Corresponds to the case where a person is detected at a position where the person 2 is likely to exist).
(3) When the RFID detection sensor T2 receives the transmission signal of the RF tag owned by the measurement target person 2 on the bed 51 (corresponding to the case where the position of the measurement target person 2 is specified).

In addition, an arbitrary process for specifying the measurement target person 2 may be applied to the specific process in step S11.
Subsequently, the biometric information detection device 10 executes a comparison process in which the information processing unit 21 compares the biometric information identified in step S13 with the past biometric information of the measurement target person 2 (step S14). The past biological information of the measurement target person 2 is stored in advance in a memory (not shown) provided in the information processing unit 21 or the like.

In this case, when the biometric information identified in step S13 and the past biometric information of the measurement target person 2 are clearly different (step S15; NO), the information processing unit 21 considers that they are not the same person and identifies the biometric information this time. Is not used for the subsequent state determination of the measurement target person 2 (corresponding to the process of step S7). FIG. 9 illustrates a case where the process proceeds to step S12 and the measurement target person 2 is specified again. However, the caregiver or the like of the measurement target person 2 is given the measurement target person 2 by the notification device (not shown). It is also possible to notify the information that the biological information of the above cannot be specified.

Here, the case where the biological information specified in step S13 and the past biological information of the measurement target person 2 are clearly different is, for example, the following case.
-When the difference between the biological information specified in step S13 and the biological information of the measurement target person 2 in normal times exceeds a predetermined allowable range.
-When the waveform corresponding to the biological information specified in step S13 is a special waveform having different characteristics from the waveform corresponding to the past biological information of the measurement target person 2.

When it is determined that the biometric information specified in step S13 and the past biometric information of the measurement target person 2 belong to the same person based on the comparison process in step S14 (step S15; YES), the information processing unit 21 , The state determination unit 27 determines the state of the measurement target person 2 based on the selected biological information (step S7).
By the above operation, the state of the measurement target person 2 can be determined even in an environment where a plurality of people exist. Since the other points are the same as those of the first embodiment, various effects similar to those of the first embodiment can be obtained.

Each of the above-described embodiments merely illustrates one embodiment of the present invention, and can be arbitrarily modified and applied without departing from the spirit of the present invention.
For example, in each of the above-described embodiments, the case where the microwave sensor 11 is used has been described, but the information does not have to be limited to the microwave sensor 11, and is information that can identify a plurality of types of biological information related to the living body. Moreover, a sensor capable of detecting information that can specify the distance to the living body can be widely applied. For example, by using an image sensor and using image recognition technology, it is possible to specify the distance to an object from the detected image and to detect a plurality of types of biological information such as body movement and respiration.

Further, the components of the biometric information detection device 10 described above may be divided or merged. In addition, each component can be arbitrarily realized by collaboration between hardware and software. Further, for each flowchart, the processes corresponding to each step may be divided or merged.

2 Measurement target person 2X, 2Y Non-measurement target person 10 Biometric information detection device 11 Microwave sensor 11T Other sensor 11T1 Pressure sensor 11T2 RFID detection sensor 12 Signal processing unit 13 AD conversion unit 14 Sensor control unit 21 Information processing unit 22 Information acquisition Part 23 Distance detection part 24 Body movement detection part 25 Breath detection part 26 Pulse detection part 27 State judgment part 28 Judgment part 28T Judgment table 29 Switching part

Claims (8)

A sensor that can identify a plurality of types of biological information about a living body to be measured and that can detect information that can specify the distance to the living body.
The distance is specified by using the sensor, biological information is selected from the plurality of types of biological information according to the specified distance, and the state of the living body is determined based on the selected biological information. Information processing department and
A biometric information detection device comprising. The sensor detects information corresponding to the movement of the living body as the plurality of types of living body information.
The information processing unit according to claim 1, wherein the longer the specified distance is, the more preferentially the biometric information on the side having the larger amplitude corresponding to the movement is selected as the biometric information of the specific target. Biological information detection device. The plurality of types of biological information include any one or more of the body movement, respiration, and pulse of the biological body.
When the distance exceeds a distance suitable for detecting the pulse, the information processing unit selects at least one of the respiration and the body movement including a range having a larger amplitude than the pulse, and the information processing unit selects the respiration. The biometric information detection device according to claim 2, wherein when the distance exceeds a distance suitable for detection, the body movement including a range having an amplitude larger than that of respiration is selected. When the biometric information of a plurality of living organisms is acquired by using the sensor, the information processing unit executes a specific process for identifying a biological body to be measured, and measures based on the specific result of the specific process. The biometric information detection device according to any one of claims 1 to 3, wherein the biometric information of the target biological body is specified. The specific process is characterized by at least one of a process of specifying the position of the living body to be measured and a process of detecting the presence of the living body at a position where the living body to be measured is likely to exist. The biological information detection device according to claim 4. After identifying the biological information of the living body to be measured, the information processing unit compares the biological information with the past biological information of the living body to be measured, and determines the state of the living body according to the comparison result. The biometric information detection device according to claim 4 or 5, wherein the determination process is selectively executed. The biological information detection device according to any one of claims 1 to 6, wherein the sensor is a microwave sensor. A sensor that can identify a plurality of types of biological information about a living body to be measured and that can specify a distance from the living body, and an information processing unit that processes the information. It is a control method of a biological information detection device provided with
The distance is specified by using the sensor, biological information is selected from the plurality of types of biological information according to the specified distance, and the state of the biological body is determined based on the selected biological information. A control method for a biological information detection device.

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