JP2007151617A - Biological information monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire biological information accurately from detected acceleration data with a simple configuration. <P>SOLUTION: A biological information monitoring system includes a sensor unit equipped with an acceleration sensor, and a sensor device for monitoring biological information detected by the acceleration sensor. The sensor device has data extracting sections 112 and 115 for extracting data of frequency bands A and B respectively which extract frequency components belonging to predetermined frequency bands from the acceleration data, and a biological information measurement section (a respiration data measurement section 114 and a heartbeat data measurement section 117) which converts the extracted frequency components of the acceleration data of the frequency bands into data of time components, acquires an interval of peak values on a time-axis, and measures biological information of a subject on the basis of the peak interval. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a biological information monitoring system that monitors biological information of a subject using an acceleration sensor.

2. Description of the Related Art Conventionally, a biological information monitor system that acquires biological information about a subject by attaching an acceleration sensor to a part of the subject's body has been known. For example, Japanese Patent Application Laid-Open No. 2002-17693 discloses a portable wireless telephone type vital checker in which a human body is equipped with a sensor capable of detecting heartbeat / respiration as biological information, and heartbeat / respiration and other biological information is detected to perform abnormality analysis. It is disclosed that if an abnormality is determined, a third party is notified to prevent a serious accident. It also describes the use of an acceleration sensor as an element for detecting the heartbeat / respiration of the human body.
JP 2002-17693 A

  The above prior art discloses that an acceleration sensor is used as an element for detecting a heartbeat / respiration of a human body, but there is no specific method for accurately measuring biological information from detected acceleration data. Not disclosed.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a biological information system that can acquire biological information with high accuracy and simple configuration from detected acceleration data. It is to provide.

    In order to achieve the above object, a first aspect of the present invention is a biological information monitoring system, comprising: a sensor unit mounted on a subject; and a communicably connected to the sensor unit. A center device that monitors biological information of the subject based on the acceleration data of the subject, and the sensor unit is acquired by an acceleration sensor that detects an acceleration caused by the movement of the subject, and the acceleration sensor. A transmission unit for transmitting the acceleration data, wherein the center device receives the acceleration data transmitted from the sensor unit, and the frequency of fluctuation of the acceleration data received via the reception unit. A frequency band data extraction unit for extracting a frequency component of acceleration data belonging to a specific frequency band from the components, and the frequency band data extraction Converting the frequency component of the acceleration data extracted in step 1 to time component data, obtaining a peak value interval on the time axis, and measuring the biological information of the subject based on the peak value interval; It comprises.

  Further, a second aspect of the present invention is the frequency in the first aspect, which is arranged in a preceding stage of the frequency band data extracting unit, and converts a change in acceleration data received through the receiving unit into frequency component data. A component conversion unit; and a time component conversion unit that is arranged at a subsequent stage of the frequency band data extraction unit and converts acceleration data extracted by the frequency band data extraction unit into time component data.

  A third aspect of the present invention is a biological information monitoring system, which is connected to a sensor unit mounted on a subject and is communicably connected to the sensor unit, and is based on acceleration data from the sensor unit. A center device that acquires biological information of the subject, and the sensor unit transmits an acceleration sensor that detects an acceleration caused by the movement of the subject, and acceleration data acquired by the acceleration sensor. A transmission unit, wherein the center device receives the acceleration data transmitted from the sensor unit, and a first frequency band from a frequency component of fluctuation of the acceleration data received via the reception unit. A first frequency band data extracting unit that extracts a frequency component of acceleration data belonging to the data, and a change in acceleration data received via the receiving unit. A second frequency band data extracting unit for extracting a frequency component of acceleration data belonging to the second frequency band from the frequency component of the first frequency band, and a time component for the frequency component of the acceleration data extracted by the first frequency band data extracting unit. In the first biological information measuring unit for obtaining the peak value interval on the time axis and measuring the first biological information based on the peak value interval, and the second frequency band data extracting unit A second biological information measuring unit that converts the frequency component of the extracted acceleration data into time component data, obtains a peak value interval on the time axis, and measures the second biological information based on the peak value interval; Are provided.

  According to a fourth aspect of the present invention, in the third aspect, a change in acceleration data, which is arranged before the first and second frequency band data extraction units and is received via the reception unit, is a frequency component. A frequency component converting unit that converts the data into the first frequency band data extracting unit, and a first component that converts the acceleration data extracted by the first frequency band data extracting unit into time component data. A first time component converting unit and a second time period arranged after the second frequency band data extracting unit to convert acceleration data extracted by the second frequency band data extracting unit into time component data A component conversion unit.

  According to a fifth aspect of the present invention, in the third or fourth aspect, the first biological information is a respiratory rate of the subject, and the second biological information is a heart rate of the subject. is there.

  According to a sixth aspect of the present invention, in the first to fifth aspects, the center device includes a transmission unit that transmits a control signal for controlling the operation of the sensor unit to the sensor unit. The sensor unit includes a receiving unit that receives a control signal from the center device.

  According to a seventh aspect of the present invention, there is provided a biological information monitoring system, an acceleration sensor that is attached to a subject and detects an acceleration caused by the movement of the subject, and an acceleration detected by the acceleration sensor. An acceleration data storage unit for storing data; and a center device provided separately from the sensor unit, wherein the center device stores acceleration data stored in the acceleration data storage unit. And extracting the frequency component of the acceleration data belonging to the specific frequency band from the frequency component of the fluctuation of the acceleration data, and the frequency component of the acceleration data extracted by the frequency band data extracting unit as time Converted into component data, a peak value interval on the time axis is obtained, and the biological information of the subject is calculated based on the peak value interval. Comprising a biological information measuring unit that measures.

  In addition, according to an eighth aspect of the present invention, in any one of the first to seventh aspects, the sensor unit is directly attached to the skin of the subject or attached to the clothing of the subject. .

  ADVANTAGE OF THE INVENTION According to this invention, biometric information is acquirable with a simple structure and accuracy from the acceleration data detected by the acceleration sensor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
The biological information monitoring system according to the first embodiment directly attaches the movement of the subject (the movement of the lungs when the subject breathes and the heartbeat (contraction and expansion) of the subject) to the skin of the subject. It is detected by an acceleration sensor built in the sensor unit, and biological information such as a respiratory rate and a heart rate of the subject is acquired by data processing to be described later.

  FIG. 1 is a diagram showing a schematic configuration of a biological information monitoring system according to the first embodiment of the present invention. The sensor unit 2 is modularized and is directly attached to the skin of the chest of the subject 4 to be monitored. The sensor unit 2 includes an acceleration sensor described later. Here, the acceleration sensor includes a normal direction (a direction perpendicular to the skin surface of the subject 4), a major axis direction (a height direction of the subject 4), and a minor axis direction (a lateral direction with respect to the height direction of the subject 4). This is a three-axis acceleration sensor that can detect acceleration in three directions.

  The acceleration data detected by the acceleration sensor inside the sensor unit 2 is transmitted to the center device 1 installed in a medical facility or a nursing facility via the wireless network 3.

  Here, as the wireless network 3, for example, a short-range data communication system such as BlueTooth (registered trademark), a wireless LAN (Local Area Network), a PHS (Personal Handyphone System) (registered trademark), a mobile phone system, or the like is used. The

  Note that the center device 1 and the sensor unit 2 are not necessarily connected directly, and may be connected via a wireless repeater. In this case, as a wireless communication method between the sensor unit 2 and the wireless repeater, and a wireless communication method between the wireless repeater and the center device 1, a weak or low power type method such as BT or wireless LAN is used. As a wireless communication method for questioning with the center device 1, a method capable of long-distance communication such as a mobile phone system is used.

  The center device 1 includes an antenna unit 11, a signal distribution unit 12, a reception unit 13, a transmission unit 14, a sensor data collection processing unit 15, and a sensor control unit 16. The antenna unit 11 has a transmission antenna function for transmitting a control signal generated by the sensor control unit 16 and an antenna function for receiving acceleration data from the sensor unit 2. Switching of this function is connected to the antenna unit 11. Is performed by the signal distributor 12 such as a circulator.

  The receiving unit 13 receives and demodulates a radio signal transmitted from the sensor unit 2 via the wireless network 3 and the antenna unit 11, and outputs acceleration data obtained by this demodulation to the sensor data collection processing unit 15. The transmission unit 14 modulates the control signal generated by the sensor control unit 16 and converts it into a radio signal, and transmits this radio signal from the antenna unit 11 toward the sensor unit 2.

  The sensor control unit 16 includes, for example, a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), and generates a control signal for controlling the operation of the sensor unit 2. The control signal includes commands such as the start and end timing of measurement by the acceleration sensor and the measurement cycle.

  The sensor data collection processing unit 15 is a part that measures respiration and heart rate as biological information of the subject 4 based on the acceleration data from the sensor unit 2, and detailed functions will be described later.

  FIG. 2 is a diagram showing the sensor unit 2 attached to the subject 4. As shown in FIG. 2, the sensor unit 2 of the present embodiment is directly attached to the skin of the subject 4 with a normal adhesive tape without using a conductive adhesive tape for attaching an electrocardiogram sensor or the like. . That is, the adhesive tape on which the electrocardiogram sensor or the like is attached needs to be conductive, and there is a problem that skin irritation occurs or the subject 4 is easily peeled off by perspiration. However, since the acceleration sensor is built in the sensor unit 2, the attachment to the subject 4 does not need to be a conductive adhesive tape. Therefore, there is an advantage that there is little skin irritation and it does not peel off even when sweating.

  FIG. 3 shows a schematic configuration of the sensor unit 2. The antenna unit 21, the acceleration data transmission unit 22, the sensor drive signal reception unit 23, the sensor drive control unit 24, the sensor main body 25, and the battery 26 are shown in FIG. I have. 4 shows the configuration of the sensor main body 25 and the sensor drive control unit 24 of the sensor unit 2 shown in FIG. 3, and FIG. 5 shows the acceleration data transmission unit 22 and the sensor drive signal reception unit 23 of the sensor unit 2 shown in FIG. The structure of is shown.

  As shown in FIG. 4, the sensor body 25 detects the movement of the subject 4 (the movement of the lungs when the subject 4 breathes and the pulsation (contraction and expansion) of the heart of the subject 4). Consists of The sensor drive control unit 24 includes a CPU (Central Processing Unit) 243, a storage unit 242, a clock signal generation unit 245, an AD conversion unit 241, and an SPI (Server Programming Interface) 244. .

  The clock signal generator 245 generates a clock signal having a predetermined period based on the clock control signal of the CPU 243. The storage unit 242 stores a program executed by the CPU 243. The CPU 243 drives and controls the acceleration data transmission unit 22 and the sensor drive signal reception unit 23 of FIG. 3 including the acceleration sensor 251 of the sensor body 25, and starts and ends the sensing sent from the center device 1 described above. Further, the contents of the command such as the sensing cycle are stored in a memory (not shown). Thereafter, a clock control signal is generated based on the stored command and the setting data stored in the storage unit 242 and output to the clock signal generation unit 245. Based on the clock signal generated by the clock signal generator 245, a signal related to the start and end of sensing and the sensing cycle is generated as a drive signal.

  The AD conversion unit 241 converts detection data from the acceleration sensor 251 driven by a control signal from the CPU 243 into a digital signal, and outputs it as acceleration data from the CPU 243 via the SPI 244.

  Note that a standby signal is used as a drive signal supplied from the CPU 243 to the acceleration sensor 251. The acceleration sensor 251 enters an operation state in which sensing is performed when the standby signal becomes “H” level, and enters a non-operation state, that is, a standby state with less power consumption when the signal becomes “L” level.

  The battery 26 is formed of, for example, a button-type lithium battery, and a DC voltage generated from the battery 26 is supplied to the sensor body 25, the sensor drive control unit 24, the acceleration data transmission unit 22 and the sensor drive signal reception unit 23 as a drive power source. It comes to supply.

  As shown in FIG. 5, the acceleration data transmission unit 22 includes an SPI 221, a digital signal control unit 222, a signal modulation unit 223, a mixing unit 224, a power amplification unit 225, and a transmission / reception signal distribution unit 226. I have. The sensor drive signal receiving unit 23 includes a crystal oscillator 232, a phase stabilization circuit 234, a voltage control type oscillator 236, a low noise amplification unit 238, a mixing unit 237, a signal demodulation unit 235, and digital signal control. Part 233 and SPI 231.

  The acceleration data transmission unit 22 takes acceleration data from the sensor drive control unit 24 into the digital signal control unit 222 via the SPI 221, and further performs digital modulation, for example, QPSK (Quadrature Phase Shift Keying) modulation, and mixing with the signal modulation unit 223. The acceleration data is generated by converting into a predetermined format via the unit 224, the generated acceleration data is power amplified by the power amplifying unit 225, and the center device 1 via the antenna unit 21 from the transmission / reception signal distribution unit 226. To send to.

  On the other hand, when the sensor drive signal receiving unit 23 receives the radio signal transmitted from the center device 1 by the antenna unit 21, the sensor drive signal receiving unit 23 takes in the mixing unit 237 via the transmission / reception signal distribution unit 226 and the low noise amplification unit 238. Here, after the radio signal is converted to a predetermined frequency mixed with the output of the voltage controlled oscillator 236, it is digitally demodulated by the signal demodulator 235, and the control signal obtained by this digital demodulation is transmitted from the digital signal controller 233 via the SPI 231. To the sensor drive control unit 24.

  FIG. 6 is a diagram showing the configuration of the sensor data collection processing unit 15 in the center device 1 in particular, and includes an acceleration data storage unit 110, an FFT (Fast Fourier Transform) processing unit 111, and a frequency band A data extraction unit 112. , An inverse FFT processing unit 113, a respiratory data measurement unit 114, a frequency band B data extraction unit 115, an inverse FFT processing unit 116, and a heart rate data measurement unit 117.

  The acceleration data storage unit 110 divides the acceleration data transmitted from the sensor unit 2 and received by the reception unit 13 into predetermined time intervals, and stores the acceleration data for each predetermined time interval. The FFT processing unit 111 is a frequency component conversion unit that performs FFT processing on acceleration data at predetermined time intervals and converts the acceleration data into frequency component data. The data extraction unit 112 of the frequency band A is a part that includes a band-pass filter and extracts acceleration data belonging to the frequency band A including respiratory data on the frequency axis of the acceleration data subjected to FFT processing. The inverse FFT processing unit 113 is a time component conversion unit that performs an inverse FFT process on the extracted acceleration data belonging to the frequency band A and converts the data into time component data. The respiration data measurement unit 10 is a part that obtains a peak value interval on the time axis of acceleration data subjected to inverse FFT processing and measures the respiration rate from the peak value interval.

  On the other hand, the data extraction unit 115 of the frequency band B is a part that includes a band pass filter and extracts acceleration data belonging to the frequency band B including the heartbeat data on the frequency axis of the FFT-processed acceleration data. The inverse FFT processing unit 116 is a time component conversion unit that performs inverse FFT processing on the extracted acceleration data belonging to the frequency band B and converts the acceleration data into time component data. The heart rate data measuring unit 117 is a part that obtains a peak value interval on the time axis of acceleration data subjected to inverse FFT processing and measures a heart rate from the peak value interval. In the present embodiment, the case of the FFT processing has been described. Besides this, as a method for converting data on the time axis into data on the frequency axis, Fourier transform processing, wavelet transform processing, or the like can be used.

  FIG. 7 shows an example of normal direction acceleration data detected by mounting the sensor unit 2 directly on the skin of the subject 4. The receiving unit 13 of the center device 1 receives acceleration data as shown in FIG.

  FIG. 8 shows an example of long-axis acceleration data detected when the sensor unit 2 is directly attached to the skin of the subject 4.

  FIG. 9 shows an example of acceleration data in the short axis direction detected when the sensor unit 2 is directly attached to the skin of the subject 4.

  As can be seen by comparing FIG. 7 to FIG. 9, when the sensor unit 2 is directly adhered to the skin of the subject 4, the detection sensitivity in the normal direction of the skin is good.

  FIG. 10 is an enlarged view of a part of the acceleration data in the normal direction (FIG. 7) detected when directly adhered to the skin of the subject 4. As can be seen from FIG. 10, it can be seen that the acceleration data detected by the acceleration sensor includes heart rate data 200 and respiration data 300. That is, the respiration data 300 is shown as a gentle fluctuation component with a long period of the baseline of acceleration data in the normal direction, and the heartbeat data 200 is shown as a fluctuation component with a short period of the acceleration data in the normal direction.

  FIG. 11 shows respiratory data obtained by performing data extraction on the acceleration data in the normal direction as shown in FIG. 7 by the data extraction unit 112 in the frequency band A and further processing by the inverse FFT processing unit 113.

  FIG. 12 shows heart rate data obtained by performing data extraction on the acceleration data in the normal direction as shown in FIG. 7 by the data extraction unit 115 in the frequency band B and further processing by the inverse FFT processing unit 116.

  The operation of the sensor data collection processing unit 15 will be described below with reference to the flowchart in FIG.

  First, the acceleration data transmitted from the sensor unit 2 and received by the receiving unit 13 is divided into predetermined time intervals, and temporarily stored in the acceleration data storage unit 110 for each acceleration data at the predetermined time intervals (step S1). Next, the stored acceleration data at predetermined time intervals is appropriately read out from the acceleration data storage unit 110 (step S2), and the FFT processing is performed on the acceleration data read out by the FFT processing unit 111 (step S3).

  Thereafter, processing for obtaining the respiration rate and heart rate of the subject 4 is simultaneously performed. First, the procedure of the process for obtaining the respiration rate will be described. The frequency band A data extraction unit 112 extracts acceleration data belonging to the frequency band A on the frequency axis from the FFT-processed acceleration data (step S4). Next, the inverse FFT processing unit 113 performs an inverse FFT process on the extracted acceleration data in the frequency band A (step S5). Next, the respiration data measurement unit 114 obtains the peak value interval of the acceleration data on the time axis, and measures the respiration rate from the peak value interval (step S6). For example, in the respiration data shown in FIG. 11, taking two peak values P1 and P2 of acceleration data as an example, the time between P1 and P2 corresponding to one respiration is about 2 seconds. From this, the respiration rate per minute is 60 (seconds) / 2 (seconds) = 30.

  Next, a procedure for obtaining the heart rate will be described. The frequency band B data extraction unit 115 extracts acceleration data belonging to the frequency band B on the frequency axis from the FFT-processed acceleration data (step S7). Next, the inverse FFT processing unit 116 performs an inverse FFT process on the extracted acceleration data in the frequency band B (step S8). Next, the heart rate data measuring unit 117 calculates the peak value interval of the acceleration data on the time axis, and measures the heart rate from the peak value interval (step S9). For example, in the heartbeat data shown in FIG. 12, taking the two peak values P1 'and P2' of acceleration data as an example, the time between P1 'and P2' is approximately 0.36 seconds. Since the heart beat has contraction and dilation, the acceleration sensor fluctuates twice in one beat, that is, one heart beat. Therefore, the time interval of one heartbeat is 2 × 0.36 = 0.72 seconds. From this, the heart rate per minute is calculated as 60 (seconds) /0.72 (seconds) = 83 times.

  In the present embodiment, a system configuration is assumed in which the respiratory rate and heart rate of the subject 4 are obtained simultaneously. However, the present invention is not limited to such a configuration, and the system configuration for obtaining either the respiratory rate or the heart rate is not limited thereto. It is also good. That is, for example, when only the respiration rate of the subject 4 is obtained, the data extraction unit 115, the inverse FFT processing unit 116, and the heart rate data measurement unit 117 in the frequency band B are not necessary in the configuration of FIG. Further, regarding the flowchart of FIG. 13, steps S7, S8, and S9 are not necessary. When only the heart rate of the subject 4 is obtained, the data extraction unit 112, the inverse FFT processing unit 113, and the respiration data measurement unit 114 in the frequency band A are not necessary in the configuration of FIG. Further, regarding the flowchart of FIG. 13, steps S4, S5, and S6 are unnecessary.

  According to the first embodiment described above, biological information can be obtained with high accuracy and with a simple configuration from the acceleration data detected by the acceleration sensor.

(Second Embodiment)
The second embodiment of the present invention will be described below. The biological information monitoring system according to the second embodiment incorporates the movement of the lungs when the subject breathes and the pulsation (contraction and expansion) of the heart of the subject in a sensor unit attached to the subject's clothes. And detecting biological information such as the respiratory rate and heart rate of the subject by data processing described later. In the second embodiment, the sensor unit 2 is not attached to the skin of the subject 4 but is worn on the clothes worn by the subject 4, that is, the environment in which acceleration data is acquired is different. This can be realized by a system configuration similar to that of the embodiment. That is, the acceleration data detected by the acceleration sensor in the sensor unit 2 is transmitted to the center device, and the center device receives the acceleration data and performs the same processing as in the first embodiment to calculate the respiratory rate of the subject 4. Measure heart rate.

  FIG. 14 shows the system configuration of the second embodiment. As shown in FIG. 14, the center unit 2 is attached to a portion corresponding to the chest of the clothes 4-1 worn by the subject 4.

  FIG. 15 shows acceleration data in the normal direction detected when the sensor unit 2 is attached to the clothing 4-1 of the subject 4.

  FIG. 16 shows acceleration data in the long axis direction detected when the sensor unit 2 is attached to the clothing 4-1 of the subject 4.

  FIG. 17 shows acceleration data in the short axis direction detected when the sensor unit 2 is attached to the clothing 4-1 of the subject 4.

  As can be seen from FIGS. 15 to 17, when the sensor unit 2 is attached to the garment 4-1 of the subject 4, the detection sensitivity in the normal direction is not necessarily good, and the major axis direction or the short axis direction is not necessarily good. Often the axial detection sensitivity is better. Therefore, the best data is selected from the acceleration data in the three directions obtained at that time.

  According to the second embodiment described above, biological information can be obtained with high accuracy and with a simple configuration from the acceleration data detected by the acceleration sensor.

(Third embodiment)
In the first and second embodiments, the start and end of sensing and the sensing cycle are given by commands from the center device 1, but the present invention is not limited to such a method.

  FIG. 18 shows a configuration of a third embodiment in which setting functions related to sensing start and end and sensing cycle are provided in the sensor drive control unit 24 in the sensor unit 2. In this case, the acceleration sensor in the sensor body 25 starts a sensing operation in accordance with a command from the sensor drive control unit 24, and the detected acceleration data is transmitted to the center device 1 via the antenna unit 21. According to such a configuration, the sensor drive signal receiving unit inside the sensor unit 2 can be omitted. Furthermore, the signal distribution unit 12, the transmission unit 14, and the sensor control unit 16 in the center device 1 can be omitted.

  FIG. 19 shows a configuration of a modification of the third embodiment of the present invention. Here, the acceleration data detected by the acceleration sensor based on the designation from the sensor drive control unit 24 is temporarily stored in the acceleration data storage unit 27. Thereafter, the acceleration data is stored in a recording medium or the like and delivered to the center device 1. According to such a configuration, the acceleration data transmission unit and the sensor drive signal reception unit inside the sensor unit 2 can be omitted. Furthermore, the antenna unit 11, the signal distribution unit 12, the reception unit 13, the transmission unit 14, and the sensor control unit 16 in the center device 1 can be omitted.

  The configurations of the center device 1 and the sensor unit 2, the types of sensing objects, and the like can be variously modified and implemented without departing from the gist of the present invention. In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage.

  Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

It is a figure showing a schematic structure of a living body information monitor system concerning a 1st embodiment of the present invention. FIG. 3 is a diagram showing a state where a sensor unit 2 is mounted on a subject 4. 2 is a diagram showing a schematic configuration of a sensor unit 2. FIG. It is a figure which shows the structure of the sensor main body 25 and the sensor drive control part 24 of the sensor unit 2 shown in FIG. It is a figure which shows the structure of the acceleration data transmission part 22 and the sensor drive signal receiving part 23 of the sensor unit 2 shown in FIG. In the center apparatus 1, it is a figure which shows the structure of the sensor data collection process part 15 especially. It is a figure which shows an example of the acceleration data of the normal direction detected by mounting | wearing the skin of the subject 4 with the sensor unit 2 directly. It is a figure which shows an example of the acceleration data of the major axis direction detected when the sensor unit 2 is directly mounted | worn on the skin of the subject 4. FIG. It is a figure which shows an example of the acceleration data of the short-axis direction detected when the sensor unit 2 is directly mounted | worn with the skin of the subject 4. FIG. It is the enlarged view to which a part of acceleration data (FIG. 7) in the normal direction detected when directly adhered to the skin of the subject 4 is enlarged. It is a figure which shows the data regarding the respiration of the subject 4 obtained after performing data extraction with respect to the acceleration data of the normal line direction as shown in FIG. It is a figure which shows the data regarding the heartbeat of the subject 4 obtained after performing data extraction with respect to the acceleration data of the normal direction as shown in FIG. 4 is a flowchart for explaining the operation of a sensor data collection processing unit 15. It is a figure which shows the system configuration | structure of 2nd Embodiment of this invention. It is a figure which shows the acceleration data of the normal direction detected when the sensor unit 2 is mounted | worn with the clothes 4-1 of the subject 4. FIG. It is a figure which shows the acceleration data of the major axis direction detected when the sensor unit 2 is mounted | worn with the clothes 4-1 of the subject 4. FIG. It is a figure which shows the acceleration data of the short-axis direction detected when the sensor unit 2 is mounted | worn with the clothes 4-1 of the subject 4. FIG. It is a figure which shows the structure of the sensor unit of 3rd Embodiment of this invention. It is a figure which shows the structure of the sensor unit of the modification of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center apparatus 2 Sensor unit 3 Wireless network 4 Subject 11 Antenna part 12 Signal distributor 13 Receiver 14 Transmitter
DESCRIPTION OF SYMBOLS 15 Sensor data collection process part 16 Sensor control part 21 Antenna part 22 Acceleration data transmission part 23 Sensor drive signal reception part 24 Sensor drive control part 25 Sensor main body 26 Battery 110 Acceleration data storage part 111 FFT process part 112 Data extraction of the frequency band A Unit 113 Inverse FFT processing unit 114 Respiration data measurement unit 115 Data extraction unit 116 in frequency band B Inverse FFT processing unit 117 Heart rate data measurement unit

Claims (8)

A biological information monitoring system, a sensor unit mounted on a subject, a center device connected to the sensor unit so as to be communicable, and monitoring biological information of the subject based on acceleration data from the sensor unit; , And
The sensor unit is
An acceleration sensor for detecting an acceleration caused by the movement of the subject;
A transmission unit for transmitting acceleration data acquired by the acceleration sensor,
The center device is
A receiving unit for receiving acceleration data transmitted from the sensor unit;
A frequency band data extracting unit that extracts a frequency component of acceleration data belonging to a specific frequency band from a frequency component of fluctuation of acceleration data received via the receiving unit;
The frequency component of the acceleration data extracted by the frequency band data extraction unit is converted into time component data, the peak value interval on the time axis is obtained, and the biological information of the subject is measured based on the peak value interval. A biological information measuring unit;
A biological information monitoring system comprising: A frequency component conversion unit that is arranged in a preceding stage of the frequency band data extraction unit and converts fluctuations in acceleration data received via the reception unit into frequency component data;
A time component conversion unit that is arranged at a subsequent stage of the frequency band data extraction unit and converts acceleration data extracted by the frequency band data extraction unit into time component data;
The biological information monitoring system according to claim 1, further comprising: A biological information monitoring system, a sensor unit mounted on a subject, and a center device that is communicably connected to the sensor unit and acquires biological information of the subject based on acceleration data from the sensor unit; , And
The sensor unit is
An acceleration sensor for detecting an acceleration caused by the movement of the subject;
A transmission unit for transmitting acceleration data acquired by the acceleration sensor,
The center device is
A receiving unit for receiving acceleration data transmitted from the sensor unit;
A first frequency band data extracting unit that extracts a frequency component of acceleration data belonging to the first frequency band from a frequency component of fluctuation of acceleration data received via the receiving unit;
A second frequency band data extracting unit that extracts a frequency component of acceleration data belonging to the second frequency band from a frequency component of fluctuation of acceleration data received via the receiving unit;
The frequency component of the acceleration data extracted by the first frequency band data extraction unit is converted into time component data, a peak value interval on the time axis is obtained, and the first biological information is obtained based on the peak value interval. A first biological information measuring unit for measuring;
The frequency component of the acceleration data extracted by the second frequency band data extraction unit is converted into time component data, the peak value interval on the time axis is obtained, and the second biological information is obtained based on the peak value interval. A second biological information measuring unit for measuring;
A biological information monitoring system comprising: A frequency component conversion unit that is arranged in front of the first and second frequency band data extraction units, and converts fluctuations in acceleration data received through the reception unit into frequency component data;
A first time component conversion unit that is arranged at a subsequent stage of the first frequency band data extraction unit and converts acceleration data extracted by the first frequency band data extraction unit into time component data;
A second time component conversion unit that is arranged at a subsequent stage of the second frequency band data extraction unit and converts acceleration data extracted by the second frequency band data extraction unit into time component data;
The biological information monitor system according to claim 3, further comprising:   The biological information monitoring system according to claim 3 or 4, wherein the first biological information is a respiration rate of the subject, and the second biological information is a heart rate of the subject.   The center device includes a transmission unit that transmits a control signal for controlling the operation of the sensor unit to the sensor unit, and the sensor unit includes a reception unit that receives a control signal from the center device. The biological information monitoring system according to claim 1, wherein the biological information monitoring system is provided. A biological information monitoring system, comprising: an acceleration sensor that is attached to a subject and detects an acceleration caused by the movement of the subject; and an acceleration data accumulation unit that accumulates acceleration data detected by the acceleration sensor. Provided with a sensor unit and a center device provided separately from the sensor unit,
A frequency band data extraction unit that takes in acceleration data stored in the acceleration data storage unit and extracts a frequency component of acceleration data belonging to a specific frequency band from a frequency component of fluctuations in acceleration data;
The frequency component of the acceleration data extracted by the frequency band data extraction unit is converted into time component data, the peak value interval on the time axis is obtained, and the biological information of the subject is measured based on the peak value interval. A biological information measuring unit;
A biological information monitoring system comprising:   The biological information monitoring system according to claim 1, wherein the sensor unit is directly attached to the skin of the subject or attached to the clothes of the subject.

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