JP2006230791A - Sleep condition detecting system and sleep condition detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately detect a sleep condition of a subject by accurately grasping the subject's motion. <P>SOLUTION: The sleep condition detecting system comprises a sensor unit 2 for detecting acceleration generated along with the subject's motion, and a center device 1 for detecting the sleep condition of the subject according to a sensing signal detected by the sensor unit 2. The center device 1 is equipped with a reception part 13 for receiving the detected sensing signal, a threshold determining part 113 for determining whether or not the received sensing signal crosses a predetermined threshold, and a sleep condition determining part 114 for determining the sleep condition of the subject on the basis of the number of times when the sensing signal crosses the predetermined threshold. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sleep state detection system and a sleep state detection device that detect a sleep state of a subject using an acceleration sensor.

2. Description of the Related Art Conventionally, in order to grasp the sleep state of a subject, a device for attaching a sensor to a predetermined location on the body surface of the subject and performing a predetermined calculation on an output signal from the sensor to determine the sleep state of the human body has been conventionally used. Are known. For example, Japanese Patent Laid-Open No. 10-295649 analyzes each piece of acceleration data detected by a triaxial acceleration sensor and wirelessly detects a fall state for a predetermined time or an acceleration of a predetermined value or more as an abnormal signal. Is disclosed. Japanese Patent Application Laid-Open No. 2004-187916 is integrated with a first measuring unit that is mounted on a forehead portion of a subject and measures eye movements, and the first measuring unit. And a second measuring means such as an acceleration sensor for measuring the magnitude of disturbance to the sleep state detecting device for correcting the information of the eyeball potential when the magnitude of the disturbance exceeds a predetermined threshold Is disclosed.
Japanese Patent Laid-Open No. 10-295649 JP 2004-187916 A

  The above-described conventional technology discloses that the acceleration sensor is used to determine a person's fall state or sleep state, but it is intended to accurately detect the sleep state by accurately grasping the movement of the subject. It was not what I did.

  The present invention has been made paying attention to such a problem, and the object of the present invention is to provide a sleep state detection system and a sleep state capable of accurately grasping the sleep state of a subject with a simple configuration. It is to provide a detection device.

  In order to achieve the above object, a first aspect of the present invention is a sleep state detection system, which is communicable with a sensor unit mounted at a predetermined location on the body surface of a subject. A center device that is connected and detects a sleep state of the subject based on a sensing signal from the sensor unit, wherein the sensor unit detects an acceleration generated in accordance with the movement of the subject. And a transmission unit that transmits acceleration data acquired by the acceleration sensor as a sensing signal, and the center device includes a reception unit that receives the sensing signal transmitted from the sensor unit, and the reception unit. A threshold determination unit that determines whether or not the sensing signal received via the threshold crosses a predetermined threshold; and To anda sleep state determining unit determines sleep state of the object based on the number of times off.

According to a second aspect of the present invention, in the first aspect, the predetermined threshold is set to a predetermined gravitational acceleration value in the + and − directions with the acceleration value 0 as the center.

  In addition, according to a third aspect of the present invention, in the second aspect, the sleep state determination unit includes a time when the sensing signal crosses a predetermined threshold, and the sensing signal crosses the predetermined threshold immediately before this. When the time interval is shorter than the predetermined time interval, it is not included in the number of times that the sensing signal crosses the predetermined threshold.

  According to a fourth aspect of the present invention, in the first aspect, the acceleration sensor includes a plurality of acceleration sensors, and the threshold value determination unit is configured such that any one of a plurality of sensing signals detected by the plurality of acceleration sensors is a predetermined value. It is determined whether or not the threshold value is crossed, and the sleep state determination unit determines the sleep state of the subject based on the number of times that the predetermined threshold value is crossed.

  Further, according to a fifth aspect of the present invention, in the first aspect, the acceleration sensor includes a plurality of acceleration sensors, and the threshold determination unit obtains an average value of a plurality of sensing signals detected by the plurality of acceleration sensors, and It is determined whether the average value crosses a predetermined threshold value, and the sleep state determination unit determines the sleep state of the subject based on the number of times that the predetermined value crosses the predetermined threshold value.

  According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the sensor unit is controlled based on a command from the center device.

  According to a seventh aspect of the present invention, there is provided a sleep state detection apparatus, which is attached to a predetermined location on the body surface of a subject and detects an acceleration generated by the movement of the subject as a sensing signal. And a threshold determination unit that determines whether or not the sensing signal obtained by the acceleration sensor crosses a predetermined threshold, and determines the sleep state of the subject based on the number of times the sensing signal crosses the predetermined threshold A sleep state determination unit.

  According to an eighth aspect of the present invention, in the seventh aspect, the predetermined threshold is set to a predetermined gravitational acceleration value in the + and − directions with the acceleration value 0 as a center.

  In addition, according to a ninth aspect of the present invention, in the seventh or eighth aspect, the sleep state determination unit includes a time when the sensing signal crosses a predetermined threshold, and the sensing signal A time interval from the time when the threshold is crossed is obtained, and if this time interval is shorter than the predetermined time interval, the sensing signal is not included in the number of times the predetermined threshold is crossed.

  According to a tenth aspect of the present invention, in the seventh aspect, the acceleration sensor includes a plurality of acceleration sensors, and the threshold value determination unit is configured so that any one of a plurality of sensing signals detected by the plurality of acceleration sensors is a predetermined value. It is determined whether or not the threshold value is crossed, and the sleep state determination unit determines the sleep state of the subject based on the number of times that the predetermined threshold value is crossed.

  An eleventh aspect of the present invention is the seventh aspect, wherein the acceleration sensor includes a plurality of acceleration sensors, and the threshold determination unit obtains an average value of a plurality of sensing signals detected by the plurality of acceleration sensors, It is determined whether the average value crosses a predetermined threshold value, and the sleep state determination unit determines the sleep state of the subject based on the number of times that the predetermined value crosses the predetermined threshold value.

  According to a twelfth aspect of the present invention, there is provided a sleep state detection apparatus, which is attached to a predetermined location on the body surface of a subject and detects an acceleration generated in accordance with the movement of the subject, A sensor unit comprising a sensing signal accumulation unit for accumulating a sensing signal detected by an acceleration sensor, and a center device provided separately from the sensor unit, the sensing unit accumulating in the sensing signal accumulation unit A threshold determination unit that captures a signal and determines whether the sensing signal crosses a predetermined threshold; and a sleep state that determines the sleep state of the subject based on the number of times the sensing signal crosses the predetermined threshold And a center device including a determination unit.

  According to the present invention, since the movement of the subject can be accurately grasped by monitoring the sensing signal, the sleep state of the subject can be accurately detected with a simple configuration.

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

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a sleep state detection system according to the first embodiment of the present invention. In the present embodiment, the “sleep state” means a state in which the subject is lying with the intention to sleep, and includes not only when the subject is actually sleeping but also when lying unsleeping.

  The sensor unit 2 is modularized and attached to a predetermined location (here, a chest) on the body surface of the subject 4 to be monitored. Here, as an example of the mounting, an adhesive double-sided adhesive tape is used. The acrylic double-sided adhesive tape is less prone to irritation such as rash on the skin of the subject 4, and when the sensor unit 2 is peeled off from the subject 4, the adhesive glue is less likely to adhere to the surface of the sensor unit 2 or the subject 4. It has the advantage that the adhesive layer can be made thin.

  The sensor unit 2 includes an acceleration sensor, which will be described later, and detects acceleration generated by the left-right movement of the subject 4 in the sleep state by the acceleration sensor. A specific definition of the subject 4 in the left-right direction will be described later.

  The acceleration data acquired by the acceleration sensor is transmitted as a sensing signal 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 BT (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.

  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 for the question between the sensor unit 2 and the wireless repeater, a weak or low power type method such as BT or wireless LAN is used, whereas a wireless communication method for the question between the wireless repeater and the center device 1 is used. As the mobile phone system, a method capable of long-distance communication 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 from the sensor control unit 16 and a reception antenna function for receiving a sensing signal from the sensor unit 2, and switching of this function is connected to the antenna unit 11. This 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 a sensing signal obtained by this demodulation to the sensor data collection processing unit 15. The transmission unit 14 modulates the control signal output from the sensor control unit 16 and converts it into a radio signal, and transmits the 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 outputs a control signal including a command related to the start of sensing by the sensor unit 2 and the sensing cycle.

  The sensor data collection processing unit 15 is a part that determines the sleep state of the subject 4 when the received sensing signal crosses a predetermined threshold value, and determines the sleep state of the subject 4. Detailed functions will be described later.

  FIG. 2 shows the subject 4 lying on the bed 5 and sleeping. The sensor unit 2 is attached to the right chest of the subject 4. Although it is conceivable to move the body of the subject 4 such as hitting it while sleeping, the sensor unit 2 here includes an acceleration sensor that detects the movement of the subject 4 in the left-right direction. Here, the movement in the left-right direction means a movement in the width direction of the body (left-right direction with respect to the body center line) in a state where the subject 4 is lying as shown in FIG.

  FIG. 3 shows the relationship between each posture in the horizontal movement of the subject 4 in the sleeping state, the direction of the acceleration sensor 251 that detects the horizontal movement, and the sensor measurement value. 3A to 3D show postures of the subject 4 when viewed from the direction of the arrow P (FIG. 2), that is, from the overhead. Further, the symbol * in the figure indicates the + direction of the acceleration sensor 251.

  FIG. 3A shows a state in which the subject 4 turns 90 degrees counterclockwise from the supine state and turns to the side, and FIG. 3B shows a state in which the subject 4 is lying on his back. (C) is a state where a turn is turned 45 degrees clockwise from the supine state. (D) is a state where the subject 4 is turned 90 degrees in a clockwise direction from the supine state and turned over. Show.

  When the subject 4 is in the posture shown in FIG. 3A, the acceleration sensor 251 faces in the vertical direction (FIG. 3E). In this case, since the gravity is applied as it is, the sensor measurement value is positive (+ ) In the direction ((I) in FIG. 3). Further, when the subject 4 is in the posture shown in FIG. 3B, the acceleration sensor 251 faces in the horizontal direction (FIG. 3F), but this direction is orthogonal to gravity, so the sensor measurement value. Becomes 0 ((J) in FIG. 3). Further, when the subject 4 is in the posture shown in FIG. 3C, the acceleration sensor 251 is directed in a direction inclined by 45 degrees (FIG. 3G). In this case, the sensor measurement value is the vertical direction. A sensor value corresponding to the projected component is obtained ((K) in FIG. 3). When the subject 4 is in the posture shown in FIG. 3D, the acceleration sensor 251 faces in the vertical direction ((H) in FIG. 3). However, the + direction of the acceleration sensor 251 is on the lower side. Therefore, in this case, since gravity in the opposite direction is applied, the sensor measurement value takes the maximum value in the minus (−) direction ((L) in FIG. 3).

  FIG. 4 shows a schematic configuration of the sensor unit 2. The antenna unit 21, the sensing signal transmitting unit 22, the sensor driving signal receiving unit 23, the sensor driving control unit 24, the sensor main body 25, and the battery 26 are shown in FIG. I have. 5 shows the configuration of the sensor body 25 and the sensor drive control unit 24 of the sensor unit 2 shown in FIG. 4, and FIG. 6 shows the sensing signal 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. 5, the sensor body 25 includes an acceleration sensor 251 that detects the movement of the subject 4 in the left-right direction. The sensor drive control unit 24 includes a central processing unit (CPU) 243, a storage unit 242, a clock signal generation unit 245, an AD conversion unit 241, and a server programming interface (SPI) 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 controls the sensing signal transmitting unit 22 and the sensor driving signal receiving unit 23 of FIG. 4 including the acceleration sensor 251 of the sensor body 25, and starts sensing and sensing sent from the center device 1 described above. The contents of the command such as the 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 sensing start and sensing cycle is generated as a drive signal.

  The AD conversion unit 241 converts detection data from the acceleration sensor 211 driven by a control signal from the CPU 243 into a digital signal, and outputs it as a sensing signal 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 made 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 sensing signal transmission unit 22 and the sensor drive signal reception unit 23 as a drive power source. It comes to supply.

  As shown in FIG. 6, the sensing signal 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 sensing signal transmission unit 22 takes the sensing signal 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. Sensing data is created by converting the data into a predetermined format via the unit 224, the created sensing data is power amplified by the power amplifying unit 225, and the center device 1 from the transmission / reception signal distribution unit 226 via the antenna unit 21. 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. 7 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 111, a data averaging processing unit 112, a threshold value determination unit 113, and a sleep state determination unit 114. It consists of.

  The operation of the sensor data collection processing unit 15 will be described below with reference to the flowchart of FIG. Here, since the purpose is to detect the sleep state of the subject 4, the center device 1 continues the sensing signal from the sensor unit 2 until the subject 4 becomes awake after the sleep state enters the sleep state. Shall be received.

  First, 0 is substituted into a variable N representing the number of times the subject 4 has been turned over (step S1). Next, when a sensing signal as acceleration data is received from the receiving unit 13 (step S2), the acceleration data is temporarily stored in the acceleration data storage unit 111 (step S3).

  Next, the stored acceleration data is read out as appropriate, and the data averaging processor 112 averages the data by a method such as moving average (step S4). Note that the averaging process here is performed to exclude unnecessary components, and is not an essential process for detecting a sleep state.

  Next, the threshold determination unit 113 determines whether or not the averaged acceleration data value crosses a predetermined threshold (step S5). Here, when the predetermined threshold value is crossed, the acceleration data having a value smaller than the threshold value is larger than the threshold value and crosses the predetermined threshold value, and when the acceleration data having a value larger than the threshold value is smaller than the threshold value. Both cases when a predetermined threshold is crossed are included. When the determination in step S5 is YES, the sleep state determination unit 114 sets the time when the value of the acceleration data crosses the predetermined threshold and the time when the value of the acceleration data crosses the threshold immediately before this An interval is obtained, and it is determined whether this time interval is shorter than a predetermined time interval (step S6). If the determination here is NO, N is incremented by 1 (step S7), and the process returns to step S2.

  If the determination result in step S5 is NO or the determination result in step S6 is YES, the process immediately returns to step S2. Thereafter, the processes from step S2 to S7 are repeated until the reception of the acceleration data is completed, and the number of times that the value of the acceleration data crosses the threshold during this period is counted by the sleep state determination unit 114. Then, when the value of the acceleration data crosses the threshold value, the subject 4 is regarded as having turned over and the sleep state of the subject 4 is determined based on the count value at that time. The sleep state determination unit 114 can determine that the sleep state of the subject 4 is not good when, for example, the number of times of turning over is large.

  In step S6, if the time interval when the acceleration data value crosses the threshold is short, it is not included in the number of wake-ups. This is because the acceleration data value is short in the normal sleep state. This is because the threshold is rarely crossed frequently, so that if such a situation occurs, it is not considered to be turned over in order to maintain the accuracy of detection. The time interval is about 10 seconds, for example.

FIG. 9 is a graph showing acceleration data associated with the movement of the subject 4 in the left-right direction from when the subject 4 enters the sleep state to when the subject 4 awakes. The vertical axis represents the acceleration (cm / s ² ) of the right chest acceleration sensor, and the horizontal axis represents time (arbitrary scale). Here, for example, assuming that gravity acceleration 980 cm / s ² × 0.6 = 588 cm / s ² is the threshold value m and −m in the + direction and − direction, the value of acceleration data is the threshold value m in the + direction at points E and F. It can be seen that at points A, B, C and D, the threshold in the-direction -m is crossed. The sleep state determination unit 114 can accurately grasp the number of times the subject 4 has turned over by counting the points A to F where the acceleration data crosses the threshold values m and −m in the above procedure. The sleep state of the specimen can be accurately detected.

The value of 588 cm / s ² is an example, and may vary depending on the subject and the measurement time zone.

(Second Embodiment)
FIG. 10 is a flowchart for explaining the operation of the sensor data collection processing unit 15 according to the second embodiment of the present invention. In the second embodiment, the measurement is performed by attaching the left and right sensor units 2 to the right and left breasts of the subject 4, respectively. Here, acceleration data obtained from each acceleration sensor 251 is referred to as acceleration data A and B, respectively. First, 0 is substituted for a variable N indicating the number of times of turning (step S10). Thereafter, averaged acceleration data A is acquired by the same procedure as steps S2 to S4 in FIG. 8 (steps S11 to S13). Similarly, averaged acceleration data B is acquired (steps S14 to S16).

  Next, the threshold determination unit 113 selects the larger value of the averaged acceleration data A and the averaged acceleration data B (step S17), and the selected acceleration data value. Is determined to cross a predetermined threshold (step S18). In the case of YES here, the sleep state determination unit 114 indicates that the time when the value of the selected acceleration data crosses the predetermined threshold and the value of the acceleration data selected immediately before this cross the predetermined threshold. A time interval with the hour is obtained, and it is determined whether or not this time interval is shorter than a predetermined time interval (step S19). If the determination here is NO, N is incremented by 1 (step S20), and the process returns to steps S11 and S14. If the determination result in step S18 is NO or the determination result in step S19 is YES, the process immediately returns to steps S11 and S14. Thereafter, the processing from step S11 to S20 is repeated until the reception of the acceleration data is completed, and the number of times that the value of the acceleration data crosses a predetermined threshold during this period is counted by the sleep state determination unit 114.

  FIG. 11 is a diagram comparing the acceleration data of the right chest acceleration sensor (FIG. 11A) and the acceleration data of the left chest acceleration sensor (FIG. 11B). In FIG. 11A, the acceleration data values cross the thresholds m and −m at points A, B, C, D, E, and F. In FIG. 11B, the points C, D, E, and Only in F, the value of acceleration data crosses the threshold values m and -m. Therefore, in this case, if the acceleration data of only the left chest acceleration sensor is used, points A and B cannot be detected. Therefore, in this embodiment, by using the acceleration data of the left and right chest acceleration sensors, the detection accuracy is improved by eliminating detection leakage.

  According to the second embodiment described above, whether or not the value of the acceleration data crosses the predetermined threshold value is determined based on the two types of acceleration data relating to the right chest and the left chest. Even if it is not possible to detect crossing the predetermined threshold, the remaining acceleration data can be detected, and the sleep state of the subject can be detected more accurately.

(Third embodiment)
FIG. 12 is a flowchart for explaining the operation of the sensor data collection processing unit 15 according to the third embodiment of the present invention. In the third embodiment, as in the second embodiment, measurement is performed with the right and left sensor units 2 attached to the right and left chests of the subject 4, respectively, but two types of averaged acceleration data are acquired. After processing is different. The acceleration data obtained from each acceleration sensor 251 is referred to as acceleration data A and B, respectively. First, 0 is substituted into a variable N indicating the number of times of turning (step S30). Thereafter, averaged acceleration data A is acquired by the same procedure as steps S2 to S4 in FIG. 8 (steps S31 to S33). Similarly, averaged acceleration data B is acquired (steps S34 to S36).

  Next, the threshold determination unit 113 calculates an average value of the averaged acceleration data A and the averaged acceleration data B (step S37), and the calculated average value crosses a predetermined threshold. Is determined (step S38). In the case of YES here, the sleep state determination unit 114 indicates the time when the calculated average value crosses the predetermined threshold and the average value calculated immediately before this cross the predetermined threshold. A time interval with respect to time is obtained, and it is determined whether or not this time interval is shorter than a predetermined time interval (step S39). If the determination here is NO, N is incremented by 1 (step S40), and the process returns to steps S31 and S34. If the determination result in step S38 is NO or the determination result in step S39 is YES, the process immediately returns to steps S31 and S34. Thereafter, the processes from step S31 to S40 are repeated until the reception of acceleration data is completed, and the number of times that the average value crosses a predetermined threshold value is counted by the sleep state determination unit 114 during this time.

  FIG. 13 is a graph showing changes in the average value of the acceleration data value of the left chest acceleration sensor (FIG. 11A) and the acceleration data value of the right chest acceleration sensor (FIG. 11B). FIG. As can be seen from FIG. 13, the average value crosses the threshold value m in the + direction at points E and F, and crosses the threshold value −m in the − direction at points A, B, C, and D. Therefore, the sleep state determination unit 114 can determine the sleep state by regarding the subject 4 as having turned over at points A, B, C, D, E, and F.

  According to the third embodiment described above, the average value of the two types of acceleration data relating to the right chest and the left chest is taken, and turning over is determined based on whether this average value crosses a predetermined threshold value. Therefore, even if the value of either one of the acceleration data is small, if the remaining acceleration data is large to some extent, the average value thereof crosses the threshold, and the timing at which the subject 4 turns over is more accurate. Thus, the sleep state of the subject can be detected more accurately.

  In the first to third embodiments described above, the embodiment using one or two uniaxial acceleration sensors for detecting the left and right movement of the subject 4 has been described. However, the present invention is not limited to this. You may use the biaxial acceleration sensor which detects the motion of the subject 4 in the left-right and front-back direction, and the 3-axis acceleration sensor which detects the motion of the subject 4 in the up-down, left-right, and front-back direction.

(Fourth embodiment)
In the first to third embodiments, the sensing start timing and sensing cycle are given by a command from the center device 1, but the present invention is not limited to such a method. FIG. 14 shows an embodiment in which a setting function related to the sensing start timing and sensing cycle is 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 as a sensing signal. . 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. 15 shows a configuration of a modified example of the fourth 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 sensing signal storage unit 27 as sensing data. Thereafter, the sensing data is stored in a recording medium or the like and delivered to the center device 1. According to such a configuration, the sensing signal transmitting unit and the sensor driving signal receiving 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.

  In the first to fourth embodiments described above, the sensing signal detected by the acceleration sensor is transmitted to the center device via the communication line, and the sleep state of the subject is determined based on the sensing signal in the center device. However, the present invention is not necessarily limited to the configuration via the communication line. That is, the function of acquiring a sensing signal from the subject 4 and the function of determining the sleep state of the subject 4 based on the sensing signal may be housed in one housing as a sleep state detection device. Of course, it may be separately stored in the two housings.

  In addition, 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 which shows schematic structure of the sleep state detection system concerning 1st Embodiment of this invention. The appearance of the subject 4 lying on the bed 5 and sleeping is shown. It is a figure which shows the relationship between each attitude | position in the motion of the left-right direction of the test subject 4 in a sleep state, the direction of the acceleration sensor 251 which detects the motion of the left-right direction, and a sensor measurement value. 2 is a diagram showing a schematic configuration of a sensor unit 2. FIG. FIG. 5 is a diagram showing a schematic configuration of a center main body 25 and a sensor drive control unit 24 in the sensor unit 2 shown in FIG. 4. It is a figure which shows schematic structure of the sensing signal transmission part 22 and the sensor drive signal receiving part 23 in 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. 4 is a flowchart for explaining the operation of a sensor data collection processing unit 15. It is the figure which represented in a graph the acceleration data accompanying the motion of the subject 4 from the time the subject 4 enters a sleep state to the awakening. It is a flowchart for demonstrating operation | movement of the sensor data collection process part 15 which concerns on 2nd Embodiment of this invention. It is a figure which compares and shows the acceleration data (FIG. 11 (A)) of the acceleration sensor of a right chest, and the acceleration data (FIG. 11 (B)) of the acceleration sensor of a left chest. It is a flowchart for demonstrating operation | movement of the sensor data collection process part 15 which concerns on 3rd Embodiment of this invention. It is the figure which represented the change of the average value of the acceleration data value of the acceleration sensor of a left breast, and the acceleration data of the acceleration sensor of a right breast in the graph. It is a figure which shows embodiment when the setting function regarding the timing of a sensing start and a sensing period is provided in the sensor drive control part 24 in the sensor unit 2 as 4th Embodiment of this invention. It is a figure which shows the modification of 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Center apparatus 2 Sensor unit 3 Wireless network 4 Subject 5 Bed 11 Antenna part 12 Signal distributor 13 Reception part 14 Transmission part 15 Sensor data collection process part 16 Sensor control part 21 Antenna part 22 Sensing signal transmission part,
23 sensor drive signal receiving unit 24 sensor drive control unit 25 sensor main body 26 battery 111 acceleration data storage unit 112 data averaging processing unit 113 threshold determination unit 114 sleep state determination unit

Claims (12)

A sensor unit mounted at a predetermined location on the body surface of the subject, and a center device that is communicably connected to the sensor unit and detects a sleep state of the subject based on a sensing signal from the sensor unit; Comprising
The sensor unit is
An acceleration sensor for detecting an acceleration caused by the movement of the subject;
A transmission unit that transmits acceleration data acquired by the acceleration sensor as a sensing signal;
The center device is
A receiver for receiving a sensing signal transmitted from the sensor unit;
A threshold determination unit that determines whether or not a sensing signal received via the reception unit crosses a predetermined threshold;
A sleep state determination unit that determines the sleep state of the subject based on the number of times the sensing signal crosses the predetermined threshold;
A sleep state detection system comprising: The sleep state detection system according to claim 1, wherein the predetermined threshold is set to a predetermined gravitational acceleration value in the + and − directions with the acceleration value 0 as a center. The sleep state determination unit obtains a time interval between a time when the sensing signal crosses a predetermined threshold and a time when the sensing signal crosses the predetermined threshold immediately before, and the time interval is a predetermined time 3. The sleep state detection system according to claim 1, wherein if the time interval is shorter than the time interval, the sleep state detection system is not included in the number of times that the sensing signal crosses a predetermined threshold. The acceleration sensor is plural, the threshold value determination unit determines whether any of a plurality of sensing signals detected by the plurality of acceleration sensors crosses a predetermined threshold value, the sleep state determination unit, The sleep state detection system according to claim 1, wherein the sleep state of the subject is determined based on the number of times crossing the predetermined threshold. There are a plurality of acceleration sensors, and the threshold determination unit obtains an average value of a plurality of sensing signals detected by the plurality of acceleration sensors, determines whether the average value crosses a predetermined threshold, and the sleep The sleep state detection system according to claim 1, wherein the state determination unit determines the sleep state of the subject based on the number of times crossing the predetermined threshold. The sleep state detection system according to claim 1, wherein the sensor unit is controlled based on a command from the center device. An acceleration sensor that is attached to a predetermined location on the body surface of the subject, and detects acceleration generated as the subject moves as a sensing signal;
A threshold determination unit that determines whether or not a sensing signal obtained by the acceleration sensor crosses a predetermined threshold;
A sleep state determination unit that determines the sleep state of the subject based on the number of times the sensing signal crosses the predetermined threshold;
A sleep state detection apparatus comprising: The sleep state detection apparatus according to claim 7, wherein the predetermined threshold is set to a predetermined gravitational acceleration value in the + and − directions with the acceleration value 0 as a center. The sleep state determination unit obtains a time interval between a time when the sensing signal crosses a predetermined threshold and a time when the sensing signal crosses the predetermined threshold immediately before, and the time interval is a predetermined time The sleep state detection device according to claim 7 or 8, wherein if the time interval is shorter than the time interval, the sleep state detection device is not included in the number of times that the sensing signal crosses a predetermined threshold. The acceleration sensor is plural, the threshold value determination unit determines whether any of a plurality of sensing signals detected by the plurality of acceleration sensors crosses a predetermined threshold value, the sleep state determination unit, The sleep state detection apparatus according to claim 7, wherein the sleep state of the subject is determined based on the number of times crossing the predetermined threshold. There are a plurality of acceleration sensors, and the threshold determination unit obtains an average value of a plurality of sensing signals detected by the plurality of acceleration sensors, determines whether the average value crosses a predetermined threshold, and the sleep The sleep state detection apparatus according to claim 7, wherein the state determination unit determines the sleep state of the subject based on the number of times crossing the predetermined threshold. An acceleration sensor that is mounted at a predetermined location on the body surface of the subject and detects an acceleration caused by the movement of the subject; and a sensing signal accumulation unit that accumulates a sensing signal detected by the acceleration sensor. Sensor unit,
A center device provided separately from the sensor unit; a threshold determination unit that takes in a sensing signal stored in the sensing signal storage unit and determines whether the sensing signal crosses a predetermined threshold; A sleep state determination unit that determines a sleep state of the subject based on the number of times that the sensing signal crosses the predetermined threshold;
A sleep state detection apparatus comprising:

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