Biological signal detection module and biological signal detection system

Abstract

To measure biological signals in a narrow contact range near a generation source of the biological signals.SOLUTION: A biological signal detection module 100 comprises: a plurality of sensors 110 which detect biological signals of a measured person HM; and a support body 120 which is provided with the plurality of sensors and is provided at a position in contact with the chest or the back of the measured person at an article 300 in contact with the upper body of the measured person. A detection range of the biological signal by each of the plurality of sensors is smaller than an internal organ including a generation source of the biological signals.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a biological signal detection module and a biological signal detection system. [Background technology]

[0002] There is a known technology for detecting biosignals without requiring a subject to wear sensors or restraining the subject. Patent Document 1 describes a technology for detecting biosignals using multiple sensors arranged across a living body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2006 / 120754 [Patent Document 2] Japanese Patent Application Publication No. 2019-10436 Summary of the Invention [Problem to be solved by the invention]

[0004] When a single sensor comes into contact with a living body over a wide area, the signal-to-noise (S / N) ratio of the desired signal in the output signal deteriorates. Therefore, there has been a demand for technology that can measure biosignals over a narrow contact area close to the source of the biosignal. [Means for solving the problem]

[0005] The present disclosure has been made to solve the above-mentioned problems, and can be realized in the following forms.

[0006] According to one aspect of the present disclosure, there is provided a biosignal detection module (100) comprising: a plurality of sensors (110) for detecting biosignals of a person (HM) to be measured; and a support (120) on which the plurality of sensors are provided, the support being provided at a position in contact with the chest or back of the person to be measured on an article (300) that comes into contact with the upper body of the person, wherein the detection range of the biosignals of each of the plurality of sensors is smaller than an organ including a source of the biosignals.

[0007] According to this type of biosignal detection module, the biosignal can be measured in a narrow contact area near the source of the biosignal. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a biological signal detection system. [Figure 2] FIG. 2 is an explanatory diagram showing an example of an arrangement of a plurality of sensors. [Figure 3] 1 is a schematic diagram showing the configuration of a biological signal acquiring device 200. FIG. [Figure 4] FIG. 10 is an explanatory diagram showing an example of the arrangement of a plurality of sensors in the second embodiment. [Figure 5] FIG. 10 is a schematic diagram showing the configuration of a biological signal detection system according to a third embodiment. [Figure 6] FIG. 10 is an explanatory diagram of a biological signal detection module according to a fourth embodiment. [Figure 7] FIG. 10 is an explanatory diagram of a biological signal detection module according to a fifth embodiment. [Figure 8] FIG. 10 is an explanatory diagram of a biological signal detection module according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] A. First embodiment: The biosignal detection system 10 shown in FIG. 1 detects a biosignal of a subject HM. The biosignal is a signal indicating vibrations generated by the subject HM. In this embodiment, the biosignal is heart sounds of the heart HH, which include intermittent mechanical or acoustic vibrations in the heart HH of the subject HM, or ballistocardial vibrations, which are vibrations caused by the force of blood pumped by the heart HH. The mechanical or acoustic vibrations in the heart HH are caused by the opening and closing of the valves of the heart HH or the movement of blood flowing into or out of the heart HH. The heart sounds are sounds generated in conjunction with the beating of the heart HH and are elastic waves that propagate through a medium.

[0010] Under normal circumstances, heart sounds are periodic signals consisting of a first heart sound, which is generated when the left and right atrioventricular valves close at the beginning of ventricular systole, and a second heart sound, which is generated when the aortic and pulmonary valves close immediately after ventricular systole. Generally, the first heart sound is low-pitched and long, while the second heart sound is high-pitched and short. The period from the first to the second heart sound is the systole of the heartbeat heart rate (HH), and the period from the second heart sound to the first heart sound of the next cycle is the diastole of the heartbeat heart rate (HH). The period from the first to the next first heart sound or the period from the second to the next second heart sound corresponds to the heart rate interval (HRI), and the number of first or second heart sounds per minute corresponds to the heart rate.

[0011] The biosignal detection system 10 includes a biosignal detection module 100, a biosignal acquisition device 200, and a seat 300. The biosignal detection system 10 does not require that the subject HM is wearing clothing when acquiring a biosignal. FIG. 1 shows mutually orthogonal x-, y-, and z-axes. The x-axis is the height direction of the subject HM seated on the seat 300, and is the height direction of the support body 120 described below. The y-axis is the width direction of the subject HM seated on the seat 300, and is the width direction of the support body 120. The z-axis is the thickness direction of the subject HM seated on the seat 300, and is the thickness direction of the support body 120. These axes correspond to the axes shown in FIG. 1 and subsequent figures.

[0012] The biosignal detection module 100 is placed on the seat 300 and acquires a biosignal from the back HB of the subject HM who is seated on the seat 300. In this embodiment, the biosignal detection module 100 is embedded in a recess provided in the seat 300 and is fixed therein by friction with the material that constitutes the seat 300. The biosignal detection module 100 does not have to be embedded in the seat 300, and may be fixed to the front or back surface of the seat 300.

[0013] The biosignal detection module 100 may be manufactured integrally with the seat 300, or may be retrofitted to a ready-made product. In this disclosure, "retrofitted" means that it is not attached to or incorporated in the product when the product is manufactured or installed, but is attached or placed on the product regardless of the manufacture or use of the product.

[0014] In this embodiment, the subject HM is, for example, a driver sitting in seat 300, which serves as a driver's seat. Seat 300 is an example of an object that comes into contact with the upper body of the subject HM. Examples of "objects that come into contact with the subject's upper body" include various objects used for lying down, such as bedding, a bed, a futon, a sheet, a medical table, a hospital bed, a mat, a mattress, a floor, a fitted sheet, a bed pad, and a sofa bed, as well as various objects used for sitting, such as a chair, a legless chair, and a sofa. "Objects that come into contact with the subject's upper body" include furniture, medical equipment, and any object used for lying down or sitting, regardless of its purpose. Furthermore, "objects that come into contact with the subject's upper body" is not limited to the entire object, but also includes portions of the object, such as the back of a chair, a portion of the back, or a portion of a mattress.

[0015] 2, the biological signal detection module 100 of this embodiment includes a plurality of sensors 110 and a support body 120. Fig. 2 is a plan view of the biological signal detection module 100 when viewed along the thickness direction (z-axis direction) of the support body 120.

[0016] The sensor 110 detects a biosignal of the subject HM. In this embodiment, the sensor 110 is a piezoelectric sensor capable of outputting a vibration waveform including vibration as the biosignal. The width W1 of the sensor 110 is 4 cm. In this embodiment, the width W1 is the length in the width direction of the support 120, and is the diameter of the sensor 110. From the viewpoint of accurately detecting vibrations corresponding to the biosignal, the sensor 110 preferably has high sensitivity enough to detect minute signals, such as voltages in the μV range. In this embodiment, the frequency band of the biosignal detected by the sensor 110 is 10 Hz or more and 100 Hz or less.

[0017] Furthermore, the detection range of sensor 110 is smaller than that of the organ containing the source of the biological signal. An organ containing the source of the biological signal is an organ that includes the valves, tissues, and blood vessels that are the source of the biological signal. For example, the organ containing the source of heart sounds and ballistocardiograms is the heart HH, and the organ containing the source of vibrations associated with breathing is the lungs. In this embodiment, the detection range of sensor 110 is smaller than that of the heart HH.

[0018] The biosignal detected by the sensor 110 is input as an analog voltage signal of a vibration waveform to an AD converter (not shown) or the like, converted into a digital signal, and output to the biosignal acquisition device 200 by wired communication or wireless communication. The wireless communication can be realized, for example, by a wireless connection through a wireless local network (LAN) conforming to the IEEE802.11 standard or wireless communication using Bluetooth (registered trademark).

[0019] The support 120 is a member on which the multiple sensors 110 are provided. The support 120 is provided in a position on the seat 300 that contacts the chest or back HB of the person being measured HM. In this embodiment, the support 120 is a sheet-like member with a thickness of 1 mm. The support 120 is formed using, for example, silicone rubber, from the perspective of reducing the discomfort felt by the person being measured HM when the person being measured HM sits in the seat 300. By using thin silicone rubber as the support 120, it can be deformed to fit the shape of the body of the person being measured HM, thereby reducing the discomfort felt by the person being measured HM.

[0020] In this embodiment, the multiple sensors 110 are arranged on the support 120 at equal intervals in a 3x3 grid in the height direction (x-axis direction) and width direction (y-axis direction) of the support 120. The distance D1 between adjacent sensors 110 is 10 cm. This equal distance D1 does not necessarily have to be precise and may be considered to be substantially equal. This may be due to manufacturing or other inconsistencies. As a result, the distance D1 may be equal to within a range of approximately + / - 5%. Preferably, multiple sensors 110 are arranged in the biosignal detection module 100 at a position facing an organ containing a source of a biosignal. The lungs of an adult typically have a length of approximately 24 cm and a width of approximately 10 cm. The length and width of an adult heart typically are approximately 10 cm. Therefore, the distance D1 between adjacent sensors 110 is preferably 24 cm or less, which is the length of the organ containing the source of the biosignal, and more preferably 10 cm or less, which is the width of the organ containing the source of the biosignal. This increases the probability that each of the multiple sensors 110 can acquire a biological signal. In this embodiment, the length of the heart HH, which is an organ that includes the source of the biological signal, is the size in the length direction of the support body 120. Furthermore, the width of the heart HH is the size in the width direction of the support body 120.

[0021] 3 is a device that acquires a biosignal detected by a sensor 110. The biosignal acquisition device 200 is configured by a computer including an input / output interface 210, a storage unit 220 configured by ROM and RAM, and a CPU 230. The input / output interface 210, the storage unit 220, and the CPU 230 are connected to each other so as to be able to communicate bidirectionally.

[0022] The input / output interface 210 is connected to the biological signal detection module 100. The input / output interface 210 receives biological signals from the plurality of sensors 110 that the biological signal detection module 100 includes.

[0023] The CPU 230 executes a program pre-installed in the storage unit 220 to implement the functions of the noise detection unit 231 and the calculation unit 232. However, some or all of the functions of these units may be implemented by a hardware circuit.

[0024] The noise detection unit 231 detects noise in the biological signal. When the biological signal is heart sounds and ballistocardiograms, the noise is vibrations generated from a living organism, such as breathing, pulse, organ movements, fetal movements, and bodily movements (body movements), excluding the heart sounds and ballistocardiograms that are biological signals. The noise detection unit 231 detects, for example, amplitudes equal to or less than a predetermined threshold as noise. Note that the noise detection unit 231 may use a learning model generated by machine learning.

[0025] The calculation unit 232 calculates the period of the biological signal. The period of the biological signal is the period from one peak to the next peak when the period is plotted on a graph with the amplitude obtained by wavelet transforming the biological signal as the vertical axis and time as the horizontal axis. The period of the biological signal is, for example, the period from the first heart sound to the next first heart sound or the period from the second heart sound to the next second heart sound. In this embodiment, the calculation unit 232 calculates the period of the biological signal using the biological signal with the greatest intensity among the biological signals detected by the multiple sensors 110.

[0026] According to the biological signal detection system 10 in the first embodiment described above, The detection range of the biosignal of the sensor 110 mounted on the support 120, which is positioned in contact with the back HB of the subject HM, is smaller than the heart HH, which includes the source of the biosignal. Therefore, the biosignal can be measured in a narrow contact range near the source of the biosignal. This prevents the signal-to-noise ratio from deteriorating.

[0027] Furthermore, the multiple sensors 110, each having a width W1 of 4 cm, are arranged in a grid pattern, with the distance D1 between adjacent sensors 110 being 10 cm. More specifically, nine sensors 110 are arranged within a 24 cm square area. Because the heart HH, which is approximately 10 cm square and includes the source of the biological signal, is located within the 24 cm square area in which the sensors 110 are arranged, there is a high probability that the sensor 110 will be located near the heart HH, and the biological signal can be measured near the heart HH.

[0028] Furthermore, the calculation unit 232 calculates the period of the biological signal using the biological signal with the strongest intensity or the biological signal with the highest ratio to noise among the biological signals detected by the multiple sensors 110. This reduces the processing load in calculating the period of the biological signal.

[0029] B. Second embodiment: The second embodiment differs from the first embodiment in that the sensors 110 are not arranged at equal intervals in the support body 120 of the second embodiment shown in Fig. 4. The configuration of the biosignal detection system 10 of the second embodiment is the same as the configuration of the biosignal detection system 10 of the first embodiment, and therefore a description of the configuration of the biosignal detection system 10 will be omitted.

[0030] 4, the multiple sensors 110 are arranged more sparsely as they move away from a predetermined point RP. The multiple sensors 110 are arranged in a fan shape. The point RP is preferably located at a position facing the center of the heart HH in the z-axis direction.

[0031] The positional relationship between the sensor 110 and the heart HH varies depending on the physique of the subject HM. According to the biosignal detection system 10 in the second embodiment described above, the multiple sensors 110 are arranged more sparsely as they move away from the point RP. Therefore, if the subject HM has a small physique, the biosignal can be detected by the sensors 110 around the point RP. Furthermore, if the heart HH has a large physique, the biosignal can also be detected by the sensors 110 that are farther away from the point RP. Therefore, the biosignal can be detected depending on the subject HM without changing the installation position of the biosignal detection module 100.

[0032] C. Third embodiment: A biological signal detection system 10C of the third embodiment shown in FIG. 5 differs from the first embodiment in that it includes a noise sensor 400, but the other configurations are the same.

[0033] The noise sensor 400 is a sensor that detects a signal indicating vibration. In this embodiment, the noise sensor 400 is a piezoelectric sensor similar to the sensor 110. The noise sensor 400 is provided on the seat 300, on the side of the support 120 opposite the side where the seat 300 contacts the subject HM, in the thickness direction (z-axis direction) of the support 120. The noise sensor 400 is also provided at a position facing the sensor 110 in the thickness direction of the support 120. Therefore, it is highly likely that the amplitude of the biological signal detected by the noise sensor 400 will be smaller and at a later timing than the amplitude of the biological signal detected by the sensor 110.

[0034] In this embodiment, the noise detection unit 231 detects the first amplitude as noise when the timing of occurrence of the first amplitude in the biological signals detected by the multiple sensors 110 is later than the timing of occurrence of the second amplitude corresponding to the first amplitude in the signal detected by the noise sensor 400, or when the intensity of the first amplitude is smaller than the intensity of the second amplitude. The first amplitude can be determined arbitrarily by the noise detection unit 231.

[0035] According to the biological signal detection system 10C of the third embodiment described above, the noise detection unit 231 detects noise using the signal detected by the noise sensor 400. Therefore, the noise detection unit 231 can accurately detect noise when the noise source is located on the opposite side of the support 120 from the side where the seat 300 contacts the subject HM in the thickness direction of the support 120.

[0036] D. Fourth embodiment: 6 is different from the first embodiment in that the biological signal detection module 100 includes a plurality of covering portions 130. In this embodiment, the biological signal detection module 100 includes nine covering portions 130.

[0037] The covering portion 130 is a member that covers the portion of the sensor 110 that is not in contact with the support 120 without coming into contact with the sensor 110. Each covering portion 130 is provided for each sensor 110, and covers the corresponding sensor 110. The covering portion 130 has a substantially circular shape. It is preferable that the covering portion 130 has a shape similar to that of the sensor 110. In this embodiment, the covering portion 130 is a member made of metal. Note that resin or plastic may also be used as the covering portion 130.

[0038] The weight and inner diameter of the covering portion 130 determine the resonant frequency of the portion of the support body 120 covered by the covering portion 130. For example, the spring constant of the portion of the support body 120 covered by the covering portion 130 is determined by the inner diameter of the covering portion 130, and the resonant frequency is determined. The weight and inner diameter of the covering portion 130 can be determined arbitrarily according to the desired resonant frequency. The desired resonant frequency can be determined so as to amplify the vibration frequency to be acquired by the sensor 110. The resonant frequency may be determined so as to amplify frequencies that are highly likely to be biological signals, or so as to amplify frequencies that are low likely to be biological signals.

[0039] According to the biological signal detection system 10 in the fourth embodiment described above, the sensor 110 is covered with the covering portion 130, and therefore the sensor 110 can be protected. Furthermore, the resonant frequency of the portion of the support body 120 covered by the covering portion 130 can be controlled by the weight and inner diameter of the covering portion 130.

[0040] E. Fifth embodiment: The biological signal detection system 10 of the fifth embodiment shown in FIG. 7 differs from the first embodiment in that the biological signal detection module 100 includes a weight 140, but the other configurations are the same.

[0041] In this embodiment, the biosignal detection module 100 includes a plurality of weights 140. The weights 140 are provided on the support 120 without contacting the sensors 110. In this embodiment, the weights 140 are made of metal and are provided between the sensors 110. The weight of the weights 140 can be determined arbitrarily depending on the desired resonant frequency.

[0042] According to the biosignal detection system 10 of the fifth embodiment described above, the weight 140 is provided on the support 120, and therefore the resonant frequency of the support 120 including the weight 140 can be controlled by the weight of the weight 140.

[0043] F. Other Embodiments: (F1) In the above embodiment, the biosignal is a heart sound or a ballistocardiogram. However, the biosignal is not limited to this and may be any vibration generated from a living body, such as respiration or pulse.

[0044] (F2) In the above embodiment, the sensor 110 is a piezoelectric sensor with a width W1 of 4 cm. The sensor 110 is not limited to this, and may be a piezoelectric sensor of any width. The narrower the width of the biosignal detection module 100, the lower the probability of acquiring noise, and the worsening of the signal-to-noise ratio can be suppressed. However, the detection range of the biosignal detection module 100 becomes smaller, which may make it difficult to detect the biosignal. Therefore, it is preferable to appropriately select the width depending on the size of the organ containing the source of the biosignal and the magnitude of the biosignal to be acquired. Furthermore, the sensor 110 is not limited to a piezoelectric sensor, and various sensors 110 capable of detecting vibrations, such as an accelerometer, a diaphragm, or a microphone, can be used.

[0045] (F3) In the above embodiment, the sensor 110 is provided on an article that comes into contact with the chest or back HB of the person being measured HM. However, the sensor 110 does not have to be provided on an article that comes into contact with the chest or back HB of the person being measured HM.

[0046] (F4) In the above embodiment, the multiple sensors 110 are arranged in a grid pattern. This is not limiting, and the multiple sensors 110 may be arranged in any other manner. The multiple sensors 110 may be arranged, for example, in a concentric pattern. The multiple sensors 110 are preferably arranged such that the direction connecting the centers of the detection ranges of any two of the multiple sensors 110 intersects with the height direction (x-axis direction) of the support 120. This increases the likelihood that the sensors 110 will be arranged closer to the heart HH than when the multiple sensors 110 are arranged only in a linear fashion across the subject HM. Furthermore, the multiple sensors 110 are preferably arranged such that the direction connecting the centers of the detection ranges of any two of the multiple sensors 110 intersects with the width direction (y-axis direction) of the support 120. This increases the likelihood that the sensors 110 will be arranged closer to the heart HH than when the multiple sensors 110 are arranged only in a linear fashion across the subject HM.

[0047] (F5) In the above embodiment, the frequency band of the biological signal detected by the sensor 110 is 10 Hz or more and 100 Hz or less. This is not limiting, and the sensor 110 may detect a biological signal of any frequency band. When the biological signal is respiration, the frequency band detected by the sensor 110 is preferably 0.2 Hz or more and 0.5 Hz or less.

[0048] (F6) In the above embodiment, the support 120 is a silicone sheet-like member having a thickness of 1 mm. The support 120 is not limited to this, and may be a sheet-like member of any thickness. The support 120 preferably has a thickness of 0.5 mm or more and 20 mm or less. The support 120 may also be, for example, a concave resin member that forms an internal space for accommodating the sensor 110. In this case, the support 120 accommodates the sensor 110 and a catalyst other than a gas, such as a liquid, solid, or gel.

[0049] (F7) In the above-described embodiment, the support 120 may be provided with ventilation holes in areas where the sensor 110 is not provided. This can prevent the biological signal detection module 100 from deteriorating due to sweat, stuffiness, etc. Furthermore, even when the seat 300 blows air to the subject HM seated on the seat 300, it is possible to avoid the support 120 from interfering with the air blowing.

[0050] (F8) In the above embodiment, the calculation unit 232 calculates the period of the biological signal using the biological signal with the greatest intensity among the biological signals detected by the multiple sensors 110. This is not limiting, and the calculation unit 232 may calculate the period of the biological signal using, for example, the biological signal with the highest ratio to noise among the biological signals detected by the multiple sensors 110. Furthermore, the calculation unit 232 may calculate the period of the biological signal by averaging the periods of the biological signals detected by the multiple sensors 110.

[0051] (F9) In the first, second, and fourth embodiments, the biological signal detection system 10 may not include the noise detection unit 231. In this case, the calculation unit 232 calculates the period from the biological signal using, for example, a filter that is generated in advance and attenuates noise.

[0052] (F10) In the third embodiment, the noise sensor 400 is provided at a position facing the sensor 110 in the thickness direction (z-axis direction) of the support 120. However, the present invention is not limited to this, and the noise sensor 400 may be provided at a position not facing the sensor 110 in the thickness direction of the support 120. Furthermore, a plurality of noise sensors 400 may be provided in the surface direction of the support 120, or a plurality of noise sensors 400 may be provided in the thickness direction of the support 120.

[0053] (F11) In the fourth embodiment, the biosignal detection module 100 is provided with a covering section 130 for each sensor 110. However, the present invention is not limited to this, and for example, as shown in Fig. 8, the covering section 130 may be provided so as to cover all of the sensors 110 provided in the biosignal detection module 100. Since the area of the covering section 130 is increased, the pressure applied to the covering section 130 can be dispersed.

[0054] (F12) In the fifth embodiment, the weights 140 are provided between the sensors 110. However, the present invention is not limited to this, and the weights 140 may be provided at any position on the support 120. For example, the weights 140 may be provided on the outer periphery of the sensors 110.

[0055] The present disclosure is not limited to the above-described embodiments and can be realized in various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each aspect described in the Summary of the Invention section can be appropriately replaced or combined to solve the above-described problems or achieve some or all of the above-described effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted.

[0056] The biosignal acquisition device 200 and the method thereof described herein may be implemented by a special-purpose computer configured by configuring a processor and memory programmed to execute one or more functions embodied in a computer program. Alternatively, the noise detection unit 231 and the calculation unit 232 and the method thereof described herein may be implemented by a special-purpose computer configured by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the noise detection unit 231 and the calculation unit 232 and the method thereof described herein may be implemented by one or more special-purpose computers configured by combining a processor and memory programmed to execute one or more functions with a processor configured with one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by a computer on a computer-readable non-transitory tangible recording medium. [Explanation of symbols]

[0057] 10, 10C... Biological signal detection system, 100... Biological signal detection module, 110... Sensor, 120... Support body, 130... Covering part, 200... Biological signal acquisition device, 210... Input / output interface, 220... Memory part, 230... CPU, 231... Noise detection part, 232... Calculation part, 300... Seat, 400... Noise sensor

Claims

1. A biosignal detection module (100), comprising: A plurality of sensors (110) for detecting biosignals of a subject (HM); a support (120) on which the plurality of sensors are provided, the support being provided at a position in contact with the chest or back of the person being measured on an article (300) that comes into contact with the upper body of the person being measured; A biological signal detection module, wherein the detection range of the biological signal in each of the plurality of sensors is smaller than an organ including a source of the biological signal.

2. The biological signal detection module according to claim 1, A biological signal detection module in which the multiple sensors are arranged so that a direction connecting the centers of the detection ranges of any two of the multiple sensors intersects with the height direction of the support.

3. The biological signal detection module according to claim 1, A biological signal detection module in which the plurality of sensors are arranged so that a direction connecting the centers of the detection ranges of any two of the plurality of sensors intersects with the width direction of the support.

4. 4. The biological signal detection module according to claim 2 or 3, A biological signal detection module, wherein the distance between adjacent sensors among the plurality of sensors is equal to or less than the length of the organ.

5. The biological signal detection module according to claim 4, A biological signal detection module, wherein the spacing is equal to or less than the width of the organ.

6. The biological signal detection module according to claim 5, A biosignal detection module, wherein the plurality of sensors are piezoelectric sensors each having a width of 4 cm or less.

7. 4. The biological signal detection module according to claim 2 or 3, A biological signal detection module, wherein the plurality of sensors are arranged at equal intervals.

8. 4. The biological signal detection module according to claim 2 or 3, A biological signal detection module, wherein the plurality of sensors are arranged on the support in a sparser arrangement as they move away from a predetermined point.

9. The biological signal detection module according to claim 6, The thickness of the support is 0.5 mm or more and 20 mm or less.

10. The biological signal detection module according to claim 6, further comprising: A biological signal detection module comprising a weight provided on the support.

11. The biological signal detection module according to claim 6, further comprising: A biological signal detection module comprising a covering portion that covers portions of the plurality of sensors that are not in contact with the support without contacting the plurality of sensors.

12. A biosignal detection system (10) comprising the biosignal detection module according to claim 1, a noise detection unit (231) that detects noise in the biological signal; a noise sensor that is provided on the article on the opposite side of the support body from the side where the article comes into contact with the subject in the thickness direction of the support body and detects a signal; The noise detection unit When a timing of occurrence of a first amplitude of the biological signal detected by the plurality of sensors is later than a timing of occurrence of a second amplitude corresponding to the first amplitude in the signal detected by the noise sensor, Alternatively, the biological signal detection system detects the first amplitude as noise when the intensity of the first amplitude is smaller than the intensity of the second amplitude.

13. A biological signal detection system comprising the biological signal detection module according to any one of claims 1 to 3, A biological signal detection system comprising a calculation unit that calculates the period of the biological signal using the biological signal with the greatest intensity or the biological signal with the highest ratio to noise among the biological signals detected by the multiple sensors.

14. The biological signal detection module according to any one of claims 1 to 3, the biological signal is a heart sound or a ballistocardiogram; A biological signal detection module, wherein the frequency band of the biological signals detected by the plurality of sensors is 10 Hz or more and 100 Hz or less.

Images