Biological noise measuring device, operating procedure for biological noise measuring device and operating program for biological noise measurement

Abstract

Biological noise measuring device which features: a principal body (1; 1A; 1B) comprising: a first noise measuring instrument (M1) configured to measure a biological noise, a housing (31) which accommodates the first noise measuring instrument (M1) and which has an opening (31h) which, in a state in which the housing (31) is pressed against the body surface (S), is closed by a body surface (S) of a living body, a second noise measuring instrument (M2) provided outside the enclosure (31) and configured to measure ambient noise of the enclosure (31), and a control (4) which causes a noise generator (8) to produce a noise in a state in which the opening (31h) in the housing (31) is not closed, which determines, based on an intensity of the noise measured by the first noise measuring instrument (M1) and an intensity of the noise measured by the second noise measuring instrument (M2), whether a relationship between a measurement sensitivity of the first noise measuring instrument (M1) and a measurement sensitivity of the second noise measuring instrument (M2) satisfies a predetermined condition or not, and which, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument (M1) and / or the second noise measuring instrument (M2).

Description

Technical field

[0001] The present invention relates to a biological noise measuring device intended to be brought into contact with the body surface of a living body, an operating method for its use, and a program for its use. Background technology

[0002] A device is known which uses a microphone to extract a biological sound, such as a breathing sound as the sound of an airflow for ventilating the airway and alveoli, an adventitious sound which is an abnormal sound during respiration that is produced under pathological conditions, such as wheezing or pleural friction, or a heart murmur, as an electrical signal (see, for example, patent literature 1).

[0003] Patent literature 1 discloses an adhesive patch for measuring an acoustic signal from a human body. The adhesive patch comprises a first microphone for recording an acoustic signal from the body, a second microphone for recording an ambient noise signal, and removes noise detected by the first microphone from a signal based on a detection signal from the second microphone.

[0004] As disclosed in patent literature 1, in a case where two microphones are used to remove noise from an acoustic signal from the body, it is necessary to maintain the sensitivity of the two microphones to a state of the time at which the microphones were manufactured.

[0005] Patent references 2 and 3 disclose a sensitivity adjustment method for each microphone in an electronic device equipped with multiple microphones. In the sensitivity adjustment method, a sound generated by a loudspeaker is measured by several microphones, and the sensitivity of the multiple microphones is adjusted based on the measurement result.

[0006] Patent literature 4 relates to a heart sound detector which is intended to make it possible to detect heart sound signals in less ambient noise by processing ambient noise transmitted through viable tissue and detected by an ambient noise microphone and canceling it out by a cancellation noise that is emitted by a cancellation noise loudspeaker. Reference list patent literature Patent literature 1: JP 2011 - 505 997 A Patent literature 2: JP 2016 – 54 455 A Patent literature 3: JP 2013 - 219 444 A Patent literature 4: JP 2000 - 60 847 A Technical problem

[0007] In a case where multiple microphones are used to improve the measurement accuracy of a biological sound, as disclosed in patent literature 1, it is necessary to maintain the sensitivity ratio or sensitivity difference of the multiple microphones at a predetermined value. However, it is assumed that the sensitivity ratio or sensitivity difference of the multiple microphones may deviate from the value at the time the microphones were manufactured due to the operating environment, a long-term change, or similar factors in the device.

[0008] Therefore, it is effective to add a test function to a biological noise measurement device with multiple microphones so that it can be checked whether the sensitivity ratio or the sensitivity difference of the multiple microphones has a desired value.

[0009] As disclosed in patent literature 2 and 3, for example, a loudspeaker generating a test noise is provided in a device, and the sensitivity ratio or sensitivity difference can be determined based on the intensity of the test noise measured by each of the multiple microphones.

[0010] In a biological noise measuring device that measures biological noise in a state where it is in contact with the body surface of a living body, a noise measuring instrument for biological noise measurement is arranged in a space sealed by the body surface of the living body, and a noise measuring instrument for measuring ambient noise is arranged outside the space in a section not sealed by the body surface.

[0011] In a case where the test function described above is added to such a biological noise measuring device, it is necessary that the room in which the noise measuring instrument for the biological noise measurement is arranged be in a state where it is not sealed in order to allow the multiple noise measuring instruments to measure the test noise under the same condition.

[0012] Patent references 2 and 3 disclose that the sensitivity of the multiple microphones is adjusted. However, the multiple microphones are not used to measure biological sounds, and there is no detection of the problems described above.

[0013] The present invention was made in view of the foregoing circumstances, and its object is to provide a biological noise measuring device, an operating method for the biological noise measuring device and an operating program for the biological noise measuring device which are capable of reducing a decrease in measurement accuracy in a case of measuring a biological noise using several noise measuring instruments. Summary of the invention; Solution to the problem (1) A biological noise measuring device comprising: a main body that includes: a first noise measuring instrument configured to measure a biological noise, a housing which contains the first noise measuring instrument and which has an opening which, in a state in which the housing is pressed against the body surface, is closed by a body surface of a living body, a second noise measuring instrument, provided outside the enclosure and configured to measure ambient noise from the enclosure, and a control that causes the noise generator to produce a noise in a state where the opening in the housing is not closed, that determines, based on an intensity of the noise measured by the first noise measuring instrument and an intensity of the noise measured by the second noise measuring instrument, whether a relationship between a measurement sensitivity of the first noise measuring instrument and a measurement sensitivity of the second noise measuring instrument satisfies a predetermined condition or not, and that, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument and / or the second noise measuring instrument.

[0014] Since, according to this configuration, the noise is generated by the noise generator in a state where the opening in the housing is not closed, it is possible to measure the noise with the first and second noise measuring instruments under essentially the same conditions. Consequently, it is possible to determine with high accuracy whether a relationship between the measurement sensitivity and the noise level is met. If the condition is not met, for example, a report will be generated indicating that the measurement accuracy of the biological noise cannot be guaranteed. Therefore, it is possible to prevent the measurement of the biological noise from being performed in a state where the condition is not met, thus preventing a reduction in measurement accuracy.Alternatively, if the condition is not met, the measurement sensitivity of the first noise measuring instrument and the measurement sensitivity of the second noise measuring instrument are adjusted to meet the condition. Therefore, it is possible to prevent the measurement of biological noise from being carried out in a state where the condition is not met, and a decrease in the measurement accuracy of the biological noise can be prevented. (2) The biological noise measuring device according to (1), which further comprises: a cover element which covers the housing and the second noise measuring instrument in the state in which the opening in the housing is not closed and which is removable in relation to the main body, wherein the noise generator is arranged in a position which, in a state in which the cover element is attached to the main body, is covered by the cover element, and where, when the control system detects the fastening of the cover element, it determines that it is in the state where the opening in the housing is not closed.

[0015] According to this configuration, the way the cover element is attached makes it less likely that external noise will reach the inside of the cover element. Therefore, it is possible to prevent any noise other than that generated by the noise generator from being measured by the first and second noise measuring instruments, and it is possible to determine with high accuracy whether the measurement sensitivity relationship meets the condition or not.

[0016] (3) The biological noise measuring device according to (2), wherein the cover element is made of a material that prevents the transmission of a noise which the first noise measuring instrument and the second noise measuring instrument can measure.

[0017] According to this configuration, the way the cover element is attached makes it far less likely that external noise will reach the inside of the cover element. Therefore, it is possible to determine with high accuracy whether the measurement sensitivity relationship meets the condition.

[0018] (4) The biological measuring device according to (3), wherein the control system detects that the cover element is attached when the intensity of an external noise measured by the first noise measuring instrument or the second noise measuring instrument is less than or equal to a first threshold value.

[0019] Since this configuration eliminates the need for a special sensor or similar device to detect the attachment of the cover element, it is possible to reduce the size and cost.

[0020] (5) The biological noise measuring device according to one of (2) to (4), the noise generator is provided in the cover element.

[0021] Since the noise generator is provided in the cover element according to this configuration, it is possible to reduce the size of the main body.

[0022] (6) The biological noise measuring device according to one of (2) to (4), the main body further includes the noise generator.

[0023] Since the noise generator is provided in the main body according to this configuration, the control unit can easily control the noise generator, and manufacturing costs can be reduced.

[0024] (7) The biological noise measuring device according to (1), wherein the control causes the noise generator to produce the noise when the intensity of a peripheral noise measured by the first noise measuring instrument or the second noise measuring instrument is less than or equal to a pre-defined second threshold, and the condition exists in which the opening of the housing is not closed.

[0025] According to this configuration, the above determination can be carried out in a state where the device is located in a quiet environment. Therefore, this determination can be carried out with high accuracy.

[0026] (8) The biological noise measuring device according to (1) or (7), the main body further includes the noise generator.

[0027] According to this configuration, the controller can easily control the noise generator and manufacturing costs can be reduced.

[0028] (9) A method for operating a biological sound-measuring device comprising: a first sound-measuring instrument configured to measure a biological sound, a housing containing the first sound-measuring instrument and having an opening which, when the housing is pressed against the body surface, is closed by a body surface of a living body, and a second sound-measuring instrument provided outside the housing and configured to measure an ambient sound of the housing, wherein the method comprises: a step which causes a noise generator, in a state where the opening of the housing is not closed, to produce a noise which, based on an intensity of the noise measured by the first noise measuring instrument and an intensity of the noise measured by the second noise measuring instrument, determines whether a relationship between a measurement sensitivity of the first noise measuring instrument and a measurement sensitivity of the second noise measuring instrument satisfies a predetermined condition or not, and, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument and / or the second noise measuring instrument.

[0029] (10) A program for operating a biological noise-measuring device comprising: a first noise-measuring instrument configured to measure a biological noise, a housing containing the first noise-measuring instrument and having an opening which, when the housing is pressed against a body surface, is closed by the body surface of a living body, and a second noise-measuring instrument provided outside the housing and configured to measure an ambient noise of the housing, wherein the program causes a computer to perform the following step: Causing the noise generator to produce a noise in a state where the opening in the housing is not closed, based on an intensity of the noise measured by the first noise measuring instrument and an intensity of the noise measured by the second noise measuring instrument. Determining whether a relationship between a measurement sensitivity of the first noise measuring instrument and a measurement sensitivity of the second noise measuring instrument satisfies a predetermined condition or not, and, if it is determined that the relationship does not satisfy the condition, indicating that it is unable to ensure the measurement accuracy of the biological noise, or adjusting the measurement sensitivity of the first noise measuring instrument and / or the second noise measuring instrument. Advantageous results of the invention

[0030] According to the present invention, it is possible to provide a biological noise measuring device, an operating method for the biological noise measuring device, and a program for the operation of the biological noise measuring device, which are capable of improving a reduction in measurement accuracy in a case of measuring a biological noise using several noise measuring instruments. Brief description of the drawings Fig. Figure 1 is a side view showing a schematic configuration example of a main body 1 of a biological noise measuring device 100. Fig. 2 is along a line AA in Fig. 1. Schematic cross-sectional view of the main body 1. Fig. Figure 3 is a schematic view of a schematic configuration of a recording housing 10, in which the in Fig. 1 depicted main body 1 is included. Fig. Figure 4 is a schematic cross-sectional view of the receiving housing 10 in a state in which the main body 1 is received. Fig. Figure 5 is a flowchart illustrating an operating example of the biological noise measuring device 100 in a test operating mode. Fig. Figure 6 is a schematic cross-sectional view of a biological noise measuring device 100A as a modification of the biological noise measuring device 100. Fig. Figure 7 is a side view of a biological noise measuring device 100B as a modification of the biological noise measuring device 100. Fig. Figure 8 is a schematic view showing a schematic configuration of a biological noise measuring device 100C as a fourth modification of the biological noise measuring device 100. Fig. 9 is along a line BB in Fig. 8. Schematic cross-sectional view of the biological noise measuring device 100C. Fig. 10 is a flowchart illustrating an operational example of the in Fig. 8 shown biological noise measuring device 100C in a test operating mode. Description of embodiments (overview of the biological noise measuring device of the embodiment)

[0031] First, an overview of an embodiment of a biological sound-measuring device of the present invention is described. The biological sound-measuring device of this embodiment measures lung sounds (a breath sound and an adventitious sound) as an example of a biological sound from a living human body, and if it is determined that wheezing is present in a measured sound, the biological sound-measuring device reports this. In this way, the device assists in determining whether or not the subject should be given medication, whether the subject should be taken to a hospital, or in making a diagnosis for the subject by a physician.

[0032] The biological noise-measuring device according to the embodiment comprises a main body containing a first noise-measuring instrument for measuring lung sounds, a second noise-measuring instrument for measuring ambient noise, and a noise generator for producing a test noise. The biological noise-measuring device measures the lung sounds of a living body using the first noise-measuring instrument by sealing a space containing the first noise-measuring instrument with a body surface. The noise-measuring instrument is used, for example, to remove noise that is present in the sound measured by the first noise-measuring instrument, other than the lung sounds.

[0033] In the main body of the biological noise measuring device according to the embodiment, a test noise is generated by the noise generator in a state where the space in which the first noise measuring instrument is located is not sealed by the body surface. Furthermore, based on the intensity of the test noise measured by the first noise measuring instrument and the intensity of the test noise measured by the second noise measuring instrument, it is determined whether a relationship between the measurement sensitivity of the first noise measuring instrument and the measurement sensitivity of the second noise measuring instrument satisfies a predefined condition. If it is determined that the relationship does not satisfy the condition, a notification is issued or the measurement sensitivity of the first noise measuring instrument and / or the second noise measuring instrument is adjusted.

[0034] The notification will contain, for example, a notification that no wheezing could be detected, a notification to stop the measurement of biological noise, and a request to repair the device. Furthermore, the sensitivity of the first and / or second noise measuring instrument will be adjusted so that the aforementioned condition is met.

[0035] Even if, during this processing, a measurement sensitivity ratio or difference deviates from a value at the time the sound-measuring instruments were manufactured, the measurement sensitivity ratio or difference is corrected, or the measurement of lung sounds is prevented. Therefore, it is possible to prevent lung sound measurements from being performed in a state where the measurement sensitivity ratio or difference deviates from a desired value, and it is possible to prevent a reduction in the measurement accuracy of the lung sound.

[0036] Below is a specific configuration example of the biological noise measurement device of the embodiment. (Form of execution)

[0037] As in Fig. Figure 4 shows a biological noise measuring device 100 according to an embodiment of the biological noise measuring device of the present invention described below, comprising a main body 1 and a receiving chamber 10 for receiving the main body 1.

[0038] Fig. Figure 1 is a side view showing a schematic configuration example of a main body 1 of a biological noise measuring device 100. As in Fig. As shown in Figure 1, the main body 1 has a rod-like handle section 1b formed from a housing made of resin, metal or the like, and a head section 1a is provided on one end side of the handle section 1b.

[0039] Inside the handle section 1b are a control unit 4, which controls the entire biological sound measuring device 100, a battery 5, which supplies the voltage necessary for operation, and a display unit 6, which displays an image via a liquid crystal display, an organic electroluminescent (EL) display, or similar. At the other end of the handle section 1b is a terminal block 7 for electrical connection to a receiving housing 10, which will be described later.

[0040] The controller 4 comprises a central processing unit (CPU), random access memory (RAM), read-only memory (ROM), and similar components, and controls the hardware of the biological noise measuring device 100 according to a program. Programs, including a program for operating the biological noise measurement, are stored in the ROM of the controller 4.

[0041] The head section la is equipped with a measuring unit 3, which points towards one side (a bottom side in Fig. 1) projects in a direction substantially orthogonal to a longitudinal direction of the handle section 1b, and is provided with a noise generator 8. At a tip end of the measuring unit 3, a pressure receiving section 3a is provided, which is to be brought into contact with a body surface S of a living body, which is a test subject, in order to receive a pressure from the body surface S.

[0042] When using the main body 1, a user, for example, places an index finger of his hand Ha on a rear surface of the measuring unit 3 in the head section 1a and presses the pressure receiving section 3a of the measuring unit 3 against the body surface S with the index finger.

[0043] Fig. 2 is along a line AA in Fig. 1. Schematic cross-sectional view of the main body 1.

[0044] As in Fig. As shown in Figure 2, the measuring unit 3 comprises a first noise measuring instrument M1, which measures a noise; a cylindrical housing 31 with a base, which receives the first noise measuring instrument M1 in a receiving chamber SP1 and which has an opening 31h that is closed by the body surface S when the housing is pressed against the body surface S; a housing cover 32, which closes the opening 31h from an outside of the first housing 31 and which covers the first housing 31; a second noise measuring instrument M2, which measures a noise; and a second housing 34, which forms a receiving chamber SP2 for receiving the second noise measuring instrument M2 and which has an opening 34h.

[0045] The measuring unit 3 is fitted into an opening section formed in a housing 2 which forms the head section 1a, with part of the housing cover 32 exposed, and is attached to the housing 2.

[0046] A tip end section of the portion of the housing cover 32 exposed by the housing 2 is a flat surface or a curved surface, and this flat surface or curved surface forms the pressure-receiving section 3a. The housing 2 is made of resin or the like, which is capable of transmitting sound.

[0047] The first sound measuring instrument M1 is configured to measure lung sound as a biological sound and is configured, for example, with a microelectromechanical system (MEMS) microphone or a capacitance microphone that measures sound in a frequency band (for example, a frequency range of 10 Hz or more and 10 kHz or less) that is wider than a frequency range of the lung sound (generally 10 Hz or more and 1 kHz or less).

[0048] The first noise measuring instrument M1 is connected to the in by a wire or similar (not shown) Fig. The control unit shown in 1 is electrically connected and transmits information about a measured noise to the control unit 4.

[0049] At the time of use of the main body 1, a condition is established in which the pressure-receiving section 3a of the housing cover 32 comes into contact with the body surface S and the receiving chamber SP1 is sealed via the housing cover 32 under a pressure from the body surface S through the body surface S (hereafter this condition is referred to as a sealed condition).

[0050] Furthermore, if the pressure recording section 3a vibrates due to the lung sound transmitted from the living body to the body surface S, an internal pressure of the recording chamber SP1 fluctuates due to this vibration, and an electrical signal corresponding to the lung sound is measured by the first sound measuring instrument M1 based on the fluctuation of the internal pressure.

[0051] The first case 31 has an essentially convex shape, which in Fig. 2 is directed downwards and is made of a material with a higher acoustic impedance than air and higher stiffness, such as a resin or a metal. The first housing 31 is made of a material that reflects a sound in a measurement frequency band of the first noise measuring instrument M1, so that the sound is not transmitted from the outside into the recording chamber SP1 when sealed.

[0052] The housing cover 32 is a cylindrical element with a base, and a shape of its hollow section essentially coincides with a shape of an outer wall of the first housing 31.

[0053] The housing cover 32 is made of a material with an acoustic impedance close to that of the human body, air, or water, and with good flexibility and biocompatibility. For example, silicon, an elastomer, or a similar material is used for the housing cover 34.

[0054] The second noise measuring instrument M2 is configured to measure an ambient noise of the first housing 31 (an ambient noise such as human speech or a noise caused by friction between the human body 1 and the living body or clothing) and is configured, for example, with a MEMS microphone or a capacitive microphone that measures noise in a band (for example, a frequency range of 10 Hz or more and 10 kHz or less) that is wider than the frequency range of lung noise.

[0055] The second noise measuring instrument M2 is connected to the one in the Fig. The control unit shown in 1 is electrically connected and transmits information about a measured noise to the control unit 4.

[0056] The second noise measuring instrument M2 is attached to a surface of the first housing 31 opposite the pressure-sensing section 3a. A circumference of the second noise measuring instrument M2 is covered by the second housing 34. The second housing 34 is made of a material (for example, a resin) that allows noise generated around the main body 1 to easily enter the receiving chamber SP2 to receive the second noise measuring instrument M2.

[0057] The opening 34h is formed in the second housing 34. Therefore, a structure is formed in which the noise generated around the main body 1 easily enters the recording chamber SP2 from the opening 34h.

[0058] Although in the example of Fig. 2. Since the second noise measuring instrument M2 is provided in the measuring unit 3, the installation location is not specifically restricted as long as the noise measured around the first housing 31 can be measured. For example, the second noise measuring instrument M2 can be provided at a location on the handle section 1b other than the head section 1a, where it is unlikely that the user will touch it during use.

[0059] The noise generator 8, which is located in the Fig. The main body 1 shown in Figure 1 is provided by the control unit 4 and generates a noise as a test noise in a frequency band that the first noise measuring instrument M1 and the second noise measuring instrument M2 can each measure. The noise generator 8 can be of any type as long as it can convert an electrical signal into physical vibrations, and various types of loudspeakers can be used, for example.

[0060] Fig. Figure 3 is a schematic view of a schematic configuration of a recording housing 10, in which the in Fig. 1 depicted main body 1 is included. Fig. Figure 4 is a schematic cross-sectional view of the receiving housing 10 in a state in which the main body 1 is received.

[0061] The receiving housing 10 comprises a base 11 and a cylindrical lid 12 with bottom, which is detachably attached to the base 11.

[0062] The base 11 is provided with: a display unit 13 which displays an image through a liquid crystal display field, an organic EL display field or the like, a recessed section 14 which serves to hold the main body 1, wherein the other end of the handle section 1b of the main body 1 is inserted therein, a terminal block 15 which is provided on a bottom section of the recessed section 14, a contact sensor 16 for detecting the contact between the base 11 and the cover 12 and a wiring 17.

[0063] As in Fig. As shown in Figure 4, the terminal block 15 of the base 11 is electrically connected to the terminal block 7 of the main body 1 in a state in which the skin body 1 is inserted into the recessed section 14.

[0064] As in Fig. As shown in Figure 3, terminal block 15 is connected to the display unit 13 and the contact sensor 16 via wiring 17. Consequently, when the main body 1 is inserted into the recessed section 14, an output signal from the contact sensor 16 is transmitted to the control unit 4 of the main body 1 via wiring 17, terminal block 15, and terminal block 7. For example, the contact sensor 16 is configured with a piezoelectric element and transmits a fastening detection signal to the control unit 4 when the cover 12 is attached to the base 11.

[0065] In the state in which the main body 1 is inserted into the recessed section 14, the control unit 4 of the main body 1 controls the display unit 13 via the terminal block 7, the terminal block 15 and the wiring 17.

[0066] As in Fig. Figure 4 shows a state in which the main body 1 is inserted into the recessed section 14 and held by the base 11, and the cover 12 is attached to the base 11 (in other words, a state in which the receiving housing 10 is attached to the main body 1), the main body 1 is arranged in a receiving space SP3 which is surrounded by an inner wall of the cover 12 and the base 11.

[0067] In this state, the pressure receiving section 3a of the measuring unit 3 is as shown in Fig. As shown in Figure 4, the measuring unit 3 is not in contact with the inner wall of the cover 12, and the opening 31h in the first housing 31 of the measuring unit 3 is not closed. The noise generator 8 of the main body 1 is arranged on an inner side of the recording housing 10 (in the recording chamber SP3).

[0068] In this way, when the receiving housing 10 is attached to the main body 1, it does not close the opening 31h in the first housing 31 of the main body 1 and covers the first housing 31 and the second noise measuring instrument M2. The receiving housing 10 forms a cover element.

[0069] Although the material of the base 11 and the cover 12 of the recording housing 10 is not specifically limited, the material is preferably a material that prevents noise from outside the recording housing 10 from entering the recording space SP3.

[0070] For example, the material of the base 11 and the cover 12 of the recording housing 10 is preferably a material capable of preventing the transmission of noise in a frequency band that the first noise measuring instrument M1 and the second noise measuring instrument M2 can each measure (whereby the noise is reflected in the frequency band). Such a material could be, for example, SUS or a rubber such as silicone or urethane.

[0071] The main body 1 of the biological sound measuring device 100 has a measuring mode in which lung sounds are measured to determine the presence or absence of wheezing (wheezing detection is performed). In this measuring mode, the controller 4 determines, based on the first sound measured by the first sound measuring instrument MI and the sound measured by the second sound measuring instrument M2, whether wheezing is included in the lung sound or not.

[0072] For example, control 4 removes noise, except for lung sounds, which are mixed into the first sound measured by the first sound measuring instrument M1, based on the second sound measured by the second sound measuring instrument M2. Furthermore, control 4 determines that "wheezing is present" if, for example, the first sound after noise removal has an intensity greater than or equal to an intensity at which a sound can be identified as wheezing.

[0073] Alternatively, in a case where the intensity of the first noise measured at a certain time is at a value that causes the first noise to be considered as wheezing, control 4 refers to the second noise measured at that time and determines, if the intensity of the second noise is high, that the influence of an external noise is high, and determines that there is no wheezing at that time.

[0074] To ensure the accuracy in determining the presence or absence of wheezing, a measurement sensitivity SM1 and a measurement sensitivity SM2 are predetermined at the time of manufacture of the biological noise measuring device 100, such that the relationship between the measurement sensitivity SM1 of the first noise measuring instrument M1 and the measurement sensitivity SM2 of the second noise measuring instrument M2 fulfills a predetermined condition. The measurement sensitivity of the noise measuring instrument refers to the ratio of an analog output voltage value or a digital output value of the second noise measuring instrument to an input sound pressure level.

[0075] The relationship is, for example, a ratio of the measurement sensitivity SM1 and the measurement sensitivity SM2, or a difference between the measurement sensitivity SM1 and the measurement sensitivity SM2.

[0076] The condition is, for example, that the ratio falls within a predetermined range, or that the difference falls within a predetermined range.

[0077] As described above, the measurement sensitivity SM1 of the first noise measuring instrument M1 and the measurement sensitivity SM2 of the second noise measuring instrument M2 may deviate from the values ​​established at the time of manufacture of the biological noise measuring device 100 due to deterioration over time or similar reasons.

[0078] Therefore, in addition to the measurement mode described above, the main body 1 of the biological noise measuring device 100 has a test mode in which the relationship between the measurement sensitivity of the first noise measuring instrument M1 and the measurement sensitivity of the second noise measuring instrument M2 is tested.

[0079] In this test mode, the controller 4 determines whether the opening 31h in the first housing 31 is in a state in which it is not closed, and if it is determined that it is in this state, it causes the noise generator 8 to produce a test noise.

[0080] When the main body 1 of the biological noise measuring device 100 is received in the receiving housing 10 (in other words, when the receiving housing 10 is attached to the main body 1), the opening 31h in the first housing 31 is in the open state. Therefore, when it is detected that the receiving housing 10 is attached to the main body 1, the controller 4 determines that the opening 31h in the first housing 31 is in the open state and causes the noise generator 8 to produce a test noise.

[0081] When a contact detection signal is received from the contact sensor 16, the controller 4 detects that the receiving housing 10 is attached to the main body 1.

[0082] After the noise generator 8 is caused to produce the test noise, the controller 4, in test mode, determines, based on an intensity m1 of the test noise measured by the first noise measuring instrument M1 and an intensity m2 of the test noise measured by the second noise measuring instrument M2, whether the relationship between the measurement sensitivity SM1 and the measurement sensitivity SM2 satisfies the above condition or not, and executes the control accordingly.

[0083] If it is determined that the relationship does not satisfy the condition, the controller 4, as the controller corresponding to the determination result, performs, for example, a control action to notify the user that the measurement accuracy of the biological sound cannot be guaranteed. For example, the controller 4 performs the notification by causing the display unit 13 of the recording housing 10 to display a message that wheezing detection is not possible, a message to stop the lung sound measurement and request that the device be repaired, or something similar.

[0084] A loudspeaker can be mounted on the receiving housing 10, and notification can be effected by playing these messages through the loudspeaker. Alternatively, the main body 1 and an electronic device, such as a smartphone, can be configured to communicate with each other. A message can be transmitted from the controller 4 to the electronic device, and the message can be displayed or output audio using a display or loudspeaker on the electronic device.

[0085] Alternatively, the light-emitting diode (LED) can be mounted, for example, on the receiving housing 10, and if it is determined that the relationship does not meet the condition, the controller 4 can notify the user that the measurement accuracy cannot be guaranteed by causing the LED to emit, for example, red light.

[0086] If it is determined that the relationship does not meet the condition, the controller 4, as the controller corresponding to the determination result, can adjust the measurement sensitivity SM1 and / or the measurement sensitivity SM2 so that the relationship meets the condition.

[0087] In this case, the controller 4 performs the adjustment of the measurement sensitivity SM1 by adjusting the gain of an amplifier mounted on the first noise measuring instrument M1 and performs the adjustment of the measurement sensitivity SM2 by adjusting the gain of an amplifier mounted on the second noise measuring instrument M2. (Operating example of the biological noise measuring device 100)

[0088] Fig. Figure 5 is a flowchart illustrating an operating example of the biological noise measuring device 100 in a test operating mode.

[0089] When the test operating mode is set, the controller 4 determines whether the receiving housing 10 is attached to the main body 1 or not (step S 1), and if the receiving housing 10 is attached to the main body 1 (step S1: Yes), the controller 4 causes the noise generator 8 to produce a test noise (step S2).

[0090] If the receiving housing 10 is not attached to the main body 1, the controller 4 repeats the processing of step S1. If a time period over which it is determined that the receiving housing 10 is not attached to the main body 1 is greater than or equal to a predetermined time period, the controller 4 can cause the display unit 6 of the main body 1 to display a message to instruct the main body 1 to be received in the receiving housing 10 and to notify the user.

[0091] When the test noise is generated in step S2, the test noise is measured by both the first noise measuring instrument M1 and the second noise measuring instrument M2 (step S3).

[0092] After the test noise is measured in step S3, the controller 4 obtains an intensity m1 of the test noise, measured by the first noise measuring instrument M1, and an intensity m2 of the test noise, measured by the second noise measuring instrument M2, calculates the measurement sensitivity SM1 based on the intensity m1 and an intensity m2 of the test noise, and calculates the measurement sensitivity SM2 based on the intensity m2 and the intensity of the measurement noise (step S4).

[0093] Next, the controller 4 obtains a ratio or difference between the measurement sensitivity SM1 and the measurement sensitivity SM2, which are calculated in step S4, and determines whether the ratio or difference is within a predefined range (specified range) or not (step S5).

[0094] If the ratio or difference is within the predefined range (step S5: Yes), the controller 4 notifies the user that the detection of wheezing is possible by causing the display unit 13 of the recording housing 10 to show this (step S6).

[0095] If the ratio or difference is outside the predefined range (step S5: No), the controller 4 notifies the user that the detection of wheezing is not possible by causing the display unit 13 of the recording housing 10 to show this (step S7).

[0096] As described above, in step S7 the controller 4 can adjust the sensitivity of the first noise measuring instrument M1 and / or the second noise measuring instrument M2 so that the relationship between the measurement sensitivity SM1 and the measurement sensitivity SM2, calculated in step S4, satisfies the condition, and then perform the processing of step S6. (Results of the biological noise measuring device 100)

[0097] As described above, according to the biological noise measuring device 100, in test mode, a test noise is generated by the noise generator 8 in a state where the opening 31h in the first housing 31 is not closed. Therefore, the test noise can be measured by the first noise measuring instrument M1 and the second noise measuring instrument M2 under essentially the same conditions. Consequently, it is possible to determine precisely whether the relationship between the measurement sensitivity of the first noise measuring instrument M1 and the measurement sensitivity of the second noise measuring instrument M2 satisfies the condition or not.

[0098] If this condition is not met, a notification will be sent, for example, stating that wheezing cannot be recorded, a notification to stop using the device and request its repair, or something similar. Therefore, it is possible to prevent lung sound measurements from being taken when this condition is not met, and thus a reduction in the accuracy of the lung sound measurement can be prevented.

[0099] If this condition is not met, the measurement sensitivity of the first sound measuring instrument M1 and the measurement sensitivity of the second sound measuring instrument M2 are alternatively adjusted so that they meet the condition. Therefore, it is possible to prevent the lung sound measurement from being performed in a state where the condition is not met, and thus it is possible to prevent a reduction in the measurement accuracy of the lung sound.

[0100] When, according to the biological noise measuring device 100, the main body 1 is received in the receiving housing 10, it is less likely that any external noise other than the test noise generated by the noise generator 8 will reach the first noise measuring instrument M1 and the second noise measuring instrument M2, which are mounted on the main body 1.

[0101] Therefore, it is possible to prevent any noise other than the test noise generated by the noise generator 8 from entering the first noise measuring instrument M1 and the second noise measuring instrument M2, and to determine in step S5 of Fig. 5 can be performed with high accuracy.

[0102] If the material of the base 11 and the cover 12 of the recording housing 10 is a material capable of preventing the transmission of noise in a frequency band that the first noise measuring instrument M1 and the second noise measuring instrument M2 can each measure, the following results can be obtained.

[0103] This means that in a state where the main body 1 is received in the receiving housing 10, the first noise measuring instrument M1 and the second noise measuring instrument M2, which are mounted on the main body 1, can only measure the test noise generated by the noise generator 8. Therefore, the determination in step S5 of Fig. 5 can be carried out with much higher accuracy. (Modification of the biological noise measuring device 100)

[0104] Modifications to the biological noise measuring device 100 are described below. <Erste Modifikation>

[0105] In this modification, it is assumed that the material of the base 11 and the cover 12 of the recording housing 10 is a material capable of preventing the transmission of noise in a frequency band that the first noise measuring instrument M1 and the second noise measuring instrument M2 can each measure.

[0106] In this configuration, the controller 4 can detect, based on the intensity of a noise measured by the first noise measuring instrument M1 or the second noise measuring instrument M2, that the recording housing 10 is attached to the main body 1.

[0107] For example, the control 4 in step S1 of Fig. 5 cause the first noise measuring instrument M1 or the second noise measuring instrument M2 to start measuring a noise, and detect that the recording housing 10 is attached to the main body 1 when an intensity of the noise measured by the first noise measuring instrument M1 or the second noise measuring instrument M2 is less than or equal to a first threshold value that is predetermined.

[0108] When the recording housing 10 is attached to the main body 1 in the first modification, external noise barely reaches the first noise measuring instrument M1 and the second noise measuring instrument M2. Therefore, the intensity of the noise measured by each of the first noise measuring instrument M1 and the second noise measuring instrument M2 is significantly reduced compared to when the main body 1 is outside the recording chamber SP3 of the recording housing 10. Consequently, if the intensity of the noise measured by the first noise measuring instrument M1 or the noise measured by the second noise measuring instrument M2 is less than or equal to the first threshold value, it can be determined that the recording housing 10 is attached to the main body 1. (Results of the first modification)

[0109] Since the contact sensor 16 can be omitted from the receiving housing 10 according to the first modification, it is possible to reduce the cost of the receiving housing 10. Furthermore, if the contact sensor 16 is omitted, the number of connections on the terminal block 7 of the controller 4 can also be reduced, and the size and cost of the main body 1 and the receiving housing 10 can be reduced. <Zweite Modifikation>

[0110] In the biological noise measuring device 100, the noise generator 8 is provided in the main body 1. However, the noise generator 8 can also be provided in the receiving housing 10. This is described in detail below.

[0111] Fig. Figure 6 is a schematic cross-sectional view of a biological noise measuring device 100A as a modification of the biological noise measuring device 100. The in Fig. The biological noise measuring device shown in Figure 6 is obtained by changing the main body 1 in the biological noise measuring device 100 to a main body 1A and changing the recording housing 10 to a recording housing 10A.

[0112] The hardware configuration of the main body 1A is the same as that of the main body 1, except that the noise generator 8 is omitted.

[0113] The hardware configuration of the recording housing 10A is the same as that of the recording housing 10, except that the noise generator 8 is provided on the base 11, and that the noise generator 8 and the terminal block 15 are connected by a (not shown) wiring.

[0114] The noise generator 8 of the recording housing 10A is positioned in the recording chamber SP3 between the base 11 and the cover 12 in a state where the cover 12 is attached to the base 11. The noise generator 8 is controlled by the control unit 4 of the main body 1A in the same way as in the biological noise measuring device 100. (Results of the biological noise measuring device 100A)

[0115] According to the biological noise measuring device 100A, the noise generator 8 is positioned in the recording chamber SP3 between the base 11 and the cover 12, with the main body 1A enclosed in the receiving housing 10. Therefore, similar to the biological noise measuring device 100, it can be determined with high accuracy whether the relationship between the measurement sensitivity SM1 and the measurement sensitivity SM2 is satisfied or not. Furthermore, since the noise generator 8 is mounted on the receiving housing 10A, a reduction in the size of the main body 1A is possible. <Dritte Modifikation>

[0116] The biological noise measuring device 100 is configured to maintain an environment (a state in which the opening 31h is not closed and ambient noise is isolated) suitable for a test operating mode by using the receiving housing 10 to hold the main body 1. However, the environment suitable for the test operating mode can be obtained by using a cover element instead of the receiving housing 10, which covers part of the main body 1. This is described in detail below.

[0117] Fig. Figure 7 is a side view of a biological noise measuring device 100B as a modification of the biological noise measuring device 100. The in Fig. 7 The biological noise measuring device 100B shown comprises a main body 1B and a cover element 12A, which is used in the test operating mode. Fig. Figure 7 represents a state in which the cover element 12A is attached to the main body 1B.

[0118] The hardware configuration of main body 1B is the same as that of main body 1, except that terminal block 7 is omitted.

[0119] The cover element 12A is a cylindrical element with a base for covering a section of the main body 1B, where the measuring unit 3 and the noise generator 8 are located. The main body 1B is inserted into a hollow section of the cover element 12A from the side of the head section 1a, thus securing the cover element 12A to the main body 1B.

[0120] In a state where the cover element 12A is attached to the main body 1B, a gap is formed between an inner wall of the cover element 12A and the pressure receiving section 3a. That is, in the state where the cover element 12A is attached to the main body 1B, the cover element 12A does not close the opening 31h in the first housing 31 of the main body 1B and covers the first housing 31, the second noise measuring instrument M2 and the noise generator 8.

[0121] Although the material of the cover element 12A is not specifically restricted, the material is preferably a material such as the receiving housing 10, which is capable of preventing the transmission of a noise in a frequency band which the first noise measuring instrument M1 and the second noise measuring instrument M2 can each measure (whereby the noise is reflected in the frequency band).

[0122] Regarding the operation of the biological noise measuring device 100B in test mode, control 4 performs the processing of step S1 in the flowchart of Fig. 5. The processing is carried out to determine whether the cover element 12A is attached to the main body 1B or not. If it is further determined that the cover element 12A is attached to the main body 1B, the control unit 4 carries out the processing of step S2 and subsequent steps.

[0123] In the biological noise measuring device 100B, for example, the following methods can be used as a method for control 4 to detect that the cover element 12A is attached to the main body 1B.

[0124] A first method is a method for providing a contact sensor in the handle section 1b of the main body 1B and detecting the fastening of the cover element 12A using the contact sensor.

[0125] A second method involves providing an operating button, for example in the handle section 1b, for signaling the completion of the fastening of the cover element 12A. In this method, after fastening the cover element 12A to the main body 1B, a user of the biological noise measuring device 100B presses the operating button. When the operating button is pressed, a fastening completion signal is transmitted to the controller 4. Upon receiving the fastening completion signal, the controller 4 detects that the cover element 12A is fastened to the main body 1B. (Results of the biological noise measuring device 100B)

[0126] As described above, results similar to those of biological noise measuring device 100 can be obtained using biological noise measuring device 100B. In biological noise measuring device 100B, the cover element 12A does not cover the entire main body 1B. Therefore, the manufacturing costs of the cover element 12A can be reduced, and consequently, the overall cost of biological noise measuring device 100B can be lowered. <Vierte Modifikation>

[0127] The biological noise measuring device 100 described so far causes the noise generator 8 to produce a test noise in a state in which the main body 1 is received in the receiving housing 10, so that it is less likely that the first noise measuring instrument M1 and the second noise measuring instrument M2 will measure a noise other than the test noise produced by the noise generator 8.

[0128] However, if the main body 1 is in a quiet environment, any noise other than the test noise generated by the test generator 8 is weak, and thus the measurement sensitivity test of the first noise measuring instrument M1 and the second noise measuring instrument M2 can be performed even if the main body 1 is not in the receiving housing 110. The fourth modification describes a biological noise measuring device 100C which tests the measurement sensitivity without using the receiving housing 10 as described.

[0129] Fig. Figure 8 is a schematic view depicting a schematic configuration of a biological noise measuring device 100C as the fourth modification of the biological noise measuring device 100. A hardware configuration of the biological noise measuring device 100C is the same as that of the main body 1 of the biological noise measuring device 100, except that the measuring unit 3 is changed to a measuring unit 3A and that the terminal block 7 is omitted. The biological noise measuring device 100C is an example of a main body of the claims.

[0130] Fig. 9 is along a line BB in Fig. Figure 8 shows a schematic cross-sectional view of the biological noise measuring device 100C. Fig. 9 are the same components as those in Fig. 2 with the same reference symbols.

[0131] The measuring unit 3A of the biological noise measuring device 100C has the same configuration as that of the measuring unit 3, except that a contact sensor 35 is added to a surface of the housing cover 32, which forms the pressure receiving section 3a.

[0132] The contact sensor 35 detects the contact of an object with respect to the pressure-sensing section 3a. The contact sensor 35 is configured, for example, with a piezoelectric sensor or with a set of a light-emitting element that emits light towards the body surface S and a light-receiving element that receives reflected light from the light emitted by the light-emitting element. When it is detected that an object is in contact with the pressure-sensing section 3a, the contact sensor 35 transmits a contact detection signal to the controller 4. (Operating example of the biological noise measuring device 100C)

[0133] Fig. 10 is a flowchart illustrating an operational example of the in Fig. Figure 8 shows the biological noise measuring device 100C in a test operating mode. Fig. 10 will have the same processing as in Fig. 5. Items shown are labelled with the same reference symbol and their descriptions are omitted.

[0134] When the test operating mode is set, the control unit 4 of the biological noise measuring device 100C determines, based on an output signal from the contact sensor 35, whether an object is in contact with the pressure receiving section 3a or not (step S10).

[0135] If an object is in contact with the pressure-sensing section 3a, there is a possibility that the opening 31h of the measuring unit 3A is closed by the object. Therefore, the controller 4 of the biological noise measuring device 100C determines that the opening 31h of the measuring unit 3A is closed when an object is in contact with the pressure-sensing section 3a, and determines that the opening 31h of the measuring unit 3A is not closed when no object is in contact with the pressure-sensing section 3a.

[0136] If an object is in contact with pressure-sensing section 3a (step S10: Yes), the control unit 4 of the biological noise measuring device 100C repeats the determination in step S10. If the duration for which an object is in contact with pressure-sensing section 3a is greater than or equal to a predetermined duration, the control unit 4 of the biological noise measuring device 100C can cause the display unit 6 to show a message to initiate a state in which nothing is in contact with the measuring unit 3a and to notify the user.

[0137] If it is determined that no object is in contact with the pressure-receiving section 3a (step 10: No), the control unit 4 of the biological noise measuring device 100C obtains information about a noise measured by the first noise measuring instrument M1 or the second noise measuring instrument M2 and determines whether an obtained intensity of the noise is less than or equal to a pre-defined second threshold or not (step S11).

[0138] The second threshold is a value used to determine whether an environment is suitable for measuring the test noise generated by the noise generator 8, and a value is set that is sufficiently lower than the intensity of the test noise generated by the noise generator 8.

[0139] If the determination in step S11 is "No", the control unit 4 of the biological noise measuring device 100C repeats the processing of step S11. If a period during which the determination in step S11 is "No" is greater than or equal to a predetermined period, the control unit 4 of the biological noise measuring device 100C can cause the display unit 6 to show a message requesting that the biological noise measuring device 100C be placed in a quiet environment and notifying the user.

[0140] If the determination in step S11 is yes, the control unit 4 of the biological noise measuring device 100C carries out the processing from step S2 to step S5.

[0141] Furthermore, if the determination in step S5 is yes, the control unit 4 of the biological noise measuring device 100C notifies the user that the detection of wheezing is possible by causing the display unit 6 to show this (step S6a).

[0142] If the determination in step S5 is No, the control unit 4 of the biological noise measuring device 100C notifies the user that the detection of wheezing is not possible by causing the display unit 6 to show this (step S7a).

[0143] A loudspeaker can be mounted in the biological sound measurement device 100C, and in step S7a, notification can be given by the loudspeaker announcing that wheezing detection is not possible. Alternatively, the biological sound measurement device 100C and an electronic device, such as a smartphone, can be configured to communicate with each other. A message indicating that wheezing detection is not possible can be transmitted from the controller 4 to the electronic device, and the message can be displayed or output audibly using a display or loudspeaker on the electronic device.

[0144] Alternatively, for example, an LED can be mounted instead of the display unit 6 of the biological noise measuring device 100C, and if it is determined that the relationship does not meet the condition, the controller 4 can notify the user that the measurement accuracy cannot be guaranteed by the LED emitting, for example, red light. (Results of the biological noise measuring device 100C)

[0145] As described above, according to the biological noise measuring device 100C, in test mode, a test noise is generated by the noise generator 8 in a state where the opening 31h in the first housing 31 is not closed. Therefore, the test noise can be measured by the first noise measuring instrument M1 and the second noise measuring instrument M2 under essentially the same conditions. Consequently, it is possible to determine precisely whether the relationship between the measurement sensitivity of the first noise measuring instrument M1 and the measurement sensitivity of the second noise measuring instrument M2 satisfies the condition or not.

[0146] If, according to the biological noise measuring device 100C, an ambient noise is weak (step S11: Yes), a test noise is generated by the noise generator 8. Therefore, a reduction in the calculated accuracy of the measurement sensitivity due to ambient noise of the biological noise measuring device 100C other than the test noise can be prevented, and the determination in step S5 in Fig. 10 can be performed with high accuracy.

[0147] According to the biological noise measuring device 100C, the recording housing 10 and the cover element 12A, as described above, are not necessary. Therefore, the manufacturing costs of the device can be reduced.

[0148] Assuming that the test operating mode is set in a state where the biological noise measuring device 100C is in a quiet environment, the processing of step S11 in Fig. 10 not significant.

[0149] Although an embodiment of the present invention and modifications thereof have been described above, the present invention is not limited thereto and can be modified as appropriate. For example, although the first noise measuring instrument M1 is configured, in the embodiment and modifications described above, to measure lung sounds as a biological sound in the environment, the first noise measuring instrument M1 can be configured to measure heart sounds or similar sounds as a biological sound. Furthermore, the housing cover 32 of the measuring unit 3 or the measuring unit 3A is not essential and can be omitted.

[0150] Although the embodiments are described above with reference to the drawings, it is needless to say that the present invention is not limited to such examples. It will be obvious to those skilled in the art that a wide variety of changes and modifications can be conceived within the scope of the claims. Reference symbol list 100, 100A, 100B, 100C biological noise measuring device 1, 1A, 1B Main body 1b Handle section 1a Head section 2 cases 3.3A measuring unit 3a Pressure absorption section 4 Control 5 batteries 6 Display unit 7 Terminal block 8 Noise generator Body surface Ha Hand 31 first case 31-hour opening SP1 Recording Room 32 Housing cover 34 second case 34-hour opening SP2 Recording Room 35 Contact sensor M1 first noise measuring instrument M2 second noise measuring instrument 10, 10A recording housing 11 Basic 12 lids 12A Cover element 13 Display unit 14 in-depth section 15 terminal block 16 Contact sensor

Claims

[1] Biological noise measuring device comprising: a principal body (1; 1A; 1B) comprising: a first noise measuring instrument (M1) configured to measure a biological noise, a housing (31) which accommodates the first noise measuring instrument (M1) and which has an opening (31h) which, in a state in which the housing (31) is pressed against the body surface (S), is closed by a body surface (S) of a living body, a second noise measuring instrument (M2) provided outside the enclosure (31) and configured to measure ambient noise of the enclosure (31), and a control (4) which causes a noise generator (8) to produce a noise in a state in which the opening (31h) in the housing (31) is not closed, which determines, based on an intensity of the noise measured by the first noise measuring instrument (M1) and an intensity of the noise measured by the second noise measuring instrument (M2), whether a relationship between a measurement sensitivity of the first noise measuring instrument (M1) and a measurement sensitivity of the second noise measuring instrument (M2) satisfies a predetermined condition or not, and which, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument (M1) and / or the second noise measuring instrument (M2). [2] Biological noise measuring device according to claim 1, further comprising: a cover element which covers the housing (31) and the second noise measuring instrument (M2) in the state in which the opening (31h) in the housing (31) is not closed and which is removable with respect to the main body (1; 1A; 1B), wherein the noise generator (8) is arranged in a position which, in a state in which the cover element is attached to the main body (1; 1A; 1B), is covered by the cover element, and wherein the control (4) determines, when the fastening of the cover element is detected by the control (4), that it is in the state in which the opening (31h) in the housing (31) is not closed. [3] Biological noise measuring device according to claim 2, wherein the cover element is made of a material which prevents the transmission of a noise which the first noise measuring instrument (M1) and the second noise measuring instrument (M2) can measure. [4] Biological measuring device according to claim 3, wherein the control (4) detects that the cover element is attached when the intensity of an external noise measured by the first noise measuring instrument (M1) or the second noise measuring instrument (M2) is less than or equal to a first threshold value. [5] Biological noise measuring device according to one of claims 2 to 4, wherein the noise generator (8) is provided in the cover element. [6] Biological noise measuring device according to one of claims 2 to 4 wherein the main body (1; 1A; 1B) further comprises the noise generator (8). [7] Biological noise measuring device according to claim 1, wherein the control (4) causes the noise generator (8) to produce the noise when the intensity of a peripheral noise measured by the first noise measuring instrument (M1) or the second noise measuring instrument (M2) is less than or equal to a predetermined second threshold, and the condition exists in which the opening (31h) of the housing (31) is not closed. [8] Biological noise measuring device according to claim 1 or 7, wherein the main body (1; 1A; 1B) further comprises the noise generator (8). [9] Method for operating a biological sound measuring device comprising: a first sound measuring instrument (M1) configured to measure a biological sound, a housing (31) which receives the first sound measuring instrument (M1) and which has an opening (31h) which, in a state in which the housing (31) is pressed against a body surface (S), is closed by the body surface (S) of a living body, and a second sound measuring instrument (M2) which is provided outside the housing (31) and which is configured to measure an ambient sound of the housing (31), wherein the method comprises: a step which causes a noise generator (8) to produce a noise in a state in which the opening (31h) in the housing (31) is not closed, which determines, based on an intensity of the noise measured by the first noise measuring instrument (M1) and an intensity of the noise measured by the second noise measuring instrument (M2), whether a relationship between a measurement sensitivity of the first noise measuring instrument (M1) and a measurement sensitivity of the second noise measuring instrument (M2) satisfies a predetermined condition or not, and, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument (M1) and / or the second noise measuring instrument (M2). [10] Program for operating a biological sound-measuring device comprising: a first sound-measuring instrument (M1) configured to measure a biological sound, a housing (31) which receives the first sound-measuring instrument (M1) and which has an opening (31h) which, in a state in which the housing (31) is pressed against a body surface (S), is closed by the body surface (S) of a living body, and a second sound-measuring instrument (M2) which is provided outside the housing (31) and which is configured to measure an ambient sound of the housing (31), wherein the program causes a computer to perform the following step: Causing a noise generator (8) to produce a noise in a state in which the opening (31h) of the housing (31) is not closed, determines, based on an intensity of the noise measured by the first noise measuring instrument (M1) and an intensity of the noise measured by the second noise measuring instrument (M2), whether a relationship between a measurement sensitivity of the first noise measuring instrument (M1) and a measurement sensitivity of the second noise measuring instrument (M2) satisfies a predetermined condition or not, and, if it is determined that the relationship does not satisfy the condition, indicates that it is unable to ensure the measurement accuracy of the biological noise, or adjusts the measurement sensitivity of the first noise measuring instrument (M1) and / or the second noise measuring instrument (M2).

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