JP2019150117A - Biological sound detection device, biological sound detection method, biological sound detection program and recording medium - Google Patents

Abstract

To determine whether an organism is such an organism from which a particular biological sound can be detected, in a biological sound detection device for detecting a particular biological sound from an organism.SOLUTION: A biological sound detection device (10) for detecting a particular biological sound from an organism includes: a biological sound sensor (41) for detecting a biological sound of an organism; and an adjustment sound propagation device (20) for echoing an adjustment sound that is detected by the biological sound detection device (10) as a particular biological sound, inside an organism.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a biological sound detection device, a biological sound detection method, a biological sound detection program, and a recording medium that detect a specific biological sound.

  As techniques for detecting specific biological sounds, techniques described in Patent Documents 1 to 4 are known.

  Patent Document 1 describes a technique for automatically detecting a time interval in which peristaltic sound is recorded based on a Fourier transform spectrum (frequency spectrum) obtained by Fourier transforming peristaltic sound emitted from the digestive system. . In this technique, a time interval having a significant peak in the range of 100 to 1000 Hz of the frequency spectrum is considered as an interval where peristaltic sounds are recorded.

  Patent Document 2 describes a technique that employs a Wigner distribution as a frequency distribution of a valve sound waveform at the time of closing a valve detected by a heart sound meter, and further obtains a primary moment for each time with respect to the Wigner distribution. .

  The biological sound detection processing device described in Patent Document 3 performs FFT processing on biological sound detection data (respiratory sound detection data) to calculate an amplitude spectrum, a phase spectrum, and a power spectrum. Furthermore, the biological sound detection processing device calculates a local average value and a local variance value from the power spectrum. Depending on the magnitude of the local dispersion value, the amplitude spectrum is classified into one corresponding to normal breathing sound or one based on continuous rales.

  The peristaltic sound detection device described in Patent Document 4 is complicated by individually matching the frequency spectrum of a biological sound and each of the standard frequency spectra of a plurality of peristaltic sounds, and calculating a plurality of matching coefficients. Without performing arithmetic processing, it is accurately determined whether or not the body sound emitted from the intestine is a peristaltic sound.

JP 2000-262523 A (published September 26, 2000) JP-A-6-90913 (published April 5, 1994) JP 2004-357758 A (released on December 24, 2004) JP2013-150723A (released on August 8, 2013)

  However, in the conventional technology as described above, when a specific biological sound cannot be detected in a certain living body, the specific biological sound is not sounded in the living body, or the specific biological sound is sounded. There is a problem that it is not possible to determine whether any factor in this prevents the detection of a specific body sound.

  One aspect of the present invention has been made in view of the above problems, and in a biological sound detection device that detects a specific biological sound from a biological body, whether or not the biological body is capable of detecting the specific biological sound. The main purpose is to provide a technique for enabling such determination.

  In order to solve the above problems, a biological sound detection device according to an aspect of the present invention is a biological sound detection device that detects a specific biological sound from a biological body, and detects the biological sound of the biological body. And an adjustment sound propagation unit that causes the adjustment sound detected as the specific biological sound by the biological sound detection device to resonate in the living body.

  A biological sound detection method according to an aspect of the present invention is a biological sound detection method for detecting a specific biological sound from a living body by a biological sound detection device, and is detected as the specific biological sound by the biological sound detection device. An adjustment sound propagation step for causing the adjustment sound to resonate in the living body, a first detection step for detecting the living body sound of the living body in a state where the adjustment sound resonates in the living body, and the adjustment sound to resonate in the living body. And a second detection step of detecting a biological sound of the living body in a state where it is not.

  According to one aspect of the present invention, in a body sound detection device that detects a specific body sound from a body, it is possible to determine whether the body is a body capable of detecting the specific body sound.

It is a block diagram which shows schematic structure of the biological sound detection apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the flow of the body sound detection by the body sound detection apparatus which concerns on one Embodiment of this invention. It is a flowchart explaining the detection and detection process by the biological sound detection apparatus which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail.

(Biological sound detection apparatus 10)
FIG. 1 is a block diagram showing a schematic configuration of a biological sound detection device 10 according to an embodiment of the present invention. As shown in FIG. 1, the biological sound detection device 10 includes an adjustment sound propagation device (adjustment sound propagation unit) 20, a main control unit (detection processing unit) 30, a biological sound sensor (biological sound detection unit) 41, and an environmental sound sensor. (Environmental sound detection unit) 51 is provided.

  The adjusted sound propagation device 20 includes a reproduction unit 11 and a propagation unit 12. The main control unit 30 includes a frequency spectrum calculation unit 42, a matching coefficient calculation unit 43, an individual sensor determination unit 44, a biological sound sensor selection unit 45, a frequency spectrum calculation unit 52, a matching coefficient calculation unit 53, an individual sensor determination unit 54, an environment A sound sensor selection unit 55, a frequency spectrum number recording unit 57, a threshold recording unit 58, a threshold change determination unit 59, a biological sound determination unit 60, and a log recording unit 61 are provided.

  The biological sound sensor 41, the frequency spectrum calculation unit 42, the matching coefficient calculation unit 43, and the individual sensor determination unit 44 constitute a biological sound sensor unit 40. In FIG. 1, only one biological sound sensor unit 40 is shown, but the biological sound detection device 10 includes one or more biological sound sensor units 40. In addition, it is preferable that the biological sound sensor 41 of each biological sound sensor unit 40 is provided in a different position. By providing a plurality of biological sound sensor units 40, it is possible to suppress detection failure of biological sound due to the position of the biological sound sensor 41.

  The environmental sound sensor 51, the frequency spectrum calculation unit 52, the matching coefficient calculation unit 53, and the individual sensor determination unit 54 constitute an environmental sound sensor unit 50. Although only one environmental sound sensor unit 50 is shown in FIG. 1, the biological sound detection device 10 includes one or more environmental sound sensor units 50. In addition, it is preferable that the environmental sound sensor 51 of each environmental sound sensor unit 50 is provided in a different position. By including a plurality of environmental sound sensor units 50, it is possible to suppress detection omission of environmental sound due to the position of the environmental sound sensor 51.

  The adjustment sound propagation device 20 may be referred to as an adjustment sound generation device. Moreover, you may call the part remove | excluding the adjustment sound propagation apparatus 20 from the biological sound detection apparatus 10 as a biological sound counting device. The biological sound detection device 10 may be referred to as a biological sound counting device with an adjustment sound generator.

  The biological sound detection device 10 is a device that detects a specific biological sound. The biological sound means a sound in the living body. Hereinafter, the specific biological sound detected by the biological sound detection device 10 is also referred to as a target biological sound. In one aspect, the target biological sound is a peristaltic sound generated by the intestine. By detecting a peristaltic sound emitted from the intestine by the body sound detection device 10, the activity of the intestine can be measured.

(Body sound sensor 41)
A biological sound sensor 41, which is an acoustic sensor that detects a biological sound of a living body serving as a subject, detects an acoustic signal (biological sound) and converts it into an electrical signal. As the biological sound sensor 41, for example, a close-contact acoustic microphone can be used, but is not limited thereto. The biological sound sensor 41 can be fixed to, for example, the body surface of a living body serving as a subject. When the target biological sound is a peristaltic sound, the biological sound sensor 41 may be fixed to the abdominal body surface of the living body serving as the subject. The biological sound sensor 41 outputs the detected biological sound as an electrical signal to the frequency spectrum calculation unit 42.

  The biological sound sensor 41 may include an amplifier (not shown) for amplifying the electrical signal. The amplifier is not limited to the configuration provided in the biological sound sensor 41, and may be provided in the frequency spectrum calculation unit 42.

(Frequency spectrum calculation unit 42)
The frequency spectrum calculation unit 42 that calculates the frequency spectrum preferably includes an analog / digital conversion unit (A / D conversion unit). The A / D converter receives an electrical signal from the body sound sensor 41 and converts it into body sound data that is digital data. The biological sound sensor 41 may be provided with the A / D conversion unit.

  Next, the frequency spectrum calculation unit 42 performs a fast Fourier transformation (FFT) process on the body sound data at predetermined time intervals, whereby the frequency spectrum of the body sound (hereinafter referred to as the body sound spectrum). To be described) (frequency spectrum calculation process). In other words, the frequency spectrum calculation unit 42 divides the temporally continuous body sound data into body sound data for each predetermined time. After that, each divided body sound data is sequentially subjected to FFT processing. The predetermined time is also referred to as an FFT processing interval below. The FFT processing interval can be set within a range of, for example, 0.3 seconds to 1.0 seconds, but is not limited thereto, and can be appropriately set according to the capability of the frequency spectrum calculation unit 42 and the like. The frequency spectrum calculation unit 42 may calculate the frequency spectrum of the biological sound using another algorithm such as wavelet transform instead of the FFT.

  The frequency spectrum calculation unit 42 sequentially outputs the body sound spectrum calculated every predetermined time to the matching coefficient calculation unit 43. In the following, in order to make the explanation of each part easy to understand, description will be made by paying attention to one biological sound spectrum calculated at a specific timing.

(Matching coefficient calculation unit 43)
The matching coefficient calculation unit 43 individually matches the body sound spectrum and a plurality of standard frequency spectra (sees correlation, compares, also extracts matching points), thereby obtaining a plurality of matching coefficients (correlation). Number) (matching coefficient calculation process).

  The matching coefficient calculation unit 43 first receives the body sound spectrum from the frequency spectrum calculation unit 42 and reads a plurality of standard frequency spectra for matching with the body sound spectrum from the standard frequency spectrum storage unit 56.

  In one aspect, the plurality of standard frequency spectra may be frequency spectra of a target biological sound that is generated based on a specific body state and generation mode, each calculated based on a real sound. The plurality of standard frequency spectra can be stored in advance in the standard frequency spectrum storage unit 56, and may be selected and used according to the purpose.

  In one aspect, the standard frequency spectrum is obtained by extracting a plurality of biological sounds (hereinafter also referred to as standard biological sounds) that a doctor or the like has recognized in advance as the target biological sounds, and subjecting each standard biological sound to FFT processing. May be.

  For example, when the target biological sound is intestinal peristaltic sound, it is preferable that the standard frequency spectrum used for matching is obtained by performing FFT processing on peristaltic sounds resulting from a plurality of different generation modes. This is because there are a plurality of generation modes of peristaltic sounds that occur when the intestine peristally moves, and the intestines emit different peristaltic sounds according to each generation mode.

  In addition, since the target biological sound may vary greatly depending on the individual, a plurality of standard biological sounds extracted from a plurality of people may be subjected to FFT processing to obtain a plurality of standard frequency spectra. Alternatively, a standard frequency spectrum may be obtained by subjecting a plurality of standard biological sounds to FFT processing and extracting a common spectrum. Furthermore, the standard frequency spectrum may be calculated by subjecting the target body sound generated by a healthy subject to FFT processing and statistical processing.

  By preparing a plurality of standard frequency spectra as described above, it is possible to reduce detection omission of the target body sound and accurately determine whether the body sound is the target body sound.

  The matching coefficient is a coefficient representing the degree of similarity between the body sound spectrum and the standard frequency spectrum. In other words, the coefficient represents the size of the element of the standard frequency spectrum included in the body sound spectrum. Therefore, the larger the matching coefficient is, the more similar the body sound spectrum and the standard frequency spectrum are, that is, the body sound spectrum includes many elements of the standard frequency spectrum.

  A well-known method can be used for matching with the body sound spectrum and the standard frequency spectrum. In one aspect, the matching coefficient calculation unit 43 may be configured to calculate a matching coefficient that is a real number included in the range of 0 to 1. When the matching coefficient calculation unit 43 is configured in this way, a matching coefficient of 1 means that the body sound spectrum and the standard frequency spectrum match.

  The matching coefficient calculation unit 43 outputs a plurality of matching coefficients calculated by matching to the individual sensor determination unit 44.

(Individual sensor determination unit 44)
The individual sensor determination unit 44 receives a plurality of matching coefficients from the matching coefficient calculation unit 43, and determines a determination matching coefficient used for the determination process (determination matching coefficient determination process). In one aspect, the individual sensor determination unit 44 determines the largest matching coefficient among the plurality of matching coefficients as the determination matching coefficient.

  The individual sensor determination unit 44 may record information (for example, a number) indicating a standard frequency spectrum corresponding to the selected matching coefficient in the frequency spectrum number recording unit 57. Thereby, the user can obtain more detailed information about the detected target body sound.

  Moreover, in another aspect, the individual sensor determination unit 44 may determine a value obtained by adding a plurality of matching coefficients as a matching coefficient for determination. For example, the peristaltic movement of the intestine is not necessarily generated only by a single generation mode, and a peristaltic movement that includes elements of a plurality of generation modes may occur. Therefore, by determining a value obtained by adding a plurality of matching coefficients as a matching coefficient for determination, even if the body sound includes elements of a plurality of generation modes little by little, it can be detected as the target body sound.

  The individual sensor determination unit 44 outputs the determined determination matching coefficient to the biological sound sensor selection unit 45.

(Body sound sensor selection unit 45)
The biological sound sensor selection unit 45 receives the matching coefficient for determination from the individual sensor determination unit 44 of each biological sound sensor unit 40. Then, the biological sound sensor selection unit 45 selects whether the matching coefficient for determination obtained from the biological sound detected by which biological sound sensor 41 is used in the determination process (selection process). In other words, the biological sound sensor selection unit 45 selects whether to output the determination matching coefficient received from the individual sensor determination unit 44 of which biological sound sensor unit 40 to the biological sound determination unit 60.

  When there is one biological sound sensor unit 40, the biological sound sensor selection unit 45 outputs the determination matching coefficient received from the individual sensor determination unit 44 of the biological sound sensor unit 40 to the biological sound determination unit 60. When there is one biological sound sensor unit 40, the biological sound sensor selection unit 45 may be omitted, and the individual sensor determination unit 44 may output the determination matching coefficient to the biological sound determination unit 60.

  When there are a plurality of biological sound sensor units 40, the biological sound sensor selection unit 45 performs matching for determination based on a predetermined determination criterion among the determination matching coefficients received from the individual sensor determination unit 44 of each biological sound sensor unit 40. The coefficient is output to the biological sound determination unit 60. For example, the maximum determination matching coefficient may be selected as the predetermined determination criterion, but is not limited thereto.

(Environmental sound sensor 51)
The environmental sound sensor 51, which is an acoustic sensor for detecting the environmental sound around the biological sound detection device 10, especially the environmental sound around the biological sound sensor 41, detects the acoustic signal (environmental sound) and converts it into an electrical signal. . As the environmental sound sensor 51, for example, an acoustic microphone can be used, but is not limited thereto. The environmental sound sensor 51 may be configured to hang in the air. The environmental sound sensor 51 outputs the detected environmental sound as an electrical signal to the frequency spectrum calculation unit 52.

  The environmental sound sensor 51 may include an amplifier (not shown) for amplifying the electric signal. The amplifier is not limited to the configuration provided in the environmental sound sensor 51, and may be provided in the frequency spectrum calculation unit 52.

(Frequency spectrum calculation unit 52)
The frequency spectrum calculation unit 52 has a configuration similar to that of the frequency spectrum calculation unit 42, and performs an FFT process on the environmental sound data obtained by converting the environmental sound into digital data at predetermined time intervals, so that A frequency spectrum (hereinafter also referred to as an environmental sound spectrum) is calculated (second frequency spectrum calculation process). The frequency spectrum calculation unit 52 may calculate the frequency spectrum of the environmental sound using another algorithm such as wavelet transform instead of FFT.

  The frequency spectrum calculation unit 52 sequentially outputs the environmental sound spectrum calculated every predetermined time to the matching coefficient calculation unit 53. In the following, in order to make the explanation of each part easy to understand, description will be made by paying attention to one environmental sound spectrum calculated at a specific timing.

(Matching coefficient calculator 53)
In order to determine the approximation between the environmental sound spectrum and the standard biological sound, the matching coefficient calculation unit 53 determines the environmental sound spectrum and the plurality of standard frequency spectra, respectively, in the same manner as the matching of the biological sound spectrum in the matching coefficient calculation unit 43. A plurality of second matching coefficients (correlation coefficients) are calculated by matching individually (seeing correlation, comparing, and extracting matching points) (second matching coefficient calculation processing).

  In one aspect, the matching coefficient calculation unit 53 may be configured to calculate a second matching coefficient that is a real number included in the range of 0 to 1. When the matching coefficient calculation unit 53 is configured in this way, a second matching coefficient of 1 means that the environmental sound spectrum and the standard frequency spectrum match.

  The matching coefficient calculation unit 53 outputs a plurality of second matching coefficients calculated by matching to the individual sensor determination unit 54.

(Individual sensor determination unit 54)
The individual sensor determination unit 54 receives a plurality of second matching coefficients from the matching coefficient calculation unit 53, and determines a second matching coefficient for determination used for the determination process (second matching coefficient determination process for determination). In one aspect, the individual sensor determination unit 54 determines the largest matching coefficient among the plurality of second matching coefficients as the second matching coefficient for determination. In another aspect, the individual sensor determination unit 54 may determine a value obtained by adding a plurality of second matching coefficients as the determination second matching coefficient.

  The individual sensor determination unit 54 outputs the determined second matching coefficient for determination to the environmental sound sensor selection unit 55.

(Environmental sound sensor selector 55)
The environmental sound sensor selection unit 55 receives the second matching coefficient for determination from the individual sensor determination unit 54 of each biological sound sensor unit 50. And the environmental sound sensor selection part 55 selects whether the 2nd matching coefficient for determination obtained from the environmental sound which which environmental sound sensor 51 detected is used by determination processing (2nd selection processing). In other words, the environmental sound sensor selection unit 55 selects which of the environmental sound sensor units 50 the determination second matching coefficient received from the individual sensor determination unit 54 is to be output to the biological sound determination unit 60.

  When there is one environmental sound sensor unit 50, the environmental sound sensor selection unit 55 outputs the second matching coefficient for determination received from the individual sensor determination unit 54 of the environmental sound sensor unit 50 to the biological sound determination unit 60. When there is one environmental sound sensor unit 50, the environmental sound sensor selection unit 55 may be omitted, and the individual sensor determination unit 54 may output the second matching coefficient for determination to the biological sound determination unit 60. Good.

  When there are a plurality of environmental sound sensor units 50, the environmental sound sensor selection unit 55 determines a predetermined determination criterion from among the second matching coefficients for determination received from the individual sensor determination unit 54 of each environmental sound sensor unit 50. The matching coefficient is output to the biological sound determination unit 60. As a predetermined criterion, for example, the maximum second matching coefficient for determination may be selected, but is not limited thereto.

(Body sound determination unit 60)
The biological sound determination unit 60 uses the biological sound sensor 41 based on the determination matching coefficient received from the biological sound sensor selection unit 45 and the determination second matching coefficient received from the environmental sound sensor selection unit 55 at the same timing. It is determined whether or not the detected biological sound is the target biological sound (determination process).

  That is, among environmental sounds, there is a sound whose standard frequency spectrum and matching coefficient are high. For example, such a sound is also included in the sound when an object is dropped or in a spoken voice. Therefore, in one aspect, the body sound determination unit 60, when the body sound-derived determination body sound matching coefficient exceeds the threshold, at the same timing, when the environment sound-derived determination second matching coefficient exceeds the threshold, In timing, it can be determined that the detected biological sound is not the target biological sound.

  In this way, the specific biological sound can be detected with high accuracy by detecting the specific biological sound in consideration of whether or not the sound similar to the specific biological sound is included from the environmental sound.

  The biological sound determination unit 60 stores the determination result in the log recording unit 61. In one aspect, the biological sound determination unit 60 may count the number of times determined to be the target biological sound per unit time (the number of times the target biological sound has been detected) and record it in the log recording unit 61.

  The biological sound detection device 10 can also check the change in the biological activity state by calculating the number of occurrences of the detected target biological sound per unit time. For example, when the target body sound is an intestinal peristaltic sound, it is possible to observe state changes such as intestinal activity caused by the ingestion and intestinal activity that occurs regardless of the ingestion.

  Further, in one aspect, the body sound determination unit 60 performs a determination process using the threshold value recorded in the threshold value recording unit 58. For example, the biological sound determination unit 60 determines that the biological sound detected by the biological sound sensor 41 is the target biological body when the determination matching coefficient is greater than or equal to the first threshold and the second matching coefficient is less than the second threshold. Judged as sound. The first threshold value and the second threshold value may be the same value. As a result, it is detected when the environmental sound does not include a sound that induces false detection (a sound similar to the target biological sound) and the biological sound includes a sound that can be determined as the target biological sound. The biological sound can be determined as the target biological sound, and the target biological sound can be detected with high accuracy.

  In another aspect, the body sound determination unit 60 stores the determination matching coefficient received from the body sound sensor selection unit 45 and the determination second matching coefficient received from the environment sound sensor selection unit 55 (not shown). It may be determined whether or not the detected biological sound is the target biological sound based on the plurality of matching coefficients for determination and the second matching coefficient for determination accumulated in the unit. In other words, the determination matching coefficient and the determination second matching coefficient may be a plurality of coefficient groups for a certain period. Thereby, the influence of the unintended abnormal value can be eliminated, and the target biological sound can be detected with high accuracy.

  In this case, the biological sound determination unit 60 compares the determination matching coefficient and the determination second matching coefficient at each timing with the threshold as described above, and the determination matching coefficient is equal to or greater than the first threshold. Thus, it may be determined whether or not the detected biological sound is the target biological sound in accordance with the ratio of the set in which the second matching coefficient is determined to be less than the second threshold. Further, by calculating a statistical representative value (average value, etc.) for the plurality of determination matching coefficients and the plurality of determination second matching coefficients, and comparing the representative value with a threshold value, the detected biological sound becomes the target biological body. You may determine whether it is a sound.

  Moreover, in one aspect | mode, each part performs the process mentioned above in real time. Moreover, in another aspect, each part may buffer the processed data in the memory | storage part which is not shown in figure, and may process in non real time.

(Adjustment sound propagation device 20)
The adjustment sound propagation device 20 is a device that causes the adjustment sound detected as the target biological sound by the biological sound detection device 10 to resonate in the living body. The reproduction unit 11 is a sound reproduction device such as a music player, and inputs the reproduced adjustment sound to the propagation unit 12. The propagation unit 12 is a sound propagation device (sound is generated in the living body) for making the adjustment sound resonate in the living body, and is configured by, for example, a bone conduction speaker. The propagation unit 12 is attached so as to come into contact with the bone of a living body serving as a subject, and converts the adjustment sound into vibration and transmits the vibration to the bone, thereby allowing the adjustment sound to resonate inside the living body. For example, when the target body sound is an intestinal peristaltic sound, the propagation unit 12 can be mounted on the pelvic spine or sacrum of the pelvis and the adjustment sound can be caused to resonate in the abdominal cavity by vibration. . If there is no abnormality in the living body serving as the subject, the adjustment sound is detected by the biological sound sensor 41 attached to the living body via the body.

  The adjustment sound is preferably a sound with a known volume with a high matching coefficient with the standard frequency spectrum. Further, the volume of the adjustment sound may be constant or may change between large, medium and small. The adjustment sound pattern, interval, and length are preferably known.

  The body sound detection device 10 includes the adjustment sound propagation device 20 so that the body sound sensor 41 detects the body sound while the adjustment sound propagation device 20 makes the adjustment sound resonate in the living body, and detects the body sound. By confirming whether or not the living body can be detected, it is possible to determine whether or not the living body is a living body capable of detecting the target body sound.

(Flow of biological sound detection)
FIG. 2 is a flowchart for explaining the flow of biological sound detection by the biological sound detection device 10. First, in step S1, the main control unit 30 sets the counter N to a predetermined value Count. Subsequently, in step S2, the adjustment sound propagation device 20 causes the adjustment sound to resonate inside the living body (adjustment sound propagation step).

  Subsequently, in step S3, detection and detection processing is performed. In the detection and detection process in step S3, first, the body sound sensor 41 detects the body sound of the living body in a state where the adjustment sound is echoed in the living body (first detection step), and the main control unit 30 is detected. The target body sound is detected for the body sound (detection process step). Details of detection and detection processing will be described later.

  Subsequently, in step S4, the main control unit 30 decrements the counter N by 1. If the counter N is still larger than 0 (YES in step S5), the process returns to step S2, and if the counter N becomes 0. (NO in step S5), the process proceeds to step S6. Thereby, a detection and a detection process can be repeated N times.

  In step S <b> 6, the body sound determination unit 60 records the detection result (count number) of the target body sound in the log recording unit 61. In step S7, the adjustment sound propagation device 20 stops the adjustment sound. In step S8, the main control unit 30 sets the counter N to the predetermined value Count again.

  Subsequently, in step S9, detection and detection processing is performed. In the detection and detection processing in step S9, first, the biological sound sensor 41 detects the biological sound of the living body in a state where the adjustment sound does not sound in the living body (second detection step), and the main control unit 30 is detected. The target body sound is detected for the body sound (detection process step).

  Subsequently, in step S10, the main control unit 30 decrements the counter N by 1. If the counter N is still larger than 0 (YES in step S11), the process returns to step S9, and if the counter N becomes 0. (NO in step S11), the process proceeds to step S12. Thereby, a detection and a detection process can be repeated N times.

  In step S <b> 12, the body sound determination unit 60 records the detection result (count number) of the target body sound in the log recording unit 61. By comparing the count number recorded in the log recording unit 61 in step S6 with the count number recorded in the log recording unit 61 in step S12, the user cannot detect the body sound of the subject. It is possible to confirm whether there is a cause in the sound propagation path or in the absence of biological sound. It can be confirmed whether or not the target body sound can be appropriately detected from the living body.

(Detection and detection processing)
FIG. 3 is a flowchart for explaining detection and detection processing by the biological sound detection device 10. In FIG. 3, the case where the body sound detection device 10 includes a plurality of body sound sensor units 40 and a plurality of environment sound sensor units 50 will be described. Here, each biological sound sensor unit 40 is referred to as a biological sound sensor unit 40a and a biological sound sensor unit 40b, respectively. Moreover, each environmental sound sensor unit 50 is described as an environmental sound sensor unit 50a and an environmental sound sensor unit 50b, respectively.

  In the detection and detection process, all the processes in each biological sound sensor unit 40 and each environmental sound sensor unit 50 are performed in parallel.

  That is, in the body sound sensor unit 40a, the body sound sensor 41 detects the body sound (step S20a), the frequency spectrum calculation unit 42 calculates the frequency spectrum of the body sound (step S21a), and a plurality of matching coefficient calculation units 43 are provided. Are calculated (step S22a), and the individual sensor determination unit 44 determines a matching coefficient for determination (step S23a). In parallel, in the body sound sensor unit 40b, the body sound sensor 41 detects the body sound (step S20b), the frequency spectrum calculation unit 42 calculates the frequency spectrum of the body sound (step S21b), and the matching coefficient calculation unit 43. Calculates a plurality of matching coefficients (step S22b), and the individual sensor determination unit 44 determines a matching coefficient for determination (step S23b). The biological sound sensor selection unit 45 selects one of the determination matching coefficients from the determination matching coefficients determined by the biological sound sensor unit 40a and the biological sound sensor unit 40b (step S24).

  In the environmental sound sensor unit 50a, the environmental sound sensor 51 detects the environmental sound (step S30a), the frequency spectrum calculation unit 52 calculates the frequency spectrum of the environmental sound (step S31a), and a plurality of matching coefficient calculation units 53 are provided. The second matching coefficient is calculated (step S32a), and the individual sensor determination unit 54 determines the second matching coefficient for determination (step S33a). In parallel, in the environmental sound sensor unit 50b, the environmental sound sensor 51 detects the environmental sound (step S30b), the frequency spectrum calculation unit 52 calculates the frequency spectrum of the environmental sound (step S31b), and the matching coefficient calculation unit 53. Calculates a plurality of second matching coefficients (step S32b), and the individual sensor determination unit 54 determines a second matching coefficient for determination (step S33b). Then, the environmental sound sensor selection unit 55 selects one determination second matching coefficient from the determination second matching coefficients determined by the environmental sound sensor unit 50a and the environmental sound sensor unit 50b, respectively (step S34).

  Then, the body sound determination unit 60 performs a determination process (step S40).

  As described above, the biological sound detection device 10 includes: (i) the biological sound detected by the biological sound sensor 41 in a state where the adjustment sound propagation device 20 makes the adjustment sound echo in the living body; and (ii) the adjustment sound propagation device. Detection processing is performed for each of the body sounds detected by the body sound sensor 41 in a state where the adjustment sound does not resonate in the body.

  At this time, if the target body sound cannot be detected from either the body sound of (i) or the body sound of (ii), the sound propagation is inhibited in the body, and the body sound detection device 10 Thus, it is possible to recognize that the subject is not a subject in order to detect the target body sound using the standard frequency spectrum.

  Further, when the target body sound can be detected only from the body sound of (i), it is possible to recognize that the body sound cannot be detected although the propagation of sound does not occur in the body.

  In addition, when the target body sound can be detected from both the body sound of (i) and the body sound of (ii), the body sound is detected without inhibiting the propagation of the sound in the body. You can recognize what you have done.

  Thereby, when the user uses the body sound detection device 10 to determine the body sound of the subject (patient), if the body sound cannot be detected, (i) whether the body sound that can be detected at all is not sounded ( ii) It is possible to determine whether the body sound is sounding but cannot be detected because it is changed to a sound having a frequency spectrum that does not match in the propagation path in the body.

(Threshold change)
In one embodiment, the threshold values (first threshold value, second threshold value) recorded in the threshold value recording unit 58 may be experimentally obtained and recorded in advance.

  In one aspect, the threshold value may be set or changed by the threshold value change determination unit 59.

(Threshold setting by initial environmental sound)
In one aspect, the frequency spectrum calculation unit 52, the matching coefficient calculation unit 53, and the individual sensor determination unit 54 respectively perform the environmental sound detected by the environmental sound sensor 51 before the main control unit 30 performs the above-described body sound detection. The second frequency spectrum calculation process, the second matching coefficient calculation process, and the determination second matching coefficient determination process are performed, and the threshold value change determination unit 59 determines the first threshold value and the determination value based on the obtained determination second matching coefficient. The initial value of the second threshold may be determined and recorded in the threshold recording unit 58.

  In one aspect, the threshold value change determination unit 59 sets a value exceeding the determination second matching coefficient obtained in a certain time as an initial value of each threshold value. At this time, the threshold value change determination unit 59 may obtain a standard deviation value and ignore a sound that is not a steady environmental sound, such as a voice or a dropped object. The range of dispersion is determined in advance, for example, 1%, and the dispersion value other than stationary sound is determined as irregular environmental sound.

(Real-time threshold change according to environmental changes)
In one aspect, the threshold value change determination unit 59 determines the second matching coefficient for determination determined by the individual sensor determination unit 54 periodically or aperiodically while the main control unit 30 performs the above-described body sound detection. Based on the above, at least one of the first threshold and the second threshold may be changed.

(First aspect)
For example, the second matching coefficient for determination derived from the environmental sound is almost equal to the second threshold value due to a change in the environmental sound such as moving a machine in the vicinity, moving a room to add a steady sound, or adding an air conditioning sound. As a result, the detection of the target biological sound may be almost invalidated. In that case, since the steady sound of the environmental sound has changed, the threshold value change determination unit 59 changes each threshold value based on the determination matching coefficient and the determination second matching coefficient. For example, the maximum value in a certain range is calculated from the standard deviation of the second matching coefficient for determination derived from the environmental sound obtained during a certain period (for example, 1 minute), and the value exceeding this value is set as the environmental threshold. Further, the minimum value in a certain range is calculated from the standard deviation of the matching coefficient for determination derived from the body sound obtained in a certain period (for example, 1 minute), and the value is set as the body sound minimum value.

  Then, the threshold value change determination unit 59 sets each threshold value to a value that is equal to or greater than the environmental threshold value and equal to or greater than the biological sound minimum value. The threshold can be changed periodically (eg, every minute, every five minutes, etc.) or aperiodically.

(Second aspect)
In addition, for example, if there is a change in the environmental sound, such as stopping the machine in the vicinity, moving around the room to be quiet, turning off the air conditioning, etc., if each threshold is left as it is, the target biological sound is always detected May end up. In that case, since the steady sound of the environmental sound has changed, the threshold value change determination unit 59 changes each threshold value based on the determination matching coefficient and the determination second matching coefficient. For example, the maximum value in a certain range is calculated from the standard deviation of the second matching coefficient for determination derived from the environmental sound obtained during a certain period (for example, 1 minute), and the value exceeding this value is set as the environmental threshold. Further, the minimum value in a certain range is calculated from the standard deviation of the matching coefficient for determination derived from the body sound obtained in a certain period (for example, 1 minute), and the value is set as the body sound minimum value.

(Effect of this embodiment)
As described above, according to the biological sound detection device 10 according to the present embodiment, there are various states in the body (such as ascites, fat, and surgical scars), and the pathology and organs such as the intestine are not moving. For a patient (sick subject) and various subjects who do not distinguish between healthy and patient, (i) known adjustment sounds in the body for a certain period of time Whether or not the subject's body sound can be obtained and counted, and whether or not the subject can use the apparatus for detecting the body sound using the standard spectrum of a healthy person, and (ii) ) The threshold for determining whether or not a sound is a target biological sound is always fixed, or is not automatically determined by a doctor listening to the sound every time, but automatically set according to a certain standard. , Can eliminate measurement differences due to environment and examiner, (i i) By repeatedly determining whether or not a subject's body sound is a target body sound without considering complicated arithmetic processing while taking into consideration the influence of surrounding environmental sounds, and counting at regular intervals , The activity state of the living body can be monitored.

[Modification]
In one aspect, the biological sound detection device 10 may not include the environmental sound sensor unit 50. Even in that case, the body sound sensor 41 detects the body sound while the adjustment sound propagating apparatus 20 makes the adjustment sound resonate in the living body, and confirms whether the body sound can be detected. It is possible to determine whether or not the living body is a living body capable of detecting the target body sound. In this case, the biological sound detection device 10 may not include the environmental sound sensor selection unit 55 and the threshold change determination unit 59. The biological sound determination unit 60 may determine whether or not the detected biological sound is the target biological sound by comparing the determination matching coefficient with the threshold value recorded in the threshold value recording unit 58.

  Moreover, in one aspect, instead of providing a plurality of biological sound sensor units 40, only a plurality of biological sound sensors 41 may be provided, and other configurations of biological sound sensor units 40 or a part thereof may be common. Moreover, in one aspect, instead of providing a plurality of environmental sound sensor units 50, only a plurality of environmental sound sensors 51 may be provided, and other configurations of the environmental sound sensor unit 50 or a part thereof may be common.

  In one aspect, the body sound determination unit 60 may determine whether or not the body sound can be detected, and record the determination result in the log recording unit 61. That is, the biological sound determination unit 60 is able to detect the target biological sound from the biological sound detected by the biological sound sensor 41 with the adjustment sound resonating in the living body, or when the detected ratio is low. May determine that the living body is not capable of detecting the target biological sound.

  Moreover, in one aspect, the biological sound determination unit 60 may output the above-described various determination results to an external display unit or the like instead of or in addition to recording in the log recording unit 61.

  Further, in one aspect, all or part of the functions of the main control unit 30 may be realized by a server that can communicate with the biological sound detection device 10. Such a system is also an aspect of the biological sound detection device 10 according to the present embodiment.

  Moreover, in one aspect, the body sound determination unit 60 does not distinguish between a state where the adjustment sound is echoed in the living body and a state where the adjustment sound is not echoed in the living body, and the target body sound per unit time is not distinguished. The number of detections may be counted. Because it is known how to play the adjustment sound, the number of times that the adjustment sound is detected as the target biological sound can be predicted, and the number of detections of the target biological sound is predicted to detect the adjustment sound as the target biological sound. This is because when the number is less than the number of times, it can be determined that the living body is not capable of detecting the target biological sound.

[Example of software implementation]
The control block (particularly the main control unit 30) of the biological sound detection device 10 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or may be realized by software.

  In the latter case, the biological sound detection device 10 includes a computer that executes instructions of a program that is software that realizes each function. The computer includes, for example, at least one processor (control device) and at least one computer-readable recording medium storing the program. In the computer, the processor reads the program from the recording medium and executes the program, thereby achieving the object of the present invention. As the processor, for example, a CPU (Central Processing Unit) can be used. As the recording medium, a “non-temporary tangible medium” such as a ROM (Read Only Memory), a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. Further, a RAM (Random Access Memory) for expanding the program may be further provided. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. Note that one embodiment of the present invention can also be realized in the form of a data signal embedded in a carrier wave, in which the program is embodied by electronic transmission.

[Summary]
The biological sound detection device according to the first aspect of the present invention is a biological sound detection device (10) that detects a specific biological sound from a biological body, and is a biological sound detection unit (biological sound sensor 41) that detects the biological sound of the biological body. ) And an adjustment sound propagation unit (adjustment sound propagation device 20) that causes the adjustment sound to resonate in the living body.

  According to the above configuration, the biological sound is detected by the biological sound detection unit in a state where the adjustment sound is echoed in the living body by the adjustment sound propagation unit, and it is confirmed whether the biological sound can be detected. In the body sound detection device that detects a specific body sound, it is possible to determine whether or not the body is a body that can detect the specific body sound.

  The biological sound detection device according to aspect 2 of the present invention is the detection processing unit (main control unit 30) that performs the detection process of detecting the specific biological sound from the biological sound detected by the biological sound detection unit in the aspect 1. The detection processing unit further includes: a body sound detected by the body sound detection unit in a state where the adjustment sound propagation unit resonates the adjustment sound in the living body; and the adjustment sound propagation unit includes the in-vivo sound. The detection processing may be performed for each of the body sounds detected by the body sound detection unit in a state where the adjustment sound is not echoed.

  According to the above configuration, by performing detection processing on each of the body sound detected in a state where the adjustment sound is echoed in the living body and the body sound detected in a state where the adjustment sound is not echoed in the body, It can be suitably determined whether or not the living body is a living body capable of detecting the specific body sound.

  The biological sound detection apparatus according to aspect 3 of the present invention is the biological sound detection apparatus according to aspect 2, wherein the detection processing includes a frequency spectrum calculation process for calculating a frequency spectrum of the biological sound, a frequency spectrum of the biological sound, and the specific biological body. Matching coefficient calculation processing for calculating a plurality of matching coefficients by individually matching each of a plurality of standard frequency spectra of sound, and a matching for determination that determines a matching coefficient for determination based on the plurality of matching coefficients Coefficient determination processing and determination processing for determining whether or not the biological sound is the specific biological sound based on the determination matching coefficient.

  According to said structure, a specific biological sound can be detected suitably from a biological sound.

  The biological sound detection device according to aspect 4 of the present invention includes the plurality of biological sound detection units in the above aspect 3, and the detection processing calculates the frequency spectrum for the biological sound detected by each biological sound detection unit. Processing, the matching coefficient calculation process, and the determination matching coefficient determination process are individually performed, and it is selected which of the body sound detection units uses the determination matching coefficient obtained from the body sound detected in the determination process. A selection process may be further included.

  According to said structure, the detection omission of the body sound by the position of the body sound detection part can be suppressed.

  In the biological sound detection device according to aspect 5 of the present invention, in the aspect 3 or 4, in the determination process, the determination matching coefficient is accumulated, and the living body sound is based on the plurality of accumulated determination matching coefficients. It may be determined whether or not the sound is the specific biological sound.

  According to said structure, the influence of the unintended abnormal value can be excluded and a target biological sound can be detected with high precision.

  The biological sound detection device according to aspect 6 of the present invention further includes an environmental sound detection unit (environmental sound sensor 51) that detects environmental sound around the biological body in the above aspects 3 to 5, and the detection process includes By individually matching the second frequency spectrum calculation process for calculating the frequency spectrum of the environmental sound, the frequency spectrum of the environmental sound, and each of the plurality of standard frequency spectra of the specific biological sound, a plurality of second frequency spectra are calculated. A second matching coefficient calculation process for calculating a matching coefficient; and a second matching coefficient determination process for determination that determines a second matching coefficient for determination based on the plurality of second matching coefficients. Whether or not the biological sound is the specific biological sound based on the determination matching coefficient and the determination second matching coefficient. Or it may be a constant.

  According to said structure, the sound similar to a specific biological sound can be detected suitably from environmental sound. And it is possible to detect a specific biological sound with high accuracy by detecting the specific biological sound in consideration of whether a sound similar to the specific biological sound is included from the environmental sound.

  The biological sound detection device according to aspect 7 of the present invention includes the plurality of environmental sound detection units in the aspect 6 described above, and the detection processing is performed on the second frequency with respect to the environmental sound detected by each environmental sound detection unit. The spectrum calculation process, the second matching coefficient calculation process, and the determination second matching coefficient determination process are individually performed, and the determination second matching coefficient obtained from the environmental sound detected by any environmental sound detection unit It may further include a second selection process for selecting whether to use in the determination process.

  According to said structure, the detection omission of the environmental sound by the position of an environmental sound detection part can be suppressed.

  The biological sound detection device according to aspect 8 of the present invention is the biological sound detection apparatus according to aspect 6 or 7, wherein the determination process is such that the determination matching coefficient is equal to or greater than a first threshold value, and the determination second matching coefficient is a second value. When it is less than the threshold value, the biological sound may be determined as the specific biological sound.

  According to said structure, the sound (sound similar to a specific biological sound) which induces a false detection is not included in environmental sound, and the sound which can be judged as a specific biological sound is included in a biological sound The detected body sound can be determined as the specific body sound, and the specific body sound can be detected with high accuracy.

  The biological sound detection apparatus according to aspect 9 of the present invention is the biological sound detection apparatus according to aspect 8, wherein the detection processing unit performs the second frequency spectrum calculation process, the second matching coefficient calculation process, and the determination before performing the detection process. The second matching coefficient determination process may be performed, and the initial values of the first threshold and the second threshold may be determined based on the obtained second matching coefficient for determination.

  According to said structure, a specific biological sound can be detected with high precision by setting the initial value of a threshold value according to environmental sound.

  The biological sound detection device according to aspect 10 of the present invention is the determination sound obtained in the aspect 8 or 9, wherein the detection processing unit is obtained periodically or aperiodically while performing the detection processing. Based on the second matching coefficient, at least one of the first threshold and the second threshold may be changed.

  According to said structure, a specific biological sound can be detected with high precision by changing a threshold value according to environmental sound.

  The biological sound detection device according to aspect 11 of the present invention is the biological sound detection apparatus according to any one of aspects 3 to 10, wherein the detection processing unit determines whether the determination matching coefficient determined in the determination matching coefficient determination process is any standard frequency spectrum. Information indicating whether or not the information is obtained by matching may be recorded.

  According to said structure, further detailed information can be obtained about the specific biological sound detected.

  In the biological sound detection device according to aspect 12 of the present invention, in the above aspects 2 to 11, the detection processing unit may record the number of times the specific biological sound is detected in the detection processing.

  According to said structure, the change of a life activity state can be investigated suitably.

  In the biological sound detection device according to aspect 13 of the present invention, in the above aspects 1 to 12, the specific biological sound may be a peristaltic sound of the intestine.

  According to said structure, the peristaltic sound of an intestine can be detected suitably.

  The biological sound detection method according to the fourteenth aspect of the present invention is a biological sound detection method for detecting a specific biological sound from a living body by the biological sound detection device, and is detected as the specific biological sound by the biological sound detection device. An adjustment sound propagation step for causing the adjustment sound to resonate in the living body, a first detection step for detecting the living body sound of the living body in a state where the adjustment sound resonates in the living body, and the adjustment sound to resonate in the living body. And a second detection step of detecting a biological sound of the living body in a state where it is not.

  According to said structure, there exists an effect equivalent to the biological sound detection apparatus which concerns on aspect 1 of this invention.

  The biological sound detection device according to each aspect of the present invention may be realized by a computer. In this case, the biological sound detection device is operated by causing the computer to operate as each unit (software element) included in the biological sound detection device. The body sound detection program of the body sound detection apparatus for realizing the above in a computer and a computer-readable recording medium on which the body sound detection program is recorded also fall within the category of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 10 Body sound detection apparatus, 11 Playback part, 12 Propagation part, 20 Adjustment sound propagation apparatus (Adjustment sound propagation part), 30 Main control part (Detection processing part), 40 Body sound sensor unit, 41 Body sound sensor (Body sound detection) Part), 42 frequency spectrum calculation part, 43 matching coefficient calculation part, 44 individual sensor determination part, 45 biological sound sensor selection part, 51 environmental sound sensor (environmental sound detection part), 52 frequency spectrum calculation part, 53 matching coefficient calculation part 54 individual sensor determination unit 55 environmental sound sensor selection unit 57 frequency spectrum number recording unit 58 threshold recording unit 59 threshold change determination unit 60 biological sound determination unit 61 log recording unit

Claims (16)

A biological sound detection device for detecting a specific biological sound from a biological body,
A body sound detector for detecting the body sound of the body;
A biological sound detection device comprising: an adjustment sound propagation unit that causes an adjustment sound detected as the specific biological sound by the biological sound detection device to resonate in the living body. A detection processing unit that performs a detection process of detecting the specific biological sound from the biological sound detected by the biological sound detection unit;
The detection processing unit includes a biological sound detected by the biological sound detection unit in a state where the adjustment sound propagation unit resonates the adjustment sound in the living body, and the adjustment sound propagation unit includes the adjustment sound in the living body. The body sound detection device according to claim 1, wherein the detection process is performed for each of the body sounds detected by the body sound detection unit in a state where the body sound is not sounded. The detection process includes
A frequency spectrum calculation process for calculating a frequency spectrum of the biological sound;
A matching coefficient calculation process for calculating a plurality of matching coefficients by individually matching the frequency spectrum of the biological sound and each of the plurality of standard frequency spectra of the specific biological sound;
A determination matching coefficient determination process for determining a determination matching coefficient based on the plurality of matching coefficients;
The biological sound detection apparatus according to claim 2, further comprising: a determination process for determining whether or not the biological sound is the specific biological sound based on the determination matching coefficient. A plurality of the body sound detectors;
The detection process includes
For the body sound detected by each body sound detection unit, the frequency spectrum calculation process, the matching coefficient calculation process, and the determination matching coefficient determination process are individually performed,
4. The body sound according to claim 3, further comprising a selection process for selecting whether to use the determination matching coefficient obtained from the body sound detected by which body sound detection unit in the determination process. Detection device.   In the determination process, the determination matching coefficient is accumulated, and whether or not the biological sound is the specific biological sound is determined based on the accumulated plural matching coefficients for determination. The biological sound detection device according to claim 3 or 4. An environmental sound detection unit for detecting environmental sound around the living body;
The detection process includes
A second frequency spectrum calculation process for calculating a frequency spectrum of the environmental sound;
A second matching coefficient calculation process for calculating a plurality of second matching coefficients by individually matching the frequency spectrum of the environmental sound and each of the plurality of standard frequency spectra of the specific biological sound;
A determination second matching coefficient determination process for determining a determination second matching coefficient based on the plurality of second matching coefficients,
6. The determination process according to claim 3, wherein the determination process determines whether or not the biological sound is the specific biological sound based on the determination matching coefficient and the determination second matching coefficient. The biological sound detection device according to any one of claims. A plurality of the environmental sound detectors;
The detection process includes
For the environmental sound detected by each environmental sound detection unit, the second frequency spectrum calculation process, the second matching coefficient calculation process, and the determination second matching coefficient determination process are individually performed,
7. The method according to claim 6, further comprising a second selection process for selecting which of the environmental sound detected by the environmental sound detection unit is to use the second matching coefficient for determination obtained in the determination process. The biological sound detection device described.   The determination process determines that the biological sound is the specific biological sound when the determination matching coefficient is equal to or greater than a first threshold and the second matching coefficient for determination is less than a second threshold. The biological sound detection device according to claim 6 or 7, wherein   The detection processing unit performs the second frequency spectrum calculation process, the second matching coefficient calculation process, and the determination second matching coefficient determination process before performing the detection process, and obtains the second determination spectrum obtained. 9. The biological sound detection device according to claim 8, wherein initial values of the first threshold and the second threshold are determined based on a matching coefficient.   The detection processing unit performs the first threshold value and the second threshold value based on the obtained second matching coefficient for determination periodically or aperiodically while performing the detection process. The biological sound detection device according to claim 8 or 9, wherein at least one of them is changed.   The detection processing unit records information indicating which standard frequency spectrum the matching coefficient for determination determined in the determination matching coefficient determination process is obtained by matching. The biological sound detection device according to any one of claims 3 to 10.   The biological sound detection apparatus according to claim 2, wherein the detection processing unit records the number of times the specific biological sound is detected in the detection process.   The biological sound detection device according to any one of claims 1 to 12, wherein the specific biological sound is a peristaltic sound of the intestine. A biological sound detection method for detecting a specific biological sound from a living body by a biological sound detection device,
An adjustment sound propagation step for causing the adjustment sound detected as the specific biological sound by the biological sound detection device to resonate in the living body;
A first detection step of detecting a biological sound of the living body in a state where the adjustment sound is echoed in the living body;
A biological sound detection method comprising: a second detection step of detecting the biological sound of the living body in a state where the adjustment sound does not reverberate in the living body.   A biological sound detection program for causing a computer to function as the biological sound detection device according to any one of claims 2 to 12, wherein the biological sound detection program is for causing the computer to function as the detection processing unit.   The computer-readable recording medium which recorded the biological sound detection program of Claim 15.

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