JP2013113745A - Noise monitoring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise monitoring device which prevents generation of a noise by making a user aware of the noise instead of using a partition material excellent in sound insulating properties while allowing easy installation of the device in an existing building.SOLUTION: An evaluation device 10 includes: a solid sound detection part 11 for detecting a footstep sound generated in a room from an output of a sound sensor 20; a distance estimation part 13 for obtaining a distance to the generation location of the footstep sound; and a generated sound pressure estimation part 12 for estimating a sound pressure at the generation location of the footstep sound. The evaluation device 10 has: a transmitted sound pressure estimation part 14 for estimating a sound pressure of a sound wave transmitted to a lower floor from the sound pressure estimated by the generated sound pressure estimation part 12 by using the relationship between the sound pressure of the footstep sound and the sound pressure of the sound wave transmitted to the lower floor; a comparison and determination part 15 for comparing the sound pressure in the lower flower estimated by the transmitted sound pressure estimation part 14 with a specified threshold so as to evaluate the sound pressure in the lower floor and cause a notification device 30 to output the evaluation result; and a parameter setting part 16 for setting parameters including a slab specification of the building in order to select a relationship to be used by the transmitted sound pressure estimation part 14.

Description

  The present invention relates to a noise monitoring device that visualizes and reports the influence of noise generated in a room on the surroundings.

  Generally, sound generated in a space partitioned by a partition material such as a wall material or a floor material may be transmitted to an adjacent space through the partition material. That is, when the space where the sound is generated is a room such as a dwelling unit in a housing complex, a room that is a section in the house, or a room such as a soundproof room that forms a section in the room In addition, sound may be transmitted to an adjacent space, which is a space outside the room. Sound transmitted to the adjacent space is sometimes recognized as noise by a person in the adjacent space. Therefore, the sound transmitted to the person in the adjacent space is required to have a sound pressure level of 40 dB or less, for example.

  In order to solve this type of problem, various techniques for improving sound insulation in partition materials such as wall materials and floor materials have been proposed (see, for example, Patent Documents 1 and 2).

  In addition, there is a case where the user is not aware of the noise generated from the room and does not notice that the noise is generated. On the other hand, there are also many people who care about the magnitude of noise generated from their room and transmitted to the adjacent space.

  From the above situation, it is desired to estimate the magnitude of noise transmitted from the room to the adjacent space. As this type of technology, a configuration is also known in which vibration of the floor, which is a partition material, is detected, the magnitude of the vibration is converted into a noise value, and a warning message is output when the noise value is greater than a threshold value. (For example, see Patent Document 3).

Japanese Patent Laid-Open No. 9-195490 JP 2007-205071 A JP 2006-29859 A

  As in the techniques described in Patent Documents 1 and 2, it is an effective means to use a partition material that enhances sound insulation, but partition materials that enhance sound insulation are generally expensive and costly. Have a problem. Further, even if an expensive partitioning material having excellent sound insulation is used, it is difficult to eliminate the sound transmitted to the adjacent space, so there is a possibility that noise is transmitted to the adjacent space.

  On the other hand, if a technique for detecting the vibration transmitted to the partition material, estimating the magnitude of the noise from this vibration and outputting a warning message, as in the technique described in Patent Document 3, the adjacent space is used. It becomes possible to be aware of the transmitted noise. In addition, compared to the case of using a partition material having excellent sound insulation, it is considered that it is possible to realize noise at a lower cost. Moreover, since there is an effect of suppressing the act of generating noise, the possibility that noise is transmitted to the adjacent space can be greatly reduced.

  However, in order to adopt the technique described in Patent Document 3, in order to detect the vibration transmitted to the partition material, an impact force or vibration is detected inside the partition material such as a floor material, a ceiling material, or a wall material. It is necessary to arrange a sensor for this. For this reason, since a dedicated partition member is required, the cost is high, and there is a problem that it can be installed only at the time of new construction or renovation.

  It is an object of the present invention to provide a noise monitoring device that suppresses the generation of noise by making noise aware instead of using a partition material having excellent sound insulation properties, and that can be easily installed in an existing building. To do.

  The present invention relates to a sound sensor that detects sound generated in a room of a building, and an evaluation that detects a solid sound using the output of the sound sensor and evaluates a sound pressure of a sound wave transmitted to the lower floor due to the solid sound. And a notification device for notifying the room of an evaluation result of the evaluation device, the evaluation device detecting a solid sound generated on the floor of the room from an output of a sound sensor, and a solid sound detection A distance estimation unit that calculates the distance to the solid sound generation position detected by the unit, and a generated sound pressure estimation unit that estimates the sound pressure at the solid sound generation position from the distance obtained by the distance estimation unit and the output of the sound sensor And the sound pressure transmitted to the lower floor from the sound pressure estimated by the generated sound pressure estimating section using the relationship between the sound pressure of the solid sound generated on the floor of the room and the sound pressure of the sound wave transmitted to the lower floor. The transmission sound pressure estimation part that estimates the sound pressure and the sound pressure of the lower floor estimated by the transmission sound pressure estimation part are specified. A parameter including the slab specification of the building for selecting the relation used by the comparison and determination unit for evaluating the sound pressure of the lower floor by comparing with the value and notifying the evaluation result from the notification device, and the transmission sound pressure estimating unit. And a parameter setting unit to be set.

  In this noise monitoring apparatus, it is preferable that the solid sound detection means detects footsteps as solid sounds based on the kurtosis of the amplitude and the frequency distribution in the output waveform of the sound sensor.

  In this noise monitoring apparatus, it is preferable that the threshold value of the comparison / determination unit is set based on the minimum audible value in the frequency range of solid sound and the sound pressure of background noise detected by the sound sensor.

  In this noise monitoring apparatus, it is preferable that the sound sensor includes a plurality of microphones, and the distance estimation unit obtains a distance to a solid sound generation position based on a time difference in which sound waves are incident on the microphones.

  According to the configuration of the present invention, it is possible to suppress the generation of noise by making noise consciousness instead of using a flooring material excellent in sound insulation, and to easily install in an existing building. .

It is a block diagram which shows embodiment. It is a figure which shows the operation example same as the above. It is a figure which shows the relationship between a sound pressure and distance. It is a figure which shows the frequency characteristic of the minimum audible value. It is a front view which shows an external appearance same as the above.

  In the embodiment described below, a neighboring house in a dwelling unit in an apartment house is exemplified as an adjacent space. The technical idea of this embodiment can be applied. That is, the “adjacent space” means a house separated by a partition material such as a wall or a floor, a room that is a section in the house, an outer space of a section (such as a soundproof room) provided in the room, and the like. In the case of an apartment house, the adjacent space includes not only dwelling units adjacent on the same floor, but also dwelling units located either on the upper or lower side on different floors. Of the upper and lower floor units, the lower floor units are particularly important.

  The present embodiment focuses on solid sound among noises transmitted between the upper floor and the lower floor. Solid sound includes floor impact sound, door opening / closing sound, etc. In this embodiment, footstep sound belonging to floor impact sound is assumed as solid sound, and footstep sound is passed through flooring, slab, ceiling material to the lower floor dwelling unit. The case where it is transmitted will be described as an example. That is, as shown in FIG. 2, description will be made assuming a room 1a that generates footsteps and a lower floor room 1b in which footsteps from the room 1a are transmitted as noise. The room 1a includes a sound sensor 20 that detects sound generated in the room, an evaluation device 10 that evaluates whether the solid sound generated in the room 1a becomes noise to the room 1b on the lower floor, and the evaluation device 10. A notification device 30 that notifies the evaluation result.

  As will be described later, the evaluation device 10 analyzes the sound detected by the sound sensor 20, and evaluates the degree to which the person in the other room 1b can hear the sound. Furthermore, the evaluation apparatus 10 determines whether or not the sound generated in the room 1a may be heard as noise by a person in another room 1b. The notification device 30 notifies the person in the room 1a of the evaluation result of the evaluation device 10, and in the evaluation device 10, the sound generated in the room 1a may be transmitted as noise to a person in the other room 1b. When it is determined that, it is notified. That is, by visualizing the generation of noise, it is possible to make the person in the room 1a notice the generation of noise from the room.

  As the notification device 30, it is possible to select a notification lamp that only turns on and off, a notification lamp that changes color, a display that displays characters and figures, a combination thereof, and the like. For example, it is possible to adopt a configuration in which a notification lamp is always turned off and is turned on when it is determined as noise. Alternatively, if a liquid crystal display with a backlight is used as a display for displaying characters, it is always non-displayed. It is possible to adopt a configuration for lighting.

  The notification device 30 may be configured to notify audibly rather than visually. That is, the notification device 30 may be configured to notify the evaluation result of the evaluation device 10 using a notification sound or a voice message. For example, when the evaluation device 10 determines that noise is generated, a configuration for outputting a beep sound or a configuration for notifying by a voice message can be adopted as the notification device 30. Furthermore, you may employ | adopt the notification apparatus 30 which combines visual notification and auditory notification.

  The sound sensor 20 includes a plurality of microphones 21 (see FIG. 5). By using the plurality of microphones 21, the evaluation apparatus 10 can estimate the sound generation position based on the sound pressure and phase of the sound wave incident on each microphone 21. A technique for estimating the sound generation position will be described later. The microphone 21 may be of any operating principle, but is generally selected from a capacitor type, a dynamic type, and a piezoelectric type.

  It is desirable that three or more microphones 21 constituting the sound sensor 20 are provided apart from each other in order to detect the sound generation position in the room 1a. However, if the sound sensor 20 is arranged on the wall surface of the room 1a and the distance to the floor is known, the distance from the position immediately below the sound sensor 20 to the sound generation position can be obtained by arranging the two microphones 21 up and down. Can be obtained. If the distance to the sound generation position is known, the sound pressure at the sound generation position can be estimated from the sound pressure detected by the sound sensor 20 and the distance to the sound generation position. In order to accurately obtain the distance to the sound generation position, it is desirable that the distance between each pair of adjacent microphones 21 is large, but in consideration of the size allowed for the sound sensor 20, it is usually set to about 5 to 30 cm. Is done.

  In the following description, it is assumed that the sound sensor 20 includes three microphones 21 and the microphones 21 are arranged so as to be positioned at the vertices of a triangle on one plane. The microphones 21 need not be arranged in a straight line (that is, they need only be positioned at the vertices of the triangle), but the microphones 21 are preferably arranged at the vertices of the regular triangle. In particular, it is preferable that the remaining two vertices are arranged in line-symmetric positions across a vertical line passing through one vertex of the equilateral triangle.

  The evaluation apparatus 10 is configured using a digital signal processing device including a processor selected from a microcomputer, a digital signal processor (DSP), a field programmable gate array (FPGA), and the like. That is, the evaluation apparatus 10 executes a program for realizing the following functions. Further, the evaluation device 10 includes an analog-digital converter (not shown) for converting the output of the sound sensor 20 into a digital signal.

  As shown in FIG. 1, the evaluation device 10 includes a solid sound detection unit 11 that detects footsteps as solid sounds using an output signal of the sound sensor 20. The solid sound detection unit 11 extracts a required feature amount from the output signal of the sound sensor 20, and then detects a footstep as a solid sound using the extracted feature amount and calculates a sound pressure of the footstep. The feature quantity extracted from the output signal of the sound sensor 20 by the solid sound detection unit 11 is selected from the amplitude (signal power) of the output signal of the sound sensor 20, the kurtosis of the amplitude, the frequency distribution (spectral intensity ratio), and the like. A technique for detecting footsteps using this type of feature quantity is a known technique (for example, Taro Kashimura, three others, a study on a method for detecting footsteps in an indoor environment, IEICE Technical Report, pp.1- 6, SIS 2007-81 (2008-3)). In the present embodiment, footsteps are detected as solid sounds. However, the solid sound detector 11 detects a specific sound generated on the floor surface in addition to the footsteps, such as when a ball is bounced on the floor. It is good.

  By the way, the sound pressure of the footsteps input to the sound sensor 20 changes according to the distance between the place where the footsteps are generated and the sound sensor 20. Therefore, in order to estimate the footsteps transmitted to the lower floor, it is necessary to evaluate the sound pressure at the place where the footsteps are generated. Therefore, the evaluation device 10 includes a generated sound pressure estimation unit 12 that estimates the sound pressure at the footstep generation position for the footsteps detected by the solid sound detection unit 11. The generated sound pressure estimation unit 12 corrects the sound pressure of the footsteps obtained from the output of the sound sensor 20 by the distance to the footstep generation position estimated by the distance estimation unit 13 described later, and the footstep sound at the footstep generation position. Estimate the pressure.

  That is, since the sound pressure of the footsteps becomes smaller as the distance from the position where the footsteps are generated to the sound sensor 20, the generated sound pressure estimation unit 12 defines the relationship between the distance and the sound pressure by actual measurement or theoretical formula. Thus, it is possible to estimate the sound pressure at the place where the footsteps are generated. Here, it is considered that the smaller the room 1a, the less the attenuation of the sound pressure with respect to the distance change, and the longer the reverberation time of the room 1a, the less the attenuation of the sound pressure with respect to the distance change.

  Therefore, the evaluation value obtained from the volume of the room 1a and the reverberation time is associated with the attenuation characteristic of the sound pressure with respect to the distance. Specifically, using the evaluation value “R value” obtained from the volume of the room 1a and the reverberation time, the sound pressure attenuation characteristics with respect to the distance are classified for each R value as shown in FIG. The R value becomes smaller as the volume of the room 1a is smaller and the reverberation time is longer. In a general residential room 1a, the R value is about 20-50.

  The R value is obtained from the volume of the room 1a and the reverberation time. In order to obtain the sound pressure of the footsteps at the place where the footsteps are generated, it is necessary to obtain the distance from the sound sensor 20 to the place where the footsteps are generated. Therefore, the evaluation apparatus 10 includes a distance estimation unit 13 that estimates the distance from the output of the sound sensor 20 to the sound generation position. The distance estimation unit 13 of the present embodiment obtains a three-dimensional coordinate position in the coordinate system defined in the evaluation device 10 for the footstep detected by the solid sound detection unit 11, and a footstep generation position from the sound sensor 20 based on this coordinate position. Find the distance to.

  The distance estimation unit 13 employs, for example, a 2D-CSP method (Two-Dimensional Cross-Power Spectrum Phase Analysis) in order to estimate a sound generation position using a sound wave incident on the microphone 21. Since the 2D-CSP method assumes that the sound wave incident on the sound sensor 20 is a spherical wave, the sound generation position is accurately detected even when the sound generation position is relatively close to the sound sensor 20. Details of the 2D-CSP method can be found in the literature (Kohei Hayashida et al., “Evaluation of 2D-CSP method for local sound source localization”, IEICE Technical Report, SIP2010-09, pp.49-54, Electronic Information (Communication Society).

  Since the distance estimation unit 13 specifies the footstep generation position as a three-dimensional relative position to the sound sensor 20 using the output of the sound sensor 20, the distance from the footstep generation position to the sound sensor 20 is obtained. Therefore, the generated sound pressure estimating unit 12 can calculate the sound pressure at the place where the footstep sound is actually generated by using the distance to the footstep generating place obtained by the distance estimating unit 13. In other words, the generated sound pressure estimation unit 12 uses the sound pressure obtained by the solid sound detection unit 11 and the distance to the footstep generation location obtained by the distance estimation unit 13 to actually measure the place where the footsteps are generated. Estimate the sound pressure.

  By the way, footsteps generated in the room 1a are transmitted to the lower floor room 1b through a path passing through the floor and the slab. Therefore, a sound wave transmission path from the floor to the slab, and a sound wave transmission path from the slab to the room 1b. Can be divided. Regarding the sound wave transmission path from the slab to the room 1b, there is known a mathematical formula for estimating the sound pressure transmitted to the room 1b from the vibration acceleration of the slab. Therefore, if the vibration acceleration of the slab is known, the sound pressure in the room 1b can be estimated.

  Formulas for estimating the sound pressure of sound transmitted from the slab to the room 1b have been proposed, such as the impedance method. The frequency of the transmitted sound, the slab specifications (slab thickness dimensions, the area facing the room 1b, etc.), The ceiling specification of the room 1b on the floor is used as a parameter. That is, the sound pressure of the sound transmitted from the slab to the room 1b can be calculated based on the building specifications.

  On the other hand, the relationship between the sound pressure of footsteps generated in the room 1a and the vibration acceleration of the slab is not formulated. However, the relationship between the sound pressure of footsteps and the vibration acceleration of the slab has been obtained as a result of experiments and has been found to be approximated by a linear relationship. Therefore, it is possible to estimate the vibration acceleration of the slab by setting a coefficient value corresponding to the presence or absence of the carpet and the L value (impact sound performance grade) of the flooring, and multiplying the sound value of the footstep by this coefficient value. Become.

  In recent years, since a system for displaying house performance such as a house performance display system and a building environment comprehensive performance evaluation system (CASBEE) has become widespread, the L value can be obtained relatively easily from the drawing information. Further, the L value may be obtained by actual measurement. The L value measurement method is defined as a JIS standard (JIS A1418).

  As described above, the relationship between the sound pressure of footsteps generated in the upper floor room 1a and the sound pressure of sound waves transmitted to the lower floor room 1b is set with a small number of parameters such as slab specifications and the presence / absence of carpet. It is possible to determine by doing. In order to set such parameters, the evaluation apparatus 10 includes a parameter setting unit 16. The parameter setting unit 16 is also used to variably set the L value. The parameter setting unit 16 uses a switch having a mechanical contact such as a DIP switch or a memory constituting a memory switch. When using a memory switch, a setting device provided separately is connected to set the contents of the memory switch. Here, the setting device may be selected from a computer, a tablet terminal, a smart phone, and the like that are operating by executing an appropriate program in addition to the dedicated machine.

  Since the relationship between the sound pressure of footsteps in the upper floor room 1a and the sound pressure transmitted to the lower floor room 1b is not a simple regression equation, it is desirable to perform a polygonal line approximation. When the polygonal line approximation is performed, a data table in which a plurality of sound pressure values related to footsteps in the room 1a are associated with sound pressures in the room 1b is generated. Further, the sound pressure in the lower floor room 1b with respect to the sound pressure value of footsteps in the upper floor room 1a is calculated by performing an interpolation operation using a data table.

  The calculation for calculating the sound pressure transmitted to the lower floor room 1b from the sound pressure of the footsteps in the upper floor room 1a is performed by the transmitted sound pressure estimation unit 14 provided in the evaluation apparatus 10. That is, since the sound pressure of the footsteps in the upper floor room 1a is obtained in the generated sound pressure estimating unit 12 based on the sound wave detected by the sound sensor 20, as described above, the transmitted sound pressure estimating unit 14 Using the output value of the generated sound pressure estimation unit 12, the sound pressure of the sound wave transmitted to the room 1b on the lower floor is calculated.

  As described above, when the footsteps generated in the room 1a are detected using the output of the sound sensor 20 in the solid sound detection unit 11, the distance and sound estimated by the distance estimation unit 13 using the output of the sound sensor 20 are detected. Based on the output of the sensor 20, the generated sound pressure estimation unit 12 estimates the sound pressure at the footstep generation location. The sound pressure of the footsteps estimated by the generated sound pressure estimation unit 12 is input to the transmission sound pressure estimation unit 14, and the sound pressure of the sound wave transmitted to the lower floor room 1b is estimated.

  The evaluation device 10 includes a comparison / determination unit 15 for determining whether or not the sound pressure of the sound wave transmitted to the lower floor room 1b is noisy for a resident in the lower floor room 1b. The comparison determination unit 15 sets a threshold value for the sound pressure based on the minimum audible value of the person. If the threshold value exceeds the set threshold value, the comparison determination unit 15 determines that noise is generated for a resident in the room 1b on the lower floor. When the comparison determination unit 15 determines that noise is generated, the notification device 30 notifies the resident in the room 1a on the upper floor that noise has occurred. In other words, the user is alerted by notifying the inhabitant of the upper floor room 1a that the footsteps generated in the upper floor room 1a are the noise of the lower floor room 1b.

  Here, the minimum audible value of a person is expressed as a frequency characteristic with respect to the sound pressure of a pure tone in an environment where no noise exists. Further, since there is an individual difference in the minimum audible value, the minimum audible value is statistically determined according to the ratio of the number of people. That is, as shown in FIG. 4, the boundary value between audible and non-audible is set as the minimum audible value, and the minimum audible value is determined for each ratio of the number of persons who obtained the boundary value. For example, a characteristic with a minimum audible value of 1% means that the number of people who can obtain this characteristic is 1% of the whole, and a characteristic of the minimum audible value of 50% has the number of people who can obtain this characteristic of 50% of the whole. Means%. In other words, the lower the characteristic in FIG. 4, the smaller the number of people who make that characteristic the minimum audible value.

  As described above, since the threshold value set in the comparison determination unit 15 is set based on the minimum audible value, it is determined whether the threshold value is set as the threshold value when the percentage is audible for a person. 16 is set. The ratio set in the parameter setting unit 16 may be 50%, for example.

  Further, since the frequency components of footsteps are concentrated in a frequency range of approximately 50 to 500 Hz, the threshold is determined using the minimum audible value in this frequency range. Furthermore, since the sound pressure that becomes the minimum audible range varies depending on the frequency, the representative value of the sound pressure in the frequency range described above is used as a threshold value. As the representative value, the minimum value or the average value of the sound pressure in the frequency range described above is used.

  By the way, if the threshold value in the comparison / determination unit 15 is set based only on the minimum audible value, either the time zone in which the sound pressure of the environmental sound (background noise) is relatively high or the time zone in which the sound pressure of the environmental sound is relatively low is selected. The same threshold value is applied to. In general, it is highly possible that the sound pressure of the environmental sound is low even when the sound pressure of the environmental sound is low. Therefore, it is desirable to adjust the threshold according to the sound pressure of the environmental sound.

  Therefore, it is preferable that the comparison determination unit 15 has a function of adjusting the threshold based on the measurement result for each time zone regarding the sound pressure of the environmental sound in the field. That is, the threshold value of the comparison determination unit 15 is set higher as the sound pressure of the environmental sound is higher according to the time zone. Thus, by dynamically setting the threshold value according to the time zone, it is accurately evaluated whether or not footsteps generated in the upper floor room 1a are felt as noise by the residents in the lower floor room 1b. become. Specifically, the comparison / determination unit 15 determines a threshold value for air sound using a known M ′ curve corresponding to the sound pressure of the environmental sound. That is, the threshold value for the air sound is determined by applying the sound pressure of the environmental sound measured in advance or the sound pressure of the environmental sound based on the residential area information established by the Ministry of the Environment to the M ′ curve.

  The evaluation device 10, the sound sensor 20, and the notification device 30 are provided in one container 40, for example, as shown in FIG. The container 40 is assumed to be attached to the wall surface of the room 1a. Therefore, when the preceding wiring is possible, a part of the container body 40 is embedded in the wall surface, and power is supplied from the power line wired in the wall, like the embedded wiring device. Moreover, when using a battery as a power source, if the battery is built in the container 40, the container 40 can be disposed at a desired position on the wall surface.

  The sound sensor 20 and the notification device 30 are disposed on the front surface of the container body 40. The front surface of the container 40 is formed in a square shape with corners dropped. Further, the three microphones 21 of the sound sensor 20 are arranged at positions that are the vertices of an equilateral triangle. The two microphones 21 are arranged near both ends of the lower side on the front surface of the container body 40. The remaining one microphone 21 is arranged at the upper part of the front surface of the container body 40.

  In the configuration example shown in FIG. 5, a notification lamp including an LED or an organic EL light source is used as the notification device 30. It is desirable that the lighting state of the notification device 30 can be changed. The lighting state may be expressed separately by continuous lighting and flashing lighting, or may be expressed by a dimming level, a light emission color, or the like. Further, the comparison / determination unit 15 may classify the degree of noise into three or more levels as well as a two-level determination as to whether or not noise is generated in the room 1b on the lower floor. For example, the sound pressure of noise is set to three levels of “large”, “medium”, and “small”, and the notification device 30 is red when “large”, yellow when “medium”, and yellow when “small”. It can be turned off. The lighting state may be about 5 seconds after the determination result of the comparison determination unit 15 changes.

  If this configuration is adopted, the sound pressure transmitted to the room 1b on the lower floor is expressed step by step depending on the lighting state of the LED or the organic EL light source provided in the notification device 30, for example, a step of performing a preliminary warning. It is possible to divide the notification into the actual warning stage. That is, when there is a possibility that footsteps are transmitted to the lower floor room 1b and become noise, the resident of the upper floor room 1a is notified by the lighting state of the notification device 30.

  The sound insulation performance of the flooring is known to depend on the frequency. Therefore, when estimating the amount of sound transmitted to the room 1b on the lower floor, if the frequency component is also taken into consideration, the accuracy of the estimation It is possible to increase.

DESCRIPTION OF SYMBOLS 1a room 1b room 10 Evaluation apparatus 11 Solid sound detection part 12 Generated sound pressure estimation part 13 Distance estimation part 14 Transmission sound pressure estimation part 15 Comparison determination part 16 Parameter setting part 20 Sound sensor 21 Microphone 30 Notification apparatus 40 Body

Claims (4)

A sound sensor for detecting sound generated in a building room;
An evaluation device that detects solid sound using the output of the sound sensor and evaluates the sound pressure of the sound wave transmitted to the lower floor due to the solid sound; and
A notification device for notifying the room of the evaluation result of the evaluation device;
The evaluation device is
A solid sound detector for detecting solid sound generated on the floor of the room from the output of the sound sensor;
A distance estimation unit for obtaining a distance to the position where the solid sound detected by the solid sound detection unit is detected;
A generated sound pressure estimating unit that estimates the sound pressure at the generation position of the solid sound from the distance obtained by the distance estimating unit and the output of the sound sensor;
Sound of sound waves transmitted to the lower floor from the sound pressure estimated by the generated sound pressure estimation unit using the relationship between the sound pressure of solid sound generated on the floor of the room and the sound pressure of sound waves transmitted to the lower floor A transmission sound pressure estimation unit for estimating pressure,
A comparison / determination unit that evaluates the sound pressure of the lower floor by comparing the sound pressure of the lower floor estimated by the transmission sound pressure estimation unit with a prescribed threshold value, and notifies the evaluation result from the notification device;
A noise monitoring apparatus comprising: a parameter setting unit configured to set a parameter including a slab specification of the building in order to select the relationship used by the transmission sound pressure estimation unit.   2. The noise monitoring apparatus according to claim 1, wherein the solid sound detection means detects footsteps as solid sounds based on kurtosis of amplitude and frequency distribution in an output waveform of the sound sensor.   The threshold value of the comparison / determination unit is set based on a minimum audible value in a frequency range of solid sound and a sound pressure of background noise detected by the sound sensor. The noise monitoring device described.   The sound sensor includes a plurality of microphones, and the distance estimation unit obtains a distance to a solid sound generation position based on a time difference in which sound waves are incident on the microphones. The noise monitoring apparatus according to claim 1.

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