Transmission sound suppression device, transmission sound suppression system, transmission sound suppression method and program

Abstract

To provide a quiet environment for an indoor user.SOLUTION: A transmission sound suppression device includes: a sound collection part for collecting external sound including transmission sound of a specified band frequency outputted from a mobile body; a communication part for acquiring position information of the mobile body at previously determined transmission time intervals; a correction part for correcting the specified band frequency of the transmission sound by using the position information and calculating a corrected frequency; a signal generation part for generating a cancel signal having an inverse phase of the corrected frequency; and an output part for outputting the generated cancel signal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a transmitted noise suppression device, a transmitted noise suppression system, a transmitted noise suppression method, and a program. [Background technology]

[0002] There are technologies for creating a comfortable environment by eliminating various unpleasant noises that leak into a room from the outside. For example, according to the technology disclosed in Patent Document 1, noise is canceled by acoustically outputting into the room a sound that is in the opposite phase to the main component of the noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2011 / 030422 Summary of the Invention [Problem to be solved by the invention]

[0004] The following analysis was performed by the inventors of the present disclosure.

[0005] The purpose of the technology described in Patent Document 1 is not to cancel transmitted sounds such as warning sounds that are the basis for the driver inside the vehicle to decide on driving behavior, but to cancel other noises such as road noise, wind noise, and engine noise. The sounds to be canceled are not transmitted sounds that are generated regularly and continuously, and the source of the sounds is not moving relative to the vehicle. In other words, there is no relative velocity between the source of the sounds and the vehicle. Therefore, the existence of relative velocity does not cause a change in the frequency of sound waves, and this point is not taken into consideration.

[0006] Generally, the specifications of the transmitted sound emitted by a moving object, such as its fundamental frequency, are determined in advance. However, for users inside a building, the frequency changes as the moving object moves. For this reason, for example, even if a user inside a building wants to suppress the transmitted sound emitted by a moving object, even if the user has information such as the fundamental frequency of the transmitted sound, the user alone cannot reliably suppress the sound. In other words, a quiet environment cannot be provided to the user inside the building.

[0007] The present disclosure has been made in consideration of the above circumstances, and one of its objects is to contribute to providing a quiet environment for users indoors. [Means for solving the problem]

[0008] According to a first aspect of the present disclosure, a sound collection unit that collects external sounds including transmitted sounds of a specific frequency band output from a moving object; a communication unit that acquires location information of the mobile object at predetermined transmission time intervals; a correction unit that corrects the specific frequency band of the transmitted sound using the position information and calculates a corrected frequency; a signal generating unit that generates a cancellation signal having an opposite phase to the corrected frequency; and an output unit that outputs the generated cancellation signal.

[0009] According to a second aspect of the present disclosure, The above-mentioned transmitted noise suppression device; A transmitted noise suppression system is provided, which includes a location information transmission device that is mounted on the moving body and transmits the location information at predetermined time intervals.

[0010] According to a third aspect of the present disclosure, The computer Collects external sounds including transmitted sounds of specific frequency bands generated by moving objects, correcting the specific frequency band of the transmitted sound using position information of the moving body acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; A transmitted sound suppression method is provided that outputs the cancellation signal.

[0011] According to a fourth aspect of the present disclosure, On the computer, A procedure for collecting external sounds including transmitted sounds of a specific frequency band generated by a moving object; a step of correcting the specific frequency band of the transmitted sound by using position information of the moving object acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; and a program for executing the procedure of outputting the cancellation signal.

[0012] These programs can be recorded on a computer-readable storage medium. The storage medium can be a non-transitory medium such as a semiconductor memory, a hard disk, a magnetic recording medium, or an optical recording medium. The present disclosure can also be embodied as a computer program product. [Effects of the Invention]

[0013] The present disclosure can contribute to providing a quiet environment for users indoors. [Brief explanation of the drawings]

[0014] [Figure 1] 1A is an overall configuration diagram of an example of a transmitted noise suppression system according to the present disclosure, and FIG. 1B is a functional block diagram of an example of a transmitted noise suppression device according to the present disclosure. [Figure 2] 1A and 1B are diagrams for explaining the principle of transmitted sound suppression. [Figure 3] 1A and 1B are diagrams for explaining the principle of transmitted sound suppression according to the present disclosure. [Figure 4] 10 is a flowchart illustrating an example of a transmission sound suppression process according to the present disclosure. [Figure 5] 1A is a functional block diagram of an example of a transmission noise suppression device according to the present disclosure, and FIG. 1B is a functional block diagram of an example of a location information transmission device according to the present disclosure. [Figure 6] 1A is a diagram for explaining an example of a position and velocity database according to the present disclosure, and FIG. 1B is a diagram for explaining an example of a velocity component calculation method according to the present disclosure. [Figure 7] 10 is a flowchart illustrating an example of a transmission sound suppression process according to the present disclosure. [Figure 8] 1A is a functional block diagram of an example of a location information transmission device according to the present disclosure, and FIG. 1B is a diagram illustrating an example of a screen for receiving an operation instruction. [Figure 9] (a) is a functional block diagram of an example of a location information transmission device according to the present disclosure, (b) is a diagram illustrating an example of a screen for accepting adjustment instructions, and (c) is a diagram illustrating an example of an adjustment database. [Figure 10] FIG. 1 is a configuration diagram illustrating an example of a hardware configuration of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that reference numerals in the drawings are assigned to each element for convenience as an example to facilitate understanding, and are not intended to limit the present disclosure to the illustrated aspects. Furthermore, connecting lines between blocks in the drawings and the like referred to in the following description include both bidirectional and unidirectional lines. Unidirectional arrows are used to schematically indicate the flow of the main signal (data) and do not exclude bidirectionality. Furthermore, in the following description, "A and / or B" means A or B, or A and B.

[0016] <<First Embodiment>> An overview of this embodiment will be described. FIG. 1(a) is a diagram for explaining the overview of this embodiment. The transmitted sound suppression system 100 of this embodiment effectively suppresses transmitted sound of a specific band frequency that has regularity and continuity and is output from an outdoor moving object to an indoor user 109. Hereinafter, this embodiment will be described taking as an example a case where the outdoor moving object is an ambulance 101. Therefore, the transmitted sound is a siren sound 102.

[0017] The transmitted noise suppression device 200 of this embodiment acquires the siren sound 102 of the ambulance 101 heard from outside the building 103 and the movement status of the ambulance 101, and predicts how audible the siren sound 102 will be in the future. Based on the prediction result, an anti-phase sound is generated in real time as a cancellation signal 108 and output indoors. As a result, the siren sound 102 is suppressed by the cancellation signal 108, and the suppressed siren sound 102 reaches the ears of the indoor users 109.

[0018] As shown in the figure, the transmission sound suppression system 100 of this embodiment includes a transmission sound suppression device 200 and a location information transmission device 400. The transmission sound suppression device 200 is attached to, for example, a wall of a building 103. The location information transmission device 400 is installed in an ambulance 101.

[0019] The location information transmission device 400 transmits the location information 105 of the ambulance 101. The transmitted location information 105 is transmitted to the transmission noise suppression device 200 via a communication base station or the like 106.

[0020] The siren sound 102 output from the ambulance 101 is a sound wave with a known frequency that is emitted at a constant cycle. The transmitted noise suppression device 200 continuously collects external sounds, and if it determines that the external sounds include the siren sound 102, it generates a cancellation signal 108 that is in the opposite phase to the siren sound 102. At this time, the transmitted noise suppression device 200 calculates the delay time that occurs within the device from when the external sounds including the siren sound 102 are collected until when they are output as an internal device delay time, and generates and outputs the cancellation signal 108 taking this internal device delay time into account.

[0021] Furthermore, because the ambulance 101 continues to move until it reaches its destination, the frequency of the siren sound 102 that reaches the transmitted noise suppression device 200 changes due to the Doppler effect. The transmitted noise suppression device 200 of this embodiment receives location information 105 from the ambulance 101 at predetermined time intervals, and uses this information to correct the frequency of the siren sound 102 caused by the Doppler effect, thereby obtaining the corrected frequency.

[0022] The transmitted noise suppression device 200 generates and outputs an anti-phase sound wave based on the delay time within the device and the corrected frequency, thereby canceling out the siren sound 102 arriving from outside and suppressing the sound reaching the ears of the user 109.

[0023] To achieve this, the transmission sound suppression device 200 of this embodiment includes a sound collection unit 210, a communication unit 220, a correction unit 230, a signal generation unit 240, an output unit 250, and a memory unit 300, as shown in FIG. 1(b).

[0024] The sound collection unit 210 collects external sounds including a transmission sound (siren sound 102) of a specific frequency band output from a moving body (ambulance 101). In this embodiment, for example, the sound collection unit 210 collects external sounds at a predetermined time interval (sound collection time interval). Then, each time the sound collection unit 210 collects sound, it determines whether the collected external sounds include the siren sound 102. Here, for example, if the collected external sounds include sound waves having an intensity equal to or greater than a predetermined threshold, it determines that the siren sound 102 is included. In other words, the siren sound 102 is detected. The threshold is determined in advance and stored in the storage unit 300. At this time, information on the intensity of the siren sound 102 may be transmitted to the signal generation unit 240, which will be described later.

[0025] The communication unit 220 acquires the location information 105 transmitted from the ambulance 101 at predetermined time intervals (transmission time intervals) at the transmission time intervals. The acquired location information 105 is stored in the storage unit 300, for example, in association with the acquisition time. The communication unit 220 acquires the location information 105 via a communication I / F having an antenna, modem, etc. provided in the communication unit 220 itself.

[0026] The correction unit 230 corrects the frequency of the siren sound 102 using the position information 105 and calculates the corrected frequency. In this embodiment, the speed component of the ambulance 101 in the direction of the transmitted noise suppression device 200 is calculated based on the position information 105, and the speed component is used to calculate the change in frequency due to the Doppler effect, resulting in the corrected frequency. Note that specification information such as the frequency, output intensity, and output period of the siren sound 102 is stored in advance in the storage unit 300. For example, the siren sound 102 of the ambulance 101 is notified to have a high-pitched fundamental frequency of 960 Hz, a low-pitched fundamental frequency of 770 Hz, and a period of 0.65 seconds.

[0027] The signal generating unit 240 generates a cancellation signal 108 of the opposite phase to the corrected frequency. At this time, the signal generating unit 240 may take into account a pre-calculated internal device delay time. That is, the signal generating unit 240 predicts the corrected frequency and waveform of the siren sound 102 received by the transmission noise suppression device 200 after the internal device delay time, and generates a cancellation signal 108 of the opposite phase. The intensity of the generated cancellation signal 108 only needs to be equal to or less than the intensity of the collected siren sound 102. Note that the intensity of the collected siren sound 102 may be received from the sound collecting unit 210, as described above. The internal device delay time is calculated taking into account the distance within the device from the sound collecting unit 210 to the output unit 250, the time required for each process, the temperature, etc. Note that the internal device delay time may be calculated in advance at room temperature and stored in the storage unit 300.

[0028] The output unit 250 outputs the cancellation signal 108 generated by the signal generation unit 240 indoors.

[0029] The storage unit 300 stores various data necessary for processing. It also stores data generated by processing, data generated during processing, and the like. In this embodiment, as described above, the specifications of the siren sound 102, the delay time within the device, and the like are stored. As for the siren sound 102, various siren sounds 102 to be suppressed may be stored. In addition, the location information 105 of the ambulance 101 transmitted from the ambulance 101 is stored in association with the acquisition time.

[0030] [Suppression principle] Here, the principle of suppressing siren sound 102 will be explained. Sound waves are longitudinal waves that propagate through the air as compressional waves. When sound wave 501, which is made up of only a specific frequency, is graphed with the horizontal axis representing time and the vertical axis representing amplitude, it is expressed as shown in FIG. 2(a). When this sound wave 501 is combined with a cancellation signal 502 of opposite phase, sound wave 501 and cancellation signal 502 cancel each other out to produce combined wave 503, resulting in a sound wave with reduced intensity. In this case, as shown in this figure, if sound wave 501 and cancellation signal 502 have approximately the same amplitude (same intensity), combined wave 503 appears to disappear.

[0031] The actual siren sound 102 is not a simple harmonic wave, which is a wave of only a single frequency like the sound wave 501 described above. Instead, as shown in FIG. 2(b), it is a sound wave 504 composed of waves of multiple frequencies and exhibiting regularity and continuity. For example, the siren sound 102 is generated by adding an additional sound of a frequency different from the fundamental frequency to a sound wave of a frequency that is notified as the fundamental frequency, thereby reducing the intensity of the siren sound 102. The frequency components of the output siren sound 102 (sound wave 504) are publicly available. Therefore, based on this publicly available information, a cancellation signal 505 of the same amplitude but in opposite phase to the sound wave 504 can be generated and combined to generate a composite wave 506. In this case, too, by making the amplitudes of the sound wave 504 and the cancellation signal 505 approximately the same, they cancel each other out and disappear.

[0032] Furthermore, the ambulance 101 is moving. For this reason, even if the siren sound 102 is output at a constant frequency, the frequency of the sound waves received by the indoor user 109 will differ when the ambulance 101 is approaching and when it is moving away, as shown in FIG. 3(a). Furthermore, the intensity of the siren sound 102 will attenuate depending on the distance between the ambulance 101 and the transmitted noise suppression device 200 when the siren sound 102 is generated. At this time, the sound will be further attenuated as it passes through the building 103.

[0033] For example, FIG. 3(b) shows an example of a waveform shape 511 when the siren sound 102 having a waveform shape 510 made up of waves of a plurality of frequencies reaches the user 109.

[0034] In this embodiment, taking these factors into consideration, the frequency and intensity of the siren sound 102 that reaches the transmission noise suppression device 200 are calculated, and a cancellation signal 108 having a waveform shape 512 with approximately the same intensity and opposite phase is generated to suppress the siren sound 102.

[0035] [Transmitted sound suppression processing] Next, the flow of the transmitted sound suppression process of this embodiment will be described. Fig. 4 shows the processing flow of the transmitted sound suppression process of this embodiment. As described above, the ambulance 101 outputs the siren sound 102 of a predetermined frequency at a predetermined cycle. In the following, this embodiment will be described assuming that the transmitted sound suppression process is started when the sound collection unit 210 collects external sound at a predetermined sound collection time interval.

[0036] First, sound collection unit 210 determines whether or not the collected external sound includes siren sound 102, which is a transmitted sound, using the above-described method (step S1101). At this time, sound collection unit 210 may identify the intensity of collected siren sound 102 and notify signal generation unit 240. If not included, the process ends and the unit waits for sound collection at the next sound collection time.

[0037] On the other hand, if it is included, that is, if the sound collection unit 210 detects the siren sound 102, the correction unit 230 uses the location information 105 of the ambulance 101 acquired at the transmission time interval to calculate the frequency change due to the Doppler effect of the siren sound 102 and performs frequency correction to calculate the corrected frequency (step S1102).

[0038] The signal generating unit 240 generates the cancellation signal 108 having the opposite phase to the corrected frequency by the above method (step S1103). At this time, it is sufficient that the cancellation signal 108 has an intensity equal to or less than the intensity of the siren sound 102 extracted in step S1101.

[0039] Then, the output unit 250 outputs the generated cancellation signal 108 (step S1104), and the process ends.

[0040] The transmitted sound suppression device 200 executes the above process each time the sound collection unit 210 collects external sound at the sound collection time interval.

[0041] As described above, the transmitted noise suppression device 200 of this embodiment generates and outputs an antiphase signal of the siren sound 102, taking into consideration not only the delay time but also the change in frequency caused by the movement of the ambulance 101. Therefore, it is possible to accurately cancel periodic and continuous transmitted noise such as the siren sound 102.

[0042] Emergency vehicles such as ambulances 101 are required to sound their sirens and turn on their red fluorescent lights in accordance with the Road Traffic Act. For this reason, they continue to drive with their sirens blaring even in the middle of the night. However, among emergency vehicles, it is sufficient for ambulances 101 to be able to detect their movement at the very least only to those waiting for the ambulance 101 and those who may be in danger of obstructing traffic. It is desirable to provide an environment with reduced siren noise for those who do not need to know that an ambulance 101 is approaching.

[0043] However, conventional soundproofing devices with noise cancellation function take the form of headphones or the like, which the user 109 must wear. Furthermore, since they suppress not only the siren sound 102 but also other sounds, the user 109 may miss important everyday sounds. However, the transmitted sound suppression device 200 of this embodiment is attached to a wall or the like, so the user 109 does not need to wear a suppression device. Furthermore, since it specifically suppresses only the siren sound 102, it has higher suppression accuracy than general soundproofing devices with noise cancellation function, and the user 109 will not miss everyday sounds. Furthermore, the user is freed from the hassle of having to wear the device at all times when using the device.

[0044] Furthermore, even if the user 109 is moving around indoors, the transmission sound suppression device 200 can use a human presence sensor or the like to determine the distance between the transmission sound suppression device 200 and the user 109 and the movement status of the user 109, and generate the optimal suppression sound.

[0045] Therefore, the transmitted noise suppression device 200 of this embodiment can provide a quiet environment to the user 109 who is indoors.

[0046] <<Second embodiment>> Next, a second embodiment of the present disclosure will be described. This embodiment is an embodiment that embodies the first embodiment in more detail. In this embodiment, components with the same names as those in the first embodiment basically have the same functions as those in the first embodiment. Hereinafter, this embodiment will be described, focusing on the differences from the first embodiment.

[0047] The transmission sound suppression system 100 of this embodiment basically has the same configuration as the transmission sound suppression system 100 of the first embodiment shown in Fig. 1(a). However, in this embodiment, a transmission sound suppression device 200a is provided instead of the transmission sound suppression device 200. Therefore, the transmission sound suppression system 100 of this embodiment is provided with the transmission sound suppression device 200a and a location information transmission device 400. Like the transmission sound suppression device 200, the transmission sound suppression device 200a is attached to, for example, a wall of the building 103. Furthermore, the location information transmission device 400 is installed in the ambulance 101.

[0048] [Transmission noise suppression device] As shown in FIG. 5(a), the transmission sound suppression device 200a of this embodiment includes a sound collection unit 210, a communication unit 220, a correction unit 230, a signal generation unit 240, an output unit 250, a velocity calculation unit 260, an intensity calculation unit 270, and a memory unit 300.

[0049] The sound collection unit 210, communication unit 220, correction unit 230, signal generation unit 240, and output unit 250 have the same functions as the components with the same names in the first embodiment. Hereinafter, this embodiment will be described, focusing on the components that are different from the first embodiment.

[0050] The sound collection unit 210 of this embodiment collects external sounds including the siren sound 102, which is a transmission sound of a specific frequency band output from an ambulance 101, as in the first embodiment.

[0051] In this embodiment, the sound collection unit 210 performs constant monitoring. That is, it continuously collects surrounding sounds as external sounds at predetermined sound collection time intervals for a predetermined sound collection period. Then, each time it collects a sound, it determines whether the sound contains a siren sound 102. In this embodiment, for example, if the collected sound has an intensity equal to or greater than a predetermined threshold, the sound collection unit 210 determines that the sound contains a siren sound 102. The threshold used is predetermined and stored in the storage unit 300.

[0052] As in the first embodiment, the communication unit 220 acquires the position information 105 of the ambulance 101 at predetermined transmission time intervals. As described above, the ambulance 101 moves and stops. The position information transmission device 400 of the ambulance 101 continuously outputs the position information 105 of the vehicle at the transmission time intervals. Each time the communication unit 220 receives this position information 105, it associates it with the time of reception and records it in the position and speed database 310. An example of the position and speed database 310 is shown in FIG. 6(a).

[0053] As shown in the figure, the position and speed database 310 includes a reception time storage field 311, a position information storage field 312, a speed storage field 313, and a speed component storage field 314. Received position information 105 is stored for each reception time. The position information 105 may be expressed, for example, as latitude, longitude, and altitude. In the example of the figure, a case is illustrated in which t0 is stored as the reception time when the position information 105 (p0) was first received.

[0054] The speed calculation unit 260 calculates the speed v of the ambulance 101 based on the location information 105 transmitted from the ambulance 101 at the transmission time interval. For example, each time the speed calculation unit 260 receives location information 105, the speed calculation unit 260 calculates the speed v at the time of reception using the location information 105, the location information 105 received immediately before, and the transmission time interval. Specifically, the speed calculation unit 260 uses the received location information 105 and the location information 105 received immediately before to calculate the travel distance D of the ambulance 101 at both times, and divides the travel distance D by the transmission time interval ΔT1 to calculate the speed v.

[0055] The speed v calculated by the above calculation formula is the speed v in the direction of movement of the ambulance 101. As shown in FIG. 6(b), as the ambulance 101 travels down the road, the angle between its direction of movement and the transmitted noise suppression device 200a changes. In this figure, each shaded circle indicates the position of the ambulance 101. It is the component of the speed v in the direction of the transmitted noise suppression device 200a that contributes to the Doppler effect. Hereinafter, the component of the speed v of the ambulance 101 in the direction of the transmitted noise suppression device 200a will be simply referred to as the speed component vc.

[0056] The speed calculation unit 260 of this embodiment compares the position information 105 with the map information stored in the storage unit 300, and calculates the speed component vc of the calculated speed v. For example, as shown in the dashed line balloon in Fig. 6(b), when the angle formed between the traveling direction of the ambulance 101 (the direction of the speed v) and the transmitted noise suppression device 200a is θ, the component vc of the speed v is v cos θ.

[0057] The speed calculation unit 260 identifies the road on which the ambulance 101 is traveling and ascertains the direction of travel based on, for example, the received location information 105 and map information. Also, it calculates the angle θ between the direction of travel and the transmission noise suppression device 200a based on the received location information 105 and pre-stored location information of the building 103 in which the transmission noise suppression device 200a is installed.

[0058] The above-described position information acquisition process by the communication unit 220 and the above-described speed information calculation process by the speed calculation unit 260 may be performed independently of the processes of other functional units. For example, these processes may be performed at transmission time intervals, and the processes of other functional units may be performed at sound collection time intervals.

[0059] The correction unit 230 of this embodiment uses the velocity component vc calculated by the velocity calculation unit 260 to calculate the frequency of the siren sound 102 that has changed due to the Doppler effect as the corrected frequency. In this embodiment, the velocity component vc is obtained by referring to the position and velocity database 310. For example, the correction unit 230 may refer to the position and velocity database 310 to obtain the latest velocity component vc and use it in the calculation.

[0060] If the fundamental frequency of the siren sound 102 when it is output from the ambulance 101 is f0 (Hz) and the speed of sound is V (m / sec), the corrected frequency f is calculated as f=f0*V / (V-vc).

[0061] The fundamental frequency is stored in advance in the storage unit 300. There are currently four types of siren sounds 102 for the ambulance 101: normal (daytime), normal (nighttime), manual (high-pitched), and manual (low-pitched). For example, the sound collection unit 210 may determine which type of siren sound 102 the collected siren sound 102 is, and notify the correction unit 230. Whether the siren sound 102 is normal (daytime) or normal (nighttime) may be determined from the current time. This information is also stored in the storage unit 300 in advance.

[0062] The intensity calculation unit 270 calculates the arrival intensity, which is the intensity of the siren sound 102 when it reaches the transmission sound suppression device 200a. In this embodiment, the intensity calculation unit 270 may, for example, use the position information 105 stored in the position and velocity database 310 to calculate the distance L between the transmission sound suppression device 200a and the ambulance 101 for each transmission time interval ΔT1, and calculate the amount of attenuation from the original intensity stored in the storage unit 300 as the specifications of the siren sound 102. An existing calculation formula may be used to calculate the amount of attenuation. The intensity calculation unit 270 calculates the arrival intensity by subtracting the amount of attenuation from the intensity of the original siren sound 102. At this time, transmission loss due to the walls of the building 103, etc., may be taken into account. The transmission loss is stored in advance in the storage unit 300.

[0063] The intensity calculation unit 270 may actually measure the intensity of the siren sound 102 extracted from the external sound actually received by the sound collection unit 210, and obtain the reaching intensity.

[0064] The signal generating unit 240 generates a cancellation signal 108 that is in the opposite phase of the corrected frequency and has approximately the same intensity as the arrival intensity. At this time, a predetermined delay time within the device is taken into consideration when generating the cancellation signal 108. Note that the output intensity, which is the intensity of the cancellation signal 108 to be output, may be smaller than the arrival intensity. In this case, the output intensity may be calculated, for example, by multiplying the arrival intensity by a predetermined coefficient.

[0065] The output unit 250 outputs the cancellation signal 108 generated by the signal generating unit 240 .

[0066] [Location information transmission device] The ambulance 101 of this embodiment includes a location information transmission device 400. The location information transmission device 400 includes a location information acquisition unit 410 and a location information transmission unit 420, as shown in FIG.

[0067] The location information acquisition unit 410 acquires location information 105 of the vehicle at predetermined time intervals. For example, it may acquire radio waves from a positioning satellite such as a GPS (Global Positioning System) and calculate the location of the vehicle from the radio waves. It may also be equipped with an FM multiplex broadcasting receiver and further take into account information from VICS (Vehicle Information and Communication System; registered trademark).

[0068] The location information transmitting unit 420 transmits the location information 105 acquired by the location information acquiring unit 410 at the aforementioned transmission time interval ΔT1.

[0069] The location information transmission device 400 may be realized by, for example, a mobile terminal mounted on the ambulance 101 and having a location information acquisition function and a data communication function.

[0070] [Transmitted sound suppression processing] The flow of the transmitted sound suppression process of this embodiment will be described. Fig. 7 shows the processing flow of the transmitted sound suppression process of this embodiment. Here, the flow of the process that starts when the transmitted sound suppression device 200a is started, for example, will be described.

[0071] First, sound collection unit 210 determines whether siren sound 102 has been detected (step S2101). Here, it determines whether siren sound 102 is included in the collected external sounds at sound collection time intervals. Specifically, as described above, it determines whether, for example, sound waves having an intensity equal to or greater than a predetermined threshold are included. Sound collection unit 210 repeats this process at predetermined sound collection time intervals.

[0072] If it is determined that the siren sound 102 has been detected, the sound collection unit 210 extracts the siren sound 102 in the same manner as in the first embodiment (step S2102).

[0073] Thereafter, the correction unit 230 accesses the position and velocity database 310 and obtains the velocity component vc of the ambulance 101 by the above-mentioned method (step S2103).

[0074] Then, the correction unit 230 corrects the frequency of the siren sound 102 using the obtained velocity component vc (step S2104) to obtain a corrected frequency.

[0075] Furthermore, the intensity calculation unit 270 calculates the reaching intensity using the above method (step S2105). Note that this process may be performed at any timing after step S2102 and before step S2106.

[0076] The signal generating unit 240 generates the cancellation signal 108 having output intensity at the corrected frequency (step S2106). At this time, the phase is shifted and delayed by a predetermined in-device delay time. The output intensity is determined based on the reaching intensity.

[0077] The output unit 250 outputs the generated cancellation signal 108 (step S2107).

[0078] Thereafter, the transmission noise suppression device 200a determines whether a stop instruction has been received (step S2108), and if not, returns to step S2101 and repeats the process. On the other hand, if a stop instruction has been received, the process ends as is. The stop instruction is, for example, an instruction to turn off the transmission noise suppression device 200a.

[0079] As described above, the transmission noise suppression device 200a of this embodiment has the same configuration as that of the first embodiment, and therefore provides the same effects as those of the first embodiment.

[0080] Furthermore, according to this embodiment, the speed component vc of the ambulance 101 is calculated from the position information 105 of the ambulance 101 acquired at the transmission time interval, and the corrected frequency of the siren sound 102 is calculated based on this. Therefore, the phase of the arriving siren sound 102 can be identified with high accuracy, more in line with the actual environment. As a result, the cancellation signal 108 with a higher suppression effect can be generated.

[0081] In this way, the transmitted noise suppression device 200a of this embodiment can provide a quiet environment to the user 109 who is indoors.

[0082] <Variation 1> In the above embodiment, the corrected frequency is calculated using the already calculated speed component vc, but this is not limiting. The ambulance 101 continues to transmit location information 105 at a predetermined transmission time interval. For example, as shown in FIG. 6(b), it is possible to predict a location p6 at a future time t6 by extrapolation or other methods using a siren sound 102 output from a past location p4 and a siren sound 102 output from a current location p5. At this time, information from the VICS or the like may also be taken into consideration.

[0083] The speed calculation unit 260 also predicts the speed v6 of the ambulance 101 at a position p6 at a future time t6 from the speed of the ambulance 101 at a past position p4 and the speed of the ambulance 101 at a current position p5.

[0084] The correction unit 230 may calculate the corrected frequency using a position p6 and a velocity v6 at a future time t6.

[0085] <Variation 2> The transmission noise suppression device 200 or 200a may be provided with a silent mode that enables the suppression function. Hereinafter, when there is no need to particularly distinguish between the transmission noise suppression device 200 and 200a, they will be represented by the transmission noise suppression device 200. The transmission noise suppression device 200b of this modified example further comprises an operation receiving unit 280 in addition to the components of the transmission noise suppression device 200 of the above embodiment.

[0086] FIG. 8(a) shows an example of a functional block of a transmission noise suppression device 200b in the case where the transmission noise suppression device 200a is provided with an operation receiving unit 280.

[0087] The operation receiving unit 280 receives, for example, an operation instruction to operate the transmission sound suppression device 200b in silent mode from the user 109. For this reason, for example, if the transmission sound suppression device 200b is equipped with a display 198 having a touch panel function, the operation receiving unit 280 displays, as receiving means, a screen on the display 198 that has a button 350 for receiving an operation instruction to operate in silent mode, as shown in FIG. 8(b). Note that the transmission sound suppression device 200b may also be equipped with a mechanical reception button as receiving means. Note that data for generating this screen is stored in advance in the storage unit 300.

[0088] When the operation receiving unit 280 receives an operation instruction to operate in silent mode via the receiving means, it enables the suppression function. The suppression function is a function that outputs the cancellation signal 108 that cancels the siren sound 102, as described in the above embodiments. Therefore, the operation receiving unit 280 enables and operates the sound collection unit 210, the communication unit 220, the correction unit 230, the signal generation unit 240, the output unit 250, the speed calculation unit 260, and the intensity calculation unit 270.

[0089] Here, in the initial state at the time of startup, the silent mode of the transmission noise suppression device 200b is set to inactive, that is, the suppression function is disabled at the time of startup.

[0090] For example, conventionally, soundproof walls, soundproof curtains, etc. are installed in the building 103 to reduce the siren sound 102. However, in this case, the suppression function also works on users 109 who need the siren sound 102. However, with the transmission sound suppression device 200b of this modified example, only users 109 who do not need the siren sound 102 from the ambulance 101 can selectively enjoy the suppression function.

[0091] <Variation 3> Furthermore, the cancellation signal 108 may be configured to be adjustable. For example, the transmission noise suppression device 200 of each of the above embodiments may have a function for making fine adjustments when the user 109 determines that the siren sound 102 is not sufficiently suppressed by the autonomous control of the transmission noise suppression device 200 alone. The transmission noise suppression device of this modification accepts, for example, an instruction to adjust the strength of the cancellation signal 108.

[0092] 9(a) shows an example of a transmission noise suppression device 200c of this modified example. As shown in this figure, the transmission noise suppression device 200c further includes an adjustment receiving unit 290.

[0093] The adjustment receiving unit 290 receives an instruction from the user 109 to adjust the strength (amplitude) of the cancellation signal 108.

[0094] 9(b), the adjustment receiving unit 290 displays on the display 198 a screen including a strong button 361 for receiving an instruction to increase the strength of the cancellation signal 108 and a weak button 362 for receiving an instruction to decrease the strength of the cancellation signal 108. Each time the adjustment receiving unit 290 receives a press, the adjustment receiving unit 290 increases or decreases the strength of the cancellation signal 108 by a predetermined amount. Data for generating this screen is stored in the storage unit 300 in advance.

[0095] The adjustment receiving unit 290 notifies the received intensity adjustment instruction to the signal generating unit 240. Upon receiving the instruction, the signal generating unit 240 adjusts the intensity of the generated cancellation signal 108 in accordance with the adjustment instruction.

[0096] For example, the adjustment receiving unit 290 may further generate a screen or the like for receiving information identifying the user 109 and receive the information about the user 109. In this case, the adjustment level 365 may be associated with a user identifier 364, which is information identifying the user 109, and registered in the storage unit 300 as an adjustment database 363. An example of the generated adjustment database 363 is shown in FIG. 9(c). The user identifier may be, for example, the name of the user 109. The adjustment level may be, for example, the number of times the strong button 361 or the weak button 362 is pressed.

[0097] Thereafter, for example, at startup or when silent mode is instructed, adjustment receiving unit 290 also receives input of a user identifier. Then, adjustment receiving unit 290 refers to this adjustment database 363, and if the input user identifier is registered, adjustment receiving unit 290 may adjust the strength of cancellation signal 108 according to the corresponding registered adjustment degree.

[0098] As a result, the user 109 can obtain a quieter environment without any trouble, since the siren sound 102 is automatically suppressed by the cancellation signal 108 adjusted to the optimum intensity without having to give an adjustment instruction every time.

[0099] <Variation 4> The transmission noise suppression device 200 may further include a learning unit. The learning unit performs machine learning using training data to generate a trained model. This trained model may then be used for the various detections and discriminations described above.

[0100] For example, the learning unit generates in advance a trained model that is trained using as training data external sounds including siren sound 102 among external sounds collected by sound collection unit 210. In this case, sound collection unit 210 may use this trained model to determine whether or not an external sound includes siren sound 102 each time it collects it.

[0101] The learning unit also prepares data in advance that associates location information 105, collected siren sound 102, and actually measured frequency information, and generates a trained model in advance by training the data as training data. In this case, correction unit 230 may use the trained model to directly obtain the corrected frequency from received location information 105.

[0102] The same applies to the intensity of the collected siren sound 102. For example, the learning unit may prepare data in advance that associates the position information 105 with the actually measured intensity of the siren sound 102, and generate a trained model that is trained using this data as training data. In this case, the signal generation unit 240 may use this trained model to determine the intensity of the cancellation signal 108 from the position information 105.

[0103] For example, in the above embodiment, the corrected frequency is obtained using the already calculated velocity component vc. However, after the siren sound 102 is output from the ambulance 101, a delay occurs before it reaches the transmitted noise suppression device 200, which delay is determined by the distance between the two, the speed of sound, other environmental factors, and the like. Therefore, for example, the siren sound 102 collected at the timing when the position information 105 is acquired is output from the ambulance 101 at a position different from the position specified by the position information 105. As a result, the angle θ between the velocity direction used to calculate the velocity component vc and the transmitted noise suppression device 200 differs. However, by using a trained model in this way, such discrepancies can be reduced, and further, the accuracy of the phase of the cancellation signal 108 can be improved.

[0104] The learning unit may be provided in a device external to the transmission sound suppression device 200. In this case, the transmission sound suppression device 200 may be configured to receive only the generated trained model or the results obtained by the trained model.

[0105] <Variation 5> In the above embodiment, the transmitted sound to be suppressed is the siren sound 102 of the ambulance 101, but the transmitted sound to be suppressed is not limited to this. Any sound having a specific frequency band may be suppressed. For example, the transmitted sound may be engine sounds of aircraft or helicopters, rotor noise of helicopters, or the like, which are common noise pollution sources.

[0106] Conversely, transmitted sounds that are not to be suppressed may be determined in advance. For example, sirens from police cars and fire engines, neighborhood alarms, etc., are not suppressed even if they are output in a specific frequency band. The frequencies of such transmitted sounds that are not to be suppressed, including their displacement width due to the Doppler effect, are stored in advance in the storage unit 300 as transmitted sounds that are not to be suppressed.

[0107] In this case, for example, after extracting the transmitted sound, the sound collection unit 210 identifies the frequency thereof and refers to the storage unit 300 to determine whether or not the frequency is registered as a non-suppression target.

[0108] [Hardware configuration] The transmitted noise suppression device 200 and the location information transmission device 400 of each of the above embodiments may be realized, for example, by a general-purpose information processing device. The general-purpose information processing device includes, for example, a CPU (Central Processing Unit) 191, a main storage device (memory) 192, an auxiliary storage device 193, a communication I / F 194, an expansion I / F 195, a microphone 196, a speaker 197, and a display 198, which are interconnected by an internal bus, as shown in Fig. 10. The location information transmission device 400 does not necessarily include the microphone 196, the speaker 197, and the display 198.

[0109] The CPU 191 realizes the above functions and controls the entire device by, for example, loading a program stored in the auxiliary storage device 193 into the main storage device 192 and executing it. Note that the CPU 191 may be replaced by one or more processors such as an MPU (Micro Processing Unit).

[0110] The main storage device 192 is a memory such as a RAM (Random Access Memory), etc. The main storage device 192 is a work area when the CPU 191 processes programs executed by the installed devices.

[0111] The auxiliary storage device 193 is, for example, a read-only memory (ROM), a hard disk drive (HDD), or a solid state drive (SSD). The auxiliary storage device 193 stores various programs executed by the installed device. In each of the above embodiments and / or modifications, the storage unit 300 may be constructed on the auxiliary storage device 193. The auxiliary storage device 193 may include a storage medium such as a flexible disk, a hard disk, an optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, or a DVD.

[0112] The programs stored in the auxiliary storage device 193 can be provided as program products recorded on a non-transitory computer-readable recording medium. The auxiliary storage device 193 can be used to store various programs recorded on a non-transitory computer-readable recording medium for the medium to long term.

[0113] The communication I / F 194 is an interface for inputting and outputting signals and data via wired or wireless communication. For example, in each of the above embodiments and / or modifications, the location information transmission unit 420 transmits the location information 105 via the communication I / F 194. The communication unit 220 receives the location information 105 via the communication I / F 194. The communication I / F 194 may also include an antenna, a modem, etc.

[0114] The expansion I / F 195 is an interface for connecting an input device, etc. The input device is, for example, a device that accepts user operations such as a keyboard or a mouse. For example, it is used to accept silent mode, adjustments, etc.

[0115] The microphone 196 collects sound data around the transmission sound suppression device 200. In the above-described embodiments, the sound collection unit 210 collects external sounds via the microphone 196.

[0116] The speaker 197 outputs a signal such as audio data from the transmitted noise suppression device 200. In the above-described embodiments, the output unit 250 outputs the cancellation signal 108 from the speaker 197.

[0117] The display 198 is a display device, such as a liquid crystal monitor. The liquid crystal monitor may have a touch panel function that accepts instructions by touch operation by the user 109.

[0118] At least one of the microphone 196 and the display 198 may be provided independently of the transmitted sound suppression device 200. In this case, they may be connected via the expansion I / F 195, for example.

[0119] The above-mentioned functions of each device are realized by the CPU 191 loading a program stored in the auxiliary storage device 193 into the main storage device 192 and executing it.

[0120] The hardware configuration of each device is not limited to this. Each function (server) of each device may be implemented using, for example, an integrated circuit (IC) dedicated to each process, an application specific integrated circuit (ASIC), a system on a chip (SOC), a field programmable gate array (FPGA), or the like.

[0121] In addition, a program for realizing each of the above functions of each device can be recorded on a computer-readable storage medium. The storage medium can be a non-transitory medium such as a semiconductor memory, a hard disk, a magnetic recording medium, or an optical recording medium. The present disclosure can also be embodied as a computer program product.

[0122] The transmitted noise suppression device 200 of each of the above-described embodiments is attached to, for example, the wall of the building 103. The microphone 196 is preferably installed outdoors, while the speaker 197 is preferably installed indoors.

[0123] <Variation 6> For example, the above-mentioned speaker 197 and display 198 may be configured as devices (output devices) independent of the transmission sound suppression device 200. In this case, for example, the output device may be configured to include a communication I / F and to receive and output the cancellation signal 108 from the transmission sound suppression device 200 via the communication I / F.

[0124] This allows the user 109 to enjoy the suppression effect of the cancellation signal 108 in a more familiar manner.

[0125] Furthermore, a plurality of output devices may be provided. In this case, for example, an output device may be arranged for each divided space (e.g., room) indoors. In this case, the intensity adjustment of the cancellation signal 108 may be set for each output device. In this case, in addition to the user identifier and adjustment degree, information for identifying the output device may be registered in association with the user identifier and adjustment degree in the adjustment database 363.

[0126] Speaker 197 may also be a vibration transmission speaker that is attached to a wall and is made up of a piezoelectric diaphragm or the like that vibrates the wall itself.

[0127] <Variation 7> Furthermore, in each of the above embodiments and modifications, some of the functions may be provided in other devices. For example, the operation receiving unit 280 and / or the adjustment receiving unit 290 may be realized by, for example, a terminal having a data communication function. In this case, the terminal transmits, as signals, operation instructions received via the operation receiving unit 280 and / or adjustment instructions received via the adjustment receiving unit 290 to the transmission noise suppression device 200. The transmission noise suppression device 200 then receives these instructions via the communication unit 220.

[0128] In this case, the transmitted noise suppression device 200 may be provided with a communication interface that can transmit and receive signals directly to and from the terminal, not just via the communication base station or the like 106, but also via Bluetooth (registered trademark) or infrared communication or the like.

[0129] In the process flow used in the above explanation, multiple steps (processes) are described in order, but the order in which each step is performed is not limited to the order described. For example, the order of the steps shown in the figure can be changed to the extent that the content is not affected, such as performing each process in parallel.

[0130] Although the embodiments and modifications of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be modified in various ways that would be understandable to a person skilled in the art. Each embodiment and modification can be combined with other embodiments as appropriate. Furthermore, for example, the network configurations and element configurations shown in the drawings are examples intended to aid in understanding the present disclosure and are not limited to the configurations shown in these drawings.

[0131] Finally, preferred embodiments of the present disclosure will be summarized. Some or all of the above-described embodiments can be described as, but are not limited to, the following supplementary notes. (Appendix 1) The transmitted noise suppression device is a sound collection unit that collects external sounds including transmitted sounds of a specific frequency band output from a moving object; a communication unit that acquires location information of the mobile object at predetermined transmission time intervals; a correction unit that corrects the specific frequency band of the transmitted sound using the position information and calculates a corrected frequency; a signal generating unit that generates a cancellation signal having an opposite phase to the corrected frequency; and an output unit that outputs the generated cancellation signal. (Appendix 2) In the transmitted noise suppression device according to Supplementary Note 1, a speed calculation unit that calculates a speed of the moving object using the position information acquired during each of the transmission time intervals of the moving object; the sound collection unit collects the transmitted sound at a predetermined sound collection time interval, the correction unit calculates the corrected frequency using information about the speed each time the transmission sound is collected, It is desirable that the signal generating section generates the cancellation signal using the corrected frequency every time the corrected frequency is calculated. (Appendix 3) In the transmitted noise suppression device according to Supplementary Note 2, It also includes map information, the speed calculation unit calculates a component of the speed of the moving object in a direction toward the transmission noise suppression device based on the map information; It is desirable that the correction unit uses a component in the direction of the transmitted noise suppression device as the information on the speed. (Appendix 4) In the transmitted noise suppression device according to any one of Supplementary Note 1 to 3, further comprising an operation receiving unit that receives an operation instruction to operate in silent mode; When the operation instruction is received, the operation receiving unit preferably operates the correction unit, the signal generation unit, and the output unit. (Appendix 5) In the transmitted noise suppression device according to any one of Supplementary Note 1 to 4, further comprising an adjustment receiving unit that receives an instruction to adjust the intensity of the cancellation signal; It is desirable that the signal generation section adjusts the intensity of the cancellation signal in accordance with the adjustment instruction. (Appendix 6) In the transmitted noise suppression device according to any one of Supplementary Note 1 to 5, It is desirable that the correction unit estimates the corrected frequency using a trained model that has been generated in advance. (Appendix 7) In the transmitted noise suppression device according to any one of Supplementary Notes 1 to 6, The transmitted noise suppression device is attached to a wall of a building, The sound collection unit is disposed outdoors, It is desirable that the output unit be placed indoors and output the cancellation signal toward the indoors. (Appendix 8) The transmitted noise suppression system a transmission noise suppression device according to appendix 1; The vehicle also includes a location information transmission device that is mounted on the vehicle and transmits the location information at predetermined time intervals. (Appendix 9) The transmission suppression method is as follows: Collects external sounds including transmitted sounds of specific frequency bands generated by moving objects, correcting the specific frequency band of the transmitted sound using position information of the moving body acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; The cancellation signal is output. (Appendix 10) The program is A procedure for collecting external sounds including transmitted sounds of a specific frequency band generated by a moving object; a step of correcting the specific frequency band of the transmitted sound by using position information of the moving object acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; and a procedure for outputting the cancellation signal. (Appendix 11) In the transmitted noise suppression device according to any one of Supplementary Notes 1 to 7, a plurality of the output units; It is desirable that the plurality of output units are arranged in different rooms of the building. (Appendix 12) In the transmitted noise suppression device according to any one of Supplementary Notes 1 to 7 and 11, An intensity calculation unit that calculates the intensity of the collected transmitted sound is further provided, It is desirable that the signal generating section sets the intensity of the cancellation signal to be substantially the same as the intensity of the transmitted sound. (Appendix 13) In the transmitted noise suppression device according to any one of Supplementary Notes 1 to 7, 11 and 12, It is desirable that the signal generating section takes into consideration a pre-calculated internal delay time when generating the cancellation signal. In addition, the forms of Supplements 8-10 can be expanded into the forms of Supplements 2-7 and 11-13, just like Supplement 1.

[0132] The disclosures of the above-mentioned patent documents, etc. are incorporated herein by reference. Within the scope of this disclosure (including the claims), modifications and adjustments of the embodiments and variations are possible based on the basic technical concept. Furthermore, within the scope of this disclosure, various combinations and selections of the various disclosed elements (including each element of each claim, each element of each embodiment or variation, each element of each drawing, etc.) are possible. In other words, this disclosure naturally includes various modifications and alterations that would be possible by a person skilled in the art in accordance with the entire scope, including the claims, and the technical concept. In particular, with regard to the numerical ranges described herein, any numerical value or subrange included within that range should be construed as specifically described, even if not otherwise specified. [Explanation of symbols]

[0133] 100: Transmission sound suppression system, 101: Ambulance, 102: Siren sound, 103: Building, 105: Location information, 106: Communication base station etc., 108: Cancellation signal, 109: User, 191: CPU, 192: Main memory device, 193: Auxiliary memory device, 194: Communication I / F, 195: Expansion I / F, 196: Microphone, 197: Speaker, 198: Display, 200: Transmission sound suppression device, 200a: Transmission sound suppression device, 200b: Transmission sound suppression device, 200c: Transmission sound suppression device, 210: Sound collection unit, 220: Communication unit, 230: Correction unit, 240: Signal generation unit, 250: Output unit, 260: Speed ​​calculation unit, 270: Intensity calculation unit, 280: Operation reception unit, 290: Adjustment reception unit, 300: Memory unit, 310: Position and speed database, 311: Reception time storage field, 312: Position information storage field, 313: Speed ​​storage field, 314: Speed ​​component storage field, 350: Button, 361: Strong button, 362: Weak button, 363: Adjustment database, 364: User identifier, 365: Adjustment level, 400: location information transmission device, 410: location information acquisition unit, 420: location information transmission unit, 501: sound wave, 502: cancellation signal, 503: composite wave, 504: sound wave, 505: cancellation signal, 506: composite wave, 510: waveform shape, 511: waveform shape, 512: waveform shape

Claims

1. a sound collection unit that collects external sounds including transmitted sounds of a specific frequency band output from a moving object; a communication unit that acquires location information of the mobile object at predetermined transmission time intervals; a correction unit that corrects the specific frequency band of the transmitted sound using the position information and calculates a corrected frequency; a signal generating unit that generates a cancellation signal having an opposite phase to the corrected frequency; an output unit that outputs the generated cancellation signal.

2. The transmission noise suppression device according to claim 1, a speed calculation unit that calculates a speed of the moving object using the position information acquired during each of the transmission time intervals of the moving object; the sound collection unit collects the transmitted sound at a predetermined sound collection time interval, the correction unit calculates the corrected frequency using information about the speed each time the transmission sound is collected, The signal generation unit generates the cancellation signal using the corrected frequency every time the corrected frequency is calculated.

3. The transmission noise suppression device according to claim 2, It also includes map information, the speed calculation unit calculates a component of the speed of the moving object in a direction toward the transmission noise suppression device based on the map information; The transmission noise suppression device, wherein the correction unit uses a component in the transmission noise suppression device direction as the information on the speed.

4. The transmission noise suppression device according to any one of claims 1 to 3, further comprising an operation receiving unit that receives an operation instruction to operate in silent mode; When the operation instruction is received, the operation receiving unit operates the correction unit, the signal generation unit, and the output unit.

5. The transmission noise suppression device according to any one of claims 1 to 3, further comprising an adjustment receiving unit that receives an instruction to adjust the intensity of the cancellation signal; The signal generation unit adjusts the intensity of the cancellation signal in accordance with the adjustment instruction.

6. The transmission noise suppression device according to any one of claims 1 to 3, The correction unit estimates the corrected frequency using a trained model generated in advance.

7. The transmission noise suppression device according to any one of claims 1 to 3, The transmitted noise suppression device is attached to a wall of a building, The sound collection unit is disposed outdoors, The output unit is disposed indoors and outputs the cancellation signal toward the indoors.

8. The noise transmission suppression device according to claim 1; A transmission noise suppression system comprising: a location information transmission device mounted on the moving body and transmitting the location information at predetermined time intervals.

9. The computer Collects external sounds including transmitted sounds of specific frequency bands generated by moving objects, correcting the specific frequency band of the transmitted sound using position information of the moving body acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; A transmission noise suppression method that outputs the cancellation signal.

10. On the computer, A step of collecting external sounds including transmitted sounds of a specific frequency band generated by a moving object; a step of correcting the specific frequency band of the transmitted sound by using position information of the moving object acquired at a predetermined transmission time interval to calculate a corrected frequency; generating a cancellation signal having an opposite phase to the corrected frequency; a program for executing the procedure of outputting the cancellation signal;

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