Wiring method and silencer

Abstract

To secure reliability further in RNC (road noise cancellation) for removing road noise in a passenger compartment space.SOLUTION: In a wiring method according to an embodiment, a muffler which executes driving noise removal processing of a vehicle is connected to one end of a cable and multiple sensors used in the driving noise removal processing are connected to the cable. Each of the sensors whose priorities are set so as to be higher as its noise suppressing performance of the driving noise removal processing gets higher is connected at a position on the cable, which gets closer to the muffler as the priority is higher.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The disclosed embodiments relate to a wiring method and a sound silencing device. [Background technology]

[0002] BACKGROUND ART Conventionally, a noise reduction technology called RNC (Road Noise Cancellation) is known for eliminating road noise, which is noise generated in the vehicle interior space due to vibrations while the vehicle is running (see, for example, Patent Document 1).

[0003] In RNC, different noise reduction performance may be required in different parts of a vehicle space. For example, the frequency band to be reduced in the rear seats may be wider than that in the front seats.

[0004] In this case, the RNC installs a shoulder speaker and microphone near the headrest of the rear seat, for example, and uses this microphone to monitor the silencing condition near the shoulder speaker, while outputting an audio signal from the shoulder speaker that is in the opposite phase to the mid-range noise.

[0005] In this way, by using shoulder speakers and corresponding microphones in addition to door speakers, it is possible to ensure different noise reduction performances in different parts of a vehicle space. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 2014-534686 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the prior art still has room for improvement in order to ensure greater reliability in the RNC.

[0008] In RNC, sensors such as the aforementioned microphones are typically connected in a daisy chain using A2B (registered trademark), but with this connection method, the sensors at the end of the daisy chain are more likely to experience problems such as broken wires and signal attenuation.

[0009] Therefore, depending on the order in which the sensors are connected, it may be difficult to achieve the required noise reduction performance, for example, in the case of the rear seat mentioned above, where the microphone experiences trouble and mid-range noise cannot be sufficiently reduced.

[0010] One aspect of the embodiment has been made in consideration of the above, and aims to provide a wiring method and a silencer that can further ensure the reliability of RNC (Road Noise Cancellation) for removing road noise in the vehicle interior space. [Means for solving the problem]

[0011] A wiring method according to one aspect of the embodiment is a wiring method in which a noise reduction device that performs a process of eliminating vehicle running noise is connected to one end of a cable, and a plurality of sensors used in the running noise reduction process are connected to the cable, and includes connecting the sensors that are set to have higher priorities in order of higher noise reduction performance for the running noise reduction process from a position on the cable that is closest to the noise reduction device. [Effects of the Invention]

[0012] According to one aspect of the embodiment, it is possible to further ensure the reliability of RNC (Road Noise Cancellation) for removing road noise in a vehicle interior space. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a schematic side view showing an example of the configuration of an RNC system according to an embodiment. [Figure 2] FIG. 2 is a schematic plan view showing an example of the configuration of an RNC system according to the embodiment. [Figure 3] FIG. 3 is an explanatory diagram (part 1) of a wiring method according to the existing technology. [Figure 4] FIG. 4 is an explanatory diagram (part 2) of a wiring method according to the existing technology. [Figure 5] FIG. 5 is an explanatory diagram (part 1) of a wiring method according to an embodiment. [Figure 6] FIG. 6 is an explanatory diagram (part 2) of the wiring method according to the embodiment. [Figure 7] FIG. 7 is a block diagram illustrating an example of the configuration of an RNC device according to the embodiment. [Figure 8] FIG. 8 is a flowchart showing the processing procedure of the wiring method according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the wiring method and silencer disclosed in the present application will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0015] In the following, the noise reduction device according to the embodiment is assumed to be an RNC device 10 mounted on a vehicle V. In the following, an example will be given in which two areas having different noise reduction performances are provided in the cabin space of the vehicle V.

[0016] One of these two regions is the region on the front seat side, where the frequency band to be silenced is narrower than that of the rear seat side. Hereinafter, this region will be referred to as the "narrow band region."

[0017] The other of these two regions is the rear seat region, where the frequency band to be silenced is wider than that of the front seat region. Hereinafter, this region will be referred to as the "broadband region."

[0018] Fig. 1 is a schematic side view showing an example of the configuration of an RNC system 1 according to an embodiment. Fig. 2 is a schematic plan view showing an example of the configuration of an RNC system 1 according to an embodiment. The RNC system 1 is an in-vehicle system that is mounted on a vehicle V and uses an RNC to muffle road noise in the vehicle interior space.

[0019] 1, the RNC system 1 includes an RNC device 10, a plurality of sensors 101, a plurality of sensors 102, and a plurality of speakers 103. The sensor 101 is an acceleration sensor, and the sensor 102 is a microphone.

[0020] The sensors 101 are installed near the suspensions of each tire to detect vibrations between the tires and the suspensions. The RNC device 10 generates an audio signal (hereinafter referred to as an "anti-phase signal" as appropriate) that is the same magnitude as, but in opposite phase to, the noise caused by the vibrations, and outputs the generated anti-phase signal to the speaker 103 to perform a running noise removal process (hereinafter referred to as an "RNC process" as appropriate) that cancels out the noise.

[0021] The sensors 102 are installed near the shoulder speakers of the speakers 103 installed near the headrests of the rear seats and near the assist grips corresponding to each seat, and collect sounds within the vehicle cabin. The RNC device 10 monitors the silencing state within the vehicle cabin based on the sounds collected by the sensors 102 so that the aforementioned antiphase signals are generated appropriately.

[0022] A more specific description will be given of an example of the arrangement of the sensor 101, the sensor 102, and the speaker 103. First, an example of the arrangement of the speaker 103 will be described. As shown in Fig. 2, the RNC system 1 has speakers 103-1 to 103-9 as the speaker 103.

[0023] Speaker 103-1 is a door speaker provided in the door of the right front seat (hereinafter referred to as the "FR seat" where appropriate). Speaker 103-2 is a door speaker provided in the door of the left front seat (hereinafter referred to as the "FL seat" where appropriate). Speaker 103-3 is a door speaker provided in the door of the right rear seat (hereinafter referred to as the "RR seat" where appropriate). Speaker 103-4 is a door speaker provided in the door of the left rear seat (hereinafter referred to as the "RL seat" where appropriate).

[0024] Speaker 103-5 is a right (R) side shoulder speaker provided near the headrest of the RR seat. Speaker 103-6 is a left (L) side shoulder speaker provided near the headrest of the RR seat. Speaker 103-7 is an R side shoulder speaker provided near the headrest of the RL seat. Speaker 103-8 is an L side shoulder speaker provided near the headrest of the RL seat. Speaker 103-9 is a subwoofer speaker provided behind the rear seat.

[0025] Next, a description will be given of an example of the arrangement of the sensors 101 and 102. The RNC system 1 includes, as the sensors 101, sensors 101-1 to 101-4.

[0026] Sensor 101-1 is provided near the suspension of the left rear wheel. Sensor 101-2 is provided near the suspension of the right rear wheel. Sensor 101-3 is provided near the suspension of the right front wheel. Sensor 101-4 is provided near the suspension of the left front wheel.

[0027] Furthermore, the RNC system 1 includes sensors 102-1 to 102-8 as sensors 102. Sensor 102-1 is provided near speaker 103-5. Sensor 102-2 is provided near speaker 103-6. Sensor 102-3 is provided near speaker 103-7. Sensor 102-4 is provided near speaker 103-8.

[0028] Sensor 102-5 is provided near the assist grip of the RL seat. Sensor 102-6 is provided near the assist grip of the RR seat. Sensor 102-7 is provided near the assist grip of the FR seat. Sensor 102-8 is provided near the assist grip of the FL seat.

[0029] The sensors 101-1 to 101-4 are daisy-chained by A2B to form a first system of connection lines of acceleration sensors extending from the RNC device 10. The sensors 102-1 to 102-8 are also daisy-chained by A2B to form a second system of connection lines of microphones extending from the RNC device 10.

[0030] For ease of understanding, the wiring method for the connection lines of the sensors 101-1 to 101-4 and the connection lines of the sensors 102-1 to 102-8 will be described first with reference to the existing technology before describing the wiring method according to the embodiment.

[0031] 3 and 4 are explanatory diagrams (part 1) and (part 2) of wiring methods according to existing technology. As mentioned above, with a daisy chain connection, the sensors at the end of the daisy chain are more likely to encounter problems such as broken wires and signal attenuation.

[0032] Therefore, depending on the order in which the sensors are connected, it may be difficult to ensure the noise reduction performance required for the RNC, but the wiring method according to the existing technology does not take into consideration the order in which the sensors are connected.

[0033] As shown in Figure 3, the RNC's required specifications are set so that a "wideband area" is set for the rear seat side and a "narrowband area" is set for the front seat side. The "wideband area" is more important than the "narrowband area" because the frequency band to be silenced is wider.

[0034] In this case, in the wiring method according to the existing technology, as shown in FIGS. 3 and 4, in the first system, the sensors 101 are daisy-chained from the RNC device 10 in the order of, for example, sensor 101-1, sensor 101-4, sensor 101-3, and sensor 101-2.

[0035] In other words, in the wiring method according to the existing technology, regardless of the required specifications of the RNC for each of the broadband area and narrowband area, the sensors 101 are connected in a daisy chain so as to surround the entire broadband area and narrowband area in a clockwise direction for the first system.

[0036] 3, for example, if a problem such as a broken wire or signal attenuation occurs between sensor 101-4 and sensor 101-3 (see the "x" mark in the figure), the RNC device 10 will be unable to perform RNC processing using sensors 101-3 and 101-2. Because sensor 101-3 is closely related to RNC processing for the narrowband region and sensor 101-2 is closely related to RNC processing for the wideband region, in this case the RNC device 10 will be unable to ensure noise reduction performance in either the wideband region or the narrowband region.

[0037] On the other hand, in the second system, the sensors 102 are daisy-chained from the RNC device 10 in the order of, for example, sensor 102-6, sensor 102-7, sensor 102-8, sensor 102-5, sensor 102-4, sensor 102-3, sensor 102-2, and sensor 102-1.

[0038] That is, in the wiring method according to the existing technology, the sensors 102 are connected in a daisy chain so as to surround the wideband area counterclockwise for the second system, regardless of the required specifications of the RNC for the wideband area and the narrowband area.

[0039] 3, for example, if a problem such as a broken wire occurs between sensor 102-3 and sensor 102-2 (see the "x" mark in the figure), the RNC device 10 will be unable to perform RNC processing using sensors 102-2 and 102-1. Since sensors 102-2 and 102-1 are closely related to RNC processing in the wideband range, particularly for the rear passenger seat side, in this case the RNC device 10 will be unable to ensure noise reduction performance in at least the wideband range.

[0040] Therefore, in the wiring method according to the embodiment, the sensors 101, 102 that are set with a higher priority according to the noise reduction performance required for the RNC processing are connected so that they are higher in the order of connection to the RNC device 10. In other words, the wiring method according to the embodiment is a wiring method in which the RNC device 10 that executes the RNC processing of a vehicle is connected to one end of a cable, and multiple sensors 101, 102 used in the RNC processing are connected to the cable, and the sensors 101, 102 that are set with a higher priority according to the noise reduction performance of the RNC processing are connected from a position on the cable closest to the RNC device 10.

[0041] 5 and 6 are explanatory diagrams (part 1) and (part 2) of a wiring method according to an embodiment. As shown in Fig. 5, in the wiring method according to the embodiment, a priority (first priority) is first set for each area that is a target of RNC processing.

[0042] As described above, the broadband area is more important than the narrowband area, so in this embodiment, the first priority is "high" for the broadband area and "low" for the narrowband area, as shown in Fig. 5. Note that "high" and "low" for each priority used in the following description simply indicate the relative high or low of the priority. Therefore, such high or low may be expressed by a specific numerical value.

[0043] The sensors 101, 102 used for RNC processing in the broadband region, which has a higher first priority than the narrowband region, have a higher connection order to the RNC device 10 than the sensors 101, 102 used for RNC processing in the narrowband region. Note that, hereinafter, use for RNC processing in the broadband region may be referred to as "corresponding to the broadband region." Also, use for RNC processing in the narrowband region may be referred to as "corresponding to the narrowband region."

[0044] Next, in the wiring method according to the embodiment, a priority (second priority) is set for each of the sensors 101 and 102 corresponding to each area for which a first priority has been set. This second priority is determined by the distance between the longitudinal position of each sensor 101, 102 and the RNC device 10 when the longitudinal direction (Y-axis direction) of the vehicle V is taken as the longitudinal direction, and the closer the sensor is to the RNC device 10, the higher the second priority.

[0045] FIG. 5 shows an example in which, for example, of sensors 102-1 to 102-6 corresponding to the wideband region, sensors 102-1 to 102-4 arranged at vertical position P1, which is closer to the RNC device 10 than vertical position P2, have a higher second priority than sensors 102-5 and 102-6 arranged at vertical position P2.

[0046] The second priority of each sensor 101, 102 arranged in the same vertical position may be set arbitrarily according to predetermined priorities for each seat, but it is preferable that it be set so that the length of the cable connecting the sensors is the shortest and the cable is routed efficiently.

[0047] In the wiring method according to the embodiment in which the priority of each sensor 101, 102 is set in this manner, as shown in Figures 5 and 6, in the first system, the sensors 101 are daisy-chained from the RNC device 10 in the order of, for example, sensor 101-1, sensor 101-2, sensor 101-3, and sensor 101-4.

[0048] On the other hand, in the second system, the sensors 102 are daisy-chained from the RNC device 10 in the order of, for example, sensor 102-1, sensor 102-2, sensor 102-3, sensor 102-4, sensor 102-5, sensor 102-6, sensor 102-7, and sensor 102-8.

[0049] As a result, the sensors 101, 102 with higher priority (i.e., higher importance) are connected to the RNC device 10 in order of earliest connection. On the other hand, the sensors 101, 102 with lower priority (i.e., higher importance) are connected so that the lower the priority, the closer they are to the end of the daisy chain.

[0050] Therefore, according to the wiring method of the embodiment, even if troubles such as disconnection or signal attenuation that tend to occur on the termination side occur, the probability that the RNC processing using each of the high-priority sensors 101 and 102 can be continued is increased, thereby increasing the probability that the required noise reduction performance can be ensured.

[0051] That is, according to the wiring method of the embodiment, it is possible to further ensure the reliability of the RNC for removing road noise in the vehicle interior space.

[0052] Next, a configuration example of the RNC device 10 according to the embodiment will be described with reference to Fig. 7. Fig. 7 is a block diagram showing a configuration example of the RNC device according to the embodiment. Note that Fig. 7 shows only the components necessary to explain the features of this embodiment, and general components are omitted.

[0053] 7 are functional concepts and do not necessarily have to be physically configured as shown. For example, the specific form of distribution and integration of each block is not limited to that shown in the figure, and all or part of them can be functionally or physically distributed and integrated in any unit depending on various loads, usage conditions, etc.

[0054] In addition, in the description using FIG. 7, the description of components that have already been described may be simplified or omitted.

[0055] 7, the RNC device 10 has a communication unit 11, a storage unit 12, and a control unit 13. The RNC device 10 is also connected to the aforementioned sensor 101, which is an acceleration sensor, the aforementioned sensor 102, which is a microphone, the aforementioned speaker 103, and a display unit 104. The display unit 104 is realized by an in-vehicle display or the like.

[0056] The communication unit 11 is realized by, for example, a network adapter, etc. The communication unit 11 is connected to each system of the sensors 101, 102 that are daisy-chained using the wiring method according to the embodiment, and receives each sensor data detected by each sensor 101, 102.

[0057] The storage unit 12 is realized by, for example, a storage device such as a RAM (Random Access Memory), a ROM (Read Only Memory), or a flash memory, or a disk device such as a hard disk, etc. In the example of Fig. 7, the storage unit 12 stores processing parameter information 12a and status information 12b.

[0058] The processing parameter information 12a is information including various parameters used in the RNC processing executed by the RNC processing unit 13b, which will be described later. The status information 12b is information corresponding to the monitoring result by the monitoring unit 13c, which will be described later.

[0059] The status information 12b includes information on the status of each of the sensors 101 and 102 including the alive state monitored by the monitoring unit 13c, and the silencing state of each of the wideband and narrowband regions based on the sensor data of the sensor 102, etc.

[0060] The control unit 13 is a so-called controller. The control unit 13 is realized, for example, by a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) executing various programs (not shown) stored in the storage unit 12 using a RAM as a work area. The control unit 13 can also be realized, for example, by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0061] The control unit 13 has an acquisition unit 13a, an RNC processing unit 13b, and a monitoring unit 13c, and realizes or executes the functions and actions of information processing described below.

[0062] The acquisition unit 13a acquires sensor data from the sensors 101 and 102 via the communication unit 11. The acquisition unit 13a also outputs the acquired sensor data to the RNC processing unit 13b and the monitoring unit 13c.

[0063] The RNC processing unit 13b performs RNC processing based on each sensor data input from the acquisition unit 13a. Specifically, the RNC processing unit 13b generates an antiphase signal with the same magnitude as the noise caused by the vibration detected by the sensor 101, and outputs the generated antiphase signal to the speaker 103.

[0064] Furthermore, the RNC processing unit 13b adjusts the generation state of the antiphase signal as needed so that the antiphase signal is optimized, based on the mute state of each of the wideband region and narrowband region included in the status information 12b, which is the monitoring result of the monitoring unit 13c.

[0065] Furthermore, for sensors 101, 102 that are determined to have an abnormality such as a disconnection or signal degradation based on the status of each sensor 101, 102 included in the status information 12b, the RNC processing unit 13b logically disconnects the corresponding sensor 101, 102 to the end of the connection. Then, the RNC processing unit 13b executes RNC processing using only the sensors 101, 102 that are not disconnected.

[0066] The monitoring unit 13c monitors the status of each of the sensors 101, 102, including their vital status, based on the sensor data input from the acquisition unit 13a. The monitoring unit 13c also monitors the sound silencing state in the vehicle cabin, particularly the sound silencing state in the wideband region and the narrowband region, based on the sound collected by the sensor 102. The monitoring unit 13c also records the monitoring results in the status information 12b as needed.

[0067] Furthermore, when the monitoring unit 13c determines that there is an abnormality, such as a disconnection, in any of the sensors 101, 102 based on the sensor data, it notifies the details of the abnormality by audio output from the speaker 103 and / or by displaying a warning on the display unit 104. The notification content at this time includes, for example, the name and position of the sensor 101, 102 determined to have an abnormality, and the details of the abnormality (disconnection, signal degradation, etc.).

[0068] Next, the processing procedure of the wiring method according to the embodiment will be described with reference to Fig. 8. Fig. 8 is a flowchart showing the processing procedure of the wiring method according to the embodiment. The entity that executes the processing procedure shown in Fig. 8 is, for example, a worker in charge of wiring work when installing the RNC system 1 in the vehicle V. Here, it is assumed that the entity is the worker.

[0069] First, the worker sets a first priority, which is the priority of each area to be silenced, according to the noise silencing performance required in the RNC system 1 to be implemented (step S101).

[0070] Then, the operator sets second priorities, which are used in the RNC processing of each area, that is, priorities of the sensors 101 and 102 according to the position values ​​of the sensors 101 and 102 corresponding to each area (step S102).

[0071] Then, the worker connects the sensors 101, 102 so that they are daisy-chained in order from the area with the highest first priority to the sensor 101, 102 with the highest second priority (step S103), and then ends the process.

[0072] As described above, the wiring method according to the embodiment is a wiring method in which an RNC device 10 (corresponding to an example of a "silencer") that executes RNC processing of a vehicle (corresponding to an example of a "driving noise removal processing") is connected to one end of a cable, and multiple sensors 101, 102 used in the RNC processing are connected to the cable, and includes connecting the sensors 101, 102, which are set to have higher priorities in order of higher silencing performance for the RNC processing, from a position on the cable closest to the RNC device 10.

[0073] Therefore, according to the wiring method of the embodiment, it is possible to further ensure the reliability of the RNC for removing road noise in the vehicle interior space.

[0074] In addition, the wiring method according to the embodiment further includes setting the priority of the sensors 101, 102 corresponding to a wideband region where the frequency band to be silenced is wide to be higher than the priority of the sensors 101, 102 corresponding to a narrowband region where the frequency band is narrower than the wideband region.

[0075] Therefore, according to the wiring method of the embodiment, it is possible to easily ensure noise reduction performance when performing RNC processing in the wideband region, which is highly important.

[0076] Furthermore, the above setting is performed so that the closer the sensors 101 and 102 are positioned to the RNC device 10, the higher the priority is set in each of the wideband area and narrowband area.

[0077] Therefore, according to the wiring method of the embodiment, the sensors 101, 102 with higher priorities in both the wideband area and the narrowband area are less likely to suffer from problems such as disconnection or signal attenuation, thereby further ensuring the reliability of the RNC for removing road noise in the vehicle interior space.

[0078] The sensor 102 is a microphone.

[0079] Therefore, according to the wiring method of the embodiment, it is possible to easily ensure noise reduction performance when performing RNC processing using a microphone.

[0080] The sensor 101 is an acceleration sensor.

[0081] Therefore, according to the wiring method of the embodiment, it is possible to easily ensure noise reduction performance when performing RNC processing using an acceleration sensor.

[0082] Moreover, the RNC device 10 according to the embodiment is a noise suppression device equipped with a control unit 13 (corresponding to an example of a "controller") that executes RNC processing for a vehicle using a plurality of sensors 101, 102 that are daisy-chain connected to wiring (corresponding to an example of "sequential connection"). The sensors 101, 102 are connected so that the sensors 101, 102 that are set with higher priorities according to the noise suppression performance required for the RNC processing are placed higher in the connection order to the RNC device 10.

[0083] Therefore, the RNC device 10 according to the embodiment can further ensure the reliability of the RNC for removing road noise in the vehicle interior space.

[0084] In addition, the control unit 13 monitors the status of the sensors 101 and 102 based on the sensor data from the sensors 101 and 102, and if the monitoring results determine that there is an abnormality in either of the sensors 101 and 102, it logically disconnects the sensor 101 or 102 determined to be abnormal to the end of the connection, and executes the above-mentioned RNC processing using only the sensors 101 and 102 that are not disconnected.

[0085] Therefore, according to the RNC device 10 of the embodiment, even if there is an abnormality in the sensors 101, 102, the RNC processing can be continued using the normal sensors 101, 102, thereby further ensuring the reliability of the RNC for removing road noise in the vehicle interior space.

[0086] Furthermore, if there is an abnormality in the sensors 101 and 102, the control unit 13 notifies the user of the abnormality in the sensors 101 and 102 by means of either or both of a sound and a visual warning.

[0087] Therefore, the RNC device 10 according to the embodiment makes it easy to notify the user that a sensor abnormality has occurred in the RNC system 1.

[0088] In the above-described embodiment, an example was given in which four sensors 101, eight sensors 102, and nine speakers 103 were provided, but the numbers are not limited to these. The numbers and positions of the sensors 101, 102, and speakers 103 can be adjusted as appropriate depending on the noise reduction performance required for each area of ​​the RNC system 1 to be implemented.

[0089] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0090] 1 RNC system 10 RNC equipment 11 Communications Department 12 Storage section 12a Processing parameter information 12b Status Information 13 Control Unit 13a Acquisition part 13b RNC processing section 13c Monitoring Department 101 Sensor (acceleration sensor) 102 Sensor (microphone) 103 Speaker 104 Display section V vehicle

Claims

1. A wiring method in which a silencer that performs a process for eliminating vehicle running noise is connected to one end of a cable, and a plurality of sensors used in the process for eliminating the running noise are connected to the cable, the sensor having a higher priority in descending order of noise reduction performance in the running noise removal process is connected from a position on the cable closest to the noise reduction device; Wiring methods including:

2. setting a priority of the sensor corresponding to a wide band region where the frequency band to be silenced is wide to be higher than a priority of the sensor corresponding to a narrow band region where the frequency band is narrower than the wide band region; The wiring method of claim 1 further comprising:

3. The setting In each of the wideband region and the narrowband region, a higher priority is set for the sensor located closer to the silencer. The wiring method according to claim 2 .

4. The sensor is a microphone.

4. The wiring method according to claim 1, 2 or 3.

5. the sensor is an acceleration sensor; 4. The wiring method according to claim 1, 2 or 3.

6. A noise suppression device including a controller that executes a process for removing vehicle running noise using a plurality of sensors sequentially connected to wiring, The sensor The sensor is connected so that the higher the priority level of the sensor is set according to the noise reduction performance required for the running noise removal process, the higher the connection order of the sensor to the noise reduction device. Silencer.

7. The controller monitors the states of the sensors based on sensor data from the sensors, and when it is determined from the monitoring results that there is an abnormality in any of the sensors, logically disconnects the sensor determined to be abnormal to the end of the connection, and executes the running noise removal process using only the sensors that are not disconnected; 7. The silencer according to claim 6.

8. The controller If an abnormality occurs in the sensor, the abnormality is notified by one or both of a sound and a visual warning.

8. A silencer according to claim 6 or 7.

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