JP6378019B2 - Sound detection device - Google Patents

Description

  The present invention relates to a sound detection device.

  2. Description of the Related Art A sound detection device has been developed that detects a sound around a vehicle such as the approach of another vehicle to a driver by detecting a sound outside the vehicle. For example, Patent Document 1 discloses an apparatus in which a microphone for collecting sounds around a vehicle is installed on the outer surface of the vehicle. In the apparatus of Patent Document 1, the microphone is housed inside a teardrop-shaped cover. The cover has a slit that is waterproofed by an acoustically permeable membrane or an acoustically permeable wall.

JP 2008-207793 A

  By the way, in the sound detection device as in Patent Document 1, the microphone is housed inside the cover and is not exposed outside the vehicle. Therefore, there is a problem that it is difficult to improve the accuracy of detecting the sound outside the vehicle. On the other hand, when the microphone is exposed to the outside of the vehicle, there is a problem that noise to the microphone due to wind increases.

  Therefore, the present invention can improve the accuracy of detecting the sound outside the vehicle by the microphone while reducing the noise to the microphone due to the wind in the sound detection device including the microphone that detects the sound outside the vehicle. An object is to provide a sound detection device.

  One aspect of the present invention is a sound detection device including a microphone that is attached to be exposed on the outer surface of a vehicle and detects a sound outside the vehicle, and covers the side of the microphone in the traveling direction of the vehicle. A first shield part that protrudes from the outer surface to the outside of the vehicle and a second shield that covers the side of the microphone opposite to the traveling direction of the vehicle and protrudes from the outer surface to the outside of the vehicle. And the microphone is exposed from the opening between the first shield part and the second shield part, and the projecting length from the outer surface of the first shield part to the outside of the vehicle is that of the second shield part. This is a sound detection device that is longer than the protruding length from the outer surface to the outside of the vehicle.

  According to this configuration, the traveling wind from the traveling direction of the vehicle is blocked by the first shield portion, and the traveling wind is prevented from hitting the microphone. Further, the second shield portion blocks the environmental wind from the direction opposite to the traveling direction of the vehicle, and prevents the environmental wind from hitting the microphone. Thereby, noise to the microphone due to wind can be reduced. Further, since the microphone is exposed to the outside of the vehicle through the opening, the accuracy of detecting the sound outside the vehicle by the microphone can be improved. Furthermore, the protruding length of the first shield portion from the outer surface of the vehicle to the outside of the vehicle is longer than the protruding length of the second shield portion from the outer surface of the vehicle to the outside of the vehicle. Thereby, it is possible to prevent the aerodynamic sound caused by the traveling wind hitting the second shield part from reverberating between the first shield part and the second shield part, and to reduce the noise to the microphone caused by the wind. With the above configuration, it is possible to improve the accuracy of detecting sound outside the vehicle by the microphone while reducing noise to the microphone due to wind.

  According to the above aspect of the present invention, in the sound detection device including the microphone for detecting the sound outside the vehicle, the accuracy of detecting the sound outside the vehicle by the microphone is reduced while reducing noise to the microphone due to wind. Can be improved.

It is a left view which shows the vehicle carrying the sound detection apparatus which concerns on 1st Embodiment and 2nd Embodiment. It is a perspective view which shows the door mirror of 1st Embodiment. It is a rear view which shows the door mirror of 1st Embodiment. It is a bottom view which shows the door mirror of 1st Embodiment. It is a left view which shows the door mirror of 1st Embodiment. It is sectional drawing by the AA line of FIG. It is sectional drawing by the BB line of FIG. It is a figure which shows propagation of the aerodynamic sound in FIG. It is a perspective view which shows the front bumper of 2nd Embodiment. It is a bottom view which shows the front bumper of 2nd Embodiment. It is sectional drawing by CC line of FIG. It is a graph which shows the noise amount of the experiment example with respect to the frequency of an audible range, and a comparative example.

  Hereinafter, a sound detection device according to an embodiment of the present invention will be described in detail with reference to the drawings. The first embodiment of the present invention will be described below. In the vehicle 10 shown in FIG. 1, the sound detection device of this embodiment is configured as a door mirror 100 of the vehicle 10. The door mirror 100 according to the present embodiment is a device that detects, for example, a footstep sound of a pedestrian or an engine sound of another vehicle as a sound signal by using a microphone attached to the door mirror 100 in a place where visibility is poor. An audio signal outside the vehicle 10 detected by the microphone is amplified by a known amplifier and output to the driver of the vehicle 10 by a speaker.

  As shown in FIG. 2 which is a perspective view and FIG. 3 which is a rear view, the door mirror 100 of this embodiment includes a mirror plate 102 similar to a general door mirror. The mirror plate 102 is attached by a known technique so that the angle of the mirror plate 102 can be changed according to the operation of the driver of the vehicle 10. The door mirror 100 is attached to the vehicle 10 via a folding unit 120. The door mirror 100 is attached so that it can be folded by the folding part 120 toward the back of the vehicle 10 like a general door mirror.

  The door mirror 100 includes an opening 108 that opens downward at the bottom of the door mirror 100. The door mirror 100 includes a first shield part 104 on the side of the opening 108 in the traveling direction (front) D of the vehicle 10. The door mirror 100 includes a second shield part 106 on the opposite side (rear side) of the opening 108 to the traveling direction D of the vehicle 10. Note that the door mirror 100 of the present embodiment is configured to detect a sound outside the vehicle 10 when the vehicle 10 is moving forward, so the traveling direction D of the vehicle 10 means the front of the vehicle 10. To do.

  As shown in FIG. 4, which is a bottom view, the door mirror 100 has a mounting surface 112 at the back of the opening 108. A microphone 110 is attached to the attachment surface 112. The microphone 110 is attached so as to be exposed on the outer surface of the vehicle 10 and detects sound outside the vehicle 10.

  The outer surface of the vehicle 10 is not necessarily limited to the outer surface of the vehicle body of the vehicle 10, and includes, for example, the mounting surface 112 of the door mirror 100 that is a member that can be attached to and detached from the vehicle body of the vehicle 10. In addition, the microphone 110 is not necessarily exposed when the entire microphone 110 is exposed, as long as the vibrating body of the microphone 110 that is vibrated by sound outside the vehicle 10 is exposed. Moreover, the microphone 110 may have a cover attached to the vibrating body of the microphone 110 that is vibrated by sound outside the vehicle 10, for example. For example, a condenser type or moving coil type microphone can be applied to the microphone 110. As shown in FIG. 5 which is a left side view, the door mirror 100 has the same shape as a general door mirror in a side view.

  Hereinafter, the internal structure of the door mirror 100 of this embodiment will be described. In addition, about the structure which changes the angle of the mirror surface plate 102 of the door mirror 100, since it is a well-known technique, description is abbreviate | omitted. In addition, a configuration in which an audio signal detected by the microphone 110 is amplified and sound outside the vehicle 10 is output to the driver of the vehicle 10 by a speaker is also a known technique, and thus description thereof is omitted.

  As shown in FIG. 6 which is a cross-sectional view taken along the line AA in FIG. 3 and FIG. 7 which is a cross-sectional view taken along the line BB in FIG. 5, the first shield portion 104 is the vehicle 10 of the microphone 110. Is provided so as to cover the traveling direction D side, and protrudes from the mounting surface 112 to the outside (downward) of the vehicle 10. The second shield part 106 is provided so as to cover the side of the microphone 110 opposite to the traveling direction D of the vehicle 10, and protrudes from the mounting surface 112 to the outside (downward) of the vehicle 10. The microphone 110 is exposed from the opening 108 between the first shield part 104 and the second shield part 106. Note that the opening 108 does not necessarily need to be configured by one opening. For example, the opening 108 may be configured by a plurality of small holes, slits, or the like through which air can flow. The opening 108 may be covered with a net-like member through which air can flow.

  The protruding length L1 of the first shield part 104 from the mounting surface 112 to the lower side of the vehicle 10 is longer than the protruding length L2 of the second shield part 106 from the mounting surface 112 to the lower side of the vehicle 10. In addition, the positional relationship with respect to the advancing direction D of the vehicle 10 of the 1st shield part 104, the 2nd shield part 106, and the opening part 108 mentioned above, and the relationship between the protrusion length L1 and the protrusion length L2 are the use states of the door mirror 100. For example, when the door mirror 100 is folded by the folding unit 120, it may not be applicable.

  Hereinafter, the operation and effect of the door mirror of this embodiment will be described. In this embodiment, the influence of pop noise and aerodynamic sound, which are causes of noise of the microphone 110 due to wind, is reduced. The pop noise is noise caused by direct hit of the wind microphone 110. The aerodynamic sound is noise such as wind noise generated when the wind hits a structure on the outer surface of the vehicle 10.

  As shown in FIG. 8, in the present embodiment, the traveling wind W of the vehicle 10 sprayed from the traveling direction D side is blocked by the first shield portion 104 projecting from the mounting surface 112 with the projecting length L1, and The direct hit of the traveling wind W is reduced. The traveling wind W means wind that strikes the outer surface of the vehicle 10 as the vehicle 10 travels in the traveling direction D. In addition, the environmental shield from the side opposite to the traveling direction of the vehicle is blocked by the second shield portion 106 protruding from the mounting surface 112 with the protruding length L2, and the direct impact of the environmental wind on the microphone 110 is reduced. The environmental wind means a wind generated by a weather condition around the vehicle 10.

  When the traveling wind W hits the lower end of the first shield part 104, a vortex V is generated. Aerodynamic sounds S and s are generated by the vortex V. However, the aerodynamic sound s on the lower side of the aerodynamic sounds S and s is blocked by the first shield part 104 and is prevented from reaching the microphone 110. On the other hand, the aerodynamic sound S reaches the microphone 110. However, the protruding length L2 of the second shield part 106 from the mounting surface 112 is shorter than the protruding length L1 of the first shield part 104 from the mounting surface 112. Therefore, the aerodynamic sound S hitting the second shield part 106 is prevented from reverberating between the first shield part 104 and the second shield part 106. With the above operation, the influence of pop noise and aerodynamic sound, which are causes of noise of the microphone 110, is reduced.

  In the door mirror 100 of the present embodiment, in addition to reducing the pop noise caused by the traveling wind W and reducing the echo of the aerodynamic sound S, the vehicle body of the vehicle 10 is located on the side opposite to the traveling direction D. The protrusion length L2 of the second shield part 106 is set to be shorter than the protrusion length L1 of the first shield part 104 because it exists, the fluid resistance increases, and the environmental wind becomes weak.

  In the present embodiment, the traveling wind W from the traveling direction D of the vehicle 10 is blocked by the first shield part 104, and the traveling wind W is prevented from hitting the microphone 110. Further, the second shield part 106 blocks the environmental wind from the direction opposite to the traveling direction D of the vehicle 10, and prevents the environmental wind from hitting the microphone 110. Thereby, noise to the microphone 110 due to wind can be reduced. Further, since the microphone 110 is exposed to the outside of the vehicle 10 through the opening 108, the accuracy of detecting the sound outside the vehicle 10 by the microphone 110 can be improved. Further, the protruding length L1 from the mounting surface 112 of the first shield part 104 to the outside of the vehicle 10 is longer than the protruding length L2 of the second shield part 106 from the mounting surface 112 to the outside of the vehicle 10. As a result, the aerodynamic sound S caused by the traveling wind W hitting the second shield part 106 is prevented from reverberating between the first shield part 104 and the second shield part 106, and noise to the microphone 110 due to wind is reduced. Can be made. With the above configuration, it is possible to improve the accuracy of detecting sound outside the vehicle 10 by the microphone 110 while reducing noise to the microphone 110 due to wind.

  Hereinafter, a second embodiment of the present invention will be described. In the vehicle 10 shown in FIG. 1, the sound detection device of the present embodiment is configured as a front bumper 200 of the vehicle 10. As shown in FIG. 9, which is a perspective view, the front bumper 200 of this embodiment includes a first shield part 204, a second shield part 206, an opening 208, a microphone 210, and a mounting surface 212 similar to those in the first embodiment. Prepare. By arranging the microphone 210 and the like on the front bumper 200, the length of the front bumper 200 can be appropriately changed with respect to the length of the existing front bumper.

  As shown in FIG. 9 and FIG. 10, which is a bottom view, the front bumper 200 includes an opening 208 that opens downward at the bottom of the front bumper 200, and has a mounting surface 212 at the back of the opening 208. A microphone 210 is attached to the attachment surface 212. Thereby, in this embodiment, the microphone 210 is attached so that it may be exposed to the outer surface of the vehicle 10, and the sound outside the vehicle 10 is detected.

  As shown in FIG. 11, which is a cross-sectional view taken along the line CC in FIG. 10, the first shield part 204 is provided so as to cover the traveling direction (front) D side of the vehicle 210 of the microphone 210. Projecting from the surface 212 to the outside (downward) of the vehicle 10. The second shield portion 206 is provided so as to cover the side of the microphone 210 opposite to the traveling direction D of the vehicle 10 (backward), and protrudes from the mounting surface 212 to the outside (downward) of the vehicle 10. . The microphone 210 is exposed from the opening 208 between the first shield part 204 and the second shield part 206. As in the first embodiment, the opening 208 does not necessarily have to be configured by a single opening. For example, the opening 208 is configured by a plurality of small holes, slits, mesh members, or the like. May be. The protruding length L3 of the first shield part 204 from the mounting surface 212 to the lower side of the vehicle 10 is longer than the protruding length L4 of the second shield part 206 from the mounting surface 212 to the lower side of the vehicle 10. The front bumper 200 of this embodiment has the same effects as the door mirror 100 of the first embodiment.

  In the vehicle 10 shown in FIG. 1, the sound detection device of the present embodiment may be configured as a rear bumper 300 of the vehicle 10. In this case, since the rear bumper 300 is configured to detect a sound outside the vehicle 10 when the vehicle 10 is moving backward, the traveling direction D of the vehicle 10 means the rear of the vehicle 10. . The first shield part 204 is provided so as to cover the traveling direction (rear) D side of the microphone 210 of the vehicle 10, and the second shield part 206 is a direction opposite to the traveling direction D of the microphone 210 of the vehicle 10 (frontward). ) Is provided so as to cover the side. Similar to the front bumper 200, the microphone 210 is exposed from the opening 208 between the first shield part 204 and the second shield part 206, and protrudes downward from the mounting surface 212 of the first shield part 204 to the vehicle 10. The length L3 is longer than the length L4 projecting downward from the mounting surface 212 of the second shield part 206 to the vehicle 10, and thus has the same effect as the front bumper 200.

  It should be noted that the present invention can be implemented in various forms including various modifications and improvements based on the knowledge of those skilled in the art including the above-described embodiments. For example, the door mirror 100 of the above embodiment may be configured as a fender mirror. Or the door mirror 100 of the said embodiment may be comprised as a submirror which projects the blind spot of the door mirror 100. FIG. Further, for example, the door mirror 100 of the above embodiment does not limit the function as an existing door mirror, and for example, a sub mirror that reflects the blind spot of the mirror may be attached to the door mirror 100. Further, the door mirror 100 may be provided with a lamp or the like that blinks or lights in conjunction with a direction indicator or the like.

  Moreover, in the said embodiment, it demonstrated centering on the aspect with which the microphones 110 and 210 were attached so that it might expose below the door mirror 100, the front bumper 200, and the rear bumper 300. FIG. However, the microphone 110 may be attached so as to be exposed to the side or above the door mirror 100. The microphone 210 may be attached so as to be exposed to the side of the front bumper 200 and the rear bumper 300. Alternatively, the microphones 110 and 210 may be attached so as to be exposed to the side, lower, or upper side of the vehicle body of the vehicle 10, for example. In any of the above cases, the positional relationship of the first shield portions 104 and 204, the second shield portions 106 and 206, and the openings 108 and 208 with respect to the traveling direction D of the vehicle 10, and the protruding lengths L1 and L3 and the protruding length L2 , L4 are arranged so that the relationship with L4 is the same as that of the above-described embodiment, so that the effect of the above-described embodiment is exhibited.

(Experimental example)
As an experimental example, the present inventors measured the amount of noise caused by wind in the audible range of 1 kHz to 5 kHz using the door mirror 100 described above. The inventors measured the amount of noise when a wind of 3 m / s was blown from the direction of travel direction D. In addition, as a comparative example, the present inventors similarly applied a noise amount to a door mirror in which the protrusion length L2 of the second shield part 106 of the door mirror 100 described above is the same as the protrusion length L1 of the first shield part 104. Was measured.

  As shown in FIG. 12, it can be seen that the amount of noise caused by wind of 1 kHz to 5 kHz in the audible range in the experimental example is reduced as compared with the comparative example. Moreover, as shown in FIG. 12, it turns out that the noise amount of an experiment example is reduced compared with the comparative example in the high sound range in the audible range. Further, in the result of FIG. 12, the amount of noise was less than the measurement range in the vicinity of 5 kHz.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 100 ... Door mirror, 102 ... Mirror plate, 104 ... 1st shield part, 106 ... 2nd shield part, 108 ... Opening part, 110 ... Microphone, 112 ... Mounting surface, 120 ... Folding part, 200 ... Front bumper 204 ... 1st shield part, 206 ... 2nd shield part, 208 ... Opening part, 210 ... Microphone, 212 ... Mounting surface, 300 ... Rear bumper, D ... Traveling direction, L1, L2, L3, L4 ... Projection length, W: Running wind, V: Vortex, S: Aerodynamic sound, s: Aerodynamic sound.

Claims (1)

A sound detection device including a microphone that is attached to be exposed on an outer surface of a vehicle and detects a sound outside the vehicle,
Have covered the side of the front of the vehicle of the microphone, is provided as traveling wind of the vehicle blown from the side of the front of the vehicle is blocked, the first shield portion projecting from the outer surface to the outside of the vehicle When,
Wherein not covering the sides of the rear of the vehicle microphone, provided such environmental air is shielded from the side of the rear of the vehicle, and a second shield portion projecting from the outer surface to the outside of the vehicle, a Prepared,
The microphone is exposed from the opening between the first shield part and the second shield part to the side, below or above the vehicle body of the vehicle ,
The sound detection device, wherein a protruding length of the first shield part from the outer surface to the outside of the vehicle is longer than a protruding length of the second shield part from the outer surface to the outside of the vehicle.

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