JP2020045037A - Sound reproduction device, sound reproduction method, sound reproduction program, and storage medium - Google Patents

Abstract

To provide a sound reproduction device which can reproduce external sound of a movable body as it is while enabling a driver to distinguish the external sound from internal sound at the interior, and to provide a sound reproduction method, a sound reproduction program, and a storage medium.SOLUTION: A sound reproduction device 100 is characterized by including: a sound acquisition part 110 which acquires external sound of a movable body 1; a reproduction part 120 which reproduces the external sound acquired by the sound acquisition part 110 at the interior of the movable body 1; and an informing part 130 which informs a driver of the movable body 1 that the sound reproduced by the reproduction part 120 is the external sound.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sound reproducing device for acquiring a sound outside a moving body and reproducing the sound inside, a sound reproducing method, a sound reproducing program, and a storage medium storing the sound reproducing program.

  2. Description of the Related Art Conventionally, there has been proposed a technique for acquiring a sound outside a moving body and reproducing the sound inside the moving body (for example, see Patent Document 1). According to the technology described in Patent Document 1, noise inside the moving body is suppressed, and a sound that the driver needs to pay attention to, such as a sound from an emergency vehicle, is extracted from the external sound and emphasized inside the vehicle. It is to be played. Thereby, the sound to be paid attention reaches the driver's ear without being buried in the noise inside the moving body.

JP 2006-023587 A

  Here, when a sound outside the moving object is reproduced inside, there is a possibility that the reproduced sound may be similar to the sound inside. As an example of such a situation, for example, there is a situation in which a child's voice is outside the moving object, and the boarding child is making noise inside the moving object. Alternatively, there may be a situation where the sound of the emergency vehicle is sounding outside the moving object, and the same kind of sound is sounding from the radio or the like inside the moving object.

  In such a situation, even if the voice of an external child or the sound of an emergency vehicle is emphasized and reproduced as in the technique described in Patent Document 1, the driver will still hear the inside of the moving body. In some cases, the sound cannot be immediately distinguished from the sound of the sound, and the response is delayed.

  In addition, in reproducing the sound outside the moving object inside, the sound outside the moving body is not changed as much as possible as in the technique described in Patent Literature 1, but the sound outside the moving body is not changed as much as possible. There are also requests to do so.

  Therefore, an object of the present invention is to provide a sound reproducing apparatus, a sound reproducing method, and a sound reproducing method that can reproduce a sound outside of a moving object as it is, while being distinguishable from a sound inside the vehicle. Providing a program and a storage medium is an example.

  In order to solve the above-described problem and achieve the object, a sound reproduction device of the present invention includes a sound acquisition unit that acquires a sound external to a moving object, and the sound acquisition unit that moves the external sound acquired by the sound acquisition unit. It is characterized by comprising a reproducing unit for reproducing the sound inside the body, and a notifying unit for notifying a driver of the moving body that the sound reproduced by the reproducing unit is the external sound.

  In order to solve the above-described problems and achieve the object, a sound reproduction method of the present invention includes a sound acquisition step of acquiring a sound external to a moving body, and the external sound acquired in the sound acquisition step. It is characterized by comprising a reproducing step of reproducing inside the moving body, and a notifying step of notifying a driver of the moving body that the reproduced sound in the reproducing step is the external sound.

  Further, in order to solve the above-described problems and achieve the object, a sound reproduction program of the present invention causes a computer to execute the above-described sound reproduction method of the present invention.

  In order to solve the above-described problems and achieve the object, a storage medium of the present invention stores the above-described sound reproduction program of the present invention.

FIG. 2 is a schematic block diagram illustrating a sound reproducing device mounted on a moving object. FIG. 2 is a schematic diagram illustrating a display screen on which a notification unit illustrated in FIG. 1 visually notifies. 3 is a flowchart illustrating a flow of a process in a sound reproducing method executed by the sound reproducing device illustrated in FIG. 1. FIG. 11 is a schematic block diagram illustrating a sound reproducing device according to a second embodiment mounted on a moving object. 5 is a flowchart illustrating a flow of a process in a sound reproducing method performed by the sound reproducing device illustrated in FIG. 4.

  Hereinafter, embodiments of the present invention will be described. A sound reproduction device according to an embodiment of the present invention includes a sound acquisition unit, a reproduction unit, and a notification unit. The sound acquisition unit acquires a sound outside the moving object. The reproduction unit reproduces the external sound acquired by the sound acquisition unit inside the moving object. The notifying unit notifies the driver of the moving body that the sound reproduced by the reproducing unit is an external sound.

  According to the sound reproducing device of the present embodiment, when the external sound acquired by the sound acquiring unit is reproduced inside the moving object, the driver performs the notification by the notification unit separately from the reproduction by the reproducing unit. Can recognize that the reproduced sound is an external sound. Thus, the sound outside the moving object can be reproduced as it is while the driver can distinguish the sound inside from the inside.

  Here, in the sound reproducing device of the present embodiment, the notification unit is an indicator for visually notifying that the reproduced sound is an external sound.

  According to the present embodiment, the notification is performed in a manner that appeals to the visual sense that the driver can easily recognize, so that the external sound can be reproduced in a state where the driver can easily distinguish the internal sound from the internal sound.

  Further, in the present embodiment, the notification unit notifies that the reproduced sound is an external sound together with the position or area where the external sound has occurred.

  According to the present embodiment, since the driver's attention can be directed toward the position or area where the external sound has occurred, the driver's recognizability of the external situation can be improved.

  In addition, the sound reproduction device of the present embodiment includes an internal sound acquisition unit that acquires sounds inside the moving object. Then, the notification unit notifies the external sound according to the degree of similarity between the external sound and the internal sound.

  According to the present embodiment, the notification is performed according to the degree of similarity between the external sound and the internal sound, so that the notification is performed less frequently and the driver's attention is not distracted. When the necessity is high, it is possible to surely notify the driver and effectively alert the outside sound.

  In addition, the sound reproducing device of the present embodiment includes an internal sound storage unit that stores information on internal sounds acquired from a predetermined acquisition start time by the internal sound acquisition unit. Then, the notification unit is further configured to notify according to the degree of similarity between the external sound and the internal sound stored in the internal sound storage unit.

  When a sound source similar to an external sound exists inside the moving object, the sound of the source is not always acquired at the same timing as the external sound is acquired. According to the present embodiment, information on the sound of such a source is stored including the sound emitted in the past. Then, the notification unit notifies based on the degree of similarity between the stored sound and the external sound. Thus, even when the source of the similar sound does not emit a sound internally when the external sound is acquired, the driver can be notified and the external sound can be effectively alerted.

  Further, the sound reproduction method according to the embodiment of the present invention includes a sound acquisition step, a reproduction step, and a notification step. The sound acquisition step is a step of acquiring sound outside the moving body. The reproduction step is a step of reproducing the external sound acquired in the sound acquisition step inside the moving body. The notifying step is a step of notifying the driver of the moving body that the reproduced sound in the reproducing step is an external sound.

  According to the sound reproducing method of the present embodiment, when the external sound acquired in the sound acquiring step is reproduced inside the moving body, the driver performs the notification in the notification step separately from the reproduction in the reproducing step, and Can recognize that the reproduced sound is an external sound. Thus, the sound outside the moving object can be reproduced as it is while the driver can distinguish the sound inside from the inside.

  A sound reproducing program according to an embodiment of the present invention causes a computer to execute the above-described sound reproducing method.

  According to the sound reproduction program according to the present embodiment, by executing the above-described sound reproduction method by a computer, the sound outside the moving object can be distinguished from the sound inside by the driver inside, but the sound is not changed. It can be reproduced in the state of.

  The storage medium according to the embodiment of the present invention stores the above-described sound reproduction program.

  According to the storage medium of the present embodiment, the above-described sound reproducing method can be executed by a computer using the stored sound reproducing program. Thus, the sound outside the moving object can be reproduced as it is while the driver can distinguish the sound inside from the inside.

  Hereinafter, an embodiment for solving the problem of reproducing a sound outside the moving object inside the vehicle in a state in which the driver can distinguish it from the inside sound will be specifically described with reference to the drawings. First, a first embodiment will be described.

  FIG. 1 is a schematic block diagram showing a sound reproducing device of a first embodiment mounted on a moving body.

  The moving body 1 shown in FIG. 1 is a passenger car and includes a sound reproducing device 100.

  The sound reproducing device 100 is a device that acquires a sound outside the moving body 1 and reproduces the sound inside, and includes a sound acquiring unit 110, a reproducing unit 120, and a notifying unit 130.

  The sound acquisition unit 110 is a unit that acquires a sound outside the moving body 1 and a sound inside the moving body 1, and includes four external sound microphones 111, one internal sound microphone 112, and an acquisition control unit 113. , Is provided. The external sound microphones 111 are arranged at four places, that is, two places on the front side and two places on the rear side of the moving body 1. Further, the internal sound microphone 112 is arranged at a position inside the moving body 1 where the sound is easily acquired. The acquisition control unit 113 controls the operation of acquiring sound by the external sound microphone 111 and the internal sound microphone 112.

  The four external sound microphones 111 and the acquisition control unit 113 constitute an external sound acquisition unit that acquires sounds outside the mobile unit 1. One internal sound microphone 112 and the acquisition control unit 113 configure the inside of the mobile unit 1. An internal sound acquisition unit for acquiring sound is configured.

  Note that the number and arrangement of the external sound microphones 111 and the internal sound microphones 112 are not limited to the numbers and arrangements of the present embodiment, but can be set to arbitrary numbers and arrangements.

  In the present embodiment, the acquisition control unit 113 appropriately synthesizes the sounds acquired by the four external sound microphones 111, and sends sound data representing the synthesized sound to the reproduction unit 120. The acquisition control unit 113 also performs similarity determination between the external sound obtained by each of the four external sound microphones 111 and the internal sound obtained by one internal sound microphone 112, and notifies the determination result. Send to section 130.

  The similarity determination in the acquisition control unit 113 is performed by frequency analysis of the external sound acquired by each external sound microphone 111 and the internal sound acquired by the internal sound microphone 112. Then, it is determined whether or not the ratio of similar frequency components exceeds a predetermined ratio in both the external sound and the internal sound. In the present embodiment, such a determination is made for each of the external sounds acquired by the four external sound microphones 111. If at least one of the sounds acquired by the four external sound microphones 111 has a similar frequency component to the sound acquired by the internal sound microphone 112, the acquisition control is performed. The unit 113 determines that the similarity between the sounds inside and outside the moving object 1 is high. On the other hand, when there is no one in which the ratio of the similar frequency components exceeds the predetermined ratio, the acquisition control unit 113 determines that the similarity of the sounds inside and outside the moving object 1 is low.

  In FIG. 1, as an example of a case where it is determined that the similarity of sounds inside and outside the moving body 1 is high, a child CH1 is singing outside the right rear of the moving body 1 and boarding even inside the moving body 1. A situation has been cited in which a child CH2 who has gone is making noise. In such a case, the frequency components specific to the child's voice, that is, the frequency components similar to each other, in both the external sound and the internal sound obtained by the right external sound microphone 111 among the four external sound microphones 111 Will exceed the predetermined ratio. As a result, the acquisition control unit 113 determines that the similarity between the sound outside the moving object 1 and the sound inside the moving object 1 is high.

  Note that the determination method of the similarity determination in the present embodiment is merely an example, and any determination method can be adopted as long as the similarity between the external sound and the internal sound can be determined.

  The reproduction unit 120 reproduces an external sound acquired by the acquisition control unit 113 and sent from the acquisition control unit 113 as sound data from a speaker arranged at an arbitrary position inside the moving body 1.

  The notifying unit 130 notifies the driver of the mobile unit that the sound reproduced by the reproducing unit 120 is an external sound. In the present embodiment, the notification unit 130 receives a determination result of the similarity determination performed by the acquisition control unit 113 in the sound acquisition unit 110 and issues a notification according to the degree of similarity between the external sound and the internal sound. . That is, the notification unit 130 notifies when the similarity determination result indicates that the similarity is high, and does not perform the notification when the determination result indicates that the similarity is low.

  Here, in the present embodiment, the notification unit 130 is an indicator for visually notifying that the reproduced sound is an external sound via a display screen described below.

  FIG. 2 is a schematic diagram illustrating a display screen on which the notification unit illustrated in FIG. 1 visually notifies.

  As shown in FIG. 2, on a display screen 131 for the notification unit 130 to give a notification, a moving object image 131a representing the moving object 1 as a passenger car is arranged at the center. At four positions surrounding the moving object image 131a, lighting images 131b for notifying that the reproduced sound is an external sound by lighting display are arranged. The four lighting images 131b correspond to the four external sound microphones 111 shown in FIG. Then, the lighting image 131b corresponding to the external sound microphone 111 that has acquired a sound with high similarity is configured to be lit and displayed. Through such a display screen 131, the notification unit 130 indicates that the reproduced sound is an external sound, together with the position of the external sound microphone 111 that has acquired the sound, that is, the position where a highly similar sound has been generated. Notice. In the example of FIG. 2, it is shown that a sound with a high similarity is generated at a position on the right rear side of the moving object 1.

  The notification by the notification unit 130 is not limited to the notification via the display screen 131. The notification may be, for example, notification by displaying a message text, or may be notification by a message voice or an alert sound. Further, the notification may be made via the display screen, or may be notified together with a rough area including the position where the external sound is generated, such as the right side or the rear side of the moving body 1. Further, it is also possible to simply notify that the reproduced sound is the external sound without telling the position or the area where the external sound is generated. Also, the notification may be made via a simple LED indicator or the like instead of the display screen 131.

  In the present embodiment, the acquisition control unit 113 in the sound acquisition unit 110, the control unit other than the speaker in the reproduction unit 120, and the control unit other than the display screen 131 in the notification unit 130 are built in some computer mounted on the mobile unit 1. Is done. An example of such a computer device is, for example, a computer of a navigation device. An example of the display screen 131 in the notification unit 130 includes, for example, a display screen in a navigation device. Note that the computer on which the above-described control unit is constructed may be a computer mounted on the moving body 1 separately from the navigation device, and the display screen 131 is also provided on the moving body 1 separately from the navigation device. It may be a mounted display screen.

  Next, an information processing method executed in the above-described sound reproducing device 100 will be described.

  FIG. 3 is a flowchart showing a flow of processing in a sound reproducing method executed by the sound reproducing device shown in FIG.

  The process represented by this flowchart starts when the power of the computer in which the sound reproducing device is constructed is turned on.

  When the process starts, first, a sound acquisition step by the sound acquisition unit 110 is executed (step S101). In the sound acquisition step (step S101), the sound inside and outside the moving object 1 is acquired by the external sound microphone 111 and the internal sound microphone 112 under the control of the acquisition control unit 113. As for the external sound, the acquisition control unit 113 appropriately synthesizes the acquired sounds from the four external sound microphones 111, and sends sound data representing the synthesized sound to the reproduction unit 120.

  When the inside and outside sounds are acquired, the acquisition control unit 113 determines the similarity of those sounds (step S102). This similarity determination is performed by comparing each of the sounds obtained by the four external sound microphones 111 and the sound obtained by one internal sound microphone 112 through frequency analysis, as described above. If at least one of the sounds acquired by the four external sound microphones 111 has a similar frequency component to the sound acquired by the internal sound microphone 112, the acquisition control is performed. The unit 113 determines that the similarity between the sounds inside and outside the moving object 1 is high. On the other hand, when there is no one in which the ratio of the similar frequency components exceeds the predetermined ratio, the acquisition control unit 113 determines that the similarity of the sounds inside and outside the moving object 1 is low.

  When it is determined that the similarity between the sounds inside and outside the moving object 1 is high (Yes determination in step S101), the reproducing unit 120 executes the reproducing process (step S103), and the notifying unit 130 executes the notifying process (step S103). Step S104). In the reproduction step (step S103), an external sound transmitted as sound data from the acquisition control unit 113 is reproduced from a speaker arranged at an arbitrary position inside the moving body 1. In the notification step (step S104), the driver is notified via the display screen 131 shown in FIG. 2 that the reproduced sound is the external sound together with the position where the highly similar sound is generated. .

  On the other hand, when it is determined that the similarity between the sounds inside and outside the moving body 1 is low (No in Step S101), only the reproducing process by the reproducing unit 120 is executed (Step S105).

  When the notification in step S104 and the reproduction in step S105 are completed, the process returns to the sound acquisition process in step S101, and the subsequent processes are repeated.

  The processing of the sound reproducing method represented by the flowchart of FIG. 3 is continuously executed until the power of the computer on which the control unit of the sound reproducing apparatus 100 is built is turned off.

  A sound reproducing program for causing a computer to execute the sound reproducing method represented by the flowchart of FIG. 3 is stored in a storage medium of any computer mounted on the moving object. Further, the storage medium for storing the sound reproduction program is not limited to such a storage medium of a computer, and may be a known portable storage medium or a storage medium installed in a server connected to these devices via a network. It may be.

  According to the sound reproducing device 100, the sound reproducing method, the sound reproducing program, and the storage medium of the first embodiment described above, the driver can hear the reproduced sound by the notification performed separately from the reproduction of the external sound. It can recognize that it is an external sound. Thereby, the sound outside the moving object 1 can be reproduced as it is while the driver can distinguish it from the sound inside the moving body 1.

  Here, in the present embodiment, the notification unit 130 is an indicator for visually notifying that the reproduced sound is an external sound. Thus, since the notification is performed in a manner that appeals to the driver's visual perception, it is possible to reproduce the external sound in a state where the driver can easily distinguish it from the internal sound.

  In this embodiment, the notification unit 130 notifies that the reproduced sound is an external sound together with the position where the external sound is generated. Thereby, the driver's attention can be guided to the person where the external sound is generated, so that the driver's recognizability of the external situation can be improved.

  Further, in the present embodiment, the notification unit 130 notifies according to the degree of similarity between the external sound and the internal sound. As a result, it is possible to prevent the driver from being distracted due to too frequent notification, and to notify the driver when the necessity of notification is high, and to pay attention to the external sound effectively. Can be encouraged.

  Next, a second embodiment will be described. The second embodiment will be described focusing on the differences from the first embodiment.

  FIG. 4 is a schematic block diagram showing a sound reproducing device according to a second embodiment mounted on a moving body. In FIG. 4, the same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description of the same components will not be repeated below. I do.

  In the present embodiment, when the sound inside the moving object 1 is acquired by the internal sound microphone 112 of the sound acquisition unit 210, the acquisition control unit determines whether the sound includes a predetermined cautionary sound. It is determined at 202. Here, as a sound requiring attention, as a sound of a child, a sound of a bicycle, a sound of an emergency vehicle, or the like, a sound to which the driver should pay attention, together with a determination standard such as a frequency range characteristic of each sound. A defined sound. The cautionary sound is stored in a memory or the like (not shown) in which the name and the criterion are associated with each other. The acquisition control unit 202 compares the acquired internal sound with each of the cautionary sound determination criteria to determine whether or not the cautionary sound is included in the sound. When the cautionary sound is included in the acquired sound inside the moving body 1, information on the sound is stored in the internal sound storage unit 201 by the acquisition control unit 202. Here, in the present embodiment, the start time of the acquisition of the internal sound is set to the start time of the engine of the moving body 1. In addition, the end time of the acquisition of the internal sound is set to the engine stop time of the moving body 1, and the internal sound storage unit 201 stores information on the internal sound acquired from the engine start time to the engine stop time. Is accumulated.

  It should be noted that the information about the sound here may be sound data representing the sound itself, or may be a name of a cautionary sound included in the sound (for example, a child's voice or the like).

  The time at which the acquisition of the internal sound is started is not limited to the time at which the engine is started, and may be, for example, a time arbitrarily set in response to a driver's operation. Similarly, the acquisition end point can be set arbitrarily.

  In the present embodiment, the acquisition control unit 202 also determines whether or not an external sound acquired via the four external sound microphones 111 and the acquisition control unit 202 also includes a cautionary sound.

  When the external sound includes a cautionary sound, the notification unit 203 stores the external sound acquired via the four external sound microphones 111 and the acquisition control unit 202 and the internal sound storage unit 202. Notification is made according to the degree of similarity with the stored internal sound, and further, the degree of similarity with the internal sound acquired at the time of comparison.

  FIG. 5 is a flowchart showing the flow of processing in the sound reproducing method executed by the sound reproducing device shown in FIG.

  The processing represented by this flowchart differs from the first embodiment described above in that the processing is started with the engine start of the moving body 1 as a trigger. When the process is started, first, the external sound obtaining step (step S201) and the internal sound obtaining step (step S202) by the sound obtaining unit 110 are simultaneously executed, and the sound inside and outside the moving body 1 is obtained. Next, it is determined whether an external sound among the acquired sounds includes a cautionary sound (step S203), and it is determined whether an internal sound includes a cautionary sound. (Step S204). When the cautionary sound is included in the internal sound (Yes in step S204), information on the internal sound is stored in the internal sound storage unit 201 (step S205). The internal sound storage unit 201 executes an internal sound acquisition step (step S201), and every time the acquired internal sound includes a cautionary sound, information on the internal sound is stored in a process represented by this flowchart. Is stored and accumulated until it is terminated by engine stop.

  If the cautionary sound is not included in the internal sound (No in step S204), the process returns, and the internal sound acquiring step (step S202) and the cautionary sound determination (step S204) are repeated. Also, when the external sound does not include the cautionary sound (No determination in step S203), similarly, the processing returns to the external sound acquisition step (step S201) and the determination of the cautionary sound (step S203). Is repeated.

  If the external sound includes a cautionary sound (Yes in step S203), the external sound acquired in the external sound acquiring step (step S201) and the internal sound storage unit 201 up to that point are stored in the external sound. The similarity determination with the internal sound in which the information is stored and stored is performed by the acquisition control unit 202 in the same manner as in the first embodiment described above (step S206). Here, the similarity determination is performed by comparing the name of the cautionary sound included in the sound with the name of the cautionary sound included in the external sound when the name of the cautionary sound included in the sound is stored as information on the internal sound. May be performed.

  When it is determined that the similarity with the content stored in the internal sound storage unit 201 is high (Yes determination in step S206), the reproduction process by the reproduction unit 120 is performed (step S103), and the notification process by the notification unit 130 is performed. (Step S104). On the other hand, when it is determined that the similarity with the content stored in the internal sound storage unit 201 is low (No determination in step S206), the internal sound acquired at the time when the external sound is acquired in step S201 and the internal sound acquired in step S201. Is determined by the acquisition control unit 202 (step S207). The similarity determination here may be a method of comparing sounds similarly to the first embodiment, and after determining whether the internal sound at the time of comparison includes a cautionary sound or not. Alternatively, it may be performed by comparing the names of the cautionary sounds of the inside and outside sounds. When it is determined that the similarity is low also in the similarity determination (No determination in step S207), only the reproducing process by the reproducing unit 120 is executed (step S105). On the other hand, when it is determined that the similarity is high in the similarity determination (Yes determination in step S207), the reproduction process in step S103 and the notification process in step S104 are performed.

  When the notification in step S104 and the reproduction in step S105 are completed, the processing returns to the external sound acquisition step in step S201 and the internal sound acquisition step in step S202, and the subsequent processing is repeated.

  The processing of the sound reproducing method represented by the flowchart of FIG. 4 is continuously executed until the engine of the moving object 1 stops.

  In the second embodiment, a sound reproduction program for causing a computer to execute the sound reproduction method shown in the flowchart of FIG. 5 is stored in a storage medium of any computer mounted on a moving object. Further, the storage medium for storing the sound reproduction program is not limited to such a storage medium of a computer, and may be a known portable storage medium or a storage medium installed in a server connected to these devices via a network. It may be.

  Similarly to the first embodiment, the driver can output the sound outside the moving body 1 by using the sound reproducing device 200, the sound reproducing method, the sound reproducing program, and the storage medium of the second embodiment described above. It can be reproduced as it is while being distinguishable from the internal sound.

  In the present embodiment, information on the internal sound acquired from the engine start time, which is the acquisition start time, is stored in the internal sound storage unit 201. Then, the notifying unit 203 notifies according to the degree of similarity between the external sound and the stored internal sound.

  When a sound source (child CH2 in the example of FIG. 4) similar to the external sound is present inside the moving body 1, the sound of the source is acquired at the same timing as the external sound is acquired. Not necessarily. According to the present embodiment, information on the sound of such a source is stored including the sound emitted in the past. Then, the notifying unit 203 notifies according to the degree of similarity between the stored sound and the external sound. Thus, even when the source of the similar sound does not emit a sound internally when the external sound is acquired, the driver can be notified and the external sound can be effectively alerted.

  It should be noted that the present invention is not limited to the embodiments described above, but includes other configurations and the like that can achieve the object of the present invention, and the following modifications and the like are also included in the present invention.

  For example, in the above-described first and second embodiments, the moving body 1 as a passenger car is illustrated. However, the moving object is not limited to a passenger car, but may be a motorcycle, a large vehicle such as a truck or a bus, and does not matter the specific type of the moving object.

Reference Signs List 1 moving body 100, 200 sound reproducing device 110 sound acquisition unit 111 external sound microphone 112 internal sound microphone 113, 202 sound acquisition control unit 120 reproduction unit 130, 203 notification unit 131 display screen 131a moving object image 131b lighting image 201 internal sound storage Part CH1, CH2 children

Claims (8)

A sound acquisition unit for acquiring sound outside the moving object;
A reproduction unit that reproduces the external sound acquired by the sound acquisition unit inside the moving object,
Notifying unit that notifies the driver of the mobile body that the sound reproduced by the reproducing unit is the external sound,
A sound reproducing device comprising:   The sound reproducing device according to claim 1, wherein the notifying unit is an indicator for visually notifying that the reproduced sound is the external sound.   The sound reproducing device according to claim 1, wherein the notifying unit notifies that the reproduced sound is the external sound, together with a position or an area where the external sound is generated. An internal sound acquisition unit that acquires a sound inside the moving body,
The sound reproducing device according to any one of claims 1 to 3, wherein the notifying unit notifies based on a degree of similarity between the external sound and the internal sound. An internal sound storage unit that stores information about the internal sound that has been acquired from a predetermined acquisition start time in the internal sound acquisition unit,
5. The sound reproducing apparatus according to claim 4, wherein the notifying unit further notifies according to a degree of similarity between the external sound and the internal sound stored in the internal sound storage unit. A sound acquisition step of acquiring a sound outside the moving body,
A reproducing step of reproducing the external sound obtained in the sound obtaining step inside the moving body,
A notification step of notifying the driver of the moving body that the reproduction sound in the reproduction step is the external sound,
A sound reproducing method comprising:   A sound reproducing program for causing a computer to execute the sound reproducing method according to claim 6.   A storage medium storing the sound reproduction program according to claim 7.

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