Reproduction control device

Abstract

To provide a reproduction control device in which a driver can determine whether a traveling speed is appropriate even when the driver does not know original audio contents.SOLUTION: A reproduction control device 100 comprises a traveling speed acquisition unit 101 for acquiring the traveling speed of a vehicle 50, a legal speed acquisition unit 102 for acquiring the legal speed of a road on which the vehicle 50 travels, and a reproduction control unit 104 for controlling reproduction of audio contents for a driver of the vehicle 50. When the difference between the traveling speed and the legal speed is equal to or greater than a threshold value, the reproduction control unit 104 alternately performs normal reproduction for outputting the audio contents in an original manner and changed reproduction for outputting the audio contents in a changed manner from the original manner.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a playback control device. [Background technology]

[0002] In recent years, various technologies for assisting vehicle driving have been proposed. For example, the technology described in Patent Document 1 discloses a playback device having a speed detection means for detecting the traveling speed of a vehicle and a control means for changing the playback speed of music when the speed detected by the speed detection means exceeds a preset value. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-056312 A Summary of the Invention [Problem to be solved by the invention]

[0004] According to the playback device disclosed in Patent Document 1, the driver of a vehicle can sense whether the vehicle's traveling speed is appropriate by hearing. However, when using the technology disclosed in Patent Document 1, if the driver does not know the original playback speed of the audio content being played back, it is difficult for the driver to judge whether the traveling speed is appropriate.

[0005] Therefore, an object of the present disclosure is to provide a playback control device that enables a driver to determine whether or not the driving speed is appropriate even if the driver is not familiar with the original audio content. [Means for solving the problem]

[0006] A playback control device according to a first aspect includes: A traveling speed acquisition unit that acquires a traveling speed of a vehicle; a legal speed acquisition unit that acquires a legal speed of a road on which the vehicle is traveling; a playback control unit that controls playback of audio content for a driver of the vehicle; having When the difference between the driving speed and the legal speed is equal to or greater than a threshold value, the playback control unit alternates between normal playback, in which the audio content is output in its original form, and changed playback, in which the audio content is output in a form changed from the original form. Effect of the Invention

[0007] According to the present disclosure, it is possible to provide a playback control device that enables a driver to determine whether or not the driving speed is appropriate even if the driver is not familiar with the original audio content. [Brief description of the drawings]

[0008] [Figure 1] 1 is a block diagram showing an example of a configuration of a playback system according to an embodiment; [Diagram 2] 5 is a flowchart showing an example of an operation flow of the playback control device according to the embodiment. [Diagram 3] FIG. 2 is a block diagram showing the configuration of a computer that realizes the processing of the playback control device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described with reference to the drawings. In order to clarify the description, the following description and drawings are omitted and simplified as appropriate. In each drawing, the same elements are given the same reference numerals, and duplicated descriptions are omitted as necessary. In addition, the execution order of the processes shown in the flowchart or sequence chart is merely an example, and the execution order can be appropriately changed as long as no technical contradiction occurs. In addition, the features of each embodiment can be combined as long as no technical contradiction occurs.

[0010] 1 is a block diagram showing an example of a configuration of a playback system 10 according to an embodiment. The playback system 10 is a system that outputs audio content to a driver of a vehicle 50, thereby notifying the driver or a passenger of whether the traveling speed of the vehicle 50 is appropriate by hearing the driver or a passenger. The playback system 10 includes a playback control device 100, a sensor device 200, and a speaker 300. The vehicle 50 is, for example, an automobile that runs on four or more wheels, but may also be a motorcycle or the like.

[0011] The sensor device 200 is a group of devices that perform sensing to obtain information necessary for processing by the reproduction control device 100. The sensor device 200 is provided in the vehicle 50, for example, but may be carried by the driver or a passenger of the vehicle 50. The sensor device 200 may include a plurality of sensor devices, or may include a plurality of types of sensor devices. The sensor device 200 may include a vehicle speed sensor or an acceleration sensor for detecting the speed of the vehicle 50, or may include a GNSS (Global Navigation Satellite System) sensor. The sensor device 200 may also include a camera that captures the periphery of the vehicle 50 in order to identify the legal speed of the road on which the vehicle 50 runs from road signs or road markings provided on the road. The sensor device 200 may also include a GNSS sensor in order to identify the legal speed of the road on which the vehicle 50 runs from map information and the current location of the vehicle 50. The sensor device 200 may also include a camera that captures images of the periphery of the vehicle 50 in order to identify environmental information representing the driving environment of the vehicle 50 from an image captured around the vehicle 50. The sensor device 200 may also include a GNSS sensor in order to identify the environmental information from map information and the current location of the vehicle 50. Note that these are merely examples of the sensor device 200, and other known devices may also be used as the sensor device 200 in order to obtain information necessary for processing by the reproduction control device 100.

[0012] The speaker 300 is a speaker that outputs the sound of the audio content under the control of the playback control device 100. The speaker 300 outputs the sound to the driver or passengers of the vehicle 50.

[0013] 1, the regeneration control device 100 includes a driving speed acquisition unit 101, a legal speed acquisition unit 102, an environmental information acquisition unit 103, and a regeneration control unit 104. In this embodiment, the regeneration control device 100 is mounted on a vehicle 50, but may be carried by a driver or a passenger of the vehicle 50, or a part or all of the configuration of the regeneration control device 100 may be included in an external device of the vehicle 50, such as a server connected to a network via a communication unit (not shown).

[0014] The traveling speed acquisition unit 101 acquires the traveling speed of the vehicle 50. In this embodiment, the traveling speed acquisition unit 101 acquires the traveling speed using the sensing result of the sensor device 200. For example, the traveling speed acquisition unit 101 may acquire the current speed of the vehicle 50 by receiving a signal output from a vehicle speed sensor, or may acquire the current speed of the vehicle 50 by calculating the speed from a signal output from an acceleration sensor. In addition, the traveling speed acquisition unit 101 may acquire the current speed of the vehicle 50 from a temporal change in the position data of the vehicle 50 output from the GNSS. Note that the traveling speed acquisition unit 101 may acquire the current speed of the vehicle 50 by other known methods. For example, the traveling speed acquisition unit 101 may specify the speed by analyzing an image from a camera that captures the periphery of the vehicle 50, or may acquire the current speed of the vehicle 50 via a CAN (Controller Area Network) of the vehicle 50. Note that these are merely examples of a method of acquiring the traveling speed, and the traveling speed acquisition unit 101 may acquire the traveling speed using other known techniques.

[0015] The legal speed acquisition unit 102 acquires the legal speed of the road on which the vehicle 50 is traveling. The legal speed is also called the speed limit. In this embodiment, the legal speed acquisition unit 102 acquires the legal speed of the road on which the vehicle 50 is currently traveling, using the sensing result of the sensor device 200. For example, the legal speed acquisition unit 102 may acquire the legal speed by recognizing a road sign or a road marking from an image captured by a camera that captures the periphery of the vehicle 50 by image recognition processing. In addition, the legal speed acquisition unit 102 may acquire the legal speed of the road on which the vehicle 50 is currently traveling, from map information including information on the legal speed for each road and the current location of the vehicle 50 identified by the GNSS sensor. Note that these are merely examples of a method for acquiring the legal speed, and the legal speed acquisition unit 102 may acquire the legal speed using other known techniques.

[0016] The environmental information acquisition unit 103 acquires environmental information that represents the driving environment of the vehicle 50. The environmental information is used to determine whether or not an exclusion condition for suppressing the implementation of the change reproduction described later is satisfied. In this embodiment, when a predetermined exclusion condition is satisfied, even if the driving speed of the vehicle 50 deviates from the legal speed, the reproduction control device 100 does not inform the driver of the deviation between the legal speed and the driving speed. Specifically, the environmental information acquisition unit 103 acquires, as the environmental information, the congestion degree of the road on which the vehicle 50 is traveling. In addition, the environmental information acquisition unit 103 acquires, as the environmental information, information indicating whether or not the vehicle 50 is traveling in a lane other than the passing lane on a road having a passing lane. In addition, the environmental information acquisition unit 103 acquires, as the environmental information, information indicating whether or not the vehicle 50 is traveling in the climbing lane on a road having a climbing lane. Note that the environmental information acquisition unit 103 may acquire any one of these environmental information, any two of them, or all of them.

[0017] In this embodiment, the environmental information acquisition unit 103 acquires environmental information by using the sensing result of the sensor device 200. For example, the environmental information acquisition unit 103 may acquire the congestion degree of a road by recognizing the number of other vehicles traveling around the vehicle 50 from an image captured by a camera capturing an image of the periphery of the vehicle 50 through image recognition processing. Specifically, the congestion degree may be expressed as the number of vehicles within a predetermined range from the vehicle 50. In other words, the congestion degree may be expressed as the density of vehicles on the road.

[0018] Also, for example, the environmental information acquisition unit 103 may determine whether or not the road on which the vehicle 50 is currently traveling has an overtaking lane by recognizing a road sign or a road marking from an image captured by a camera that captures the periphery of the vehicle 50 through image recognition processing. Also, for example, the environmental information acquisition unit 103 may determine whether or not the road on which the vehicle 50 is currently traveling has an overtaking lane from map information including information indicating whether or not the road has an overtaking lane and the current location of the vehicle 50 identified by the GNSS sensor. Then, the environmental information acquisition unit 103 may determine whether the lane on which the vehicle 50 is currently traveling is an overtaking lane or a lane other than the overtaking lane by recognizing the lane on which the vehicle 50 is traveling from an image captured by a camera that captures the periphery of the vehicle 50.

[0019] Similarly, the environmental information acquisition unit 103 may determine whether or not the road on which the vehicle 50 is currently traveling has a climbing lane by recognizing a road sign or a road marking from an image captured by a camera that captures the periphery of the vehicle 50 through image recognition processing. Also, for example, the environmental information acquisition unit 103 may determine whether or not the road on which the vehicle 50 is currently traveling has a climbing lane from map information including information indicating whether or not the road has a climbing lane and the current location of the vehicle 50 identified by the GNSS sensor. Then, the environmental information acquisition unit 103 may determine whether the lane on which the vehicle 50 is currently traveling is a climbing lane or a lane other than a climbing lane by recognizing the lane on which the vehicle 50 is traveling from an image captured by a camera that captures the periphery of the vehicle 50.

[0020] Note that these are merely examples of methods for acquiring environmental information, and the environmental information acquiring unit 103 may acquire environmental information using other known techniques.

[0021] The playback control unit 104 controls the playback of audio content output from the speaker 300 for the driver of the vehicle 50. The audio content may be audio data of music or video recorded on a CD (Compact Disc), a DVD (Digital Versatile Disc), a Blu-ray (registered trademark) disc, a memory card, or the like, or may be audio data of music or video streamed from a server connected to a network via a communication unit (not shown). The playback control unit 104 may obtain the audio content via an audio device mounted on the vehicle 50, or via a device carried by the driver, such as a smartphone.

[0022] The playback control unit 104 outputs to the speaker 300 an audio signal of an audio content designated by the driver or a passenger of the vehicle 50 or an audio signal of a predetermined audio content.

[0023] In particular, in this embodiment, when the difference between the traveling speed acquired by the traveling speed acquisition unit 101 and the legal speed acquired by the legal speed acquisition unit 102 is equal to or greater than a predetermined threshold, the playback control unit 104 controls the playback of the audio content so as to alternate between normal playback and variable playback of the audio content. That is, in this case, the playback control unit 104 repeats a process of playing back the continuation of the audio content that was played partway through in normal playback in variable playback, and a process of playing back the continuation of the audio content that was played partway through in variable playback in normal playback. Also, when the difference between the traveling speed acquired by the traveling speed acquisition unit 101 and the legal speed acquired by the legal speed acquisition unit 102 is less than the threshold, the playback control unit 104 does not perform variable playback, but only performs normal playback of the audio content. The above-mentioned threshold may differ depending on the type of road. For example, the threshold may differ depending on whether the road on which the vehicle 50 is traveling is an expressway or an ordinary road. As an example, when the road on which the vehicle 50 is traveling is an expressway, a speed of 20 kilometers per hour is used as the threshold value described above, and when the road is an ordinary road, a speed of 5 kilometers per hour is used as the threshold value described above. However, these values ​​for the threshold value are merely examples, and other values ​​may be used. For example, the higher the legal speed limit of the road on which the vehicle 50 is traveling, the higher the value set as the threshold value described above. In this way, control can be performed according to the road on which the vehicle 50 is traveling.

[0024] Here, normal playback refers to a playback method that outputs audio content in its original form. That is, in normal playback, audio content is played back in its original state. In other words, in normal playback, the original audio content is played back. In other words, in normal playback, playback is performed without any changes being made to the original audio content. Moreover, modified playback refers to a playback method that outputs audio content in a form that has been modified from its original form. That is, in modified playback, audio content is played back in a state different from its original state. In other words, in modified playback, changes are made to the original audio content and playback is performed.

[0025] In the variable playback, any change may be made to the audio content, and then the audio content may be played back. Such a change may be, for example, a change in the tempo of the audio content. That is, in the variable playback, the audio content may be played back at a playback speed different from the original playback speed. In the variable playback, for example, when the speed of the vehicle 50 is faster than the legal speed, the audio content is played back at a tempo faster than normal, and when the speed of the vehicle 50 is slower than the legal speed, the audio content is played back at a tempo slower than normal. In this way, it is possible to easily understand intuitively whether the current traveling speed of the vehicle 50 is faster or slower than the legal speed. However, in the variable playback, when the speed of the vehicle 50 is faster than the legal speed, the audio content may be played back at a tempo slower than normal, and when the speed of the vehicle 50 is slower than the legal speed, the audio content may be played back at a tempo faster than normal. In order to make it easier for the driver to recognize the difference between the normal playback and the variable playback, it is preferable that the original audio content be an audio content whose tempo does not change. In particular, it is preferable that the original audio content is not a piece of music whose tempo changes every few bars.

[0026] Moreover, the change to the audio content in the variation playback may be a change in the pitch of the audio content. That is, in the variation playback, the audio content may be played at a pitch different from the original pitch of the audio content. In other words, in the variation playback, the original audio content may be transposed and played. In the variation playback, for example, when the speed of the vehicle 50 is faster than the legal speed, the audio content is played at a higher pitch than normal, and when the speed of the vehicle 50 is slower than the legal speed, the audio content is played at a lower pitch than normal. In this way, it is possible to easily understand intuitively whether the current traveling speed of the vehicle 50 is faster or slower than the legal speed. However, in the variation playback, when the speed of the vehicle 50 is faster than the legal speed, the audio content may be played at a lower pitch than normal, and when the speed of the vehicle 50 is slower than the legal speed, the audio content may be played at a higher pitch than normal.

[0027] Also, the greater the difference between the legal speed and the running speed, the greater the change amount of the varied playback compared to the normal playback. For example, in the varied playback, the audio content may be played back at a slower tempo or a lower pitch the slower the running speed is than the legal speed. Similarly, for example, in the varied playback, the audio content may be played back at a faster tempo or a higher pitch the faster the running speed is than the legal speed. This makes it easier to intuitively understand the amount of deviation between the legal speed and the running speed. Also, in the varied playback, both the tempo and the pitch may be changed.

[0028] The duration of the varied playback may be longer than the duration of the normal playback, which increases the time during which the varied playback gives the driver a sense of discomfort, making it easier for the driver to recognize that the driving speed of the vehicle 50 is different from the legal speed limit.

[0029] Furthermore, the playback control unit 104 may change the length of the period during which the variation playback continues depending on the magnitude of the difference between the traveling speed of the vehicle 50 and the legal speed. For example, the length of the period during which the variation playback continues may be lengthened as the difference between the traveling speed of the vehicle 50 and the legal speed increases. This makes it easier to intuitively understand the amount of deviation between the legal speed and the traveling speed.

[0030] Furthermore, in this embodiment, when a predetermined exclusion condition is satisfied, the playback control unit 104 performs only normal playback, regardless of whether the difference between the traveling speed of the vehicle 50 and the legal speed is equal to or greater than a threshold. That is, in this case, the playback control unit 104 does not perform variation playback. This makes it possible to refrain from notifying the driver of the difference between the legal speed and the speed of the vehicle 50 in a situation where it is not a problem if the vehicle 50 is traveling at a speed slower than the legal speed, that is, in a situation where there is no need to prompt the driver to increase the speed of the vehicle 50. That is, it is possible to refrain from bothering the driver with unnecessary notifications.

[0031] Specifically, the playback control unit 104 alternates between normal playback and modified playback when the difference between the traveling speed of the vehicle 50 and the legal speed is equal to or greater than a threshold value and the traveling environment of the vehicle 50 represented in the environmental information acquired by the environmental information acquisition unit 103 does not meet a predetermined condition. Then, when the traveling environment of the vehicle 50 represented in the environmental information acquired by the environmental information acquisition unit 103 meets a predetermined condition, the playback control unit 104 performs only normal playback regardless of the difference between the traveling speed of the vehicle 50 and the legal speed.

[0032] For example, when the difference between the traveling speed of the vehicle 50 and the legal speed is equal to or greater than a predetermined first threshold and the traveling speed is slower than the legal speed, the reproduction control unit 104 controls the reproduction of the audio content as follows. In this case, when the congestion degree acquired as the environmental information is less than a predetermined second threshold, the reproduction control unit 104 alternates between normal reproduction and variable reproduction. That is, when the congestion degree is not equal to or greater than the second threshold, normal reproduction and variable reproduction are alternately performed. Also, in the above-mentioned case, when the congestion degree is equal to or greater than the second threshold, the reproduction control unit 104 performs only normal reproduction. When the road is congested due to traffic jams, it is unavoidable that the traveling speed of the vehicle 50 is slower than the legal speed. Therefore, in this case, in a situation where there is no need to prompt the driver to increase the speed of the vehicle 50, it is possible to refrain from notifying the driver of the difference between the legal speed and the speed of the vehicle 50.

[0033] Also, for example, when the difference between the traveling speed of the vehicle 50 and the legal speed is equal to or greater than a predetermined threshold and the traveling speed is slower than the legal speed, the playback control unit 104 controls the playback of the audio content as follows. In this case, when the vehicle 50 is traveling in a passing lane on a road having a passing lane, the playback control unit 104 alternates between normal playback and variable playback. That is, when the vehicle 50 is not traveling in a lane other than the passing lane, normal playback and variable playback are alternated. Also, in the above-mentioned case, when the vehicle 50 is traveling in a lane other than the passing lane on the road, the playback control unit 104 performs only normal playback. When the vehicle 50 is traveling in a lane other than the passing lane on a road having a passing lane, even if the traveling speed of the vehicle 50 is slower than the legal speed, it does not hinder the smooth traveling of other vehicles. Therefore, in this case, in a situation where there is no need to prompt the driver to increase the speed of the vehicle 50, it is possible to refrain from notifying the driver of the difference between the legal speed and the speed of the vehicle 50.

[0034] Also, for example, when the difference between the vehicle 50 traveling speed and the legal speed is equal to or greater than a predetermined threshold and the traveling speed is slower than the legal speed, the playback control unit 104 controls the playback of the audio content as follows. In this case, when the vehicle 50 is traveling on a lane other than the climbing lane on a road having a climbing lane, the playback control unit 104 alternates between normal playback and variable playback. That is, when the vehicle 50 is not traveling on the climbing lane, normal playback and variable playback are alternately performed. Also, in the above-mentioned case, when the vehicle 50 is traveling on the climbing lane on the road, only normal playback is performed. When the vehicle 50 is traveling on the climbing lane on a road having a climbing lane, even if the traveling speed of the vehicle 50 is slower than the legal speed, it does not hinder the smooth traveling of other vehicles. Therefore, in this case, in a situation where there is no need to prompt the driver to increase the speed of the vehicle 50, it is possible to refrain from notifying the driver of the difference between the legal speed and the speed of the vehicle 50.

[0035] Next, a flow of audio content playback control performed by the playback control device 100 according to the present embodiment will be described. Fig. 2 is a flowchart showing an example of an operation flow of the playback control device 100. Below, the operation flow of the playback control device 100 will be described with reference to Fig. 2.

[0036] In step S100, the traveling speed acquisition unit 101 acquires the traveling speed of the vehicle 50. Next, in step S101, the legal speed acquisition unit 102 acquires the legal speed of the road on which the vehicle 50 travels. Next, in step S102, the environmental information acquisition unit 103 acquires environmental information that represents the traveling environment of the vehicle 50. Note that steps S100, S101, and S102 may be performed in an order different from that shown in the flowchart in FIG. 2, or may be performed in parallel.

[0037] After the processes of steps S100 to S102, in step S103, the reproduction control unit 104 judges whether or not the difference between the driving speed acquired in step S100 and the legal speed acquired in step S101 is equal to or greater than a predetermined threshold value. If the difference between the two is equal to or greater than the threshold value, the process proceeds to step S104, and if the difference between the two is less than the threshold value, the process proceeds to step S106.

[0038] In step S104, the playback control unit 104 judges whether the driving environment indicated in the environmental information acquired in step S102 satisfies a predetermined exclusion condition. For example, the playback control unit 104 judges whether the congestion degree of the road is equal to or higher than a threshold. Alternatively, the playback control unit 104 judges whether the vehicle 50 is driving in a lane other than an overtaking lane on a road having an overtaking lane. Alternatively, the playback control unit 104 judges whether the vehicle 50 is driving in the climbing lane on a road having an uphill lane. If the driving environment of the vehicle 50 does not satisfy the predetermined exclusion condition, the process proceeds to step S105, and if the driving environment of the vehicle 50 satisfies the predetermined exclusion condition, the process proceeds to step S106.

[0039] In step S105, the playback control unit 104 alternates between normal playback and modified playback of the audio content. That is, the playback control unit 104 alternates between performing normal playback of the audio content for a period of a first length and performing modified playback of the audio content for a period of a second length. In contrast, in step S106, the playback control unit 104 performs only normal playback. When a predetermined determination period has elapsed since the process proceeded to step S105 or step S106, the process returns to step S100, and the above-mentioned process is performed again.

[0040] In this embodiment, as described above, when the difference between the traveling speed of the vehicle 50 and the legal speed is equal to or greater than the threshold, the process proceeds to step S104, but step S104 may be omitted and the process proceeds to step S105. In other words, the control of regeneration using the exclusion condition may not be performed.

[0041] The embodiment has been described above. In this embodiment, normal reproduction and modified reproduction are alternately performed. Therefore, the driver can compare the audio content reproduced in normal reproduction with the audio content reproduced in modified reproduction, so that even if the driver does not know the original audio content, the driver can easily notice that the original audio content is being modified and then reproduced. Therefore, even if the driver does not know the tempo or pitch of the original audio content, the driver can determine whether the traveling speed of the vehicle 50 is appropriate.

[0042] The above-mentioned functions (processing) of the playback control device 100 may be realized by a computer 500 having the following configuration, for example.

[0043] 3 is a block diagram showing a configuration of a computer 500 that realizes the processing of the playback control device 100. As shown in FIG.

[0044] The input / output interface 501 is used to communicate with other devices such as the sensor device 200 and the speaker 300 .

[0045] The memory 502 is configured, for example, by a combination of a volatile memory and a non-volatile memory, and is used to store programs executed by the processor 503, data used in processing, and the like.

[0046] The processor 503 reads out and executes a program from the memory 502 to perform processing of the playback control device 100. The processor 503 may be, for example, a microprocessor, a microprocessor unit (MPU), or a central processing unit (CPU). The processor 503 may include multiple processors.

[0047] The program includes instructions (or software code) that, when loaded into a computer, cause the computer to perform one or more functions described in the embodiments. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray disc or other optical disk storage. The program may be transmitted on a transitory computer-readable medium or communication medium. By way of example and not limitation, the transitory computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagated signals.

[0048] Although the embodiment has been described above, the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit and scope of the present invention.

[0049] A part or all of the above-described embodiments can be described as, but is not limited to, the following supplementary notes. (Appendix 1) A traveling speed acquisition unit that acquires a traveling speed of a vehicle; a legal speed acquisition unit that acquires a legal speed of a road on which the vehicle is traveling; a playback control unit that controls playback of audio content for a driver of the vehicle; having When the difference between the driving speed and the legal speed limit is equal to or greater than a threshold value, the reproduction control unit alternately performs normal reproduction, in which the audio content is output in an original mode, and modified reproduction, in which the audio content is output in a mode modified from the original mode. Playback control device. (Appendix 2) The length of the period during which the altered playback continues is longer than the length of the period during which the normal playback continues. 2. A playback control device as described in appendix 1. (Appendix 3) The reproduction control unit changes the length of the period during which the variation reproduction continues depending on the magnitude of the difference between the driving speed and the legal speed limit. 3. A playback control device according to claim 1 or 2. (Appendix 4) An environmental information acquisition unit that acquires environmental information representing a driving environment of the vehicle, The reproduction control unit alternately performs the normal reproduction and the variable reproduction when the difference between the driving speed and the legal speed is equal to or greater than a threshold value and the driving environment represented in the environmental information does not meet a predetermined condition. 4. A playback control device according to claim 1, (Appendix 5) The environmental information indicates at least one of a degree of congestion of a road on which the vehicle is traveling, whether or not the vehicle is traveling in a lane other than an overtaking lane on a road having an overtaking lane, and whether or not the vehicle is traveling in a climbing lane on a road having an overtaking lane. 5. A playback control device according to claim 4. (Appendix 6) Obtain the vehicle's traveling speed; Obtaining the legal speed limit of the road on which the vehicle is traveling; Controlling the playback of audio content for a driver of the vehicle; In the control of the reproduction, when the difference between the driving speed and the legal speed is equal to or greater than a threshold value, normal reproduction in which the audio content is output in an original manner and modified reproduction in which the audio content is output in a manner modified from the original manner are alternately performed. Playback control method. (Appendix 7) A travel speed acquisition step of acquiring a travel speed of a vehicle; a legal speed acquisition step of acquiring a legal speed of a road on which the vehicle is traveling; a playback control step of controlling playback of audio content for a driver of the vehicle; Run the following on your computer: In the reproduction control step, when the difference between the driving speed and the legal speed is equal to or greater than a threshold value, normal reproduction in which the audio content is output in an original mode and modified reproduction in which the audio content is output in a mode modified from the original mode are alternately performed. program. [Explanation of symbols]

[0050] 10 Playback System 50 vehicles 100 Playback control device 101 Travel speed acquisition unit 102 Legal speed acquisition department 103 Environmental Information Acquisition Department 104 Playback control section 200 Sensor device 300 speakers 500 Computers 501 Input / Output Interface 502 Memory 503 Processor

Claims

1. A traveling speed acquisition unit that acquires a traveling speed of a vehicle; a legal speed acquisition unit that acquires a legal speed of a road on which the vehicle is traveling; a playback control unit that controls playback of audio content for a driver of the vehicle; having When the difference between the driving speed and the legal speed limit is equal to or greater than a threshold value, the reproduction control unit alternately performs normal reproduction, in which the audio content is output in an original mode, and modified reproduction, in which the audio content is output in a mode modified from the original mode. Playback control device.

2. The length of the period during which the altered playback continues is longer than the length of the period during which the normal playback continues. The playback control device according to claim 1 .

3. The reproduction control unit changes the length of the period during which the variation reproduction continues depending on the magnitude of the difference between the driving speed and the legal speed limit. The playback control device according to claim 1 or 2.

4. An environmental information acquisition unit that acquires environmental information representing a driving environment of the vehicle, The reproduction control unit alternately performs the normal reproduction and the variable reproduction when the difference between the driving speed and the legal speed is equal to or greater than a threshold value and the driving environment represented in the environmental information does not meet a predetermined condition. The playback control device according to claim 1 .

5. The environmental information indicates at least one of a degree of congestion of a road on which the vehicle is traveling, whether or not the vehicle is traveling in a lane other than an overtaking lane on a road having an overtaking lane, and whether or not the vehicle is traveling in a climbing lane on a road having an overtaking lane. The playback control device according to claim 4.

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