JP7407046B2 - Audio output control method and audio output control device - Google Patents

Description

The present invention relates to an audio output control method and an audio output control device.

2. Description of the Related Art Conventionally, in-vehicle devices have been known that play music or the like in response to user instructions and provide various types of information requested by the user via voice. For example, when a user issues a voice instruction to the in-vehicle device, such as "Tell me today's top news" following a so-called wake-up word indicating the start of a voice instruction, the in-vehicle device connects to a news server on the Internet. Search and start reading top news.

If the user wants to stop these audio outputs midway for some reason, he or she can do so, for example, by giving a voice command, and then, if necessary, give a new voice command to start the desired sound again. Output can be directed.

However, there are various factors that cause the user to stop audio output, and depending on the factor, instead of completely ending audio output, it may be possible to temporarily stop (i.e. interrupt) the audio output, and after the cause is gone, the audio output will start. There may be cases where it is desirable for output to be resumed.

For example, when a relatively long piece of news is read aloud and output as audio, the reading will be interrupted rather than terminated by a stop instruction from the user, and after the cause of the stop instruction has been eliminated, the It may be preferable for the user to resume the reading from the interrupted point, since there is no need to listen to the same news portion repeatedly.

Further, such appropriate restart of audio output is also desirable in audio dialogue with the user performed by the dialogue device. In particular, in voice dialogue where a single user instruction is given through multiple dialogues, if the dialogue is restarted under appropriate conditions after the user gives an instruction to stop the dialogue, the user's command can be given through efficient dialogue. can be given.

Therefore, when the user stops audio output, it would be convenient for the user if the stopped audio output was restarted at an appropriate timing or under appropriate conditions depending on the cause of the stop. In this case, since the audio output that the user once instructed to stop will be restarted without any instruction from the user, it is considered necessary to ensure that the user is satisfied with the restart. That is, it is desired to realize a technology that can restart the stopped audio output while ensuring the user's satisfaction when the user stops audio output.

As a prior art, Patent Document 1 discloses that an in-vehicle dialogue device that interacts with the driver does not speak to the driver when the driver's driving load is high, and does not speak to the driver when the driving load is low and the driver is absentminded ( It is disclosed that the driver starts speaking when the driver is in a state of decreased attention (such as when the driving operation is slow or a large corrective operation is performed). Furthermore, Patent Document 2 discloses that an in-vehicle voice dialogue device accepts voice from the driver when the driver's driving margin, as determined from signals from a brake sensor, etc., is at a level where the voice message can be recognized. This is disclosed.

However, these conventional technologies determine whether to output speech to the driver or to receive speech from the driver depending on the driving load, and do not require the user to issue an instruction to stop audio output as described above. It does not provide any solutions for improving user convenience in the actual situation.

Japanese Patent Application Publication No. 2017-067849 Japanese Patent Application Publication No. 2018-063338

Given the above background, there is a need for a technology that can resume audio output that has been stopped by the user while ensuring the user's satisfaction.

One aspect of the present invention is a method for controlling audio output, wherein the stop instruction unit stops the audio output in response to receiving an instruction to stop the audio output from the user during audio output to the user. a step of causing the user to issue the stop instruction in response to receiving the stop instruction, a factor estimation unit estimating the cause of the stop instruction; and a step of notifying the user when restarting the stopped audio output. and a step of notifying the user according to the estimated factor , the notification including a condition for resuming the audio output depending on the factor estimated in the estimating step .
According to another aspect of the present invention, the notification includes a reason for resuming the audio output according to the estimated factor.
According to another aspect of the present invention, the user includes a driver of a vehicle, and in the step of notifying, when the estimated factor is an increase in the driver's driving load, the user includes an increase in the driving load of the driver. The notification includes the termination of the resulting driving scene as the reason for restarting.
According to another aspect of the present invention, the notification includes an inquiry to the user regarding whether or not the stopped audio output can be resumed.
According to another aspect of the present invention, the user includes a driver of a vehicle, and in the step of notifying, the estimated factor is an increase in the driving load of the driver, and the user includes an increase in the driving load from the stop instruction. The user The notification including a predetermined sign sound is made to the user.
According to another aspect of the present invention, the notification including the predetermined sign sound does not include an inquiry to the user regarding whether or not restart is possible.
Another aspect of the present invention is an audio output control device that controls audio output, wherein the audio output is stopped in response to receiving an instruction to stop audio output from the user during audio output to the user. an instruction unit, a factor estimation unit that estimates a factor why the user gave the stop instruction in response to receiving the stop instruction; , a notification section that provides a notification according to the estimated factor , and the notification includes a condition for resuming the audio output according to the factor estimated by the factor estimating section .

According to the present invention, audio output that has been stopped by the user can be resumed while ensuring the user's satisfaction.

1 is a diagram showing the configuration of a UI control device according to an embodiment of the present invention. FIG. 2 is a flow diagram showing a procedure of control processing in the UI control device shown in FIG. 1. FIG. FIG. 3 is a flow diagram showing the procedure of factor estimation processing in the control processing shown in FIG. 2; FIG. 3 is a flow diagram showing the procedure of condition determination processing in the control processing shown in FIG. 2; FIG. 3 is a flow diagram showing a procedure of notification processing in the control processing shown in FIG. 2;

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a diagram showing the configuration of a user interface control device as an audio output control device according to a first embodiment of the present invention. This user interface control device (hereinafter referred to as UI control device) 100 is mounted on a vehicle 102 that is a moving body. A UI control device 100, which is an audio output control device, connects a camera control device 106, a vehicle information acquisition device 108, a driving scene evaluation device 110, a driving skill evaluation device 112, a user information management device 114, and a driving skill evaluation device 112 via an in-vehicle network bus 104. It is communicably connected to a load calculation device 116, an AV (audio visual) output device 118, and a content providing device 120.

The UI control device 100 uses the AV output device 118 and the content providing device 120 as clients, and provides communication between these client devices and the user via a user interface consisting of a microphone 140, a speaker 142, a display device 144, and a touch panel 146. Mediate the interactions that occurred. In particular, the UI control device 100 controls stopping and restarting audio output from these client devices to the user via the speaker 142.

Note that in the following, a user refers to a user of the vehicle 102 including a driver of the vehicle 102 and a fellow passenger.

The camera control device 106 captures an image of the interior of the vehicle 102 using the interior camera 122 . Furthermore, the camera control device 106 photographs the external environment of the vehicle 102 using, for example, an exterior camera 124 provided on the exterior of the vehicle 102.

Vehicle information acquisition device 108 detects the driving operation and motion state (or dynamic state) of vehicle 102 from sensor group 126 . The sensor group 126 includes sensors that acquire the presence or absence of user operations and the amount of operation on various operating devices related to vehicle operation, such as an accelerator pedal sensor, a brake pedal sensor, a steering sensor, a shift sensor, and a direction indicator sensor. . Additionally, the sensor group 126 may include various sensors that detect the motion state or dynamic state of the vehicle, such as a three-axis acceleration sensor, a yaw rate sensor, and a speed sensor.

The driving scene evaluation device 110 evaluates a driving scene (or traffic scene) that is a traffic environment scene in which the vehicle 102 travels, in accordance with the conventional technology. In this embodiment, the driving scenes are categorized into various traffic scenes encountered when driving a vehicle, such as passing through an intersection, turning right at an intersection, turning left at an intersection, driving oppositely on a narrow road, overtaking the vehicle in front, changing lanes, and highway traffic. It may be expressed as one or a combination of multiple conditions, such as merging, passing emergency vehicles, two-wheeled vehicles running side by side, pedestrian congestion, street congestion, driving during a rainstorm, etc.

The driving scene evaluation device 110 calculates, for each of the above-mentioned driving scenes (candidate scenes), the degree of certainty (likelihood, probability, or reliability) for determining that the driving scene matches the current driving scene. From the calculated reliability of each candidate scene, the candidate scene with the highest reliability can be identified as the current driving scene. Here, the degree of certainty can be expressed as a numerical value in the range of 0 or more and 1 or less, for example, the value increases as the degree of certainty increases.

Specifically, the driving scene evaluation device 110 includes a processing device that is a computer including a processor such as a CPU, and evaluates, for example, the external environment of the vehicle 102, the driving behavior of the driver of the vehicle 102, and/or the driving behavior of the driver of the vehicle 102. The reliability of each driving scene is calculated based on the motion state.

Here, the external environment may include map information near the current location of the vehicle 102 (geometric configurations and lane configurations of roads such as straight ahead, curves, four-way intersections, expressway entrances, etc.), and information obtained from the external camera 124. The information may include the presence of other vehicles, road signs, operating conditions of road equipment (lighting color of traffic lights, etc.), weather conditions, and the like. In addition, the driver's driving behavior includes the driver's line of sight movement (looking at the side mirror or rearview mirror to confirm safety), the type of driving operation (acceleration/deceleration operation, steering operation, turning on the turn signal lights) ), and/or the operation amount, operation order, etc. of these driving operations. Further, the motion state of the vehicle 102 may include speed, acceleration, deceleration, turning speed, road gradient, and the like.

The driving scene evaluation device 110 combines this information with map information stored in its own storage device, vehicle environment information obtained from the vehicle exterior camera 124, driver's line of sight information obtained from the vehicle interior camera 122, and vehicle The information is acquired from various types of vehicle information acquired by the information acquisition device 108.

The driving scene evaluation device 110 evaluates, for example, the external environment, a series of driving actions, and the vehicle motion state characteristic of each candidate scene, the current external environment of the vehicle 102, the driver's driving actions, and the vehicle 102. The degree of certainty can be calculated from the degree of agreement between the two motion states.

However, the method of calculating the confidence level is not limited to the above. For example, the driving scene evaluation device 110 uses a learned model that has been machine learned to probabilistically estimate the current driving scene from the external environment, driving behavior, and/or motion state. , and/or the reliability of each candidate scene corresponding to the driving state may be calculated.

The driving scene evaluation device 110 outputs the confidence level of each of the candidate scenes to other devices via the in-vehicle network bus, and also identifies the candidate scene with the highest confidence level as the current driving scene. Output the results to other devices.

Driving skill evaluation device 112 evaluates the driving skill of the driver of vehicle 102 according to conventional technology, and stores the evaluation results. Specifically, the driving skill evaluation device 112 includes a processing device, which is a computer including a processor such as a CPU, and a storage device. The driving skill evaluation device 112 compares the standard maneuvering flow performed by a standard driver in a driving scene similar to the current driving scene acquired from the driving scene evaluation device 110 and the actual flow performed by the current driver of the vehicle 102. The current driving skill of the driver is evaluated by comparing it with the executed maneuver flow.

These maneuver flows can be expressed by parameters such as the type, order, start timing, speed of the maneuver, and/or magnitude of the amount of the maneuver in a series of maneuvers. The driving skill evaluation device 112 evaluates the degree of deviation from the standard maneuver flow for each of the parameters in the currently executed maneuver flow of the driver, and calculates the result of the evaluation as a driving skill evaluation score. This driving skill evaluation score can be calculated, for example, with a value of 1 as the upper limit, and the lower the driving skill (that is, the larger the degree of the deviation), the smaller the value becomes.

Here, each parameter value constituting the above-mentioned execution maneuver flow may be acquired from the vehicle information acquisition device 108. Moreover, each parameter value regarding the standard operation flow can be determined and stored in advance for each driving scene.

The driving skill evaluation device 112 calculates the driving skill evaluation points at predetermined time intervals (e.g., every six months) based on driving operation data during a predetermined length of driving period (e.g., three months). It can be done. Further, for example, when the vehicle 102 is used by a plurality of users, the driving skill evaluation device 112 calculates the driving skill evaluation score for each user.

The driving skill evaluation device 112 outputs the calculated driving skill evaluation score for each driver to other devices via the in-vehicle network bus 104.

The user information management device 114 manages information (user information) about the user who uses the vehicle 102 as a driver. The user information may include each user's driving skill evaluation score and preference information. Specifically, the user information management device 114 includes a processing device 128 and a storage device 130. The processing device 128 is, for example, a computer including a processor such as a CPU. The storage device 130 includes, for example, a volatile and/or nonvolatile semiconductor memory, a hard disk device, and the like. The storage device 130 stores a driving skill database (driving skill DB) 132 and a preference information database (preference information DB) 134.

The driving skill DB 132 stores driving skill evaluation scores for each user. The processing device 128 receives the driving skill evaluation score for each user output from the driving skill evaluation device 112 and stores it in the driving skill DB 132.

The preference information DB 134 stores preference information of each user. The preference information includes, for example, information representing preference categories preferred by the corresponding user. The preference category may be composed of, for example, words representing fields of content (songs, movies, news, etc.), subclassifications for each field, and/or specific content. The above subcategories include, for example, songs such as classical music and pop, movies such as action, horror, and SiFi, and news such as sports, specific countries, and specific news sources. .

The processing device 128 outputs, for example, information on songs and videos played by the user using the AV output device 118 (described later), search keywords performed using a web browser provided by the AV output device 118, and output to the content providing device 120 (described later). The specified content information is acquired from the AV output device 118 and the content providing device 120. Then, the processing device 128 generates corresponding user preference information based on the acquired information and stores it in the preference information DB 134.

User information management device 114 also identifies the user currently using vehicle 102 as a driver. For example, in accordance with the prior art, the processing device 128 currently performs authentication processing using ID information obtained from a smart key or a mobile terminal used by each user, or a facial image of the driver obtained from the vehicle interior camera 122. Identify the user who is the driver of the vehicle.

The driving load calculation device 116 estimates the current driving load of the driver. The driving load calculating device 116 includes a processing device including a processor such as a CPU, and a storage device, and calculates the relevant load based on the current driving scene of the vehicle 102 and the current level of driving skill of the driver. Calculate the driver's current driving load.

Specifically, the driving load calculation device 116 acquires the current driving scene of the vehicle 102 from the driving scene evaluation device 110. Further, the driving load calculation device 116 acquires a driving skill evaluation score representing the current driving skill of the driver of the vehicle 102 from the user information management device 114.

The operating load calculation device 116 calculates, for example, a standard operating load that numerically represents the operating load that a standard driver (standard driver) would receive if the standard driver (standard driver) were to drive in the current driving scene. The current driving load of the current driver is calculated by multiplying by the driving skill evaluation score.

Here, the standard operating load may be expressed, for example, by a numerical value that takes a larger value as the operating load is higher. Further, the standard operating load may be determined and stored in advance for each categorized driving scene as described above, for example.

The AV output device 118 includes a processing device that is, for example, a computer including a processor such as a CPU, and plays music and videos according to conventional technology. Further, the AV output device 118 includes, for example, a web browser, and provides the user with information search and/or information viewing functions.

The AV output device 118 interacts with the driver via the UI control device 100. For example, the driver can give an instruction to play music or a video, or to search for information, etc., using a voice instruction via the microphone 140. The AV output device 118 receives the voice recognition result of the voice instruction via the UI control device 100, and executes the operation specified by the voice instruction. Further, the AV output device 118 outputs reproduced audio and video to the speaker 142 and the display device 144 via the UI control device 100, and/or displays searched information on the display device 144.

Additionally, the AV output device 118 may obtain one instruction through multiple interactions with the driver, according to the prior art. For example, the AV output device 118 receives a voice instruction from the driver, such as "Play the song ***" (*** is the artist's name), which instructs to play a song by a specific artist. In response to the instruction, the AV output device 118 searches for songs by the corresponding artist, for example, from among the songs stored in the storage device, displays the list on the display device 144, and displays a message such as "Select a song to play." The user instructs the UI control device 100 to make an outgoing utterance such as "Please do so." The AV output device 118 receives the driver's selection result as a response voice or as an input via the touch panel of the display device 144.

The content providing device 120 reads text information such as news and tourist information and provides it to the user. The content providing device 120 includes a processing device 136 composed of a processor such as a CPU, and a storage device 137. The content providing device 120 cooperates with the AV output device 118, for example, and stores, in the storage device 137, text information among the information searched by the web browser of the AV output device 118 based on instructions from the user. This text information is stored in the storage device 137 as news information 138 or tourist information 139, for example, for each category.

In addition, the processing device 136 outputs the text information stored in the storage device 137 as a reading voice from the speaker 142 in response to an instruction from the user via the UI control device 100. Here, generation of the text information reading voice can be performed using various techniques according to conventional techniques. Note that the processing device 136 may display, on the display device 144 via the UI control device 100, image information and display information accompanying the provision of the reading audio, in addition to the audio information of the reading audio generated above.

The UI control device 100 uses the AV output device 118 and the content providing device 120 as clients, and outputs audio information and image information output by these client devices from the speaker 142 and the display device 144. Further, the UI control device 100 acquires a user's voice instruction and input instruction or input data from the microphone 140 and the touch panel 146, respectively, and outputs them to the corresponding client device. As described above, the UI control device 100 particularly controls stopping and restarting audio output from these client devices to the user via the speaker 142.

Specifically, the UI control device 100 includes a processing device 150 and a storage device 152. The storage device 152 is configured of, for example, a volatile and/or nonvolatile semiconductor memory, and/or a hard disk device.

The processing device 150 is, for example, a computer including a processor such as a CPU. The processing device 150 may have a configuration including a ROM in which a program is written, a RAM for temporarily storing data, and the like. The processing device 150 includes a UI (user interface) control section 156 and an output control section 158 as functional elements or functional units.

The UI control section 156 includes a voice output section 160, a voice recognition section 162, a display control section 164, and an input processing section 166, which are functional elements or functional units. Also. The output control section 158 includes a stop instruction section 170, a scene judgment section 172, a factor estimation section 174, a condition determination section 176, a notification section 178, and a restart instruction section 180, which are functional elements or functional units. be done. Further, the factor estimation section 174 includes a load judgment section 186, a conversation judgment section 188, a sleep judgment section 190, and a content judgment section 192, which are functional elements or functional units.

These functional elements included in the processing device 150 are realized, for example, when the processing device 150, which is a computer, executes a program. Note that the above computer program can be stored in any computer-readable storage medium. Alternatively, all or part of the above-mentioned functional elements included in the processing device 150 may be configured by hardware each including one or more electronic circuit components.

The UI control unit 156 controls a microphone 140 that is a user interface, a speaker 142, a display device 144, and a touch panel 146 provided on a display screen of the display device 144.

The audio output unit 160 of the UI control unit 156 outputs audio information generated by these client devices from the speaker 142 in response to instructions from the AV output device 118 and content providing device 120, which are client devices. The audio information may include audio generated by the client device as well as sound information added to songs and videos.

According to the conventional technology, the speech recognition unit 162 obtains speech from the user using the microphone 140, performs speech recognition processing on the obtained speech, and outputs the speech to the AV output device 118 and the content providing device 120. Alternatively, the speech recognition unit 162 may further perform semantic analysis of the speech recognition processing result and output the analysis result to the AV output device 118 and the content providing device 120 according to the conventional technology.

The display control unit 164 controls the display device 144 to output images or videos instructed by the AV output device 118 and the content providing device 120. Further, the input processing unit 166 acquires the driver's input from the touch panel 146 and outputs the processing result of the acquired input to the AV output device 118 and the content providing device 120 according to the conventional technology.

The output control unit 158 controls audio output from the speaker 142. The output control unit 158 stops audio output from the speaker 142 in response to a stop instruction from the user. In addition, the output control unit 158 particularly estimates the reason why the user gave the stop instruction, and determines the conditions for restarting the stopped audio output according to the factor. Then, the output control unit 158 resumes audio output according to the determined restart condition. In particular, the output control unit 158 notifies the user in accordance with the estimated factors when audio output is restarted.

The stop instruction unit 170 of the output control unit 158 obtains a user's voice instruction to stop audio output, for example, via the voice recognition unit 162. The voice instruction may be, for example, an utterance such as "stop voice" or "stop voice". The stop instruction unit 170 may acquire, for example, volume information of the voice instruction from the UI control unit 156 along with the voice recognition result of the voice instruction.

The scene determination unit 172 evaluates the driving scene of the vehicle 102 in cooperation with the driving scene evaluation device 110. The scene determination unit 172 determines the development of a driving scene, that is, the start and end of various driving scenes that change over time. Specifically, the scene determination unit 172 acquires the certainty factor for each candidate scene calculated by the driving scene evaluation device 110 and the current driving scene at predetermined time intervals.

Then, the scene determination unit 172 determines that a new driving scene has started when the current driving scene acquired from the driving scene evaluation device 110 changes. Furthermore, when a new driving scene starts, the scene determination unit 172 determines the degree of certainty that the previous driving scene has ended based on the degree of certainty of the candidate scene corresponding to the immediately preceding driving scene (scene end certainty). Calculate. Here, the confidence level of the candidate scene can be expressed as a numerical value in the range of 0 or more and 1 or less, for example, the higher the degree of confidence, the larger the value, as described above. The scene end certainty can be calculated by subtracting from 1 the certainty of the candidate scene corresponding to the immediately preceding driving scene.

When the stop instruction unit 170 receives an instruction to stop audio output from the user, the factor estimation unit 174 estimates the factor that caused the user to issue the stop instruction. Specifically, the factor estimating unit 174 uses the load determining unit 186 to determine whether the cause of the stop instruction is an increase in the current driver's driving load on the vehicle 102.

More specifically, the load determining unit 186 acquires the current driving load of the driver from the driving load calculating device 116 at predetermined time intervals. Further, the load determining unit 186 determines whether the current operating load at the time when the stop instruction is received is equal to or higher than a predetermined level. If the current operating load at the time the stop instruction is received is equal to or higher than a predetermined level, the load determining unit 186 determines that the cause of the user issuing the stop instruction is an increase in the operating load. I judge that.

Further, the factor estimating unit 174 uses the conversation determining unit 188 to determine whether the cause of the stop instruction is a conversation between the user and a fellow passenger of the vehicle 102 . Here, the conversation between the user and the fellow passenger may include a conversation between the driver and the fellow passenger, and a conversation between the fellow passengers.

Specifically, the conversation determining unit 188 detects the presence of a plurality of occupants including the driver from the video of the vehicle interior camera 122 obtained via the camera control device 106. Furthermore, when a plurality of occupants are detected, the conversation determining unit 188 acquires the voice uttered inside the vehicle from the microphone 140 via the UI control unit 156. Then, the conversation determining unit 188 analyzes the acquired speech sounds, and if the time during which turn-taking (speaker change, alternating utterances) is being performed between the occupants is longer than a predetermined time, the conversation between the occupants is interrupted. It is determined that this is the case, and that the cause of the stop instruction is the conversation with the passenger.

Note that when it is determined that a conversation is taking place between the occupants and the driver is participating in the conversation, the conversation determining unit 188 determines that the cause of the stop instruction is the conversation with the fellow passenger. It may be determined that Whether or not the driver is participating in the conversation can be determined based on whether or not the driver's voice is included in the conversation. Here, whether or not the driver's voice is included in the conversation is determined based on, for example, a voice sample of the driver recorded in advance and stored in the user information management device 114. can do.

Further, the factor estimating unit 174 uses the sleep determining unit 190 to determine whether the cause of the stop instruction is the sleep of the fellow passenger of the vehicle 102. Specifically, the sleep determination unit 190 detects the presence of a fellow passenger from the image of the vehicle interior camera 122 obtained via the camera control device 106. Furthermore, when a fellow passenger is detected, the sleep determining unit 190 acquires the voice uttered inside the vehicle from the microphone 140 via the UI control unit 156. Then, when the volume of the acquired speech sound is below a predetermined level, the sleep determination unit 190 determines that the cause of the stop instruction is the fellow passenger's sleep.

Further, the factor estimating unit 174 uses the content determining unit 192 to determine whether the cause of the stop instruction is the content of information provided by the audio output that is the target of the stop instruction. Specifically, the content determination unit 192 acquires the current user's preference information from the user information management device 114, and selects the category of information provided by the voice instruction and the acquired current user's preference information. The degree of deviation between the preference category indicated by and the preference category is calculated. Then, when the calculated degree of deviation is equal to or higher than a predetermined level, the content determining unit 192 determines that the cause of the stop instruction is the content of the information provided by the audio output.

The above-mentioned degree of deviation can be calculated using various methods according to conventional techniques. For example, categories of information provided by audio output and preference categories are plotted in a multidimensional space consisting of multiple coordinate axes according to arbitrary predetermined definitions, and the distance between the categories in the multidimensional space is expressed as the degree of deviation. It can be calculated. The above-mentioned coordinate axes may be arbitrary, such as an axis scaled with "active" and "contemplative" as opposite poles as language expressing the characteristics of the category, or an axis scaled with "outdoors" and "indoors" as opposite poles. can be defined as

Here, when the factor estimating unit 174 receives a stop instruction from the user, the factor estimation unit 174 determines whether the cause of the stop instruction is an increase in the driver's driving load based on other factors (for example, passenger This takes precedence over decisions regarding conversation with passengers, the sleep of passengers, and the content of information. For example, the factor estimation unit 174 executes the judgments in the load judgment unit 186, the conversation judgment unit 188, the sleep judgment unit 190, and the content judgment unit 192 in this order, and selects the factors related to the judgment that first obtained a positive result. , is estimated to be the cause of the above stop instruction.

Next, the condition determination unit 176 of the output control unit 158 determines the conditions for restarting the audio output that was stopped by the stop instruction, according to the factor of the user's stop instruction estimated by the factor estimation unit 174. Specifically, for example, when the estimated factor is an increase in the operating load, the condition determining unit 176 determines the end of the driving scene that caused the increase in the operating load as the restart condition.

Further, for example, when the factor estimated by the factor estimating section 174 is a conversation with a fellow passenger, the condition determining section 176 determines the end of the conversation as the resumption condition. Furthermore, for example, when the factor estimated by the factor estimating section 174 is sleep of the fellow passenger, the condition determining section 176 determines a reduction in the volume of the audio output as the restart condition.

Alternatively, for example, when the factor estimated by the factor estimation unit 174 is the content of information, the condition determining unit 176 determines a change in the content of the information provided by audio output as the restart condition. Further, the condition determining unit 176 determines that when the factor estimating unit 174 cannot identify a factor, that is, the results of the determinations made by the load determining unit 186, the conversation determining unit 188, the sleep determining unit 190, and the content determining unit 192 are all negative. If so, it is determined that a predetermined period of time has elapsed since the stop instruction as a restart condition.

The notification unit 178 of the output control unit 158 notifies the user, using the speaker 142, for example, in accordance with the estimated factors when restarting audio output that has been stopped due to a stop instruction from the user. The notification may include the reason for resuming audio output according to the factor estimated by the factor estimation unit 174. Alternatively, the notification may include conditions for resuming audio output according to the estimated factors. Further, the notification may include an inquiry to the user regarding whether or not the stopped audio output can be resumed.

For example, when the factor estimated by the factor estimating unit 174 is a conversation with a fellow passenger, the notification unit 178 may display a message saying, ``It seems that you have finished talking with your fellow passenger, so you can resume the tourist information from earlier.'' Is this the case?”, etc. In this case, "It seems that you have finished talking with your fellow passenger" is a phrase indicating the reason for resuming audio output according to the factor estimated by the factor estimating unit 174, and "It seems that the conversation with the fellow passenger has finished" is a phrase that indicates the reason for restarting the audio output according to the factor estimated by the factor estimating section 174, and "It seems that the conversation with the fellow passenger has finished." "Are you sure you want to continue?" is an inquiry to the user regarding whether or not audio output that was stopped due to a stop instruction from the user can be resumed. Also, the part "Tourism information from earlier" serves as a reminder about the content of the audio output that was interrupted. Including such reminders in notifications is particularly important when the user's thoughts are not reflected in the audio output, such as when the interruption in audio output is longer than a predetermined amount of time, or when a conversation with a passenger is taking place during the interruption in audio output. If the user deviates from the content, the user can easily make a decision regarding the above-mentioned inquiry as to whether or not the restart is possible.

In addition, for example, when the factor estimated by the factor estimating unit 174 is the fellow passenger's sleep, the notification unit 178 may display a message saying, ``Since the fellow passenger seems to be sleeping, please lower the volume and resume the sightseeing information from earlier.'' "Are you sure you want to do this?", etc. In this case, "because the fellow passenger seems to be sleeping" is a phrase indicating the reason for restarting the audio output according to the factor estimated by the factor estimation unit 174. In addition, "Are you sure you want to lower the volume and resume the tourist information?" indicates the conditions for resuming audio output according to the factors estimated above, and also indicates the condition for restarting audio output according to the factors estimated above. This is an inquiry to the user regarding whether or not audio output can be resumed.

Furthermore, for example, when the factor estimated by the factor estimating section 174 is the content of the information, the notification section 178 may say, "Shall we change the topic? I have some information about your favorite basketball game. How about it?" ”, etc. As can be easily understood, the series of words included in the above notification are used to present the reason and conditions for restarting audio output according to the factors estimated by the factor estimation unit 174, and to provide information to the user regarding whether or not audio output can be restarted. Contains inquiries. In this case, the phrase "Shall we change the topic?" can be omitted. This is because the phrase "I have some information about your favorite basketball game, how would you like it?" implicitly indicates that the "content of the information" was assumed to be the cause of the stop instruction. be.

The notification unit 178 acquires the current driver's preference information from the user information management device 114 in order to propose a change in information content as a restart condition as described above. Furthermore, based on the acquired preference information, the notification unit 178 searches for content stored in the storage device of the content providing device 120, and searches for content that has a deviation distance from any of the preference categories indicated by the preference information that is equal to or less than a predetermined value. Extract the content of the category that is. Then, reproduction of the extracted content can be presented as the reproduction condition and the execution thereof can be proposed.

Further, when the factor estimated by the factor estimating unit 174 is "increase in operating load," the notification unit 178 provides a notification that includes the fact that the driving scene that caused the increase in operating load has ended as the reason for restarting. For example, the notification unit 178 makes a notification such as "Since an emergency vehicle has passed, are you sure you want to resume the sightseeing information from earlier?". Here, "because an emergency vehicle passed" is an expression of a driving scene that caused an increase in the driving load.

In addition, the notification unit 178 informs that the factor estimated by the factor estimating unit 174 is “increase in operating load” and that the elapsed time from the user's stop instruction to the end of the driving scene that caused the increase in operating load is a predetermined period of time. or less, and when the reliability of the determination of the end of the driving scene that caused the increase in the driving load is greater than or equal to a predetermined value, a notification including a predetermined sign sound is given to the user. Furthermore, when a notification including a predetermined sign sound is issued, the notification may not include an inquiry regarding whether or not audio output can be resumed. That is, in this case, audio output is automatically resumed following the sign sound.

As a result, when a user issues an instruction to stop audio output due to a temporary increase in the operating load, the user is able to stop the audio output without receiving any inquiries about restarting the audio output. The audio output can be heard again immediately after the resulting driving scene is finished.

Here, as mentioned above, the condition that "the reliability of the judgment of the end of the driving scene is more than a predetermined value" is that the audio output is automatically output before the driving scene actually ends. This is to more reliably prevent the situation from being restarted.

Note that the "reliability of determining whether the driving scene ends" corresponds to the scene end certainty calculated by the scene determining unit 172 described above. Further, the notification unit 178 may measure the elapsed time from the stop instruction to the end of the driving scene.

For example, the notification unit 178 starts measuring the elapsed time when the stop instruction unit 170 receives a stop instruction from the user, and when the factor estimated by the factor estimation unit 174 is “increase in operating load”. acquires the scene end certainty that is subsequently calculated by the scene determining unit 172. Then, the notification unit 178 can set the elapsed time from receiving the stop instruction to receiving the scene end certainty as the elapsed time from the stop instruction to the end of the driving scene that caused the increase in driving load. .

The restart instruction unit 180 of the output control unit 158 instructs the corresponding client when the user returns an affirmative response to the notification sent by the notification unit 178 that includes an inquiry regarding whether or not audio output can be resumed. The device, that is, the AV output device 118 or the content providing device 120, is instructed to resume audio output according to the notification.

Here, "resuming audio output according to the notification" means not only simply restarting audio output that has been stopped, but also when the estimated factor is "sleep of the passenger" or "content of information". Each means an audio output with a lower volume suggested in the notification, or an audio output of the information proposed in the notification. If these factors are estimated, for example, when instructing the corresponding client device to resume, the restart instruction unit 180 may specify the volume of the audio output to be resumed and the information to be provided, respectively. Add instructions. Note that the restart instruction section 180 may specify the volume of the audio output to be resumed to the audio output section of the UI control section 156.

When the UI control device 100 having the above configuration receives an instruction to stop audio output from a user while outputting audio such as audio content, the factor estimating unit 174 determines whether the user issues the stop instruction. Estimate the factors that led to this. Then, the condition determining unit 176 determines the conditions for restarting the stopped audio output according to the factors estimated by the factor estimating unit 174. Thereby, the UI control device 100 can restart audio output that has been stopped by the user under appropriate conditions depending on the cause of the stop.

Furthermore, when the UI control device 100 resumes audio output that has been stopped due to a stop instruction from the user, it notifies the user in accordance with the estimated factors described above. This notification may include the reason and/or conditions for restarting the audio output according to the estimated factors, and/or an inquiry to the user regarding whether or not the audio output can be restarted. Thereby, the UI control device 100 can resume audio output that the user has stopped while ensuring the user's satisfaction.

Next, the audio output control process executed by the output control unit 158 of the UI control device 100 will be described. FIG. 2 is a flow diagram showing the procedure of control processing. This process starts when the power of the UI control device 100 is turned on, and ends when the power of the UI control device 100 is turned off.

Note that in parallel with this process, the UI control unit 156 of the UI control device 100 outputs audio and images from the speaker 142 and display device 144 in response to instructions from the AV output device 118 and/or content providing device 120, which are client devices. . In addition, in parallel with this process, the UI control unit 156 acquires voice and input from the user using the microphone 140 and the touch panel, and transmits the same to the corresponding client device.

When the process starts, the output control unit 158 causes the scene judgment unit 172 to start evaluating the driving scene (S100). Next, the stop instruction unit 170 of the output control unit 158 determines whether or not there is audio output from the speaker 142 (S102). For example, when the AV output device 118 and the content providing device 120, which are client devices, start an operation that involves audio output to the user, they notify the UI control device 100 of the start of the audio output operation, and the stop instruction section 170 may determine whether or not there is audio output based on whether or not the notification has been received.

Then, when there is no audio output (S102, NO), the stop instruction unit 170 returns to step S102 and repeats the process. On the other hand, if there is audio output (S102, YES), the stop instruction unit 170 determines whether the user has given an instruction to stop audio output (S104). The stop instruction unit 170 receives a stop instruction from the user as a voice instruction acquired by the microphone 140 or an input acquired via the touch panel 146 from the voice recognition unit 162 or the input processing unit 166 of the UI control unit 156. Depending on whether or not the stop instruction is present, it can be determined whether or not the stop instruction has been issued.

Then, if there is no stop instruction (S104, NO), the stop instruction unit 170 determines whether or not the audio output has ended (S106). For example, when the AV output device 118 and the content providing device 120, which are client devices, finish an operation that involves audio output to the user, they notify the UI control device 100 of the end of the audio output operation, and the stop instruction section 170 may determine whether or not the audio output has ended based on whether or not the notification has been received.

Then, when the audio output is finished (S106, YES), the stop instruction unit 170 returns the process to step S102. On the other hand, if the audio output has not ended (S106, NO), the stop instruction unit 170 returns the process to step S104.

On the other hand, when there is a stop instruction from the user in step S104 (S104, YES), the stop instruction unit 170 instructs the corresponding client device to temporarily suspend the current audio output operation (S108). As a result, the corresponding client device interrupts the corresponding audio output operation and stands by.

Next, the output control unit 158 of the UI control device 100 causes the factor estimation unit 174 to execute a factor estimation process for estimating the factor that caused the user to issue the stop instruction (S110). Subsequently, the output control unit 158 executes a condition determination process (S112), and determines a restart condition for the interrupted audio output according to the estimated factors. Furthermore, the output control unit 158 executes a notification process (S114), and upon resuming the interrupted audio output, notifies the user according to the estimated factor. The procedures of the above factor estimation process, condition determination process, and notification process will be described later.

Next, the output control unit 158 causes the restart instruction unit 180 to instruct the corresponding client device to resume or terminate audio output based on the user's response to the above notification (S116), and then performs step S102. Return to and repeat the process.

Specifically, when the restart flag set in the notification process described below is 0, the restart instruction unit 180 instructs the corresponding client device to end audio output. On the other hand, when the restart flag is 1, the corresponding client device is instructed to restart audio output. At this time, if there is a restart condition set in the notification section 178, the restart instruction section 180 instructs the corresponding client device to use the restart condition.

Next, the procedure of the above-described factor estimation process (S110) will be explained. FIG. 3 is a flow diagram showing the procedure of factor estimation processing. When the process starts, the factor estimating unit 174 of the output control unit 158 uses the load determining unit 186 to determine whether the cause of the user's instruction to stop is an increase in the driving load of the driver of the vehicle 102. (S200). When it is determined that the above-mentioned factor is an increase in operating load (S200, YES), the load determining unit 186 sets the factor flag to 1 (S202), and then ends the process.

As a result, the factor estimating unit 174 determines whether or not the cause of the stop instruction is an increase in the driver's driving load, giving priority to determinations regarding other factors. Note that after the main process shown in FIG. 3 is finished, the process of the output control unit 158 is moved to the condition determination process of step S112 shown in FIG.

On the other hand, when it is determined that the cause of the user's stop instruction is not an increase in driving load (S200, NO), the cause estimating unit 174 determines that the conversation determining unit 188 determines that the cause of the user's stop instruction is not due to an increase in the driver and fellow passengers of the vehicle 102. It is determined whether the conversation is with (S204). If it is determined that the cause is a conversation with a fellow passenger (S204, YES), the conversation determining unit 188 sets the cause flag to 2 (S206), and then ends the process.

On the other hand, when it is determined that the cause of the user's stop instruction is not a conversation with a fellow passenger (S204, NO), the factor estimation unit 174 determines that the sleep determination unit 190 determines that the cause is the sleep of the fellow passenger of the vehicle 102. It is determined whether or not (S208). When it is determined that the above-mentioned factor is sleep of the fellow passenger (S208, YES), the sleep determining unit 190 sets the factor flag to 3 (S210), and then ends the process.

On the other hand, when it is determined that the cause of the user's stop instruction is not the fellow passenger's sleep (S208, NO), the content determination unit 192 determines that the factor estimation unit 174 determines that the cause is the information provided by the audio output. It is determined whether it is the content (S212). If it is determined that the above-mentioned factor is the content of the information (S212, YES), the content determining unit 192 sets the factor flag to 4 (S214), and then ends the process.

On the other hand, when it is determined that the factor is not the content of the information (S212, NO), the factor estimation unit 174 sets the factor flag to 0 (S216), and then ends the process.

Next, the procedure of the condition determination process (S112) shown in FIG. 2 will be explained. FIG. 4 is a flow diagram showing the procedure of condition determination processing. When the process starts, the condition determining unit 176 of the output control unit 158 determines whether the factor flag set in the above-described factor estimation process (FIG. 3) is set to 1 (S300). Then, when the factor flag is 1 (increase in operating load) (S300, YES), the condition determining unit 176 sets the end of the current driving scene that caused the increase in operating load as a condition for resuming audio output. After setting (S302), this process ends. Note that after the main process shown in FIG. 4 ends, the process of the output control unit 158 is moved to the notification process of step S114 shown in FIG. 2.

On the other hand, if the factor flag is not 1 in step S300 (S300, NO), the condition determining unit 176 determines whether the factor flag is set to 2 (S304). Then, when the factor flag is 2 (conversation with fellow passenger) (S304, YES), the condition determination unit 176 sets the end of the conversation as a condition for restarting audio output (S306), and then performs the main processing. end.

On the other hand, if the factor flag is not 2 in step S304 (S304, NO), the condition determining unit 176 determines whether the factor flag is set to 3 (S308). Then, when the factor flag is 3 (sleeping with a fellow passenger) (S308, YES), the condition determining unit 176 sets a reduction in the volume of the audio output as a condition for restarting the audio output (S310). This process ends.

On the other hand, when the factor flag is not 3 in step S308 (S308, NO), the condition determining unit 176 determines whether the factor flag is set to 4 (S312). Then, when the factor flag is 4 (information content) (S312, YES), the condition determination unit 176 sets a change in the content of the information provided by the audio output as a condition for restarting the audio output (S314). ), this process ends.

On the other hand, if the factor flag is not 4 in step S312 (S312, NO), the condition determining unit 176 sets the condition for restarting audio output as a predetermined time period after receiving the stop instruction. (S316), this process ends.

Next, the procedure of the notification process (S114) shown in FIG. 2 will be explained. FIG. 5 is a flow diagram showing the procedure of notification processing. When the process starts, the notification unit 178 of the output control unit 158 determines whether the factor flag set in the above-described factor estimation process (FIG. 3) is set to 1 (increase in operating load) (S400 ). Then, when the factor flag is 1 (S400, YES), the condition determining unit 176 causes the notification unit 178 to cause the increase in the operating load in accordance with the restart condition determined by the condition determining unit 176 in the condition determining process. The end of the current driving scene is waited for (S402). Whether or not the driving scene has ended can be determined based on whether the current driving scene that the scene determining unit 172 obtains from the driving scene evaluation device 110 at predetermined time intervals has changed.

Subsequently, the notification unit 178 determines whether the elapsed time from the stop instruction to the end of the driving scene is less than or equal to a predetermined time (for example, 5 seconds) (S404). If the elapsed time is less than or equal to the predetermined time (S404, YES), the notification unit 178 determines whether the scene end certainty of the driving scene determined to have ended in step S402 is greater than or equal to the predetermined value. (S406).

Then, when the scene end certainty is greater than or equal to the predetermined value (S406, YES), the notification unit 178 outputs a sign sound as a notification (S408), sets the restart flag to 1 (S410), and then performs the main processing. end. Note that after the main processing shown in FIG. 5 ends, the processing of the output control unit 158 is moved to step S116 shown in FIG. 2.

On the other hand, if the elapsed time exceeds the predetermined time in step S404 (S404, NO), or if the scene end certainty is less than the predetermined value (S406, NO), the notification unit 178 notifies the operator of the increase in operating load. A notification is output that includes an expression indicating that the driving scene that caused the problem has ended as the reason for resuming audio output, and an inquiry wording as to whether or not restarting audio output is permitted (S412).

Subsequently, the notification unit 178 determines whether or not the user's answer to the inquiry regarding permission or disapproval of restart is affirmative, that is, whether or not the restart of audio output is permitted (S414). If the user answer is not positive (S414, NO), that is, if it is negative, the notification unit 178 sets the restart flag to 0 (S416) and ends the process. On the other hand, if the user answer is affirmative (S414, YES), the process moves to step S410.

On the other hand, when the factor flag is not 1 in S400 (S400, NO), the notification unit 178 determines whether the factor flag is 2 (conversation with fellow passenger) (S418). Then, when the factor flag is 2 (S418, YES), the notification unit 178 waits for the end of the conversation with the fellow passenger according to the restart condition determined by the condition determination unit 176 in the condition determination process (S420). For example, based on the audio in the vehicle 102 acquired from the microphone 140, the notification unit 178 is configured to notify the user of a conversation with a fellow passenger when a period in which there is no voice uttered by the passenger or a period in which turn taking is not performed continues for a predetermined time or longer. It can be determined that the process has ended.

Next, the notification unit 178 outputs a notification including an expression indicating that the conversation has ended as the reason for restarting audio output, and an inquiry wording as to whether or not restarting audio output is permitted (S422), and then proceeds to step S414. Move.

On the other hand, when the factor flag is not 2 in S418 (S418, NO), the notification unit 178 determines whether the factor flag is 3 (passenger's sleep) (S424). Then, when the factor flag is 3 (S424, YES), the notification unit 178 sends the restart condition (reduction in volume) determined by the condition determination unit 176 in the condition determination process and the inquiry wording as to whether or not to permit resumption of audio output. After outputting the notification including (S426), the process moves to step S414.

On the other hand, when the factor flag is not 3 in S424 (S424, NO), the notification unit 178 determines whether the factor flag is 4 (information content) (S428). Then, when the factor flag is not 4 (S428, NO), the notification unit 178 determines that a predetermined period of time has elapsed since receiving the user's stop instruction, according to the restart condition determined by the condition determination unit 176 in the condition determination process. (S430). Subsequently, the notification unit 178 outputs a notification including the inquiry wording as to whether or not to permit resumption of audio output (S432), and then moves the process to step S414.

On the other hand, when the factor flag is 4 in S428 (S428, YES), the notification unit 178 inquires about the restart condition (change of content) determined by the condition determination unit 176 in the condition determination process and whether to permit or discontinue audio output. After outputting the notification including the text (S434), the process moves to step S414.

Note that the present invention is not limited to the configurations of the embodiments and modified examples described above, and can be implemented in various forms without departing from the gist thereof.

For example, in the embodiment described above, the UI control device 100 was shown as an example of the audio output control device, but the audio output control device according to the present invention is not limited to the UI control device 100. The audio output control device may be implemented as any device that controls audio output. For example, the audio output control device can be realized as a device obtained by removing the UI control unit 156 from the UI control device 100. Such an audio output control device can perform the control method shown in FIG. 2 in cooperation with a device obtained by removing the output control unit 158 from the UI control device 100.

In addition, the UI control device 100 determines an increase in driving load, a conversation between the user and a fellow passenger, sleep of a fellow passenger, and the content of provided information as candidates for the cause of the user issuing a stop instruction. However, the candidates for the above factors are not limited to these. For example, at least one of these may be determined as a candidate factor. Furthermore, other items may be determined as factor candidates.

For example, candidate factors include the presence or absence of a conversation through the window with a person outside the vehicle, driver changes, and temporary alighting of the driver, and any other items that may be a factor in instructing the audio output to stop. It can be done. In addition, in the example of the above-mentioned factor candidates, depending on each factor, the end of the conversation, the completion of a change of drivers, and the driver's re-boarding can be the conditions for resuming audio output.

In addition, in the above-described embodiment, an increase in driving load (development of a driving scene) is an example of a case where the time from the audio output stop instruction to the disappearance of the cause of the stop instruction (hereinafter referred to as factor disappearance time) is short. It was shown that when the factor extinction time is short, a sign sound is used as a notification to the user regarding the restart of audio output. However, the case where the factor disappearing time is short is not limited to the case where the operating load is increased as described above. For example, if the above-mentioned change of driver or temporary disembarkation of the driver causes the cause to disappear for a short time, a sign sound may be used as a notification to the user regarding resumption of audio output.

Further, in the embodiment described above, the UI control device 100, which is an audio output control device, is an in-vehicle device, but the implementation form of the audio output control device is not limited to an in-vehicle device. The audio output control device may be any device that controls audio output. Such a device may be, for example, a mobile terminal such as a smartphone. In this case, the portion of the mobile terminal that functions as the audio output control device may be realized as a software function section in the mobile terminal. A portion of such an audio output control device may have a configuration similar to that of the output control unit 158 of the UI control device 100 shown in FIG. 1, and may execute a control method similar to that of FIGS. 2 to 5. can.

As a result, the software function section stops the audio output generated by another software function section, for example, a function section that controls AV output, in response to a stop instruction from the user, and estimates the cause of the stop instruction. , the restart conditions can be determined according to the estimated factors, and a notification can be made according to the estimated factors. In this case, the output control section, which is a software function section of the mobile terminal, may not include parts corresponding to the scene judgment section 172 and the load judgment section 186 that perform operations related to driving scenes.

As described above, the UI control device 100, which is the audio output control device described above, executes the control method shown in FIGS. 2 to 5 in order to control audio output. This control method includes a step (S108) in which the stop instruction unit 170 stops audio output in response to receiving an instruction to stop audio output from the user during audio output to the user. Further, in this control method, in response to receiving the stop instruction, the factor estimating unit 174 estimates the cause of the user giving the stop instruction (S110), and restarts the stopped audio output. In doing so, the notification unit 178 notifies the user in accordance with the estimated factors (S114).

According to this configuration, the audio output that the user has stopped can be appropriately restarted while ensuring the user's satisfaction.

Furthermore, the notification may include a reason for resuming the audio output according to the estimated factor (S412, S422). Furthermore, the notification may include conditions for resuming the audio output according to the estimated factors (S426, S434). According to these configurations, the user is explicitly or implicitly shown what factors are estimated to be the cause of the above-mentioned stop instruction. Can be restarted appropriately.

Users may also include the driver of vehicle 102. In the step of notifying (S114), when the estimated factor is an increase in the driver's driving load, the notification includes the termination of the driving scene that caused the increase in the driving load as the reason for restarting. S412). According to this configuration, as the reason for restart included in the notification, an expression related to "end of driving scene" that is easy for the driver to understand is used instead of an intuitive expression such as "reduction in driving load." Therefore, according to the above configuration, audio output can be appropriately resumed while ensuring the satisfaction of the user who is the driver.

Further, the notification includes an inquiry to the user regarding whether or not the stopped audio output can be resumed (S412, S422, S426, S432, S434). According to this configuration, since the user's permission is requested when restarting audio output, the user's consent can be more reliably ensured.

In addition, in the above-mentioned notification step (S114), the estimated factor is an increase in the driver's driving load (S400, YES), and the period from the above-mentioned stop instruction to the end of the driving scene that caused the increase in the driving load is determined. If the elapsed time is less than or equal to the predetermined time (S404, YES), and the reliability of the determination of the end of the driving scene that caused the increase in the driving load (scene end certainty) is greater than or equal to the predetermined value (S406, YES), a notification including a predetermined sign sound is given to the user (S408).

Generally, the driving load of a vehicle can change quickly depending on the development of a driving scene. Therefore, in a vehicle, there may be many situations in which it is desired to stop audio output for a very short period of time. In such a case, if the driver is notified of the reason for restarting one after another, it may be rather inconvenient for the driver. According to the above configuration, the rapid development of the driving scene is quickly and reliably captured, and the notification is made using a sign sound that can be intuitively understood without notifying the reason for restarting, thereby ensuring user convenience. , audio output can be resumed appropriately.

Further, the notification including the predetermined sign sound does not include an inquiry to the user regarding whether or not the stopped audio output can be resumed (S408). According to this configuration, in the above-mentioned situation where it is desired to stop the audio output for a very short period of time, the inquiry to the user about permission to restart is omitted, so the driver who is dealing with the rapid development of the driving scene is not bothered. , audio output can be resumed appropriately.

Further, the UI control device 100, which is an audio output control device, controls audio output. The UI control device 100 includes a stop instruction unit 170 that stops the audio output in response to receiving an instruction to stop audio output from the user during audio output to the user, and a stop instruction unit 170 that stops the audio output in response to receiving the instruction to stop audio output from the user. , a factor estimating unit 174 that estimates the cause of the user giving the stop instruction; and a notification unit 178 that notifies the user in accordance with the estimated factor when restarting the stopped audio output. Equipped with.

According to this configuration, the audio output that the user has stopped can be appropriately restarted while ensuring the user's satisfaction.

100... UI control device, 102... Vehicle, 104... In-vehicle network bus, 106... Camera control device, 108... Vehicle information acquisition device, 110... Driving scene evaluation device, 112... Driving skill evaluation device, 114... User information management device, 116... Operating load calculation device, 118... AV output device, 120... Content providing device, 122... Vehicle interior camera, 124... Vehicle exterior camera, 126... Sensor group, 128, 136, 150... Processing device, 130, 137, 152... Storage device, 132... Driving skill DB, 134... Preference information DB, 138... News information, 139... Tourist information, 140... Microphone, 142... Speaker, 144... Display device, 146... Touch panel, 156... UI control unit, 158... Output control unit, 160...Audio output unit, 162...Speech recognition unit, 164...Display control unit, 166...Input processing unit, 170...Stop instruction unit, 172...Scene judgment unit, 174...Factor estimation unit, 176...Condition determination 178... Notification section, 180... Resume instruction section, 186... Load judgment section, 188... Conversation judgment section, 190... Sleep judgment section, 192... Content judgment section.

Claims (7)

A method for controlling audio output, the method comprising:
a step in which the stop instruction unit stops the audio output in response to receiving an instruction to stop the audio output from the user during the audio output to the user;
In response to receiving the stop instruction, a factor estimation unit estimates a factor why the user gave the stop instruction;
When restarting the stopped audio output, a notification unit notifies the user according to the estimated factor;
has
The notification includes a condition for resuming the audio output according to the factor estimated in the estimating step.
Control method. The notification includes a reason for resuming the audio output according to the estimated factor,
The control method according to claim 1. The user includes a driver of a vehicle,
In the step of notifying, when the estimated factor is an increase in the driving load of the driver, the notification includes the termination of the driving scene that caused the increase in the driving load as the reason for restarting.
The control method according to claim 2. 4. The control method according to claim 1 , wherein the notification includes an inquiry to the user regarding whether or not the stopped audio output can be restarted. The user includes a driver of a vehicle,
In the step of notifying,
The estimated factor is an increase in the driving load of the driver,
The elapsed time from the stop instruction to the end of the driving scene that caused the increase in the driving load is less than or equal to a predetermined time, and
When the reliability of the determination of the end of the driving scene that caused the increase in the driving load is equal to or higher than a predetermined value,
giving the user the notification including a predetermined sign sound;
A control method according to any one of claims 1 to 4 . The notification including the predetermined sign sound does not include an inquiry to the user regarding whether or not restart is possible.
The control method according to claim 5 . An audio output control device that controls audio output,
a stop instruction unit that stops the audio output in response to receiving an instruction to stop audio output from the user during audio output to the user;
a factor estimation unit that estimates a factor why the user gave the stop instruction in response to receiving the stop instruction;
a notification unit that notifies the user in accordance with the estimated factor when restarting the stopped audio output;
Equipped with
The notification includes a condition for resuming the audio output according to the factor estimated by the factor estimation unit.
Audio output control device.

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