JP6589388B2 - Audio reproduction control system, method and program - Google Patents

Description

  The present invention relates to a sound reproduction control system, method, and program.

  A technique is known in which the content playback time is dynamically changed so that the specified audio content is played at a point specified in advance (see Patent Document 1). In Patent Document 1, the length of content playback time is changed by repeating a part of the content, deleting it, or performing a crossfade.

Japanese Patent No. 4915292

However, there is a problem that the user feels uncomfortable when a part of the content is repeated, deleted, or crossfade is performed.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a technique that can reduce the user's uncomfortable feeling when adjusting the playback time of content.

  In order to achieve the above object, an audio reproduction control system according to the present invention includes a planned movement route acquisition unit that acquires a planned movement route of a user, and a target time for ending reproduction of audio content based on the planned movement route. A target time acquisition unit that acquires a certain target time, a scheduled time acquisition unit that acquires a scheduled time that is a time at which playback of audio content is scheduled to end, and a guidance period in which voice guidance for a planned movement route is performed, An adjustment unit that adjusts the playback speed of the audio content so as to reduce the difference between the target time and the scheduled time.

  In order to achieve the above object, the audio reproduction control method according to the present invention includes a planned movement route acquisition step for acquiring a user's planned movement route, and a target for ending reproduction of audio content based on the planned movement route. A target time acquisition step of acquiring a target time that is a time, a scheduled time acquisition step of acquiring a scheduled time that is a time at which the reproduction of the audio content is scheduled to be completed, and a guidance period during which voice guidance for the planned movement route is performed The adjusting step of adjusting the reproduction speed of the audio content so as to reduce the difference between the target time and the scheduled time.

  Furthermore, in order to achieve the above-described object, the audio reproduction control program of the present invention includes a target movement route acquisition function for acquiring a user's planned movement route, and a target for ending reproduction of audio content based on the planned movement route. A target time acquisition function that acquires a target time that is a time, a scheduled time acquisition function that acquires a scheduled time that is a time at which playback of audio content is scheduled to end, and a guidance period during which voice guidance is provided for a planned travel route The computer is caused to realize an adjustment function for adjusting the reproduction speed of the audio content so as to reduce the difference between the target time and the scheduled time.

  In the present invention configured as described above, the user may notice that the playback speed is adjusted in order to adjust the playback speed of the audio content within the guidance period in which the voice guidance for the planned travel route is performed. Can be reduced. That is, during the guidance period, voice guidance reduces the ease of listening to the voice content, and the user's attention is drawn to the voice guidance, so that the user's uncomfortable feeling when adjusting the playback speed of the voice content can be reduced.

It is a block diagram of a sound reproduction control system. (2A) is a schematic diagram of a planned movement route, and (2B) to (2D) are timing charts of audio reproduction. It is a flowchart of a reproduction | regeneration control process.

Here, embodiments of the present invention will be described in the following order.
(1) Configuration of audio playback control system:
(2) Playback control processing:
(3) Other embodiments:

(1) Configuration of audio playback control system:
FIG. 1 is a block diagram showing a configuration of a navigation device 10 as an audio reproduction control system according to an embodiment of the present invention. The navigation device 10 is provided in a vehicle. The navigation device 10 includes a control unit 20 including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Random Access Read Only Memory), an ASIC (Application Specific Integrated Circuit), and the like, and a recording medium 30. The control unit 20 executes a program stored in the recording medium 30 or the ROM. The control unit 20 executes a navigation program 21 as a sound reproduction control program.

  On the recording medium 30 of the navigation apparatus 10, map information 30a, route information 30b, audio content data 30c, and audio guidance data 30d are recorded. The map information 30a includes node data indicating the position of a node set on the road on which the vehicle is traveling, and shape interpolation data indicating the position of a shape interpolation point for specifying the shape of a road section connecting the nodes. , Link data showing various information about road sections (section length, travel time, width, number of lanes, etc.), location and attributes of facilities that can be destinations and waypoints (stations, schools, stores, homes, offices, etc.) The facility data etc. which show are included.

  The vehicle includes a position sensor 40, a touch panel display 41, a speaker 42, and a communication unit 43. The position sensor 40 is a sensor that measures various information for specifying the current position of the vehicle. For example, a GPS receiver, a vehicle speed sensor, or a gyro sensor may be provided as the position sensor 40. The control unit 20 may specify the current position of the vehicle by performing known map matching using the output signals of these position sensors 40 and the map information 30a. The touch panel display 41 serves as both an output device that outputs an image to the screen and an input device that accepts a user's input operation depending on a contact position of a finger or the like on the screen. The speaker 42 is driven according to the drive signal output from the navigation device 10 and outputs sound. Communication unit 43 includes a circuit for receiving current status information distributed from the traffic information center. The control unit 20 acquires current status information via the communication unit 43. The current status information is information indicating at least the current travel time for each road section. The current travel time may be specified based on, for example, probe information transmitted from the probe car to the traffic information center, or may be specified based on information transmitted from a sensor provided on the road to the traffic information center. May be.

  Based on the map information 30a, the control unit 20 accepts designation of a destination and the like, and uses a known route search method such as the Dijkstra method to drive the vehicle to travel to the destination or the like. Explore. When searching for the planned travel route, the control unit 20 records on the recording medium 30 the route information 30b indicating the road sections and the destination that constitute the planned travel route. The route information 30b is information indicating a series of road sections constituting the planned travel route. The route information 30b also includes information for specifying a guidance intersection on the planned travel route. The guidance intersection is an intersection scheduled to perform guidance on the planned travel route. For example, when traveling on the planned travel route, the change angle of the traveling direction of the vehicle becomes a predetermined angle (for example, 30 degrees) or more. It may be an intersection.

  The audio content data 30c is data in which audio content that is reproduced by the speaker 42 is stored. The audio content data 30c of the present embodiment is an audio file of music prepared for each song, and information indicating a reproduction period, which is a period required for reproduction at a reproduction speed of a reference speed (basically 1 time). It is attached. A plurality of audio content data 30c is recorded on the recording medium 30. The control unit 20 performs predetermined signal processing (decoding, audio adjustment, D / A conversion, amplification, etc.) on the audio content data 30c, and outputs a drive signal for driving the voice coil to the speaker 42. The control unit 20 includes an audio processing ASIC that performs decoding, audio adjustment, and D / A conversion. The audio processing ASIC includes a DSP (digital signal processor) for performing audio adjustment, and the reproduction speed can be adjusted in the DSP. The DSP adjusts the playback speed without changing the pitch.

  The voice guidance data 30d is voice data for causing the speaker 42 to output voice guidance for guiding the planned travel route. The voice guidance data 30d is a voice file prepared for each voice guidance message, and is attached with information indicating a guidance period which is a period required for reproduction at a fixed reproduction speed (1 time). For example, when the guidance of the planned travel route is started, the control unit 20 generates voice guidance data 30d necessary for the guidance of the planned travel route and records it in the recording medium 30. The control unit 20 acquires voice guidance data 30d corresponding to the guidance contents for each guidance point on the planned travel route, and performs predetermined signal processing (decoding, voice adjustment, D / A conversion, amplification, etc.) on the voice guidance data 30d. And a drive signal for driving the voice coil is output to the speaker 42.

  In the audio processing ASIC, an amplification circuit that amplifies the drive signal after D / A conversion, a music drive signal derived from the audio content data 30c, and an audio guidance drive signal derived from the audio guidance data 30d are synthesized. And an adder circuit for outputting to the speaker 42. As a result, the music and the voice guidance are synthesized and can be output from the speaker 42. Of course, music and voice guidance may be combined at the digital signal stage.

The navigation program 21 includes a planned travel route acquisition module 21a, a target time acquisition module 21b, a planned time acquisition module 21c, an adjustment module 21d, and a route guidance module 21e.
The planned movement route acquisition module 21a is a program module that causes the control unit 20 to realize the function of acquiring the planned movement route of the user. That is, by the function of the planned travel route acquisition module 21 a, the control unit 20 acquires the planned travel route of the user who gets on the vehicle and moves from the route information 30 b recorded in the recording medium 30 in advance. The control unit 20 acquires the departure point and the destination based on the user's operation on the touch panel display 41 by the function of the planned movement route acquisition module 21a. Then, the control unit 20 searches for a planned travel route composed of a series of road sections connecting from the departure place to the destination by a known route search method such as the Dijkstra method, and shows route information indicating the planned travel route. 30b is recorded on the recording medium 30.

  The target time acquisition module 21b is a program module that causes the control unit 20 to realize a function of acquiring a target time, which is a target time for ending reproduction of audio content, based on the scheduled movement route. Specifically, by the function of the target time acquisition module 21b, the control unit 20 predicts the estimated arrival time to arrive at the destination of the planned movement route, and acquires the estimated arrival time as the target time. In other words, the control unit 20 acquires the target time so that the reproduction of the audio content can be completed at the same time when the destination is reached. In the present embodiment, the control unit 20 obtains a required period by adding up the current travel time of each road section constituting the planned travel route (an untraveled portion), and adds the required period to the current time. Thus, the estimated arrival time is predicted. That is, the control unit 20 acquires the required period by totaling the current travel times distributed by the traffic information center. Therefore, the target time can change within the period of traveling on the planned travel route. The control unit 20 may predict the estimated arrival time based on the state of a feature such as a traffic signal on the planned movement route, or may predict the estimated arrival time based on a past travel history such as a vehicle speed. May be.

  The scheduled time acquisition module 21c is a program module that causes the control unit 20 to realize a function of acquiring a scheduled time that is a scheduled time at which the reproduction of audio content is scheduled to end. Specifically, by the function of the scheduled time acquisition module 21c, the control unit 20 creates a playback plan of the audio content, and plays back the audio content data 30c that is planned to be played in the playback plan (the audio being played back). The total reproduction period is acquired by summing up the unreproduced portion of the content data 30c, and the scheduled time is acquired by adding the total reproduction period to the current time. In the reproduction plan, it is planned to reproduce single or plural audio content data 30c. If no change is made to the playback plan, the scheduled time at which the playback of the audio content ends does not change unless the playback speed of the audio content changes from the reference speed. If a reference speed with a magnification other than 1 (X) is set, the control unit 20 acquires the scheduled time by adding a period obtained by dividing the total reproduction period by X to the current time. That's fine. For example, the reference speed may be arbitrarily set by the user.

  The adjustment module 21d is a program that causes the control unit 20 to realize a function of adjusting the playback speed of the audio content so as to reduce the difference between the target time and the scheduled time within the guidance period in which the voice guidance for the planned movement route is performed. It is a module. Specifically, when the guidance period approaches, the control unit 20 acquires the absolute value of the value obtained by subtracting the scheduled time from the target time as a difference, and the difference is equal to or greater than a predetermined threshold. In this case, the playback speed of the audio content during the guidance period is adjusted to a speed other than the reference speed. On the other hand, when the difference between the target time and the scheduled time is less than the threshold, the control unit 20 keeps the playback speed of the audio content during the guidance period at the reference speed.

  FIG. 2A is a schematic diagram of the planned travel route R. In the figure, a planned movement route R that turns right at the guidance intersection W from the current position N of the vehicle toward the destination is shown. Guidance points P1 to P3 are provided at positions that are predetermined remaining distances L1 to L3 (L1> L2> L3) to the guidance intersection W, respectively. Voice guidance starts when the current position N of the vehicle passes through each of the guide points P1 to P3. That is, the guidance period starts when the current position N of the vehicle passes through each of the guidance points P1 to P3. The guidance content at the guidance points P1 to P3 is determined by the name of the guidance intersection W (noted as abc intersection), the direction of travel at the guidance intersection W (right direction), and the remaining distances L1 to L3. The length is determined. For example, the guidance content corresponding to the guidance point P1 is “turn right at the 300M ahead abc intersection”, and the length of the required period when the guidance content is output at a fixed playback speed (1 ×) is the guidance period. It becomes length.

  In the present embodiment, the control unit 20 adjusts the playback speed of the audio content within the next guidance period so that the difference between the target time and the scheduled time becomes 0 by the function of the adjustment module 21d. Here, within the next incoming guide period means one incoming guide period. As shown in FIG. 2A, in the vehicle that is present at the current position N, the next guidance period means a guidance period that starts when the vehicle passes the guidance point P1.

Here, the processing of the adjustment module 21d will be described with reference to FIGS. 2B and 2C. Figure 2B, as shown in 2C, the difference between the target time M and scheduled time E and T _D, the length of the guide period G and T _G. As shown in FIG. 2B, when the scheduled time E is earlier than the target time M, that is, when the target time M scheduled to arrive at the destination is later than the scheduled time E scheduled to finish the reproduction of the audio content, the control unit 20 Sets the difference T _D between the target time M and the scheduled time E after the end of the guidance period to 0 by setting the reproduction speed of the audio content within the guidance period to (T _G −T _D ) / T _G <1. And That is, by reproducing the portion B having a length of (T _G −T _D ) over the entire length T _G of the guidance period G out of the audio content that was scheduled to be reproduced in the guidance period G. The timing at which the reproduction of the audio content ends is delayed by the difference T _D.

On the contrary, as shown in FIG. 2C, when the scheduled time E is later than the target time M, that is, when the playback ends later than the arrival at the destination, the playback speed of the audio content within the guidance period is set to (T _G + T _D ) / T _G > 1 makes the difference T _D between the target time M and the scheduled time E zero. That is, among the guidance period G and the audio content scheduled to be reproduced immediately after the guidance period G, the portion B having a length of (T _G + T _D ) is multiplied by the entire length T _G of the guidance period G. By playing back, the timing at which the playback of the audio content ends is advanced by the difference T _D.

  The route guidance module 21e is a program module that causes the control unit 20 to realize a function of causing the speaker 42 to output voice guidance of the planned travel route R. That is, when the current position N of the vehicle passes through the guidance points P1 to P3, the control unit 20 acquires the voice guidance data 30d of the guidance content corresponding to the guidance points P1 to P3, and drives the voice guidance data 30d as a drive signal. And output to the speaker 42. The reproduction speed of the voice guidance data 30d is a fixed one.

In the configuration of the present embodiment described above, the user may notice that the playback speed is adjusted in order to adjust the playback speed of the audio content within the guidance period G in which the voice guidance for the planned movement route R is performed. Can be reduced. In other words, within the guidance period G, the ease of hearing of the audio content is reduced by the audio guidance, and the user's attention is attracted to the audio guidance, so the user's uncomfortable feeling when adjusting the playback speed of the audio content can be reduced. . Furthermore, as the difference T _D between the target time M and scheduled time E becomes zero, by adjusting the playback speed of the audio content in the next guidance period in G arriving, each time elapses guiding period G, the difference T _D between the target time M and the estimated time of E can be set to 0, the difference between the target time M and the estimated time of E smaller can be maintained.

(2) Playback control processing:
Next, the reproduction control process executed by the navigation program 21 will be described in detail. FIG. 3 is a flowchart showing the reproduction control process. In the present embodiment, the reproduction control process is executed when the planned movement route R is searched by the control unit 20 and guidance of the planned movement route R is started. Note that the reproduction control process may be executed when an operation for reproducing audio content is accepted during guidance of the planned movement route R.

  First, the control unit 20 acquires the planned movement route R by the function of the planned movement route acquisition module 21a (step S100). That is, the control unit 20 acquires the planned movement route R to be guided from the route information 30 b recorded in advance on the recording medium 30.

Next, by the function of the target time acquisition module 21b, the control unit 20 acquires the arrival time scheduled to arrive at the destination of the planned movement route R as the target time M (step S110).
That is, the control unit 20 obtains a required period by totaling the current travel time of each road section constituting the planned movement route R, and sets the estimated arrival time obtained by adding the required period to the current time as the target time M. get.

Next, by the function of the scheduled time acquisition module 21c, the control unit 20 starts playback of the audio content whose playback ends at the target time M (step S120). Here, the control unit 20 creates a reproduction plan for the audio content data 30c so that the reproduction of the audio content data 30c to be reproduced ends at the target time M. Specifically, the control unit 20, so that the difference T _D between the scheduled time E and the target time M is equal to or less than the threshold (e.g., 10 seconds), be one or more selected audio content data 30c to be reproduced Create a regeneration plan.

When the reproduction plan is created, the control unit 20 starts reproduction of the audio content data 30c planned in the reproduction plan. By the above processing, the vehicle may terminate the reproduction of the audio content in approximately the same time (hereinafter difference T _D is a threshold) and to arrive at the destination. However, since the target time M changes when there is a change in the current travel time of any road section that constitutes the planned travel route R, the audio content is played back almost simultaneously with the arrival of the vehicle at the destination. May not finish.

  Next, the control unit 20 determines whether or not the guidance period G is near by the function of the target time acquisition module 21b (step S130). For example, the control unit 20 determines that the guidance period G is short when the current position N of the vehicle approaches the guidance points P1 to P3 on the planned movement route R within a predetermined distance (for example, 10 m). To do.

  When it is not determined that the guidance period G is near (step S130: N), the control unit 20 returns to step S130 by the function of the target time acquisition module 21b. That is, the control unit 20 waits until the guidance period G is near.

  When it determines with the guidance period G being near (step S130: Y), the control part 20 determines whether the target time M changed with the function of the target time acquisition module 21b (step S140). Specifically, when new current status information is acquired via the communication unit 43, the control unit 20 updates the latest target based on the current travel time and current time of each road section constituting the planned travel route R. Time M is acquired, and it is determined whether or not the latest target time M has changed by a reference value (for example, 10 seconds) or more from the initial target time M (= scheduled time E) acquired in step S120.

  When it is not determined that the target time M has changed (step S140: N), the control unit 20 returns to step S130 by the function of the target time acquisition module 21b. That is, the control unit 20 waits until the next guidance period G is near and the target time M is changed.

When it is determined that the target time M has changed (step S140: Y), the control unit 20 sets the reproduction speed in the guidance period G by the function of the adjustment module 21d (step S150). As shown in FIG. 2B, when the scheduled time E is earlier than the target time M, that is, when the latest target time M changes so as to be delayed from the target time M acquired in step S120, the control unit 20 Is set to (T _G −T _D ) / T _G <1. As shown in FIG. 2C, when the latest scheduled time E is later than the target time M, that is, when the latest target time M changes so as to be earlier than the target time M acquired in step S120, the audio content within the guidance period Is set to (T _G + T _D ) / T _G > 1.

Then, when the voice guidance of the planned movement route R starts, the control unit 20 adjusts the reproduction speed of the audio content by the function of the adjustment module 21d (step S160). That is, at the same time that the voice guidance starts to be synthesized with the audio content of the music, the control unit 20 sets the reproduction speed of the audio content from the reference speed (1 time magnification) before the adjustment in step S150 (T Adjust to ( _G− T _D ) / T _G times or (T _G + T _D ) / T _G times.

Further, when the voice guidance of the planned travel route R is completed, the control unit 20 returns the playback speed of the audio content to the reference speed by the function of the adjustment module 21d (step S170). That is, the control unit 20 again adjusts the magnification of the playback speed of the audio content from (T _G −T _D ) / _TG times or (T _G + T _D ) / _TG times set in step S150. Return to the previous reference speed (basically 1x).

By performing each of the guide period G approaches the above processing (step S130~S170), it may be zero difference T _D between the target time M scheduled time E each time the guide period G arrives. Since the difference T _D can be set to 0 every time the guidance period G arrives, the magnitude of the difference T _D can be kept small. Therefore, the possibility that the size of the difference T _D becomes extremely large is reduced, and the (T _G −T _D ) / T _G times or (T _G + T _D ) / T _G times set in step S150 is the reference. The possibility of extremely deviating from the speed magnification can be reduced. In the present embodiment, since the rehabilitation plan so that the difference T _D is 0 is created between the target time M scheduled time E at the time of starting the reproduction of the audio content, the difference from the stage of start of reproduction of the audio content it can be kept small size of T _D.

(3) Other embodiments:
The above embodiment is an example for carrying out the present invention, and the embodiment can be changed within a range not impairing the effect of the present invention. Control unit of the function of the adjustment module 21d 20, if the current time than the predetermined reference becomes time close to the target time M, so as to reduce the difference T _D between the target time M scheduled time E The playback speed of the audio content may be adjusted within the guidance period G. For example, when the current time is closer to the target time M than a predetermined reference (for example, 5 minutes), the process may proceed from step S120 to step S130 in FIG. Note that when the distance from the current position N to the destination on the planned movement route R becomes a predetermined distance, the control unit 20 determines that the current time is closer to the target time M than the predetermined reference. You may consider that

  Here, as the period up to the target time M is larger, there is a greater possibility that the planned movement route R cannot be moved as planned due to an unexpected event during the period, so that the adjustment of the reproduction speed performed earlier does not make sense. There may be no cases. Therefore, by adjusting the playback speed of the audio content at a timing approaching the target time M to some extent, it is possible to reduce the possibility of unnecessary adjustment.

Adjustment module 21d control unit 20 through the function of, as the difference T _D between the target time M and scheduled time E becomes zero, even to adjust the playback speed of the audio content in a plurality of guide duration in G coming future Good. For example, when the vehicle approaches the guidance point P1 in FIG. 2A, the control unit 20 determines the reproduction speed at each of the two guidance points P1 and P2 based on the difference T _D between the target time M and the scheduled time E. May be set. In this case, the control unit 20 may set the reproduction speed so that the reproduction speeds in the two guidance periods G are uniform.

FIG. 2D is a timing chart illustrating the reproduction speed in the two guidance periods G.
As shown in the figure, the control unit 20, the difference T _D 2 is divided, assigned to each of the two guide period G1, G2. Assuming that the difference T _D after the division is the differences T _D1 and T _D2 , the playback speed is such that the differences T _D1 and T _D2 become 0 in each of the two guide periods G1 and G2 (lengths T _G1 and T _G2 ). Will be set. The control unit 20 assigns the difference between the reproduction periods G1 and G2 so that the reproduction speed magnifications (T _G1 + T _D1 ) / T _G1 and (T _G2 + T _D2 ) / T _G2 match in each of the guidance periods G1 and G2. Set T _D1 and T _D2 . As shown in FIG. 2B, when the reproduction ends early, the control unit 20 determines the reproduction speed magnification (T _G1 -T _D1 ) / T _G1 , (T _G2 -T _D2 ) / in each of the guidance periods G1 and G2. The differences T _D1 and T _D2 assigned to the guidance periods G1 and G2 may be set so that T _G2 matches. Of course, the control unit 20, so that the difference T _D between the target time M and scheduled time E becomes zero, may adjust the playback speed of the audio content in more than three guiding period in G incoming future.

With the above configuration, the playback period of the audio content can be adjusted in a distributed manner in each guidance period G. Therefore, since the adjustment amount of the playback speed of the audio content in each guidance period G can be reduced, the user's uncomfortable feeling can be reduced. Therefore, it is possible to reduce the discomfort of the user, even if the difference T _D between the target time M and the estimated time of E is large. Accordingly, the control unit 20 may not necessarily create a rehabilitation plan so that the difference T _D between the scheduled time E and the target time M is equal to or less than the threshold, the difference T _D between the scheduled time E and the target time M A regeneration plan may be created so as to be minimized. In addition, the control unit 20, may be to create a rehabilitation plan, regardless of the difference T _D of the scheduled time E and the target time M.

Further, the control unit 20 of the function of the adjustment module 21d, adjusted the playback speed of the audio content in the target time so that the difference T _D between the M and the scheduled time E becomes 0, then incoming guided period in G of if the reproduction speed is outside the range determined in advance, so that the difference T _D between the target time M and scheduled time E becomes zero, the playback speed of the audio content in a plurality of guide duration in G coming future You may adjust. For example, the control unit 20 performs a reproduction speed magnification T _G1 / (T _G1 + T _D ) or T _G1 / (T _G1 −T _D ) at which the difference T _D is 0 in one guide period G1 (length T _G1 ). ) And a deviation amount (absolute value) of the magnification T _G1 / (T _G1 + T _D ) or T _G1 / (T _G1 −T _D ) from the reference speed (1 time) is determined in advance (for example, 0). ~ 0.5), the playback speed of the audio content in the two future guidance periods G may be adjusted by the method described above. Furthermore, when the deviation amount of the reproduction speed of the audio content within the two guidance periods G from the reference speed (1 time) is outside the predetermined range, the future three guidance periods G The playback speed of the audio content may be adjusted. That is, when the deviation amount of the reproduction speed of the audio content within the K guidance periods G (K is a natural number) from the reference speed (1 time) is out of a predetermined range, You may adjust the reproduction | regeneration speed | rate of the audio | voice content within the (K + 1) guidance period G which comes in the future.

This reduces the user's uncomfortable feeling by adjusting the playback speed in a distributed manner in a plurality of guidance periods G when there is a high possibility that the uncomfortable feeling will occur when the playback speed is adjusted only in the next guidance period G. it can. On the other hand, if possibly be adjusted playback speed just guiding period G next incoming uncomfortable feeling is small, an early stage the difference T _D between the target time M scheduled time E keep the 0 Can do.

  The above embodiment is an example for carrying out the present invention, and various other embodiments can be adopted. The travel planned route acquisition unit only needs to acquire the user's planned travel route, and the moving means (such as walking, bicycle, motorcycle, four-wheeled vehicle, public transportation, etc.) by which the user moves on the planned travel route is not particularly limited. The user may move on the moving route by combining a plurality of moving means. The audio content only needs to be reproduced in a manner that can be listened to by the user moving on the planned movement route, and may be reproduced by a reproduction device mounted on a vehicle such as a vehicle on which the user rides, May be played on a portable terminal. The planned movement route may be a route searched in advance by a known route search method, or may be a route searched by an external device via communication.

  The target time acquisition unit may acquire the target time based on the planned movement route, and may acquire the estimated arrival time of the waypoint or destination on the planned movement route as the target time. Further, the target time acquisition unit may acquire a time before the estimated arrival time for a predetermined period or a time after the estimated arrival time for a predetermined period as the target time. In other words, the playback may end at a timing before arriving at the destination, or the playback may end at a timing after arriving at the destination. The estimated arrival time may be dynamically predicted according to the current traffic information, the movement state of the user on the planned movement route, and the target time may be updated according to changes in the traffic information. Further, the estimated arrival time may be predicted anew when there is a change (reroute) in the planned travel route. The scheduled time acquisition unit may acquire the scheduled time when the audio content playback is scheduled to end, and may acquire the scheduled time by adding the playback time of the audio content scheduled to be played back to the current time. The audio content may be data for outputting a sound such as music or voice through a speaker during a predetermined reproduction period. The audio content may be one that reproduces sound alone or one that reproduces sound in synchronization with video.

  The adjustment unit only needs to adjust the playback speed of the audio content so as to reduce the difference (absolute value) between the target time and the scheduled time. If the scheduled time is later than the target time, the adjusting unit What is necessary is just to make content reproduction speed faster than a reference speed. On the other hand, when the scheduled time is earlier than the target time, the playback speed of the audio content may be set slower than the reference speed so that the scheduled time is delayed. To make the difference smaller is to make at least the difference smaller than the current difference. The difference may be set to 0, or the difference may be set to be equal to or less than a threshold value near 0. The reference speed may be a so-called single reproduction speed or a speed that can be set by the user. Further, the scheduled time at which the reproduction of the audio content ends is a time at which the reproduction ends when the audio content is reproduced at the reference speed.

  The guidance period is a period in which a voice for guiding the user so that the user can move on the planned travel route is output. For example, the user approaches a guide point on the planned travel route within a predetermined distance. In some cases, output of voice guidance may be started (a guidance period is started). The guide point may be a point set by the user on the planned travel route (via or destination), a branch point on the planned travel route, or the travel direction may be larger than a predetermined angle. It may be a point to be alerted, or it may be a point to call attention to alert the user to dangerous materials. The output of voice guidance may be started (a guidance period is started) when a predetermined period has elapsed since the start of movement on the planned movement route. The adjustment unit may acquire the length of the guidance period during which voice guidance is performed, and may adjust the playback speed based on the length of the guidance period. Of course, the adjustment unit may adjust the playback speed regardless of the length of the guidance period. For example, when the scheduled time is advanced, the adjustment unit may adjust the playback speed to a fixed speed (for example, 1.2 times the reference speed) larger than the reference speed. When the scheduled time is delayed, the adjustment unit may adjust the playback speed to a fixed speed (for example, 0.8 times the reference speed) that is lower than the reference speed. The adjustment unit may adjust the playback speed of the audio content in any period within the guidance period. For example, the adjustment unit adjusts the playback speed of the audio content in the period during which the sound pressure of the voice guidance is equal to or greater than a threshold value. May be.

  Further, the adjustment unit may adjust the playback speed of the audio content within the next guidance period so that the difference between the target time and the scheduled time becomes zero. Thereby, whenever the guidance period elapses, the difference between the target time and the scheduled time can be set to 0, and the difference between the target time and the scheduled time can be kept small. In addition, the next incoming guide period means one incoming guide period. Note that setting the difference to 0 includes setting the difference to a threshold value near 0 (for example, 0 to several tens of seconds) or less.

  Furthermore, the adjustment unit may adjust the reproduction speed of the audio content within a plurality of future guidance periods so that the difference between the target time and the scheduled time becomes zero. Thereby, the reproduction | regeneration period of audio | voice content can be adjusted disperse | distributing in each guidance period. Therefore, since the adjustment amount of the reproduction speed of the audio content in each guidance period can be reduced, the user's uncomfortable feeling can be reduced. Therefore, even when the difference between the target time and the scheduled time is large, the user's uncomfortable feeling can be reduced. For example, the adjustment unit may adjust the reproduction speed of the audio content within each guidance period so that the reproduction speed of the audio content within a plurality of guidance periods coming in the future becomes uniform.

  In addition, the adjustment unit adjusts the reproduction speed of the audio content within the next guidance period so that the difference between the target time and the scheduled time becomes zero, and the reproduction speed is out of a predetermined range. In this case, the playback speed of the audio content within a plurality of future guidance periods may be adjusted so that the difference between the target time and the scheduled time becomes zero. As a result, when there is a high possibility that an uncomfortable feeling will occur when the playback speed is adjusted only in the next guidance period, the user's uncomfortable feeling can be reduced by adjusting the playback speed distributed over a plurality of guidance periods. On the other hand, if the possibility of causing a sense of incongruity is small when the playback speed is adjusted only during the next guidance period, the difference between the target time and the scheduled time can be set to 0 early.

  Further, the adjusting unit may reproduce the audio content playback speed within the guidance period so as to reduce the difference between the target time and the scheduled time when the current time is closer to the target time than a predetermined reference. May be adjusted. Here, the longer the period until the target time, the greater the possibility that the planned travel route R cannot be moved as scheduled due to an unexpected event during the period, so that adjustments made earlier may not make sense. . By adjusting the playback speed of the audio content at a timing approaching the target time to some extent, it is possible to reduce the possibility of unnecessary adjustment. In addition, when the user's current position is within a predetermined distance with respect to a guide point such as a destination, the current time may be regarded as being closer to the target time than a predetermined reference.

  Furthermore, the method of adjusting the playback speed of audio content within the guidance period can also be applied as a program or method. In addition, the above-described sound reproduction control system, program, and method may be realized as a single sound reproduction control system or may be realized by using components shared with each part provided in the vehicle. Various embodiments are included. For example, it is possible to provide a navigation system, method, and program that include the above-described audio reproduction control system. Further, some changes may be made as appropriate, such as a part of software and a part of hardware. Furthermore, the present invention is also established as a recording medium for a program for controlling the audio reproduction control system. Of course, the software recording medium may be a magnetic recording medium, a magneto-optical recording medium, or any recording medium to be developed in the future.

  DESCRIPTION OF SYMBOLS 10 ... Navigation apparatus, 20 ... Control part, 21 ... Navigation program, 21a ... Planned movement acquisition module, 21b ... Target time acquisition module, 21c ... Planned time acquisition module, 21d ... Adjustment module, 21e ... Route guidance module, 30 ... Recording medium, 30a ... Map information, 30b ... Route information, 30c ... Voice content data, 30d ... Voice guidance data, 40 ... Position sensor, 41 ... Touch panel display, 42 ... Speaker, 43 ... Communication unit, E ... Scheduled time, G ... Guidance period, M ... Target time, N ... Current position, P1 to P3 ... Guidance point, R ... Scheduled movement route, W ... Guidance intersection

Claims (7)

A planned travel route acquisition unit for acquiring the planned travel route of the user;
A target time acquisition unit that acquires a target time, which is a target time for ending reproduction of audio content, based on the scheduled movement route;
A scheduled time acquisition unit that acquires a scheduled time that is a scheduled time at which reproduction of the audio content is scheduled to end;
An adjustment unit that adjusts the playback speed of the audio content so as to reduce the difference between the target time and the scheduled time within a guidance period in which voice guidance is performed for the planned travel route;
A voice reproduction control system comprising: The adjustment unit adjusts the playback speed of the audio content within the next guidance period so that a difference between the target time and the scheduled time becomes zero.
The audio reproduction control system according to claim 1. The adjustment unit adjusts the playback speed of the audio content within a plurality of the future guidance periods so that a difference between the target time and the scheduled time becomes zero.
The audio reproduction control system according to claim 1. The adjustment unit is
When the playback speed when the playback speed of the audio content is adjusted within the next guidance period so that the difference between the target time and the target time becomes 0 is out of a predetermined range. ,
Adjusting the playback speed of the audio content within the plurality of guidance periods coming in the future so that the difference between the target time and the target time becomes zero;
The audio reproduction control system according to claim 1. The adjustment unit is configured to reduce the difference between the target time and the scheduled time so as to reduce the difference between the target time and the scheduled time when the current time is closer to the target time than a predetermined reference. Adjust the playback speed of the content,
The audio | voice reproduction | regeneration control system as described in any one of Claims 1-4. Movement scheduled route acquiring unit, and as Engineering you get the movement scheduled route of the user,
Target time obtaining unit, on the basis of the movement scheduled route, Engineering and as you get a target time is the time of the target to end the reproduction of the audio content,
Estimated time of acquisition unit, and as engineering playback you get the scheduled time is the time of the plan to the end of the audio content,
Adjusting unit, in the guide period voice guidance for the movement scheduled route is performed, and as engineering you adjust the playback speed of the audio content so as to reduce the difference between the target time and the scheduled time,
An audio reproduction control method including: A planned travel route acquisition function for acquiring the planned travel route of the user;
A target time acquisition function for acquiring a target time, which is a target time for ending reproduction of audio content, based on the scheduled movement route;
A scheduled time acquisition function for acquiring a scheduled time that is a scheduled time at which the reproduction of the audio content is scheduled to end;
An adjustment function for adjusting the playback speed of the audio content so as to reduce the difference between the target time and the scheduled time within a guidance period in which voice guidance is performed for the planned travel route;
A sound reproduction control program for realizing a computer.

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