JP2010108184A - Onboard device and content reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent content including multimedia content from being reproduced after the end of an expiration date in an ITS onboard device. <P>SOLUTION: An onboard device which receives the distribution of content including prescribed multimedia content whose expiration date can be set from a road-side device includes a storage means for storing content distributed from the road-side device. This onboard device includes: a deletion inhibition means (S5 to S9) for inhibiting the deletion of the content stored in the storage means, that is, the content whose expiration date has ended, and the content including the prescribed multimedia content; and a registration means (S10 to S13) for registering a keyword related with the prescribed onboard device content included in the content whose deletion is inhibited by the deletion inhibition means with identification information specifying the content. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an in-vehicle device that receives content distribution from a roadside device, and a content reproduction method in the in-vehicle device.

  In recent years, an information providing service called town car life navigation using DSRC (Dedicated Short Range Communication) as communication media has been proposed. In this information provision service, content configured according to a data format called town car life navigation multi-content data format for ITS in-vehicle devices stipulated in the ITS in-vehicle device standard published by the Japan Electronics and Information Technology Industries Association, It is distributed via a roadside machine that supports the DSRC system.

Conventionally, the vehicle-mounted device can perform narrow area wireless communication with a roadside wireless device installed on the road using DSRC or the like, and can receive information from the center device via the roadside wireless device. . That is, bidirectional communication between the vehicle-mounted device of the vehicle and the roadside wireless device is possible only while the vehicle is within the communication range of the roadside wireless device. (Information on stores and medical institutions) and advertising information.

  Further, in the vehicle-mounted device, by storing various content information distributed from the roadside wireless device, it is possible to reproduce the various content information even in an environment where communication with the roadside wireless device is not possible (Patent Document 1). reference). In the conventional vehicle-mounted device, all distributed contents are reproduced under the same sound settings.

  In Patent Document 1, as a technique related to DSRC, a driver can set a method for storing information received from a roadside machine, thereby driving a desired one of received information. The technology regarding the vehicle-mounted device which the person can confirm again later is described.

JP 2007-109032 A

  However, according to the above-described conventional ITS in-vehicle device, it is arbitrary on the ITS in-vehicle device side whether or not to retain the distributed content even after the expiration date has expired. Of these, those whose expiration date has expired may be deleted or hidden. In this case, multimedia contents such as music and moving images included in the deleted or hidden contents cannot be reproduced. Also, content linked from deleted or non-displayed content cannot be played because the link is broken.

  An object of the present invention is to prevent the content including multimedia content from being unable to be played after the expiration date has expired in the ITS in-vehicle device in view of the problems of the related art.

  To achieve this object, an in-vehicle device according to a first aspect of the present invention is an in-vehicle device that receives distribution of content that can include multimedia content from a roadside device, and that receives content distributed from the roadside device. A storage unit for storing; a deletion prohibiting unit for prohibiting deletion of content stored in the storage unit that has expired and includes the multimedia content; Registration means for registering a keyword related to the multimedia content included in the content prohibited from being deleted by the deletion prohibiting means together with identification information for specifying the content. The multimedia content corresponds to, for example, an image file, an audio file, or a video file.

  The in-vehicle device according to a second aspect of the present invention is the vehicle-mounted device according to the first aspect, wherein the keyword registered by the registration unit is displayed, the selection unit accepts selection of any keyword, and the keyword selected by the selection unit. And reproducing means for reproducing the content specified by the corresponding identification information.

  A content reproduction method according to a third invention is a content reproduction method in an in-vehicle device that receives distribution of content that can include multimedia content from a roadside device, and stores the content that has been distributed from the roadside device as a storage device And a process of prohibiting deletion of content stored in the storage device that has expired and that includes the multimedia content. A registration step for registering a keyword relating to the multimedia content included in the content that has been processed by the prohibition step, together with identification information that identifies the content, and a keyword registered by the registration step Depending on the identification information corresponding to the selected Characterized by comprising a reproducing step of reproducing content to be constant.

  According to the present invention, it is possible to prevent content including multimedia content from being played back after the expiration date.

  FIG. 1 is a schematic diagram of a road-to-vehicle DSRC system 10 according to an embodiment of the present invention. The road-to-vehicle DSRC system 10 is used for an information providing service by a town car life navigation, and in the service, data in a town car life navigation multi-content format is used. The roadside machine 11 constitutes a roadside device 15 together with the server 12, and is connected to the server 12 by wire or wirelessly. Further, the server 12 can exchange data with another server via a network such as the Internet. The roadside device 11 transmits / receives data to / from the ITS vehicle-mounted device 17 mounted on the automobile 13 existing in an area having a diameter of approximately several meters to 30 meters using radio waves of 5.8 GHz band. The ITS vehicle-mounted device 17 includes a DSRC unit 18 and a navigation unit 19.

  FIG. 2 is an explanatory diagram of a data transmission mode. In the downlink of the multi-content format, data is classified according to its type, and ID codes (major category IDs) “00”, “01”, “02”,. In multi-content format data transmission, data is grouped in units of information groups, and each information group has classification data having an ID code “00” (hereinafter referred to as “ID = 00”) at the head. The classification data of ID = 00 is configuration information indicating what kind of ID is included in the information group.

  FIG. 3 is a diagram showing whether each ID is essential or optional for the configuration of the information group. ID = 0, 1, and 2 must be included in each information group. ID = 3, 4, and 5 do not need to be included in the information group when providing information only with ID = 60, but must be included in the information group when providing other information. Whether or not other IDs are included in the information group is arbitrary.

  4 to 7 are classification tables assigned to each ID used in the downlink. ID = 00 is a classification of configuration ID information (an area describing what ID each information group stores). ID = 01 is a classification of a business operator, a service business code (a business code that can identify a service business), a service business display text (a service business name (service name) text information for navigation display), And a service provider phonetic character string (service company name (service name) phonetic character string information for navigation utterance).

  ID = 02 is a content classification, and is a company code (a code that can identify the information provider of the content), a company display text (information providing company name text information for navigation display), a company phonetic character string (for navigation utterances) Information providing company name phonetic character string information), information code (information code that can identify the content), information display text (content content text information for navigation display), information phonetic character string (content content phonetic character string information for navigation utterances) ), And a preference data category (category code indicating an information category to which the information corresponds).

  Similar to ID = 02, ID = 03 is a content classification, and an immediate playback / storage code (a code representing a content playback operation after reception) and a playback condition code (content playback conditions in the information provision area) Code).

  ID = 04 is a classification of an expiration date, and includes a start year / month / day / hour / minute / second (content expiration date) and an end year / month / day / hour / minute / second (content expiration date). ID = 05 is a classification of provision time, and includes business hours (business hours of content provider) and information provision time (content provision time).

  ID = 10 is the classification of the target point, the target point coordinates (latitude and longitude information of the point where the service can be provided), the target point display text (service name (store name, etc.)), partner parking information (target Partner parking lot information other than location), icon display image data (icon data representing a place where service can be provided), display character data (text information for service description), display image data (still image information representing service) , Phonetic character string data (phonetic character string information indicating service), compressed voice data (compressed voice data information), voice playback order (representing the playback order of phonetic string and compressed voice), video data (video data) Information) and a URL (URL information representing a service).

  ID = 20 is a classification of information provision points. For a total of five information provision points, information provision center coordinates (latitude and longitude information for reproducing pop-up information) and information provision areas (areas for reproducing pop-up information) are provided. Radius information from central coordinates to be defined), information provision direction code (information provision direction information for reproducing pop-up information), information provision road type (road type information for reproducing pop-up information), display image data (still image for pop-up reproduction) Data), phonetic character string data (phonetic character string information for pop-up playback, compressed voice data for compressed voice data for pop-up playback), and voice playback order (a code representing the playback order of voice data for pop-up playback). .

  ID = 30 is a category of transition information, and includes a total of eight next reproduction information codes (screen transition information). ID = 40 is a classification of detailed information, and for each of the total 8 pieces of detailed information, display character data (navigation display detailed information text information) and utterance phonetic character string (navigation utterance detailed information) Phonetic character string information).

  ID = 50 is a classification of parking lot information, and for each of up to 15 parking lots, a parking lot ID (ID that can identify a parking lot), detailed information (dynamic detailed information on parking lot), and special notes Includes matters (special notes on parking).

  ID = 51 can update the static information of the parking lot stored in the navigation unit 19 for a maximum of 4 meshes in units of tertiary meshes. ID = 51 is the number of tertiary meshes (notifying the number of tertiary meshes including updated parking lot static information), and the tertiary mesh code (updating parking lot static information for each mesh of 1-4). 3rd mesh code included), 3rd mesh version information (3rd mesh version information including updated parking lot static information), 3rd mesh parking number (number of parking static information included in updated mesh) Includes tertiary mesh parking lot static information (static information of parking lot to be updated).

  ID = 60 is a classification of driving assistance, driving assistance image data (driving assistance image information), driving assistance phonetic character string (data driving assistance phonetic character string information), driving assistance compressed voice (data driving assistance compressed voice) Information) and voice playback order (representing the playback order of the phonetic character string and the compressed voice).

ID = 80 is a classification of preference data. For a total of 127 tables of preference data, preference data version (version information of preference data table), preference data table (
Preference data table display text information), phonetic character string (utterance phonetic character string information in preference data table), and detailed information (preference data table detailed information).

  FIG. 8 shows communication and processing between the devices performed in the transaction between the roadside device 15 and the ITS vehicle-mounted device 17. The roadside machine 11 and the server 12 constitute a roadside apparatus 15. The ITS vehicle-mounted device 17 includes a DSRC unit 18 and a navigation unit 19. Explain in chronological order. Communication between the roadside device 11 and the DSRC unit 18 is performed by DSRC radio waves, and communication between the roadside device 11 and the server 12 and between the DSRC unit 18 and the navigation unit 19 is usually performed by a cable.

  As the ITS vehicle-mounted device 17 is turned on, client information data is written from the navigation unit 19 to the DSRC unit 18 in S10. As the automobile 13 equipped with the ITS vehicle-mounted device 17 enters (area in) a radio wave arrival area within a communicable distance (eg, about 30 m) with the roadside device 11, in S11, the roadside device 11-DSRC unit 18 DSRC connection processing is performed between the two.

  When the DSRC connection process in S11 is completed, a DSRC connection notification is made in S12 and S13. The connection notification in S12 is from the roadside device 11 to the server 12, and the connection notification in S13 is from the DSRC unit 18 to the navigation unit 19. In S <b> 14, client information is notified from the DSRC unit 18 to the server 12 via the roadside device 11.

  The server 12 determines whether the user of the ITS vehicle-mounted device 17 is a member or a non-member based on the client information notification from the DSRC unit 18, and the hardware of the ITS vehicle-mounted device 17 for appropriately reproducing the content by the ITS vehicle-mounted device 17. Know the wear information. In S <b> 18, content such as a Welcom screen is transmitted from the server 12 to the navigation unit 19 via the roadside device 11 and the DSRC unit 18. The content is organized in a multi-content format. The navigation unit 19 determines a service provider from the multi-content format.

  After S18, the server 12 periodically polls the DSRC unit 18 in S19 until the navigation unit 19 writes the uplink information in the DSRC unit 18. In S20, the navigation unit 19 writes the uplink information to the DSRC unit 18 if it is a member of the service provider, but does nothing if it is not a member.

  In S <b> 24, the server 12 sends default content (e.g., a welcome screen) to the navigation unit 19 via the roadside device 11 and the DSRC unit 18. In S <b> 29, the server 12 performs memory access polling for the DSRC unit 18. On the other hand, in S30, if the user is a member, the DSRC unit 18 notifies the server 12 of uplink information.

  In S33, the server 12 organizes the storage-type content suitable for the member preference based on the member information acquired from the uplink information in the multi-content format (FIG. 2) and distributes it to the ITS in-vehicle device 17. As will be described later, the roadside device 15 interrupts the distribution of the accumulation type content one or more times during the period of S33 and interrupts the distribution of the immediate reproduction type content. In S34, the end of distribution of the storage type content is notified. The automobile 13 equipped with the ITS vehicle-mounted device 17 leaves the communication area with the roadside device 11 with the end of distribution.

  FIG. 9 is a data explanatory diagram of uplink information sent from the ITS vehicle-mounted device 17 to the roadside device 15. Uplink information is sent in multiple tags. The tag 1 includes a service provider code, a destination (latitude and longitude), a waypoint (latitude and longitude) 1 to 5, a cumulative travel distance, a preference genre data version, preference genre data, and member information 1 to 8. The tag 2 includes a service provider code and past stopover locations (latitude and longitude) 1 to 41. The tag 3 includes a service provider code and past stopover places (latitude and longitude) 42 to 82.

  The tag 4 includes a service provider code and reception / reproduction history (reception information code and reproduction identification flag) 1 to 123. The tag 5 includes a service provider code and reception / reproduction history (reception information code and reproduction identification flag) 124 to 246.

  FIG. 10 is an explanatory diagram showing an example of preference data with ID = 80 as a table. The preference data includes a preference data number, preference data display text, preference data display nest, preference data target identifier, preference data default value, and phonogram string. There are a total of 128 preference data numbers ranging from 0 to 127, and the service provider can freely set items for each data number. Of the 128 items, a maximum of 96 items are notified as uplink information from the ITS in-vehicle device 17 to the roadside device 15 in S30 (FIG. 4).

  Of the 96 items notified as uplink information, 12 items are used for public information providing service purposes and are information items distributed by default when providing information in DSRC communication. In the preference data table of FIG. 10, the display nest means a hierarchy of each item (corresponding to the data number of FIG. 10), and a larger numerical value means a lower hierarchy. The target identifier means that an item whose value is “0” is not a check target in the preference data check screen (FIG. 11 described later) in the navigation unit 19, and is “1”. This means that the item is a check target on the check screen. The default value means that an item with “0” is displayed on the initial screen with no check, and an item with “1” is displayed on the initial screen with check. It means to display with check.

  FIG. 11 is an example of a check screen that the ITS vehicle-mounted device 17 that has received the preference data from the roadside device 15 displays on the display unit of the navigation unit 19. The user can scroll the screen up and down by dragging the scroll bar 23. In FIG. 11, when the user clicks the on button, the check is added, and when the user clicks the off button, the check is removed. In each item, it means that the user has selected one of “ON” and “OFF” whose italic font is italic. Items for which the default value of the received preference data is “0” (eg, bargain information and coupon information in FIG. 10) are off (unchecked), and the default value of the received preference data is “1”. The item (example: parking lot information in FIG. 10) is on (checked).

  FIG. 12 is a block diagram showing the configuration of the roadside machine 11. As shown in the figure, the roadside machine 11 performs necessary processing, a control unit 111 that controls each part of the roadside machine 11, a ROM 112 that stores programs executed by the control unit 111, a RAM 113 that is used by the control unit 111, A storage device 114 used as an auxiliary storage device by the control unit 111, a wireless communication unit 115 for the control unit 111 to perform DSRC communication with the ITS in-vehicle device 17, and an ITS communication with the server 12 by the control unit 111 A communication control unit 116 for performing communication via the network (intelligent transportation system communication network) 20 is provided.

  FIG. 13 is a block diagram showing a configuration of the ITS vehicle-mounted device 17. As shown in the figure, the ITS vehicle-mounted device 17 performs necessary processing, a control unit 171 that controls each unit of the ITS vehicle-mounted device 17, a ROM 172 that stores programs executed by the control unit 171, and the control unit 171 perform processing. The RAM 173 used in the process, the storage device 174 used by the control unit 171 as an auxiliary storage device, the communication unit 175 for the control unit 171 to perform wireless communication, and the operation unit 176 for giving an instruction to the control unit 171 by an operation input. A display unit 177 for displaying information to be notified to the user by the control unit 171; a microphone 178 for the user to give an instruction to the control unit 171 by voice input; and a control unit 171 by voice output to the user. The speaker 179, the microphone 178 and the speaker 179 for notifying information are interposed between the control unit 171 and the voice recognition. Comprising an audio processing unit 180 performs processing such as speech synthesis, as well as a control unit 171, interposed between the sensor group 181, the output device 182 to pass the output from the sensor group 181 to the control unit 171.

  The communication unit 175 includes a GPS module 175 a that receives a radio wave transmitted from a GPS satellite, executes positioning calculation, and outputs positioning information, and a DSRC module for performing DSRC communication with the roadside device 111. The sensor group 181 includes a vehicle speed sensor, a gyro sensor, a parking sensor, and the like. The control unit 171 refers to the map database stored in the storage device 174, and also performs a navigation function based on information from the GPS module 175a and the sensor group 181.

  FIG. 14 shows a format of “item presence / absence information” included in the “target point information” (ID = 10) of the content to be distributed by the ITS in-vehicle device 17. “Item presence / absence information” is information indicating whether or not each item that can be set in “target point information” is set. As shown in the figure, “target location information” includes “partner parking lot”, “URL”, “video”, “compressed voice”, “phonetic character string”, “display image”, “display character”. "," Target point ", and" icon "can be set, and" item presence / absence information "indicates the presence / absence of setting for these items. That is, for each data, if the “presence / absence flag” is “0”, that data is not set, and if it is “1”, it is set.

  When the “presence flag” (hereinafter referred to as “multimedia flag”) for the item “multimedia” is “1”, it means that the “target point information” includes a multimedia file. However, only when ID = 10 and the multimedia flag is “1”, the “display image” is the jacket photo of the music CD, the “compressed sound” is the song, and the “display character” is the artist name. And a song name. Alternatively, “display image” is a thumbnail of “video”, “video” is a moving image such as PV (promotion video), and “display characters” indicate an artist name and a song name. In this case, the multimedia file includes an image file composed of "display image" data, an audio file composed of "compressed audio" data, and a video file composed of "video" data. Applicable.

  The data format of “display image” corresponds to JPG, GIF, PNG, and BMP. The data format of “compressed audio” corresponds to IMA-ADPCM, MP3, AAC, CELP, and PCM. As a data format of “video”, MPEG-4, WMV, MOV, and Flash are applicable.

  FIG. 15 shows an example of a content screen displayed on the display unit 177 of the ITS vehicle-mounted device 17. 141 is a portion displayed based on “display image data” in “target point information” (ID = 10) of the content, 142 is “next” in “transition information” (ID = 30) of the content. This is a transition button generated based on “reproduction information code 1” to “next reproduction information code 8”. Up to eight “information codes” (ID = 02) of contents that can be reproduced next to the content can be set in “next reproduction information code 1” to “next reproduction information code 8”. That is, since content exists for each “information code”, the content to be reproduced next is also specified by the “information code”. The number of “next playback information code 1” to “next playback information code 8” in which “information code” is set in the transition button 142 and the content specified by the “information code” exists in the storage device 174 Only the numbers “1”, “2”,... In the example of FIG. 15, since “information code” is set from “next reproduction information code 1” to “next reproduction information code 4” and the corresponding content exists, the numbers “1” to “4” are assigned. Four attached transition buttons 142 are displayed.

  “1. Living information”, “2. Store information”, “3. Roadside service”, and “4. Parking lot guidance” displayed in the display portion 141 are “1” to “1”, respectively. It shows an outline of the next content to be played when each transition button 142 with the number “4” is pressed. In other words, “display image data” (ID = 10) and “next reproduction information code 1” to “next reproduction information code 8” (in this way, so that the display content of the display portion 141 and each transition button 142 correspond to each other in this way. ID = 30) is set in the content.

  When any of the transition buttons 142 is pressed, the ITS vehicle-mounted device 17 has the same “setting content” as one of “next playback information code 1” to “next playback information code 4” corresponding to the transition button 142. The content having “information code” (ID = 02) is searched and the content is reproduced. That is, if “display image data” and “transition information” (ID = 30) in the “target point information” (ID = 10) of the searched content are set, the screen transitions to a screen based on these setting contents. To do. In this way, each content can be reproduced while sequentially changing the content screen in accordance with the setting content of “transition information” (ID = 30). At this time, if the multimedia flag of the content to be reproduced is “1”, a musical sound is reproduced based on “compressed audio data” (ID = 10), or based on “video data” (ID = 10). The video will be played.

  The ITS in-vehicle device 17 receives the distribution and deletes the content stored in the storage device 174 if the multimedia flag is “1” even if the expiration date has expired. I'm trying to save it. At that time, the artist name and the song name set as “display character data” in the “target point information” (ID = 10) of the content are registered as keywords so that the content can be reproduced. In association with this, the “information code” in “information provider company information” (ID = 02) is registered as identification information for specifying the content. Registration is performed in a skewer search keyword table provided in the storage device 174.

  FIG. 16 shows this skewered search keyword table. Each record of this table is composed of items of “information code” and corresponding “keyword” as shown in FIG. As described above, the information code for specifying the content corresponding to the record is recorded in the “information code”, and the artist name and the song name set for the content are recorded in the “keyword”.

  FIG. 17 is a flowchart showing a registration process to the skewer search keyword table in the ITS in-vehicle device 17. This process is periodically performed at a predetermined timing. When the process is started, the ITS vehicle-mounted device 17 first sets the number of contents stored in the storage device 174 for the variable C in step S1. Next, “1” is set to the counter N in step S2. Next, in step S3, the current time is acquired. Next, in step S4, it is determined whether or not the counter N is equal to or smaller than the variable C.

  If it is determined that the value is equal to or less than the variable C, the process proceeds to step S5, and the expiration date of the Nth content is acquired. Next, in step S6, the expiration date is compared with the current time to determine whether or not the expiration date of the Nth content has expired. If it is determined that the expiration date has not expired, the process proceeds to step S14. If it is determined that the expiration date has expired, the process proceeds to step S7, where “item presence / absence information” (FIG. 14) in “target point information” (ID = 10) in the Nth content is extracted.

  Next, in step S8, it is determined whether or not the multimedia flag in the “item presence / absence information” is “1”. If it is determined that it is not “1”, the process proceeds to step S14. If it is determined to be “1”, the process proceeds to step S9, and the deletion prohibition management flag of the Nth content is set to “1”. The deletion prohibition management flag indicates whether or not deletion is prohibited for the content provided with the flag. If “1”, deletion is prohibited, and if “0”, deletion is prohibited. Means not. When the deletion prohibition management flag is set to “1”, the content is not deleted unless there is an instruction from the user thereafter. This flag can be provided in a predetermined empty area in the content.

  Next, in step S10, the “information code” in the “information providing company information” (ID = 02) of the Nth content is extracted. Next, in step S11, “display character data” in “target point information” (ID = 10) of the Nth content is extracted. Next, in step S12, an artist name and a song name are extracted from the “display character data”. Next, in step S13, the contents of the extracted “information code”, the artist name, and the song name are registered as items of “information code” and “keyword” in the skewer search keyword table, respectively, and the process proceeds to step S14.

  In step S14, the counter N is incremented, and the process returns to step S4. If it is determined in step S4 that the counter N is not less than or equal to the variable C, the processing in FIG. By periodically performing the above processing, deletion of content whose multimedia flag is “1” that has been newly determined to have expired at each processing point is prohibited, and for skewered retrieval Additional registration in the keyword table will be made.

  FIG. 18 is a flowchart showing content reproduction processing by skew search in the ITS in-vehicle device 17. When the process is started in response to a predetermined instruction from the user, the ITS in-vehicle device 17 first sets, in step S21, the number of keywords for skewering search, that is, the number of records registered in the skewered search keyword table as a variable D. Set to. Next, “1” is set to the counter N in step S22. Next, in steps S23 to S25, a content selection screen for skewering search is displayed on the display unit 177. That is, while the counter N is incremented in step S25 until the counter N exceeds the variable D in step S23, the keyword in the Nth record in the skew search keyword table and the corresponding selection button are displayed in step S24.

  FIG. 19 shows a content selection screen displayed in this way. In the figure, 191 is a selection button, and 192 is a keyword indicating the contents of content to be reproduced when each selection button 191 is pressed. The selection button 191 and the keyword 192 are displayed in step S24. The keyword 192 is composed of an artist name and a song name as described above. The user can select a desired keyword 192 by pressing any one of the selection buttons 191 and reproduce the corresponding content.

  Returning to FIG. 18, next, in step S <b> 26, the process waits for a keyword to be selected by pressing one of the selection buttons 191. When a keyword is selected, the process proceeds to step S27 and the content selection screen is deleted. Next, in step S28, the content specified by the information code in the skewer search keyword table corresponding to the selected keyword is reproduced. This content includes multimedia content, and the corresponding musical sound and video are played back. Thereafter, the process of FIG. 18 is terminated.

  According to the present embodiment, content whose multimedia flag is “1” whose expiration date has expired is retained without being deleted, registered in the skewer search keyword table, and content for skewer search. Since reproduction can be performed by selecting from the selection screen, it is possible to prevent such content from being unable to be reproduced.

  Note that the present invention is not limited to the above-described embodiment, and can be implemented with appropriate modifications. For example, in the above description, in step S9 in FIG. 17, as a measure for prohibiting the deletion of the content including the multimedia content, the deletion prohibition management flag of the content is set to “1”. Instead of this, a table for registering whether or not each content can be deleted may be provided in an area other than the content data area, and this table may be used to manage whether or not each content can be deleted. Alternatively, the table of FIG. 16 may be used, and content registered in this table may be regarded as being prohibited from being deleted.

  In the above description, the artist name and the song name included in the “display character data” in the “target point information” (ID = 10) are registered as keywords for the content whose multimedia flag is “1”. However, instead of this, an artist name, a song name, or a genre name included in tag information of a multimedia file that can be extracted from the content may be registered as a keyword.

1 is a schematic diagram of a road-to-vehicle DSRC system according to an embodiment of the present invention. It is explanatory drawing of the data transmission aspect of a town car life navi multi-content format. It is a figure which shows whether each ID is essential or arbitrary about the structure of the information group in town car life navi multi-content data. It is a classification table which shows the content allocated to each ID of town car life navigation multi-content data. It is a figure which shows the continuation of the table | surface of FIG. It is a figure which shows the continuation of the table | surface of FIG. It is a figure which shows the continuation of the table | surface of FIG. It is a figure which shows the communication and process between each apparatus implemented by the transaction between a roadside apparatus and ITS onboard equipment. It is data explanatory drawing of the uplink information sent to a roadside apparatus from ITS onboard equipment. It is explanatory drawing which represented in table form an example of the preference data of ID = 80 in town car life navi multi-content data. It is a figure which shows an example of the screen of the check which the ITS onboard equipment which received preference data from the roadside apparatus displays on the display of a navigation part. It is a block diagram which shows the structure of the roadside machine in the system of FIG. It is a block diagram which shows the structure of the ITS onboard equipment in the system of FIG. It is a figure which shows the format of the "item presence information" contained in the "target point information" (ID = 10) in town car life navigation multi-content data. It is a figure which shows an example of the content screen displayed in the ITS onboard equipment of FIG. It is a figure which shows the skewer search keyword table in the ITS onboard equipment of FIG. It is a flowchart which shows the registration process to the keyword table for skewering searches in the ITS onboard equipment of FIG. It is a flowchart which shows the content reproduction | regeneration process by the skewering search in the ITS onboard equipment of FIG. It is a figure which shows the content selection screen displayed in the process of FIG.

Explanation of symbols

  10: Road-to-vehicle DSRC system, 11: Roadside machine, 12: Server, 13: Automobile, 17: ITS on-board unit, 18: DSRC unit, 19: Navigation unit, 20: ITS communication network, 23: Scroll bar, 111: Control Part: 112: ROM, 113: RAM, 114: storage device, 115: wireless communication part, 116: communication control part, 141: display part, 142: transition button, 171: control part, 172: ROM, 173: RAM, 174: Storage device, 175: Communication unit, 175a: GPS module, 175b: DSRC module, 176: Operation unit, 177: Display unit, 178: Microphone, 179: Speaker, 180: Audio processing unit, 181: Sensor group, 182 : Input / output device, 191: selection button, 192: keyword.

Claims (3)

An in-vehicle device that receives distribution of content that can include multimedia content from a roadside device,
Storage means for accumulating content received from the roadside device;
Deletion prohibiting means for prohibiting deletion of contents stored in the storage means that have expired and include the multimedia content;
An in-vehicle apparatus, comprising: a registration unit that registers a keyword related to the multimedia content included in the content prohibited from being deleted by the deletion prohibiting unit together with identification information for specifying the content. A selection means for displaying the keyword registered by the registration means and accepting the selection of any one of the keywords;
The in-vehicle device according to claim 1, further comprising: a reproducing unit that reproduces the content specified by the identification information corresponding to the keyword selected by the selecting unit. A content playback method in an in-vehicle device that receives distribution of content that can include multimedia content from a roadside device,
An accumulation step of accumulating content received from the roadside device in a storage device;
Deletion prohibiting step for performing processing for prohibiting deletion of content stored in the storage device that has expired and includes the multimedia content;
A registration step of registering a keyword related to the multimedia content included in the content that has been processed by the deletion prohibiting step, together with identification information that identifies the content;
A content reproduction method comprising: a reproduction step of reproducing a content specified by identification information corresponding to a selected keyword registered in the registration step.

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