JP4632141B2 - Broadcast data playback device - Google Patents

Description

  The present invention relates to a broadcast data reproducing apparatus, for example, an apparatus for receiving, storing and reproducing broadcast data of terrestrial digital broadcasting.

For example, broadcast data is received by a vehicle and stored, or reproduced and displayed together with the storage.
In particular, with the start of digital terrestrial broadcasting in recent years, each of Patent Documents 1 to 3 proposes a technique for recording and reproducing and displaying a digital broadcast with a clear image using a vehicle.
JP 2001-94897 A JP 2006-54538 A JP-A-2005-184316

However, in the techniques described in Patent Documents 1 and 2, the broadcast data is stored (recorded) or reproduced in the vehicle while passing through a radio wave non-interval section where the broadcast data cannot be received, such as a tunnel. I can't.
On the other hand, in the technique described in Patent Document 3, when it is difficult to receive a program reserved for viewing or recording, reservation data is transmitted to a home program recording / playback server and recorded by the program recording / playback server. The program reserved later can be viewed.
However, in the technique described in Patent Document 3, the video is recorded on the home program recording / playback server, but cannot be recorded on the broadcast data playback device in the vehicle, and the recorded data is played back almost in real time in the vehicle. I couldn't.

Accordingly, a first object of the present invention is to store broadcast data in a vehicle regardless of whether or not there is a radio wave non-intersection.
A second object is to continuously reproduce broadcast data in a vehicle without significant time delay regardless of whether or not there is a radio wave interruption section.

(1) In the first aspect of the present invention, the first broadcast data receiving means for receiving the broadcast data, the inter-vehicle communication means for transmitting / receiving data to / from other vehicles, and the passage through the radio wave non-interval section can be received. Broadcast data received by the first broadcast data receiving means, second broadcast data receiving means for receiving broadcast data that has not been received from another vehicle by inter-vehicle communication by the inter-vehicle communication means, and receiving the second broadcast data Broadcast data storage means for storing the broadcast data received by the means, reproduction means for continuously reproducing the broadcast data stored in the broadcast data storage means, travel route acquisition means for acquiring a travel route, and the travel route A non-interruptible section acquiring means for acquiring a radio non-interruptible section where the broadcast data cannot be received, and calculating a passing time of each of the acquired radio non-communication sections; And a reproduction means for reproducing the stored broadcast data after the broadcast data for at least the maximum interruption time is received by the first broadcast data reception means. The broadcast data reproducing apparatus is characterized by starting the broadcasting.
( 2 ) The invention according to claim 2 , further comprising traffic information acquisition means for acquiring traffic information, wherein the maximum non-communication time determination means calculates a transit time based on a distance of each radio wave non-interval section and traffic information in the section. The broadcast data reproducing apparatus according to claim 1 is provided.

According to the first aspect of the present invention, broadcast data that could not be received due to passage through the radio wave non-interval section is received from another vehicle by inter-vehicle communication by the vehicle-to-vehicle communication means. Data can be stored in the vehicle. In addition, since the first broadcast data receiving means receives the broadcast data for the maximum disconnection time, which is the maximum time during which radio waves cannot be received, the stored broadcast data starts to be reproduced. Can be played without interruption.
According to the second aspect of the present invention, since the passage time is calculated based on the distance between each radio wave non-communication section and the traffic information in the section, a more accurate passage time can be used.

Hereinafter, a preferred embodiment of the broadcast data reproducing apparatus of the present invention will be described in detail with reference to FIGS.
(1) Outline of Embodiment The broadcast data reproduction apparatus of the present embodiment continuously reproduces broadcast data, for example, broadcast data of terrestrial digital broadcast, almost continuously in real time. This almost real-time reproduction refers to reproduction with a delay of a predetermined time, and the predetermined time is the maximum value (maximum non-communication time T) of the passage times (non-communication time) of each radio wave non-existing section existing on the planned travel route. Or, it means a time T2 (= T + α) obtained by adding a margin time α to the maximum interruption time T.
The radio wave interruption section is a section in which broadcast data such as a shadow of a tunnel or a building cannot be received, and is stored in the radio wave intensity map database.
The non-communication time, which is the passage time of each non-communication section, is calculated more accurately by receiving traffic information such as traffic jam information.

When an instruction to receive a desired broadcast or reservation is made, all radio wave non-existing sections existing on the travel route are extracted from the radio wave intensity map database. Then, the traffic information is received, the non-communication time for each radio wave non-interval section is calculated, and the maximum value is set as the maximum non-communication time T.
Then, the broadcast data is received simultaneously with the start of the reserved broadcast, and the sequentially received broadcast data is stored. Then, the maximum interruption time T is set as the storage time T, and when the broadcast data corresponding to the storage time T is received, that is, the stored broadcast data is started to be played back after the start of the broadcast to be recorded by the storage time T. .
Broadcast data broadcast while traveling in a radio wave non-communication section is received and reproduced by inter-vehicle communication from other vehicles that have received and stored the broadcast data during and / or during the passage of the section. Thus, the broadcast can be reproduced without interruption. Broadcast data received by inter-vehicle communication is stored so as to be continuous with broadcast data received by the host vehicle.

  As described above, in the broadcast data reproducing apparatus of the present embodiment, reproduction is delayed by the maximum non-communication time T, so that broadcast data for the maximum non-communication time T is always stored immediately before passing through each radio wave non-communication section. Yes. For this reason, even if the own vehicle cannot receive and store broadcast data in real time when passing through the radio wave non-communication zone, the radio wave non-interval zone can reproduce only the maximum non-communication time T by reproducing the stored broadcast data. Broadcast data can be continuously played back in near real time due to the delay.

(2) Details of Embodiment FIG. 1 shows a configuration of a broadcast data reproducing apparatus.
The broadcast data reproducing apparatus includes a central processing unit 11.
The central processing unit 11 includes a GPS receiver 13, an input device 14, an audio output device 15, a hard disk 16, a radio wave intensity map database 17, an RF receiver 18, and a radio wave intensity monitoring circuit 19 via a bus line 12 such as a data bus. A monitor 20, a receiver 21, a transceiver 22, and other devices are connected.

The central processing unit 11 is configured by a computer system including a CPU, a ROM, and a RAM, and performs various processes related to reception and reproduction of broadcast data in the present embodiment in accordance with various programs and data stored in the hard disk 16 and ROM. .
The central processing unit 11 has a built-in clock, and is used for monitoring the start time of broadcast data for which a reservation or reproduction instruction has been given.

The GPS receiver 13 is for outputting the current position data of the vehicle by longitude and latitude. The GPS receiver 13 includes a GPS receiver that receives signals from a plurality of GPS satellites and measures the absolute position of the user.
The GPS receiver 13 functions as a vehicle position acquisition unit that measures the current position of the vehicle. In addition to or instead of the GPS receiver 13, the vehicle position acquisition means may include a geomagnetic sensor, a gyro sensor, a vehicle speed sensor, and the like that detect the geomagnetism and determine the direction of the vehicle.

The input device 14 is a device for inputting information required for destination input, broadcast data recording reservation, reproduction reservation, and the like.
As the input device 14, various devices such as a touch panel (functioning as a switch), a keyboard, a mouse, a light pen, a joystick, an infrared remote control, a touch panel attached to the display screen of the monitor 20, a remote control, and a voice recognition device can be used. It constitutes an input means for inputting various information.
In the present embodiment, the travel route (route) to the destination is calculated in the broadcast storage time calculation process described later. For the processing of setting the destination and searching for the travel route to the destination, the vehicle In this case, the input device 14 may also be used as an input device provided on the operation panel of the navigation device.

  The audio output device 15 includes a plurality of speakers and an audio control device arranged in the vehicle. The voice output device 15 outputs the voice for the voice guidance guide for receiving the broadcast controlled by the voice control unit and the purpose input and the received broadcast data from the speaker.

The hard disk 16 stores terrestrial digital broadcast 181 broadcast data received from the RF receiver 18 and the transmitter / receiver 22, and traffic information 211 received from the receiver 21.
The hard disk 16 also stores map data in addition to data for searching for travel routes such as destination data and road data. Further, various programs and data such as a broadcast receiving program and a navigation program according to the present embodiment are stored.

The radio wave intensity map database 17 stores radio wave non-interval sections where terrestrial digital broadcasting cannot be received.
This radio wave non-interval section stores section data corresponding to road data used for route search. That is, the road data is composed of nodes indicating points on the road and links connecting the nodes, and each node and link is assigned a node number and a link number. The link number corresponding to the section is specified.
In addition, the radio wave non-interval section stored in the radio wave intensity map database 17 is defined for a section where the radio wave of digital terrestrial broadcasting cannot be received at all times, but there are also radio waves that may not be received depending on conditions such as weather. The unstable section may be included in the radio wave non-communication section and stored. In this case, you may make it preserve | save by distinguishing a radio wave interruption area and a radio wave unstable area always.
In addition, about the radio wave interruption section, the radio wave reception state by the own vehicle is constantly monitored and updated.

An RF (Radio Frequency) receiver 18 is a receiver that receives broadcast data from the terrestrial digital broadcast 181.
The radio wave intensity monitoring circuit 19 is a monitoring circuit that detects the intensity of radio waves received by the RF receiver 18 (received radio waves of broadcast data). That is, it is detected whether or not the received radio wave has an intensity level at which broadcast data can be reproduced.

The monitor 20 displays an image based on the broadcast data received by the terrestrial digital broadcast.
Further, the monitor 20 displays input information such as a destination and a broadcast reservation by the input device 14, displays information necessary for the input operation, or a map around the current vehicle location when the monitor 20 is also used as a navigation device. And travel route, current vehicle position, etc. are displayed.
The monitor 20 includes a liquid crystal display, a plasma display, a CRT display, and the like. In some cases, the display surface may include a touch panel constituting the input device 14.

The receiver 21 receives traffic information 211 such as traffic jam information and traffic accident information including a traffic jam section and a traffic jam level from a traffic information center.
The receiver 21 in the present embodiment is configured to receive the traffic information 211 at all times, but may receive the information every predetermined process. Examples of the predetermined process include a case where a broadcast reservation is input, a search for a travel route to a destination, a start of travel on the searched travel route, and a travel on the searched travel route.

  The transmitter / receiver 22 is a transmitter / receiver for performing inter-vehicle communication 221 with other vehicles through a wireless communication line, and is configured by a wireless LAN communication device. A local network is formed with another vehicle via the transceiver 22, and broadcast data of the terrestrial digital broadcast 181 broadcast while traveling in the radio wave non-interval section is received. The transceiver 22 transmits a network connection request and corresponding broadcast data request to the other vehicle, and receives the network connection permission and the broadcast data from the other vehicle.

The inter-vehicle communication by the transmitter / receiver 22 of the present embodiment uses, for example, a wireless LAN communication system based on a spread spectrum communication system. For example, a one-to-n relationship by broadcast or multicast having a radius of 200 m to 1 km as a communicable area. A local network is formed with other vehicles by adopting a communication form of (n is a plurality).
On the other hand, between other vehicles forming a network, a request for necessary broadcast data and corresponding broadcast data are transmitted by one-to-one type communication by unicast designating an IP address.
In addition, when the other vehicle transmits the requested broadcast data, unicast communication specifying the IP address included in the received request is performed.
However, the inter-vehicle communication method is not limited to the above example, and other communication methods may be used.

Each process of storing and reproducing broadcast data by the broadcast data reproducing apparatus according to the present embodiment configured as described above will be described.
FIG. 2 conceptually shows a broadcast data reception and playback schedule in a host vehicle (hereinafter simply referred to as host vehicle) equipped with a broadcast data playback apparatus.
FIG. 2A shows a broadcast schedule by terrestrial digital broadcasting, and broadcast data is displayed as 1, 2, 3,... For easy understanding.
FIG. 2B shows a travel route from the departure place to the destination where the host vehicle travels, and radio wave non-interval sections A, B,... Existing on the travel route.
FIG. 2C shows a broadcast data reception schedule by the own vehicle, and FIG. 2D shows a broadcast data reproduction schedule by the own vehicle.
2 (e) shows another vehicle A that has received broadcast data without passing through the radio wave non-interval section A, and FIG. 2 (f) shows another vehicle B that has received broadcast data without passing through the non-radio wave section B. It shows a schedule for data reception and the own vehicle acquiring broadcast data from both vehicles.

Broadcast saving time calculation processing is performed when an instruction to save or receive (reproduce) broadcast data is made or reserved in the host vehicle. In the example of FIG. 2, a case where a reproduction instruction and a reservation are made from the broadcast data 1 is displayed.
FIG. 3 is a flowchart showing the broadcast storage time calculation process. This broadcast storage time calculation process is a process of calculating a maximum non-interruption time T for delaying playback from the broadcast time in order to continuously play the broadcast data without interruption.

The central processing unit 11 acquires the traffic information received by the receiver 21 (step 20). The traffic information to be acquired includes a traffic jam section, the level of the traffic jam (travel speed of the section, time required for travel, etc.), accident information, and the like.
When the receiver 21 constantly receives the traffic information and saves the reception result in the hard disk 16, the traffic information is acquired in the hard disk 16 and stored in the RAM. On the other hand, if not always received, the central processing unit 11 receives (acquires) the traffic information 221 via the receiver 21 and stores it in the RAM and also stores it in the hard disk 16.
Either step 20 or next step 21 may be processed first, or may be processed in parallel.

Next, the central processing unit 11 acquires a travel route to the destination by searching for a travel route from the current vehicle position to the destination (route calculation) (step 21: travel route acquisition means).
In the case of a vehicle equipped with a navigation device or a navigation function, the central processing unit 11 requests the navigation device / function to search for a route to the set destination and set the destination in step 21, and is searched. A travel route may be acquired.
In addition, the information center searches for a travel route to the destination by transmitting the departure point or the current location and the destination by communication with the information center, and obtains the searched travel route by receiving it from the information center. May be.

Next, the central processing unit 11 calculates the radio wave breakage time on the acquired travel route (step 22).
That is, the central processing unit 11 specifies the radio wave non-interval sections A, B... (FIG. 2B) existing on the acquired travel route from the radio wave intensity map database 17. Then, passage times TA, TB,... Required for traveling through the specified radio wave non-communication sections A, B,. The calculation of the passing time uses the traffic information acquired in step 20 (such as the traveling speed of the traffic jam section) to calculate a more accurate time.

The central processing unit 11 stores the maximum passage time of the calculated passage times TA, TB,... In the RAM as the maximum passage time T, and ends the processing (step 23).
In the example shown in FIG. 2, the passage time TA of the radio wave non-communication section A is the maximum non-transmission time T, which corresponds to the time for four frames of broadcast data.

Next, the operation of receiving broadcast data by the broadcast data reproducing apparatus will be described. The reception of the broadcast data starts when the designated or reserved broadcast time comes.
FIG. 4 is a flowchart showing the broadcast data receiving operation.
When the broadcast to be received is started, the central processing unit 11 sets the maximum non-communication time T in the RAM as the storage time T (step 40), and the broadcast data 1, 2,. And stored in a predetermined area of the hard disk 16 (step 41).

The central processing unit 11 determines whether or not the set storage time T has expired (step 42). If the storage time has not expired (step 42; N), the central processing unit 11 determines whether or not the radio wave intensity received by the RF receiver 18 is sufficient by the radio wave intensity monitoring circuit 19 (step 43). ).
If the radio field intensity is sufficient (step 43; Y), the process returns to step 41 and continues to receive and store the broadcast data until the storage time T ends (storage time T minutes).
In the example of FIG. 2, as shown in the reception schedule of the host vehicle in (d), four frames of broadcast data 1 to 4 corresponding to the storage time T (maximum disconnection time T) are sequentially received and stored in the hard disk 16. To do.

When an instruction to receive a desired broadcast or a reservation is made, all radio wave non-existing sections existing on the travel route are extracted from the radio wave intensity map database 17. Then, the traffic information is received, the non-communication time for each radio wave non-interval section is calculated, and the maximum value is set as the maximum non-communication time T.
Then, the broadcast data is received simultaneously with the start of the reserved broadcast, and the sequentially received broadcast data is stored. Then, when broadcast data for only the maximum non-communication time T is received, reproduction of the stored broadcast data is started.
Broadcast data broadcast while traveling in a radio wave non-communication section is received and reproduced by inter-vehicle communication from other vehicles that have received and stored the broadcast data during and / or during the passage of the section. Thus, the broadcast can be reproduced without interruption. Broadcast data received by inter-vehicle communication is stored so as to be continuous with broadcast data received by the host vehicle.

  As described above, in the broadcast data reproducing apparatus of the present embodiment, reproduction is delayed by the maximum non-communication time T, so that broadcast data for the maximum non-communication time T is always stored immediately before passing through each radio wave non-communication section. Yes. For this reason, even if the own vehicle cannot receive and store broadcast data in real time when passing through the radio wave non-communication zone, the radio wave non-interval zone can reproduce only the maximum non-communication time T by reproducing the stored broadcast data. Broadcast data can be continuously played back in near real time due to the delay.

The storage time T ends (step 42; Y), and broadcast data for the storage time T (in the example of the reception schedule in FIG. 2D, the broadcast data 1 to 4 frames corresponding to the storage time T from the start of storage). When the reception of 4) is completed, the received data 1 to 4 are transferred to the reproducible area (step 44).
The transition to the reproducible area is such that the received broadcast data is made reproducible. In this embodiment, the broadcast data for the storage time T stored in the hard disk 16 sequentially in step 41 can be replayed. By attaching a reproducible flag indicating that However, the broadcast data stored on the hard disk 16 is stored in a reproduction-only RAM area, or is copied and stored in another reproduction-only area on the hard disk 16 to shift to a reproducible area (step 44). ).

Next, the central processing unit 11 makes an end determination (step 45). In the end determination, the end is determined when a designated or reserved broadcast is completed, a broadcast reception end instruction, or power is turned off. Further, when the vehicle arrives at the destination, it may be determined to end (step 45; Y).
If not completed (step 45; N), the central processing unit 11 returns to step 40, sets a new storage time T, and continues receiving and storing broadcast data.
In the reception schedule of FIG. 2D, reception of broadcast data 5 and subsequent is continued.

  While the reception of the broadcast data is continued, if the traveling position of the vehicle enters the radio wave non-interval section and the received radio wave intensity becomes insufficient (step 43; N), the central processing unit 11 has the radio wave intensity. The vehicle position information and the radio wave intensity information at the time when it becomes insufficient are acquired from the GPS receiver 13 and the radio wave intensity monitoring circuit 19, respectively, and stored in the RAM (step 46).

Then, the broadcast data received and stored in the hard disk 16 until the radio wave intensity becomes insufficient shifts to the reproducible area (step 47).
Thereafter, since the broadcast data from the own vehicle cannot be received until the own vehicle passes through the radio wave non-communication section and travels to a point where the radio wave intensity is sufficient, the central processing unit 11 performs a reception resumption process (step) 48).

In the reception schedule of FIG. 2D, after the reception of broadcast data is started, the broadcast data 1 to 4 for the storage time T is transferred to the reproducible area, the storage time T is set again, and the broadcast data 5 and later are set. Continue receiving.
When the broadcast data 5, 6 and 7 are received and the vehicle position enters the radio wave non-interval section A and the radio wave intensity becomes insufficient, the received broadcast data 5 to 7 are transferred to the reproducible area.
Broadcast data 8 to 11 for the frames broadcast during the radio wave non-communication section A (passing time TA) (in this case, the maximum passing time = the frame corresponding to the storage time T) are received by the own vehicle. Therefore, as described later, it is received from another vehicle by inter-vehicle communication.
While passing through the radio wave non-communication section A, the central processing unit 11 monitors whether or not the radio wave intensity has shifted to a sufficient point by the reception resumption process (step 48).

FIG. 5 is a flowchart showing the operation of the reception restart process.
The central processing unit 11 determines whether or not the radio field intensity received by the RF receiver 18 is sufficient by the radio field intensity monitoring circuit 19 (step 50). If not (step 50; N), Continue monitoring.
On the other hand, when the vehicle detects a sufficient radio field intensity by passing through the radio wave non-interval section, the central processing unit 11 receives the vehicle position information and the radio field intensity information at the time when the radio field intensity is sufficient. Is obtained from the machine 13 and the radio wave intensity monitoring circuit 19 and stored in the RAM (step 51), and the process returns to the flowchart of FIG.

  The vehicle position information and the radio wave intensity information at the time when the radio wave intensity stored in the RAM at step 51 becomes sufficient are the vehicle position at the time when the radio wave intensity stored in the RAM at step 46 (FIG. 4) becomes insufficient. The information and the radio wave intensity information are stored in a predetermined area of the hard disk 16 and used for updating the radio wave intensity map database 17.

After the reception resumption process in step 48 (FIG. 4), the central processing unit 11 makes an end determination again and does not end (step 45; N), returns to step 40 and sets a new storage time T again. Continue receiving and storing broadcast data.
In the example of the reception schedule in FIG. 2D, reception and storage under a new storage time T are started from the broadcast data 12 at the time of passing through the radio wave interruption section A.
As described above, reception, storage, and transition to a playable area are performed in units of broadcast data corresponding to the storage time T (broadcast data of 4 frames in the example of FIG. 2), and within the storage time T If the radio wave cannot be received after reaching the radio wave non-communication period A, the broadcast data received up to that time is set and stored, and the transition to the reproducible area is performed.

In the example of the reception schedule in FIG. 2, the process shifts to a reception, storage, and playback area for four frames of broadcast data 12 to 15 that are broadcast corresponding to the newly set storage time T.
Then, when the broadcast data 16 broadcast corresponding to the storage time T set again is received by the host vehicle, when the next radio wave non-communication section B is entered, reception restart processing is performed. When the radio wave intensity becomes sufficient after passing through the radio wave non-communication section B, the storage time T is set again, and the broadcast data 20 and subsequent broadcast data is received and stored in units of four frames, and the process such as shifting to the playable area is performed. continue.

Next, broadcast data playback processing will be described.
FIG. 6 is a flowchart showing the reproduction processing operation.
The central processing unit 11 determines whether there is reproducible data based on the presence / absence of broadcast data that has been transferred to the reproducible area (step 60). That is, in the present embodiment, it is determined whether there is unreproduced broadcast data with a reproducible flag among the broadcast data sequentially stored in the hard disk 16.

If there is reproducible broadcast data (step 60; Y), the central processing unit 11 sequentially reproduces the corresponding broadcast data (step 61).
In this way, by reproducing the broadcast data that has shifted to the reproducible area, the reproduction is started after receiving the broadcast data for the storage time T (maximum disconnection time T).
As a result, the broadcast data is always reproduced with the storage time T delayed from the time when the broadcast data was actually broadcast, so that the broadcast can be reproduced almost in real time without interruption.

The broadcast data reproduction is started when the stored broadcast data is first transferred to the reproducible area, but the broadcast reception may be received after the storage time T has elapsed from the start time.
Further, it may be after both conditions of transition of the broadcast data to the first reproducible area and elapse of the storage time T are satisfied.

  In the case of the reproduction schedule example in FIG. 2E, all broadcast data 1, 2, 3,... To be reproduced are reproduced with a storage time T (four frames in the example of FIG. 2) delayed from the actual broadcast. The That is, while the broadcast data 1 to 4 (4 frames of broadcast data corresponding to the storage time T) are being broadcast, only reception and storage are performed, and the next broadcast data 5, 6, 7,. , Broadcast data 1, 2, 3,... Delayed by storage time T (4 frames) is reproduced.

Broadcast data for the storage time T (for 4 frames) is always stocked, and the broadcast data for this stock is reproduced while traveling in each radio wave non-communication section A, B,.
In the example of FIG. 2, the unplayed broadcast data 4 to 7 are stocked immediately before traveling in the radio wave non-communication section A (immediately after the reproduction of the broadcast data 3 is finished), and immediately before traveling in the radio wave non-communication section B. Unreproduced broadcast data 13 to 16 are stocked. Then, the stocked broadcast data 4-7 (4 frames corresponding to the relevant section) are reproduced while traveling in the radio wave non-communication section A, and the stocked broadcast data 13-15 (corresponding to the relevant section) while traveling in the non-radioactive section B. 3 frames to be played).

  In FIG. 6, when the central processing unit 11 reproduces the broadcast data (step 61), the central processing unit 11 makes an end determination in the same manner as in step 45 (FIG. 4) and does not end (step 62; N). Continue to play broadcast data.

In step 60, when there is no reproduction data, that is, when there is no unreproduced broadcast data to which a reproducible flag is added (step 60; N), the central processing unit 11 stores the broadcast data. A vehicle is searched (step 63).
That is, when the reproduction data no longer exists, the own vehicle passes through each radio wave non-communication section, and therefore the range of broadcast data that cannot be received by the RF receiver 18 is known by traveling in the section. Search for other vehicles that store the broadcast data of the range.
Then, the central processing unit 11 receives (acquires) broadcast data from another vehicle that holds the searched broadcast data via the transceiver 22 by inter-vehicle communication, and stores it in the hard disk 16 with a reproducible flag. (Step 64).

In the reproduction schedule of FIG. 2 (e), there is no reproduction data at the time point P1 at which the broadcast data 7 is reproduced and the time point P2 at which the broadcast data 16 is reproduced. Therefore, the central processing unit 11 can recognize that the broadcast data 8 to 11 and the broadcast data 17 to 19 broadcast during that time cannot be received and are insufficient.
Therefore, the central processing unit 11 searches the other vehicle A storing the broadcast data 8 to 11 that could not be received at the time P1, and the other vehicle B storing the broadcast data 17 to 19 at the time P2. To do.

Searching for other vehicles holding broadcast data and receiving broadcast data are performed as follows.
That is, the central processing unit 11 specifies the IP address (identification information) of its own device via the transmitter / receiver 22 and broadcasts a network connection request by inter-vehicle communication to other surrounding vehicles, thereby connecting the network. A network is formed with other vehicles that have received permission. The connection permission from the other vehicle is the connection permission by receiving the IP address of the other vehicle.

  The central processing unit 11 designates the IP address of another vehicle that is permitted to connect, and requests the other vehicle to transmit broadcast data. The broadcast data transmission request is transmitted by attaching the IP address of the own apparatus to necessary broadcast information for designating broadcast data desired to be transmitted (specification and range of the broadcast).

Note that the other vehicle (referred to as r1) that has received the broadcast data transmission request from the host vehicle may not have the requested broadcast data. In this case, in the present embodiment, the other vehicle r1 is in the position of the host vehicle described above, and similarly, performs network connection, broadcast data transmission request, broadcast data reception, and the like with the other vehicle r2.
Upon receiving broadcast data from the other vehicle r2, the other vehicle r1 transmits broadcast data transmission permission to the host vehicle, and then transmits the broadcast data received from the other vehicle r2 to the host vehicle, thereby requesting the requested broadcast. Data can be reliably transmitted to the host vehicle.
If the other vehicle r2 does not have the requested broadcast data, the search is continued until it is received from the other vehicle r3 in the same manner and the requested broadcast data is transmitted to the own vehicle.

In FIG. 6, when broadcast data is received from another vehicle by inter-vehicle communication and stored in the hard disk 16 (step 64), the central processing unit 11 proceeds to step 61 and sequentially reproduces the broadcast data received from the other vehicle. (Step 61).
While the broadcast data received from another vehicle by inter-vehicle communication is being reproduced, since this time is after passing through the radio wave non-communication section, the central processing unit 11 performs broadcast data at the RF receiver 18 by the broadcast reception operation (FIG. 4). Continue to receive and save
After the reproduction of the broadcast data received by the inter-vehicle communication is completed, the central processing unit 11 reproduces the broadcast data received and stored by the RF receiver 18 again.

In the example of the reproduction schedule of FIG. 2E, when the broadcast data 7 is reproduced, there is no reproduction data (broadcast data with a reproducible flag attached) (step 60; N), and this time (however, it ends). Another vehicle having unreceived broadcast data 8 to 11 broadcast while passing through the radio wave non-communication section A by inter-vehicle communication is searched.
In the example of FIG. 2, since the other vehicle A has the broadcast data 8 to 11, the broadcast data 8 to 11 is received from the other vehicle A and stored in the hard disk 16, and the broadcast data 7 continues to the broadcast data. Play 8-11.

While the broadcast data for four frames (save time T) of the broadcast data 8 to 11 is being reproduced, the central processing unit 11 is broadcast during this time as shown in the reception schedule of FIG. Broadcast data 12 to 15 are received by the RF receiver 18 and stored in the hard disk 16.
Then, after the reproduction of the broadcast data 8 to 11 received from the other vehicle A is completed, the central processing unit 11 continuously reproduces the broadcast data 12 to 15 received by the RF receiver 18.

Similarly, when the broadcast data 16 is reproduced, there is no reproduction data, and the central processing unit 11 holds unreceived broadcast data 17 to 19 broadcast while passing through the radio wave non-communication section B by inter-vehicle communication. Search vehicle B.
The central processing unit 11 receives the broadcast data 17 to 19 from the other vehicle B, stores it in the hard disk 16, reproduces the broadcast data 17 to 19 following the broadcast data 16, and broadcasts broadcast during that time. Receive and store data 21-23.

As described above, according to the broadcast data reproducing apparatus of the present embodiment, the following effects can be obtained.
(1) Even if broadcast data can be received only intermittently due to passage through a radio wave interruption section, all the broadcast data is continuously received by receiving the broadcast data of the interrupted part from other vehicles through inter-vehicle communication. And can be stored in the hard disk 16.
(2) Also, playback is delayed by the storage time T (maximum non-communication time T) from the start, not at the same time as the start of the broadcast, so that it is interrupted in the near real time state without a substantial time delay. Broadcast data can be reproduced continuously.
(3) Since the passage time of each radio wave interruption section is calculated using the traffic jam information, a more accurate passage time can be calculated.

Although one embodiment of the broadcast data reproducing apparatus of the present invention has been described above, the present invention is not limited to the described embodiment, and various modifications can be made within the scope described in each claim. is there.
For example, in the described embodiment, the maximum non-communication time T is determined from the passage time of each radio wave non-existing section existing on the travel route to the destination searched by the route search, but the vehicle is not limited to the travel route searched. It is also possible to acquire road data existing within a predetermined distance Nkm (for example, 50 km, 30 km, etc.) from the current location and determine the maximum non-communication time T from the passage time of each radio wave non-existence section existing on the road data. Good.
In addition, when a travel route to the destination is searched, a radio wave non-interval section on the travel route is targeted, and when a travel route is not searched, a radio wave non-existence section existing within a predetermined distance Nkm. The maximum non-communication time T may be determined for.
In the case of this modification, the central processing unit 11 functions as a travel route acquisition unit by acquiring road data existing within a predetermined distance Nkm from the current vehicle position.

  In the embodiment described above, the maximum interruption time T is set as the storage time T. However, the maximum interruption time T + α = the storage time T2 may be adopted. In this way, by setting the storage time T2 stored longer by the allowance time α as the time lag time of the reproduction schedule, it is possible to sufficiently secure time for searching for another vehicle that can receive broadcast data while passing through the radio wave non-communication section. Thus, the broadcast data can be continuously reproduced more reliably.

Further, in the embodiment described above, when the other vehicle r1 connected to the network requests the necessary broadcast data and the other vehicle r1 does not have the broadcast data, the other vehicle r1 further secures the broadcast data from the other vehicle r2. In the above description, the transmission request is transmitted to the other vehicle rx that holds the requested broadcast data, and the broadcast data is secured by expanding the network in a chain manner.
On the other hand, the other vehicle r1 that does not have the requested broadcast data refuses transmission of the broadcast data, and the own vehicle that has been refused transmission makes a transmission request for broadcast data to another other vehicle r2. By doing so, the transmission request may be issued in a radial pattern around the host vehicle.

Note that the other vehicle (referred to as r1) that has received the broadcast data transmission request from the host vehicle may not have the requested broadcast data. In this case, in the present embodiment, the other vehicle r1 is in the position of the host vehicle described above, and similarly, performs network connection, broadcast data transmission request, broadcast data reception, and the like with the other vehicle r2.
Upon receiving broadcast data from the other vehicle r2, the other vehicle r1 transmits broadcast data transmission permission to the host vehicle, and then transmits the broadcast data received from the other vehicle r2 to the host vehicle, thereby requesting the requested broadcast. Data can be reliably transmitted to the host vehicle.
If the other vehicle r2 does not have the requested broadcast data, the search is continued until it is received from the other vehicle r3 in the same manner and the requested broadcast data is transmitted to the own vehicle.

1 illustrates a configuration of a broadcast data reproduction device according to an embodiment of the present invention. It is explanatory drawing which represented notionally the schedule of reception and reproduction | regeneration of broadcast data in the own vehicle carrying a broadcast data reproduction | regeneration apparatus. It is a flowchart showing a broadcast preservation time calculation process. It is a flowchart showing broadcast data reception operation. It is a flowchart showing the operation | movement of a reception resumption process. It is a flowchart showing the reproduction processing operation.

Explanation of symbols

11 Central processing unit 12 Bus line 13 GPS receiver 14 Input device 15 Audio output device 16 Hard disk 17 Radio wave intensity map database 18 RF receiver 19 Radio wave intensity monitoring circuit 20 Monitor 21 Receiver 22 Transceiver

Claims (2)

First broadcast data receiving means for receiving broadcast data;
Vehicle-to-vehicle communication means for transmitting and receiving data to and from other vehicles;
Second broadcast data receiving means for receiving broadcast data that could not be received due to passage of a radio wave non-communication section from another vehicle by inter-vehicle communication by the inter-vehicle communication means;
Broadcast data storage means for storing broadcast data received by the first broadcast data receiving means and broadcast data received by the second broadcast data receiving means;
Playback means for continuously playing back broadcast data stored in the broadcast data storage means;
Traveling route acquisition means for acquiring a traveling route;
A non-interruptible section acquisition means for acquiring a radio non-communication section that is present on the travel route and cannot receive the broadcast data;
Calculating a passing time of each acquired radio wave non-interval section, and determining a maximum non-interactive time, and a maximum non-interactive time determining means,
The reproduction means starts reproduction of the stored broadcast data after the broadcast data for at least the maximum interruption time is received by the first broadcast data reception means.
A broadcast data reproducing apparatus characterized by the above. A traffic information acquisition means for acquiring traffic information is provided.
The maximum outage time determining means calculates a transit time based on the distance of each radio wave outage section and traffic information in the section.
The broadcast data reproducing apparatus according to claim 1 .

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