JP4801990B2 - Electronic device and data transfer method executed in the electronic device - Google Patents

Description

The present invention relates to an electronic device equipped with a wireless function, for example, and a data transfer method executed in the electronic device.

In recent years, with the progress of digitization, data can be copied relatively easily. Therefore, a technology considering the copyright of digital data has been developed.

For example, in order to transfer a high-quality moving image or the like typified by terrestrial digital broadcasting from one device to another, data transfer is performed in accordance with a rule called “move” due to copyright protection regulations.

The move is a function for preventing the copy of the original digital data from being present for the purpose of suppressing an increase in the digital data not considering the copyright of the original digital data. For example, when transferring content by executing a function called “move” from the device A having digital data to the device B, the device A transfers the digital data to the device B, the device B copies the digital data, The device A completely erases the transferred content or makes it inaccessible. A technique relating to the move function is disclosed in Patent Document 1 (see Patent Document 1).
JP 2001-84177 A

By the way, when the transfer of the digital data by the move fails, the transmission side device cannot use the digital data to be transferred, and therefore cannot retransmit the digital data to the communication partner.

Therefore, an object of the present invention is to provide an electronic device that can reliably transfer data to a communication partner and a data transfer method that is executed by the electronic device.

In order to achieve the above object, an electronic device according to claim 1 includes a first wireless communication unit that performs wireless communication with an external device, and the external wireless communication method different from the first wireless communication unit. Second wireless communication means for performing wireless communication with the device, and using data already received by the external device based on information about data already received by the external device acquired by the second wireless communication means and control means for controlling so that the disabled state, wherein, when the external device can not receive the data sent by the first radio communication means, wherein the external device is already received The second wireless communication means is controlled to acquire information on the data being processed from the external device, and the external device acquired by the second wireless communication means has already received the information. By referring to the information related to the data, the external device is controlled to transmit the data not received, and based on the information related to the data already received by the external device acquired by the second wireless communication unit, Control is performed so that data already received by the external device is disabled .

Further, the data transfer method executed in the electronic device according to claim 5 is a data transfer method executed in the electronic device capable of wireless communication with the external device by the first wireless communication means and the second wireless communication means. In this case, when the external device cannot receive the data transmitted by the first wireless communication means, the second wireless communication means sends information related to the data already received by the external device to the external device. The external device acquired by the second wireless communication means is referred to the information on the data already received, and is controlled to transmit the data not received by the external device, Data already received by the external device based on information about data already received by the external device acquired by the second wireless communication means And controlling such that the disabled state.

ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the electronic device which can transfer data reliably to a communicating party, and the data transfer method performed with this electronic device.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram illustrating communication executed between a first electronic device and a second electronic device each including a first wireless communication unit and a second wireless communication unit.

A wireless device A that is a first electronic device performs wireless communication with a wireless device B that is a second electronic device. Wireless device A can execute wireless communication using wireless device B and two wireless communication means.

The wireless device A communicates with the wireless device B, for example, as a first wireless communication means UWB (Ultra Wide).
Band) and the second wireless communication means Bluetooth (registered trademark, the same applies hereinafter) to perform wireless communication.

The wireless device A transmits digital data to the wireless device B by wireless communication means. In this embodiment, consider an example in which video data is transmitted from the wireless device A to the wireless device B.

When transmitting video data from the wireless device A to the wireless device B, the wireless device A executes a move function. For example, when the wireless device A transfers video data to the wireless device B, the wireless device A cannot be completely erased or accessed to prevent the content transferred to the wireless device B from being played back. It is a function to make a state.

While the wireless device A is transferring video data to the wireless device B using UWB, the video data may not be transferred between the wireless device A and the wireless device B for some reason using UWB. sell. For example, this is a case where a failure occurs in the wireless path of UWB communication established between the wireless device A and the wireless device B. As a cause of the failure, the wireless device A and the wireless device B due to the movement of the wireless device may be out of a communicable range or frequency interference.

When video data cannot be transferred between the wireless device A and the wireless device B using UWB, the wireless device A executes the move function and transmits the video data to the wireless device B.
The digital content that the wireless device A has already determined to have transmitted to the wireless device B is completely erased or made inaccessible.

When video data transmitted from the wireless device A to the wireless device B is not received by the wireless device B due to a wireless communication failure between the wireless device A and the wireless device B, video data to be received by the wireless device B The wireless device A has the wireless device A because the transmitted video data is completely erased or made inaccessible by the wireless device A executing the move function even though the wireless device A is not received. The video data is not completely transmitted to the wireless device B.

Therefore, a configuration that enables video data held by the wireless device A to be transferred to the wireless device B will be described below. Next, system configurations of the first wireless device and the second wireless device will be described.

FIG. 2 is a diagram illustrating an example of a system configuration of the first electronic device and the second electronic device.

The wireless device A in FIG. 1 corresponds to the first electronic device 1, and the wireless device B corresponds to the second electronic device.

The first electronic device 1 includes a control unit 100, a storage unit 101, a first wireless communication unit 102, a second wireless communication unit 103, an antenna 104, and an antenna 105.

The control unit 100 includes a storage unit 101, a first wireless communication unit 101, and a second wireless communication unit 10.
3 is connected.

The control unit 100 controls the entire system of the first electronic device 1. For example, video data storage processing in the storage unit 101, read processing of video data stored in the storage unit 101, execution processing of a program developed in the storage unit 101, first video data read from the storage unit 101 Transfer processing to the wireless communication unit is executed.

The storage unit 101 stores video data transmitted to the second electronic device 2. For example, a move program 101a for realizing the move function is developed. Further, a serial number (SN) assigning program 101b for assigning a serial number to the video data to be transmitted for each order of transmission to the second electronic device 2 is also developed.

The first wireless communication unit 102 performs wireless communication with the second electronic device 2 via the antenna 104. The first wireless communication unit 102 transmits the video data stored in the storage unit 101 to the antenna 1.
The data is transmitted to the second electronic device 2 via 04. For example, UWB as the first wireless communication unit 102
A wireless communication unit can be considered.

The second wireless communication unit 103 performs wireless communication with the second electronic device via the antenna 105. As the second wireless communication unit 103, for example, a Bluetooth wireless communication unit can be considered.

On the other hand, the second electronic device 2 includes a control unit 200, a storage unit 201, a first wireless communication unit 202,
A second wireless communication unit 203, an antenna 204, and an antenna 205 are included.

The control unit 200 includes a storage unit 201, a first wireless communication unit 201, and a second wireless communication unit 20.
3 is connected.

The control unit 200 controls the entire system of the second electronic device 2. For example, a video data storage process in the storage unit 201, a read process of the video data stored in the storage unit 201, an execution process of a program developed in the storage unit 201, and the like are executed.

  The storage unit 201 stores video data transmitted from the first electronic device 1.

The first wireless communication unit 202 performs wireless communication with the first electronic device 1 via the antenna 204. The first wireless communication unit 202 receives video data transmitted from the first electronic device 1 via the antenna 204. As the first wireless communication unit 202, for example, a UWB wireless communication unit can be considered.

The second wireless communication unit 203 performs wireless communication with the first electronic device 2 via the antenna 205. As the second wireless communication unit 203, for example, a Bluetooth wireless communication unit can be considered.

As the first wireless communication units 102 and 202, a wireless communication system having a wide frequency band that can support video data transfer with a large amount of data is suitable.

As the second wireless communication units 103 and 203, a wireless communication method having a wider wireless communication range than the wireless communication method executed by the first wireless communication units 102 and 202 is suitable. Further, as the second wireless communication units 103 and 203, in order to avoid radio wave interference with the wireless communication system executed by the first wireless communication units 102 and 202, the first wireless communication units 102 and 202 A wireless communication system that uses a frequency band different from the frequency band used by the executed wireless communication system is suitable. Next, a data transmission procedure executed between the first electronic device 1 and the second electronic device 2 will be described.

FIG. 3 is a flowchart illustrating an example of a data transmission procedure executed between the first electronic device 1 and the second electronic device 2.

First wireless communication unit 102 of first electronic device 1 and first wireless communication unit 2 of second electronic device 2
02 establishes a wireless communication path conforming to the UWB wireless communication system. Video data is transmitted from the first electronic device 1 to the second electronic device 2 via a wireless communication path conforming to the UWB wireless communication system (step S101). At this time, the move function is executed in the first electronic device 1.

When video data is not transferred from the first electronic device 1 to the second electronic device 2 via a wireless communication path conforming to the UWB wireless communication method (step S102), the first electronic device 1
The second wireless communication unit 103 of the second electronic device 2 and the second wireless communication unit 203 of the second electronic device 2 are blue.
A wireless communication path conforming to the oth wireless communication system is established.

Here, in the case of step S102, as described above, the first electronic device 1 and the second electronic device 2 due to movement of the wireless device are outside the UWB communication possible range or UWB wireless communication due to frequency interference or the like. It is conceivable to disconnect the wireless communication path according to the method.

In a state where a wireless communication path conforming to the Bluetooth wireless communication method is established between the first electronic device 1 and the second electronic device 2, the first electronic device 1
h The second electronic device 2 is inquired of the second electronic device 2 for information related to video data already received via the wireless communication path according to the wireless communication method (step S103). As information about video data that has already been received, for example, a serial number assigned to the video data can be considered.

When the first electronic device 1 receives the serial number information transmitted from the second electronic device 2 (Yes in step S104), the received serial number information is stored in, for example, the storage unit 101 (step S105).

The first electronic device 1 refers to the serial number information transmitted from the second electronic device 2 and the first electronic device 1 to the second of the video data that the first electronic device 1 has. The video data transmitted to the electronic device 2 and stored in the storage unit 201 of the second electronic device 2 is completely erased or made inaccessible (step S106). This prevents the same video data from existing in the first electronic device 1 and the second electronic device 2.

When the first electronic device 1 establishes a wireless communication path in accordance with the UWB wireless communication method again with the second electronic device 2 (Yes in step S107), the first electronic device 1 performs step S105.
For example, using the serial number information stored in the storage unit 101, video data to be transmitted to the second electronic device 2 is set through a wireless communication path in accordance with the UWB wireless communication system (step S108). .

As an example of a method for setting video data to be transmitted to the second electronic device 2 in step S105, the first electronic device 1 is attached to video data that has already been received by the second electronic device 2. Video data to be transmitted to the second electronic device 2 is set using the serial number information given to the video data last received by the second electronic device 2 in the serial number information.

The first electronic device 1 transmits the video data set in step S108 to the second electronic device 2 via a wireless communication path conforming to the UWB wireless communication method (step S101).

On the other hand, when the first electronic device 1 does not establish a wireless communication path according to the UWB wireless communication method again with the second electronic device 2 (No in step S107), the first electronic device 1 again uses the UWB wireless communication. It is determined whether or not to wait until wireless communication with the second electronic device 2 can be executed via the wireless communication path conforming to the communication method (step S109). When waiting for the first electronic device 1 to be able to execute wireless communication with the second electronic device 2 again via the wireless communication path conforming to the UWB wireless communication method (Yes in step S109), the process of step S107 is performed. Return. The second electronic device 2 that has received the video data deletes the serial number data from the video data with the serial number and creates original video data.

When a failure occurs in video data transfer from the first electronic device 1 to the second electronic device 2 using a wireless communication path according to the UWB wireless communication system, the communication range of the UWB communication is more than B.
Since the communicable range of the Bluetooth communication is wider, the first electronic device 1 gives to the second electronic device 2 video data used when retransmitting the video data via a wireless communication path in accordance with the Bluetooth wireless communication system. It is possible to receive the serial number information.

In the example described above, there is a possibility that incomplete video data transfer from the first electronic device 1 to the second electronic device 2 occurs when a failure occurs in the wireless communication path in accordance with the Bluetooth wireless communication method. is there. Therefore, when it is desired to completely transfer video data from the first electronic device 1 to the second electronic device 2, it is determined that a wireless communication path conforming to the Bluetooth wireless communication system is always secured. The video data may be transferred from the first electronic device 1 to the second electronic device 2. Next, the serial number assigned to the video data will be described.

The video data of the first electronic device 1 is transmitted from the first electronic device 1 to the second electronic device 2.
Is transferred to video data of a certain size in the first electronic device 1.

FIG. 4 shows an example of a general video format. Video data conforming to this video format is an aggregate of PG (Program) called PGC (Program Chain). The method of determining the amount of video data created by the division process is as follows: PTT (Part of Title <Chapter>) that can be selected by the user on the interface, Cell that configures the PG,
Video Object Unit) can be determined according to accuracy and load.

Below, the transferred video data is classified as NV_PCK (Navigation Pack), Video Data, Audio Data.
An example of division in units of VOBU composed of The data amount of VOBU is the amount of data reproduced in a very short time such as 0.4 to 1 (sec).

FIG. 5 shows an example of serial number setting. For example, a serial number used for video data transfer processing is set at the beginning of VOBU. The serial number is very small in data amount.

For example, it is set at the head of the VOBU for retransmission processing from the first electronic device 1 to the second electronic device 2 after interruption of the video data transfer from the first electronic device 1 to the second electronic device 2 When the serial number is used, the first electronic device 1 and the second electronic device 2 have the same duplication of data having the same video data, and the second electronic device 1 has the second data despite the fact that the first electronic device 1 has. It is possible to avoid the problem of data loss that is not transferred to the electronic device 2.

The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

The figure shown about the communication performed between the 1st electronic device and 2nd electronic device which comprise a 1st radio | wireless communication means and a 2nd radio | wireless communication means. FIG. 10 illustrates an example of a system configuration of a first electronic device and a second electronic device. 5 is a flowchart showing an example of a data transmission procedure executed between the first electronic device 1 and the second electronic device 2. The figure which shows a general video format. The figure shown about serial number setting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... 1st electronic device, 2 ... 2nd electronic device, 100 ... control part,
101 ... Storage unit, 102 ... First wireless communication unit, 103 ... Second wireless communication unit,
200 ... control unit, 201 ... storage unit, 202 ... first wireless communication unit,
203 ... the second wireless communication unit,

Claims (8)

First wireless communication means for performing wireless communication with an external device;
Second wireless communication means for performing wireless communication with the external device by a wireless communication method different from the first wireless communication means;
Based on the information about the data that the external device obtained by the second wireless communication unit has already received, and control means for controlling so that data the external device has already received a disabled state,
When the external device fails to receive the data transmitted by the first wireless communication unit, the control unit sends information related to data already received by the external device by the second wireless communication unit. Control to acquire from the external device, and control to transmit data not received by the external device by referring to information on data already received by the external device acquired by the second wireless communication means And controlling the data already received by the external device to be in an unusable state based on information about the data already received by the external device acquired by the second wireless communication means. machine. 2. The electronic device according to claim 1, wherein the data transmitted by the first wireless communication unit is provided with number information indicating an order of transmission to the external device. The electronic device according to claim 2, wherein the second wireless communication unit obtains number information given to data already received by the external device from the external device.   The electronic device according to claim 1, wherein the unusable state is one of an erased state and an inaccessible state. In a data transfer method executed in an electronic device capable of wireless communication with an external device by a first wireless communication unit and a second wireless communication unit,
When the external device fails to receive the data transmitted by the first wireless communication unit, the second wireless communication unit obtains information about the data already received by the external device from the external device. Control to transmit data not received by the external device by referring to information on the data already received by the external device acquired by the second wireless communication means, A data transfer method comprising: controlling the data already received by the external device to be in an unusable state based on information about the data already received by the external device acquired by the wireless communication means . 6. The data transfer method according to claim 5 , wherein number data indicating an order of transmission to the external device is given to data transmitted by the first wireless communication unit. The data transfer method according to claim 6, wherein the second wireless communication unit obtains number information given to data already received by the external device from the external device.   6. The data transfer method according to claim 5, wherein the unusable state is one of an erased state and an inaccessible state.

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