WO2015019736A1

WO2015019736A1 - Transmission device

Info

Publication number: WO2015019736A1
Application number: PCT/JP2014/066874
Authority: WO
Inventors: 琢也岩波; 伊藤　典男; 渡部　秀一; 久雄熊井
Original assignee: シャープ株式会社
Priority date: 2013-08-07
Filing date: 2014-06-25
Publication date: 2015-02-12
Also published as: JPWO2015019736A1

Abstract

The present invention is provided with: a first content-transmission unit (34) which transmits content to reception devices (5) via a broadcast network; a second content-transmission unit (46) which transmits content to the reception devices (5) via a communication network; and an access control determination unit (45) which determines whether the reception devices (5) are capable of receiving hybrid transmission. The second content-transmission unit (46) transmits content to the reception devices (5) which have been determined as being capable of receiving hybrid transmission by the access control determination unit (45).

Description

Transmitter

The present invention relates to a transmission device that transmits content.

In recent years, hybrid transmission (Hybrid Delivery) technology that distributes content data using a plurality of routes, particularly heterogeneous networks, such as broadcasting and communication, unicast communication and multicast communication has been used. A receiving device that receives content transmitted by the hybrid transmission technology reproduces content by synchronizing or synthesizing data received through different paths.

Examples of hybrid transmission technology include the following.
-Transmit video content by broadcasting and transmit additional information related to the video content (information indicating program explanation or recommended program) by communication.
-Regarding 3D video content, the left-eye (main) video is transmitted by broadcasting, and the right-eye (sub) video is transmitted by communication.
As an efficient hybrid transmission technique, base layer data is transmitted by broadcast and enhanced layer data is transmitted by communication for scalable encoded video content. -Video content is transmitted by broadcasting, and a plurality of related videos and additional information related to the video content such as videos taken from other angles are transmitted by communication, and the video content, related video and additional information are transmitted on one screen. Etc. are displayed in multiple windows.

Japanese Patent Publication “Japanese Patent Laid-Open No. 2005-286748 (published on October 13, 2005)” Japanese Patent Publication “Japanese Patent Laid-Open No. 10-173612 (published on June 26, 1998)”

Conventionally, in preparation for cases where it is difficult to receive normal broadcasting due to rain, etc., in addition to normal broadcasting, rainfall-compatible broadcasting has been performed in which data with reduced video / audio quality is broadcast in parallel in a manner that is resistant to rain. Yes. In this case, the receiving apparatus switches and reproduces normal broadcast data or rainfall-compatible broadcast data according to the reception state. However, in situations such as heavy rain, the receiving device may not be able to receive data for rainfall-compatible broadcasts.

Here, in order to solve this problem, it is considered to transmit data corresponding to rainfall using hybrid transmission technology. Specifically, the transmission device transmits data of rain corresponding broadcast to be transmitted during rain via communication. The receiving device switches and reproduces normal broadcast data or rainfall-compatible broadcast data received via communication according to the reception state.

In this case, the rain support service provider assumes that only the receiving device in the rain area acquires the data of the rain support broadcast via communication, but the reception device outside the rain area also receives the rain support broadcast via communication. It is possible to acquire the data. For this reason, if there is an access to a rainfall-compatible broadcasting server from a receiving device outside the rainfall area, the load on the server may exceed the assumption and an appropriate service may not be provided to the receiving device in the rainfall area.

The present invention has been made in view of the above-described problems, and an object of the present invention is to realize a transmission apparatus that appropriately transmits contents by hybrid transmission to a reception apparatus to be hybrid-transmitted.

In order to solve the above problem, a transmission device according to one aspect of the present invention is a transmission device that transmits content to a reception device, and transmits data constituting the content to the reception device via a first network. First transmitting means for transmitting, second transmitting means for transmitting data constituting the content to the receiving device via a second network different from the first network, the first transmitting means and the second transmitting means Determining means for determining whether the receiving apparatus is a hybrid transmission target receiving apparatus that transmits data from the second transmission means, wherein the second transmitting means sends data to the receiving apparatus determined to be the hybrid transmission target. Send.

According to one aspect of the present invention, there is an effect that it is possible to appropriately perform hybrid transmission to a receiving apparatus to be hybrid-transmitted.

It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 1 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. 6 is a sequence diagram illustrating an example of a processing flow of a transmission device and a reception device according to Embodiment 1. FIG. It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 2 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. 10 is a sequence diagram illustrating an example of a processing flow of a transmission device and a reception device according to Embodiment 2. FIG. It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 3 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. 10 is a sequence diagram illustrating an example of a processing flow of a transmission device and a reception device according to Embodiment 3. FIG. It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 4 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. FIG. 10 is a sequence diagram illustrating an example of a processing flow of a transmission device and a reception device according to a fourth embodiment. It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 5 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. FIG. 10 is a sequence diagram illustrating an example of a processing flow of a transmission device and a reception device according to a fifth embodiment. It is a block diagram which shows an example of a structure of the transmission system which concerns on Embodiment 6 of this invention, and the transmission apparatus and reception apparatus which are included in the said transmission system. It is a figure which shows an example of the screen display area and designated area which concern on Embodiment 6. FIG. It is a figure which shows another example of the screen display area and designated area which concern on Embodiment 6. FIG. FIG. 10 is a diagram illustrating an example of a processing flow of an output unit of a receiving device according to a sixth embodiment. It is a figure which shows an example of the video parameter of the video content which concerns on Embodiment 6, the list | wrist of a video content, and a superimposition position table. It is a figure which shows an example of the screen on which the video content which concerns on Embodiment 6 was superimposed. It is a figure which shows an example of the screen display area | region which concerns on Embodiment 6, a designation | designated area | region, and a margin part.

<Embodiment 1>
Embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2. In the present embodiment, the transmission device transmits content by communication in addition to content transmission by broadcast (normal broadcast) during a period when it is raining in the broadcast area. Here, the content transmitted by the transmission device is composed of a plurality of components such as video, audio, and text, and the transmission device transmits in component units (or units obtained by further dividing the components). Further, it is assumed that the transmission device is a facility owned by a broadcaster, and the reception device is a television (television receiver), a mobile phone, a smartphone, a PC, or the like possessed by a viewer. However, the present invention is not limited to this, and the transmission device and the reception device may be arbitrary as long as they transmit or receive content.

Note that the transmission device transmits a component having the same quality as that of a component that is transmitted by normal broadcasting through communication. In the present embodiment, the transmission device performs multicast distribution to the reception device, but may be unicast distribution.

In addition, it is assumed that the transmission device uses IP multicast technology for providing content on an IP (Internet Protocol) network. In the IP multicast technology, IGMP (Internet Group Management Protocol) is used as a protocol for the receiving apparatus to control the video stream. In the present embodiment, the transmitting device notifies the multicast address to the receiving device that has permitted access to the transmitting device (multicast server). When starting the reception of the video stream, the receiving device transmits a Join message (IGMP JOIN) to the transmitting device and participates in the multicast address. When the reception apparatus ends the reception of the video stream, the reception apparatus leaves the multicast address by transmitting a Leave message (IGMP Leave) to the transmission apparatus, and ends.

[Configuration of transmitter and receiver]
First, the configuration of the transmission system according to the first embodiment and the transmission device and the reception device included in the transmission system will be described with reference to FIG. FIG. 1 is a block diagram illustrating an example of a configuration of a transmission system 1 according to the first embodiment and a transmission device 2 and a reception device 5 included in the transmission system 1.

As shown in FIG. 1, the transmission system 1 according to the first embodiment includes a transmission device 2 and a reception device 5. In the example illustrated in FIG. 1, the transmission system 1 includes one transmission device 2 and one reception device 5, but is not limited thereto. The transmission system 1 may include a plurality of transmission devices 2. The transmission system 1 may include a plurality of receiving devices 5.

The transmission device 2 transmits content to the reception device 5 via a plurality of different networks. Specifically, in the present embodiment, the transmission device 2 transmits content to the reception device 5 via a broadcast network (first network) or a communication network (second network). However, the transmission device 2 is not limited to this combination, and may transmit via a mobile phone network or a communication network, or may transmit via a wireless communication network or a wired communication network, for example. Moreover, the transmission apparatus 2 may transmit via 3 or more types of networks which are mutually different. In other words, the transmission device 2 is a first network in which transmission / reception of content is difficult (or impossible) under a certain situation, or a second network different from the first network, and the first network under the above situation. The content is transmitted to the receiving device 5 via the second network capable of transmitting and receiving the content more stably.

Further, as shown in FIG. 1, the transmission device 2 includes a first transmission device 3 that transmits via a broadcast network and a second transmission device 4 that transmits via a communication network. In the example illustrated in FIG. 1, the first transmission device 3 and the second transmission device 4 are separate bodies, but they may be integrated.

(First transmitter)
The first transmission device 3 includes a first transmission device control unit 31, a first transmission device storage unit 32, and a first transmission device transmission unit 33. In addition, although the 1st transmission apparatus 3 may be provided with members, such as a display part and an operation part, since it is not related to the feature point of invention, the said member is not illustrated.

The first transmission device transmission unit 33 transmits data to other devices such as the reception device 5 by broadcast waves in accordance with instructions from the first transmission device control unit 31. For example, the first transmission device transmission unit 33 is a transmission antenna.

The first transmission device control unit 31 performs various calculations by executing a program read from the first transmission device storage unit 32 to a temporary storage unit (not shown), and the first transmission device 3 includes the first transmission device control unit 31. It controls each part centrally.

In the present embodiment, the first transmission device control unit 31 is configured to include a first content transmission unit (first transmission unit) 34 as a functional block. The functional block (34) of the first transmission device control unit 31 includes a program stored in a storage device realized by a CPU (central memory processing unit) such as a ROM (read memory only) RAM (random memory access memory). This can be realized by reading out and executing the temporary storage unit realized by the above.

The first content transmission unit 34 acquires content from the content server 7 and transmits each component constituting the acquired content to the reception device 5 located in the broadcast area via the first transmission device transmission unit 33. .

The first transmission device storage unit 32 stores programs, data, and the like referred to by the first transmission device control unit 31.

(Second transmitter)
The second transmission device 4 includes a second transmission device control unit 41, a second transmission device storage unit 42, and a second transmission device communication unit 43. In addition, although the 2nd transmission apparatus 4 may be provided with members, such as a display part and an operation part, since it is not related to the feature point of invention, the said member is not illustrated.

The second transmission device communication unit 43 communicates with other devices such as the reception device 5 by wireless communication means or wired communication means (communication network 8), and exchanges data in accordance with instructions from the second transmission device control unit 41. Is to do.

The second transmission device control unit 41 performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and is included in the second transmission device 4. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41 includes a rainfall information acquisition unit 44, an access control determination unit (determination unit) 45, and a second content transmission unit (second transmission unit) 46 as functional blocks. is there. In each of the functional blocks (44 to 46) of the second transmitter control unit 41, the CPU reads a program stored in a storage device realized by a ROM or the like to a temporary storage unit realized by a RAM or the like. It can be realized by executing.

The rainfall information acquisition unit 44 acquires rainfall information from an external device (not shown) via the second transmission device communication unit 43. Here, the rainfall information is information indicating an area where there is a predetermined amount of rain (or an area where it is estimated that there is a predetermined amount of rain) in the broadcast area. The rainfall information acquisition unit 44 does not need to acquire the rainfall information in real time, and may acquire it as rainfall prediction information in advance, for example. Hereinafter, an area having a predetermined amount of rainfall is referred to as a rainfall area. The rainfall information acquisition unit 44 may be, for example, weather information provided by a weather information service as the rain information. Moreover, the rainfall information acquisition part 44 may acquire rainfall information from each receiving device 5 in the broadcast area. Specifically, when the receiving device 5 is wirelessly connected to the second transmitting device 4, the receiving device 5 is provided with position information indicating the position of the connected base station and a feeling that the receiving device 5 is installed in the base station. The rainfall data detected by the rain sensor is transmitted to the second transmitter 4. Further, when the reception device 5 has a GPS (Global Positioning System) function and an atmospheric pressure measurement function, the reception device 5 transmits position information based on the GPS function and weather prediction information based on the atmospheric pressure measurement function to the second transmission device 4. .

The rainfall information acquisition unit 44 outputs the acquired rainfall information to the access control determination unit 45. It is assumed that the rainfall information acquisition unit 44 acquires rainfall information from an external device at a predetermined interval. Further, the rainfall information acquisition unit 44 may actively acquire rainfall information at an arbitrary timing.

When receiving a content request (content transmission request) from the receiving device 5, the access control determining unit 45 determines whether the receiving device 5 is permitted or denied access to the second transmitting device 4 (multicast server). In other words, the access control determination unit 45 determines whether or not the reception device 5 is a hybrid transmission target that transmits data from the first transmission device 3 and the second transmission device 4. In the present embodiment, the receiving device 5 that has transmitted the content request during the rainfall period is set as a hybrid transmission target.

Specifically, when the access control determination unit 45 acquires the rain information from the rain information acquisition unit 44, the access control determination unit 45 determines that the rain period is raining in any of the broadcast areas, and multicast distribution by communication. Is in a possible state. When receiving the content request from the receiving device 5, the access control determining unit 45 determines that access is permitted during the rainy period, and transmits the second content so that the multicast address for connecting to the multicast server is transmitted to the receiving device 5. The transmission unit 46 is instructed. On the other hand, the access control determination unit 45 receives the content request from the receiving device 5, determines that access is denied unless it is during the rainy period, and receives a notification indicating that the connection to the multicast server is rejected without transmitting the multicast address. The second content transmission unit 46 is instructed to transmit to the device 5. When the second transmission device 4 determines that access is denied, the second transmission device 4 may not transmit a notification indicating connection refusal to the reception device 5.

The second content transmission unit 46 transmits a multicast address or a notification indicating connection refusal to the receiving device 5 that is the transmission destination of the content request based on an instruction from the access control determination unit 45. Note that the second content transmission unit 46 may change the multicast address every predetermined period (for example, every time rainfall information is acquired), and may not use the address once used for a certain period.

When the second content transmission unit 46 receives the Join message from the reception device 5, the second content transmission unit 46 acquires the content from the content server 7 and transmits the acquired content (multicast data) to the reception device 5 via the communication network 8. When the second content transmitting unit 46 receives the leave message from the receiving device 5, the second content transmitting unit 46 ends the multicast data transmission.

The second transmission device storage unit 42 stores programs, data, and the like referred to by the second transmission device control unit 41. For example, the second transmission device storage unit 42 may store rainfall information and content data.

In the present embodiment, the transmission device 2 and the content server 7 are separate bodies, but may be integrated. That is, content data may be stored in at least one of the storage units of the first transmission device 3 and the second transmission device 4.

(Receiver)
The reception device 5 includes a reception device control unit 51, a reception device storage unit 52, a reception device reception unit 53, a reception device communication unit 54, a display unit 55, and an audio output unit 56. The receiving device 5 may include a member such as an operation unit, but the member is not shown because it is not related to the feature point of the invention.

The receiving device receiving unit 53 receives broadcast waves and receives data transmitted from other devices such as the first transmitting device 3. For example, the receiving device receiving unit 53 is a receiving antenna.

The reception device communication unit 54 communicates with other devices such as the second transmission device 4 by wireless communication means or wired communication means, and exchanges data in accordance with instructions from the reception device control unit 51.

The display unit 55 displays an image in accordance with an instruction from the receiving device control unit 51. The display unit 55 only needs to display an image in accordance with an instruction from the reception device control unit 51. For example, an LCD (liquid crystal display), an organic EL display, a plasma display, or the like can be applied.

The audio output unit 56 converts the electrical signal output from the receiving device control unit 51 into sound and outputs the sound to the outside of the receiving device 5. The audio output unit 56 is a so-called speaker.

The reception device control unit 51 performs various operations by executing a program read from the reception device storage unit 52 to a temporary storage unit (not shown), and comprehensively controls each unit included in the reception device 5. To do.

In the present embodiment, the reception device control unit 51 includes a content reception unit 61, a reception state determination unit 62, a content acquisition unit 63, a switching unit 64, a decryption unit 65, and an output unit 66 as functional blocks. In each of the functional blocks (61 to 66) of the receiving device control unit 51, the CPU reads a program stored in a storage device realized by a ROM or the like into a temporary storage unit realized by a RAM or the like and executes the program. This can be achieved.

The content reception unit 61 receives content data (normal broadcast data, normal data) transmitted from the first transmission device 3 by broadcast waves via the reception device reception unit 53. The content receiving unit 61 outputs the received normal broadcast data to the switching unit 64.

The reception state determination unit 62 measures the reception state of the radio wave of the reception device reception unit 53 and determines whether the reception state is “good”, “unstable”, or “unreceivable”. . Specifically, the reception state determination unit 62 sets a first threshold value and a second threshold value (first threshold value> second threshold value), measures a signal quality CN ratio (Carrier to Noise Ratio). If the CN ratio is greater than or equal to the first threshold, it is determined as “good”, if the CN ratio is less than the first threshold and greater than or equal to the second threshold, it is determined as “unstable”, and if the CN ratio is less than the second threshold, It is determined that “cannot be received”. The reception state determination unit 62 notifies the determination result to the content acquisition unit 63 and the switching unit 64. Note that the reception state determination unit 62 measures and determines the reception state of the reception device reception unit 53 at predetermined intervals. The reception state determination unit 62 may actively measure and determine the reception state at an arbitrary timing.

The content acquisition unit 63 acquires the determination result from the reception state determination unit 62, and when the reception state of the reception device reception unit 53 is “unstable” or “unreceivable” (not “good”), communication is performed. The content request is transmitted to the second transmission device 4 via the network 8. Note that the content acquisition unit 63 may transmit the IP address of the receiving device 5 as a content request.

When the content acquisition unit 63 receives a multicast address as a response to the content request, the content acquisition unit 63 transmits a Join message for participating in the multicast address to the second transmission device 4. Then, the content acquisition unit 63 acquires content data (multicast data) from the second transmission device 4. The content acquisition unit 63 outputs the acquired multicast data to the switching unit 64.

When the content acquisition unit 63 is notified that the reception state of the reception device reception unit 53 is “good” from the reception state determination unit 62 while acquiring the multicast data, the content acquisition unit 63 notifies the second transmission device 4 Send a leave message to leave the multicast address and end the acquisition of multicast data.

The switching unit 64 acquires the normal broadcast data from the content reception unit 61 and the multicast data from the content acquisition unit 63, and based on the determination result notified from the reception state determination unit 62, the acquired normal broadcast data or multicast data Is output to the decoding unit 65. Specifically, the switching unit 64 outputs the normal broadcast data to the decoding unit 65 when the reception state of the receiving device receiving unit 53 is “good”. In addition, the switching unit 64 outputs the normal broadcast data to the decoding unit 65 when the reception state of the receiving device receiving unit 53 is “unstable”. Further, the switching unit 64 outputs multicast data to the decoding unit 65 when the reception state of the reception device reception unit 53 is “reception impossible”.

The decoding unit 65 acquires normal broadcast data or multicast data from the switching unit 64, decodes the acquired data, and outputs the decoded data to the output unit 66.

The output unit 66 outputs the data decoded by the decoding unit 65 to the display unit 55 and the audio output unit 56 to reproduce the content.

The receiving device storage unit 52 stores programs, data, and the like referred to by the receiving device control unit 51.

Note that the reception device reception unit 53 may be equipped with a signal quality CN ratio measurement function during broadcast reception, and the reception device communication unit 54 may be equipped with an access function to a multicast server. Thereby, it is possible to prevent the user from operating the receiving device 5 illegally and accessing the multicast server.

[Processing of transmitter and receiver]
Next, the processing flow of the transmission device 2 and the reception device 5 will be described with reference to FIG. FIG. 2 is a sequence diagram illustrating an example of a processing flow of the transmission device 2 and the reception device 5. FIG. 2 shows an example in which there is no rain in the broadcast area at the beginning of the broadcast, but it rains in the broadcast area on the way.

As shown in FIG. 2, first, the first content transmission unit 34 of the first transmission device 3 starts transmitting content to the reception device 5 by broadcasting (S101). Since the content receiving unit 61 of the receiving device 5 receives the content and it is not raining, the reception state determining unit 62 determines that the state is “good”. Since the determination result is “good”, the switching unit 64 outputs the normal broadcast data received by the content receiving unit 61 to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content (S102).

Here, when it rains in the broadcast area, the rainfall information acquisition unit 44 of the second transmission device 4 acquires the rainfall information (S103), and the access control determination unit 45 starts multicast distribution (S104).

On the other hand, when it rains in the broadcast area, the reception state of the reception device reception unit 53 of the reception device 5 deteriorates, and the reception state determination unit 62 determines that the reception state is “unstable” (S105). The content acquisition unit 63 transmits the IP address of the reception device 5 to the second transmission device 4 as a content request (S106).

When receiving the content request from the receiving device 5, the access control determination unit 45 of the second transmission device 4 determines that it is during the rain period because the rainfall information acquisition unit 44 has acquired the rain information (S107), Access to the multicast server of the receiving device 5 that has transmitted the content request is permitted (S108). Then, the access control determination unit 45 instructs the second content transmission unit 46 to transmit the multicast address to the reception device 5, and the second content transmission unit 46 transmits the multicast address to the reception device 5. (S109).

Upon acquiring the multicast address, the content acquisition unit 63 of the reception device 5 transmits a Join message to the second transmission device 4 (S110). The second content transmission unit 46 of the second transmission device 4 multicast-registers the reception device 5, acquires the content from the content server 7, and acquires the acquired content (multicast data) via the communication network 8. Send to. The content acquisition unit 63 of the receiving device 5 acquires multicast data and outputs it to the switching unit 64 (S111).

Here, when the rain leg becomes strong and the reception state further deteriorates, the reception state determination unit 62 of the reception device 5 determines that the reception state is “reception impossible” (S112). The switching unit 64 switches the data output to the decoding unit 65 from normal broadcast data to multicast data based on the determination result of the reception state determination unit 62 (S113). The decryption unit 65 decrypts the multicast data, and the output unit 66 reproduces the content (S114).

Thereafter, when the reception state is recovered and the reception state determination unit 62 determines that the reception state is “unstable”, the switching unit 64 outputs data to the decoding unit 65 based on the determination result of the reception state determination unit 62. Is switched from multicast data to normal broadcast data.

Further, when the reception state further recovers and the reception state determination unit 62 determines that the reception state is “good” (S115), the content acquisition unit 63 of the reception device 5 is based on the determination result of the reception state determination unit 62. Then, a leave message is transmitted to the second transmitter 4 to leave the multicast address, and the acquisition of multicast data is terminated. Moreover, the 2nd content transmission part 46 of the 2nd transmitter 4 will complete | finish transmission of multicast data, if a leave message is received (S116).

In this way, the receiving device 5 can acquire content (components) via communication at the time of rain, and the current rain-compatible broadcast has low quality, whereas the content having the same quality as the normal broadcast is received. Can be viewed. On the other hand, when it is not raining, the receiving device 5 can be prevented from acquiring content via communication.

<Embodiment 2>
The second embodiment of the present invention will be described with reference to FIGS. 3 and 4 as follows. In the present embodiment, the transmitting device specifies the location (location area) of the receiving device from the IP address of the receiving device, and the content by communication with respect to the receiving device located in the rain area specified based on the rain information. Send. For convenience of explanation, members having the same functions as those shown in the first embodiment are given the same reference numerals, and explanation thereof is omitted. Specifically, in the second embodiment, a part of the configuration of the first transmission device is different from that of the first transmission device. Hereinafter, differences from the first embodiment will be mainly described.

[Configuration of Second Transmitting Device]
First, based on FIG. 3, the structure of the 2nd transmitter 4a which concerns on Embodiment 2 is demonstrated. FIG. 3 is a block diagram illustrating an example of the configuration of the transmission system 1a according to the second embodiment and the transmission device 2a and the reception device 5 included in the transmission system 1a.

The second transmission device 4a transmits content to the reception device 5 via a communication network. As illustrated in FIG. 3, the second transmission device 4 a includes a second transmission device control unit 41 a, a second transmission device storage unit 42, and a second transmission device communication unit 43. The second transmission device 4a may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The second transmission device control unit 41a performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and is included in the second transmission device 4a. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41a includes, as functional blocks, a rainfall information acquisition unit 44, an access control determination unit (determination unit) 45a, a second content transmission unit (second transmission unit) 46, and a rainfall area specification. The unit (determination means) 47 is provided. Each functional block (44, 45a, 46, 47) of the second transmission device control unit 41a is a temporary storage in which the CPU stores a program stored in a storage device realized by a ROM or the like. This can be realized by reading out to the unit and executing it.

The rain area specifying unit 47 acquires the rain information from the rain information acquiring unit 44 and specifies the rain area based on the rain information. The rainfall area specifying unit 47 outputs the specified rain area to the access control determination unit 45a.

When the content request is received from the receiving device 5, the access control determining unit 45a determines whether the receiving device 5 is permitted or denied access to the second transmitting device 4a (multicast server). In other words, the access control determination unit 45a determines whether or not the reception device 5 is a hybrid transmission target that transmits data from the first transmission device 3 and the second transmission device 4a. In the present embodiment, the receiving device 5 in the rainfall area is a hybrid transmission target.

Specifically, when the access control determination unit 45a acquires the rain area from the rain area identification unit 47, it determines that it is raining in the broadcast area, and enables the multicast distribution by communication. When the access control determination unit 45a receives an IP address as a content request from the receiving device 5, the access control determining unit 45a refers to information in which the IP address of the receiving device 5 and the location (location area) of the receiving device 5 are associated with each other. The location (location area) of the receiving device 5 that has made the content request is specified. The access control determination unit 45 a determines whether or not the specified location (location area) of the receiving device 5 is included in the rain area specified by the rain area specifying unit 47. When the access control determination unit 45a determines that the location of the reception device 5 is included in the rainfall area, the access control determination unit 45a instructs the second content transmission unit 46 to transmit a multicast address for connection to the multicast server to the reception device 5. To do. On the other hand, if the access control determination unit 45 determines that the location of the reception device 5 is not included in the rainfall area, the access control determination unit 45 transmits a notification indicating connection refusal to the multicast server to the reception device 5 without transmitting the multicast address. The second content transmitting unit 46 is instructed as described above. If the second transmission device 4a determines that access is denied, the second transmission device 4a may not transmit a notification indicating connection refusal to the reception device 5.

The access control determination unit 45a identifies the location (location area) of the receiving device 5 based on the IP address, but is not limited thereto. For example, the access control determination unit 45a sets the receiving device 5 based on a service area code (ARIB TR-B14), a zip code, a fixed telephone number, or the like for broadcasting area identification that is set when the receiving device 5 starts broadcasting reception. The location (location area) may be specified. Further, when the receiving device 5 is wirelessly connected to the multicast server, the access control determination unit 45a may identify the location (location area) of the receiving device 5 based on the position information of the connected base station. Good. In addition, when the receiving device 5 has a GPS function, the access control determination unit 45a may identify the location (location area) of the receiving device 5 based on position information based on the GPS function of the receiving device 5. Good.

Alternatively, the receiving device 5 may specify the rain area and transmit the specifying result to the second transmitting device 4a.

[Processing of transmitter and receiver]
Next, the processing flow of the transmission device 2a and the reception device 5 will be described with reference to FIG. FIG. 4 is a sequence diagram illustrating an example of a processing flow of the transmission device 2a and the reception device 5. FIG. 4 shows an example in which there is no rain in the broadcast area at the beginning of the broadcast, but it falls in the broadcast area on the way.

As shown in FIG. 4, first, the first content transmission unit 34 of the first transmission device 3 starts transmission of content to the reception device 5 by broadcasting (S201). Since the content receiving unit 61 of the receiving device 5 receives the content and it is not raining, the reception state determining unit 62 determines that the state is “good”. Since the determination result is “good”, the switching unit 64 outputs the normal broadcast data received by the content receiving unit 61 to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content (S202).

Here, when it rains in the broadcast area, the rain information acquisition unit 44 of the second transmission device 4a acquires the rain information (S203), and the rain area specifying unit 47 specifies the rain area based on the rain information ( S204). When the rain area specifying unit 47 specifies the rain area, the access control determination unit 45 starts multicast distribution (S205).

On the other hand, when it rains in the broadcast area, the reception state of the reception device reception unit 53 of the reception device 5 deteriorates, and the reception state determination unit 62 determines that the reception state is “unstable” (S206). The content acquisition unit 63 transmits the IP address of the reception device 5 to the second transmission device 4a as a content request (S207).

When receiving the IP address from the receiving device 5, the access control determining unit 45 a of the second transmitting device 4 a specifies the location of the receiving device from the IP address. Then, the access control determination unit 45a determines whether or not the location of the receiving device 5 is within the rainfall area, and permits the receiving device 5 located within the raining area to access the multicast server (S208). ). Then, the access control determination unit 45 a instructs the second content transmission unit 46 to transmit the multicast address to the reception device 5, and the second content transmission unit 46 transmits the multicast address to the reception device 5. (S209).

Upon acquiring the multicast address, the content acquisition unit 63 of the reception device 5 transmits a Join message to the second transmission device 4a (S210). The second content transmission unit 46 of the second transmission device 4 a multicast-registers the reception device 5, acquires content from the content server 7, and acquires the acquired content (multicast data) via the communication network 8. Send to. The content acquisition unit 63 of the receiving device 5 acquires the multicast data and outputs it to the switching unit 64 (S211).

Here, when the rain leg becomes strong and the reception state further deteriorates, the reception state determination unit 62 of the reception device 5 determines that the reception state is “reception impossible” (S212). The switching unit 64 switches the data output to the decoding unit 65 from the normal broadcast data to the multicast data based on the determination result of the reception state determination unit 62 (S213). The decryption unit 65 decrypts the multicast data, and the output unit 66 reproduces the content (S214).

When the reception state further recovers and the reception state determination unit 62 determines that the reception state is “good” (S215), the content acquisition unit 63 of the reception device 5 determines the reception state based on the determination result of the reception state determination unit 62. Then, a leave message is transmitted to the second transmitter 4a, the multicast address is left, and acquisition of the multicast data is terminated. In addition, when the second content transmission unit 46 of the second transmission device 4a receives the leave message, the second content transmission unit 46 ends the transmission of the multicast data (S216).

In this way, the receiving device 5 in the rainfall area can acquire the content (component) via communication, and the current quality of broadcasting corresponding to rain was low, but the same quality as normal broadcasting Can be viewed. On the other hand, it is possible to prevent the receiving device 5 outside the rainfall area from acquiring content via communication.

<Embodiment 3>
Embodiment 3 of the present invention will be described below with reference to FIGS. 5 and 6. In the present embodiment, the transmission device divides the broadcast area into a plurality of subareas, counts content requests from the reception device for each subarea, and identifies a subarea having a predetermined number of content requests as a rainfall area. The content is transmitted by communication to the receiving device located in the specified rainfall area. For convenience of explanation, members having the same functions as those shown in the first embodiment are given the same reference numerals, and explanation thereof is omitted. Specifically, in the third embodiment, some configurations of the second transmitting device and the receiving device are different from those of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

[Configuration of receiving apparatus]
First, based on FIG. 5, the structure of the receiver 5b which concerns on Embodiment 3 is demonstrated. FIG. 5 is a block diagram illustrating an example of the configuration of the transmission system 1b according to the third embodiment and the transmission device 2b and the reception device 5b included in the transmission system 1b.

The receiving device 5b receives content transmitted from the transmitting device 2b. As illustrated in FIG. 5, the reception device 5b includes a reception device control unit 51b, a reception device storage unit 52, a reception device reception unit 53, a reception device communication unit 54, a display unit 55, and an audio output unit 56. The receiving device 5b may include a member such as an operation unit, but the member is not shown because it is not related to the feature point of the invention.

The reception device control unit 51b performs various calculations by executing a program read from the reception device storage unit 52 to a temporary storage unit (not shown), and comprehensively controls each unit included in the reception device 5b. To do.

In the present embodiment, the reception device control unit 51b includes a content reception unit 61, a reception state determination unit 62, a content acquisition unit 63b, a switching unit 64, a decryption unit 65, an output unit 66, and a position information specifying unit 67 as functional blocks. It is the composition provided. In each functional block (61, 62, 63b, 64 to 67) of the receiving device control unit 51, the CPU temporarily stores the program stored in the storage device realized by the ROM or the like, realized by the RAM or the like. This can be realized by reading out to the unit and executing it.

The position information specifying unit 67 acquires the determination result from the reception state determination unit 62, and when the reception state of the reception device reception unit 53 is “unstable” or “unreceivable” (when it is not “good”), The position information indicating the location (location area) of the receiving device 5b is specified. The position information specifying unit 67 outputs the specified position information to the content acquisition unit 63b.

The position information specified by the position information specifying unit 67 may be, for example, the IP address of the receiving device 5b, or a service area code (ARIB TR-B14) for broadcast area identification set by the receiving device 5b at the start of broadcast reception. It may be a postal code or a fixed telephone number, or if the receiving device 5b is wirelessly connected, it may be the location information of the connected base station, or if the receiving device 5b has a GPS function, The position information based on the GPS function of the device 5b may be used. The position information may include multiple types of information. For example, the location information may include an IP address and a service area code.

When the content acquisition unit 63b acquires the position information from the position information specifying unit 67, the content acquisition unit 63b transmits the content request and the position information to the second transmission device 4b via the communication network 8. Note that the content acquisition unit 63b may transmit the IP address of the receiving device 5b as a content request. When the position information is an IP address, the content acquisition unit 63b may transmit only the IP address.

When the content acquisition unit 63b receives a multicast address as a response to the content request, the content acquisition unit 63b transmits a Join message for participating in the multicast address to the second transmission device 4b. Then, the content acquisition unit 63b acquires content data (multicast data) from the second transmission device 4b. The content acquisition unit 63b outputs the acquired multicast data to the switching unit 64.

When the content acquisition unit 63b is notified that the reception state of the reception device reception unit 53 is “good” from the reception state determination unit 62 while acquiring the multicast data, the content acquisition unit 63b Send a leave message to leave the multicast address and end the acquisition of multicast data.

[Configuration of Second Transmitting Device]
Next, based on FIG. 5, the structure of the 2nd transmission apparatus 4b which concerns on Embodiment 3 is demonstrated.

The second transmission device 4b transmits content to the reception device 5b via a communication network. As illustrated in FIG. 5, the second transmission device 4 b includes a second transmission device control unit 41 b, a second transmission device storage unit 42, and a second transmission device communication unit 43. The second transmission device 4b may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The second transmission device control unit 41b performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and the second transmission device 4b includes the second transmission device control unit 41b. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41b includes, as functional blocks, an access control determination unit (determination unit) 45b, a second content transmission unit (second transmission unit) 46, and a rainfall area identification unit (determination unit) 47b. It is the structure provided with. In each functional block (45b, 46, 47b) of the second transmitter control unit 41b, the CPU stores the program stored in the storage device realized by the ROM or the like in the temporary storage unit realized by the RAM or the like. This can be realized by reading and executing.

The rain area specifying unit 47b receives the content request and the position information from the receiving device 5b, and counts the number of content requests transmitted from the receiving device 5b for each of a plurality of areas obtained by dividing the broadcast area. Then, the rainfall area specifying unit 47b specifies an area where a predetermined number or more of receiving apparatuses that have transmitted the content requests are present as the rain area. The rain area specifying unit 47b outputs the specified rain area to the access control determination unit 45b.

When receiving a content request from the receiving device 5, the access control determining unit 45 b determines permission / denial of access to the second transmitting device 4 b (multicast server) of the receiving device 5. In other words, the access control determination unit 45b determines whether or not the reception device 5b is a hybrid transmission target that transmits data from the first transmission device 3 and the second transmission device 4b. In the present embodiment, the receiving device 5b in the rainfall area is a hybrid transmission target.

Specifically, when the access control determination unit 45b acquires the rain area from the rain area specifying unit 47b, it determines that it is raining in the broadcast area, and enables the multicast distribution by communication. When the access control determination unit 45b receives the content request and the location information of the reception device 5b from the reception device 5b, the access control determination unit 45b identifies the location (location area) of the reception device 5b that has made the content request based on the received location information. To do. The access control determination unit 45b determines whether or not the location (location area) of the specified receiving device 5b is included in the rain area specified by the rain area specifying unit 47b. When the access control determination unit 45b determines that the location of the reception device 5b is included in the rain area, the access control determination unit 45b instructs the second content transmission unit 46 to transmit a multicast address for connection to the multicast server to the reception device 5b. To do. On the other hand, if the access control determination unit 45b determines that the location of the reception device 5b is not included in the rainfall area, the access control determination unit 45b transmits a notification indicating connection refusal to the multicast server to the reception device 5b without transmitting the multicast address. The second content transmitting unit 46 is instructed as described above. If the second transmission device 4b determines that access is denied, the second transmission device 4b may not transmit a notification indicating connection refusal to the reception device 5b.

When the IP address is a content request and the location information of the reception device 5b, the access control determination unit 45b receives only the IP address as the content request and the location information of the reception device 5b from the reception device 5b. To do.

Further, when the received position information includes a plurality of types of information (for example, when an IP address and a service area code are included), the access control determination unit 45b receives the reception device based on any information. The location (location area) of 5b may be specified, or the location (location area) of the receiving device 5b may be specified based on a plurality of types of information. When a priority is assigned for each type of position information, the access control determination unit 45b may specify the location (location area) of the receiving device 5b based on information with a high priority.

[Processing of transmitter and receiver]
Next, the processing flow of the transmission device 2b and the reception device 5b will be described with reference to FIG. FIG. 6 is a sequence diagram illustrating an example of a processing flow of the transmission device 2b and the reception device 5b. FIG. 6 shows an example in which there is no rain in the broadcast area at the beginning of the broadcast, but it falls in the broadcast area on the way.

As shown in FIG. 6, first, the first content transmission unit 34 of the first transmission device 3 starts transmitting content to the reception device 5b by broadcasting (S301). Since the content receiving unit 61 of the receiving device 5b receives the content and it is not raining, the reception state determining unit 62 determines that the state is “good”. Since the determination result is “good”, the switching unit 64 outputs the normal broadcast data received by the content receiving unit 61 to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content (S302).

Here, when it rains in the broadcast area, the reception state of the reception device reception unit 53 of the reception device 5b deteriorates, and the reception state determination unit 62 determines that the reception state is “unstable” (S303). The position information specifying unit 67 specifies position information indicating the location (location area) of the receiving device 5b (S304). Then, the content acquisition unit 63b transmits the IP address of the reception device 5b to the second transmission device 4b as a content request, or transmits the IP address and position information (S305).

When the rain area specifying unit 47b of the second transmitting device 4b receives the content request and the position information transmitted from the receiving device 5b, the rain area specifying unit 47b receives the content request transmitted from the receiving device 5b for each of a plurality of divided areas. The number is counted (S306). Then, if there is an area where a predetermined number or more of receiving apparatuses that have transmitted the content requests exist, the rain area specifying unit 47b specifies the area as a rain area (S307). When the access control determination unit 45 acquires the rain area from the rain area identification unit 47b, the access control determination unit 45 starts multicast distribution (S308).

Since it is raining continuously, the reception state determination unit 62 of the reception device 5b determines that the reception state is “unstable” (S309), and the position information specifying unit 67 specifies position information (S310). . Then, the content acquisition unit 63b transmits the IP address of the reception device 5b to the second transmission device 4b as a content request, or transmits the IP address and position information (S311).

When the access control determination unit 45b of the second transmission device 4b receives the content request and the position information from the reception device 5b, the location (location area) of the reception device 5b that has made the content request is the rainfall specified by the rainfall area specification unit 47b. If it is included in the area, access to the multicast server of the receiving device 5b that has transmitted the content request is permitted (S312). Then, the access control determination unit 45b instructs the second content transmission unit 46 to transmit the multicast address to the reception device 5b, and the second content transmission unit 46 transmits the multicast address to the reception device 5b. (S313).

Upon acquiring the multicast address, the content acquisition unit 63b of the reception device 5b transmits a Join message to the second transmission device 4b (S314). The second content transmission unit 46 of the second transmission device 4b multicast-registers the reception device 5b, acquires the content from the content server 7, and transmits the acquired content (multicast data) via the communication network 8 to the reception device 5b. Send to. The content acquisition unit 63b of the reception device 5b acquires multicast data and outputs it to the switching unit 64 (S315).

Here, when the rain leg becomes strong and the reception state further deteriorates, the reception state determination unit 62 of the reception device 5b determines that the reception state is “reception impossible” (S316). The switching unit 64 switches the data output to the decoding unit 65 from normal broadcast data to multicast data based on the determination result of the reception state determination unit 62 (S317). The decryption unit 65 decrypts the multicast data, and the output unit 66 reproduces the content (S318).

When the reception state further recovers and the reception state determination unit 62 determines that the reception state is “good” (S319), the content acquisition unit 63b of the reception device 5b is based on the determination result of the reception state determination unit 62. Then, a leave message is transmitted to the second transmitter 4b to leave the multicast address, and the acquisition of multicast data ends. Moreover, the 2nd content transmission part 46 of the 2nd transmitter 4b will complete | finish transmission of multicast data, if a leave message is received (S320).

<Embodiment 4>
The following describes Embodiment 4 of the present invention with reference to FIGS. 7 and 8. FIG. In this embodiment, the transmission device transmits normal broadcast data and base data whose quality is lower than that of the normal broadcast data by broadcasting, and transmits difference data between the normal broadcast data and the base data by communication when it rains. For convenience of explanation, members having the same functions as those shown in the first embodiment are given the same reference numerals, and explanation thereof is omitted. Specifically, the fourth embodiment differs from the first embodiment in the configuration of part of the transmission device and the reception device. Hereinafter, differences from the first embodiment will be mainly described.

[Configuration of First Transmitter]
First, based on FIG. 7, the structure of the 1st transmission device 3c which concerns on Embodiment 4 is demonstrated. FIG. 7 is a block diagram illustrating an example of the configuration of the transmission system 1c according to the fourth embodiment and the transmission device 2c and the reception device 5c included in the transmission system 1c.

The first transmission device 3c transmits content to the reception device 5c via the broadcast network. The first transmission device 3c includes a first transmission device control unit 31c, a first transmission device storage unit 32, and a first transmission device transmission unit 33. The first transmission device 3c may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The first transmission device control unit 31c performs various calculations by executing a program read from the first transmission device storage unit 32 to a temporary storage unit (not shown), and is included in the first transmission device 3c. It controls each part centrally.

In the present embodiment, the first transmission device control unit 31c includes a first content transmission unit (first transmission unit) 34, a hierarchical encoding unit 35, and a base data transmission unit (first transmission unit) 36 as functional blocks. It is a configuration. In each of the functional blocks (34 to 36) of the first transmission device control unit 31c, the CPU reads a program stored in a storage device realized by a ROM or the like to a temporary storage unit realized by a RAM or the like. It can be realized by executing.

The hierarchical encoding unit 35 obtains content from the content server, and base data (rain-supporting broadcast component or base) having a lower video / audio quality than the normal broadcast data (normal broadcast component) transmitted by the first content transmission unit 34. Layer coding) and differential data (enhancement layer component) based on the difference between normal broadcast data and base data are subjected to hierarchical coding processing. The hierarchical encoding unit 35 outputs the base data to the base data transmission unit 36, and outputs the difference data to the difference data transmission unit 48 of the second transmission device 4c.

When the base data transmission unit 36 acquires the rain information from the rain information acquisition unit 44 of the second transmission device 4c, the base data transmission unit 36 determines that the rain period is raining in any of the broadcast areas, and the base data is obtained. Then, the data is transmitted to the reception device 5c located in the broadcast area via the first transmission device transmission unit 33. That is, the base data transmission unit 36 transmits base data to the receiving device 5c by broadcasting during the rainy period.

[Configuration of Second Transmitting Device]
Next, based on FIG. 7, the structure of the 2nd transmitter 4c which concerns on Embodiment 4 is demonstrated.

The second transmission device 4c transmits content to the reception device 5c via the communication network. As illustrated in FIG. 7, the second transmission device 4 c includes a second transmission device control unit 41 c, a second transmission device storage unit 42, and a second transmission device communication unit 43. The second transmission device 4c may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The second transmission device control unit 41c performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and is included in the second transmission device 4c. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41c includes a rainfall information acquisition unit 44, an access control determination unit (determination unit) 45, and a differential data transmission unit (second transmission unit) 48 as functional blocks. . In each functional block (44, 45, 48) of the second transmission device control unit 41c, the CPU stores the program stored in the storage device realized by the ROM or the like in the temporary storage unit realized by the RAM or the like. This can be realized by reading and executing.

Based on the instruction from the access control determination unit 45, the difference data transmission unit 48 transmits a multicast address or a notification indicating connection refusal to the receiving device 5c that is the transmission destination of the content request. The difference data transmission unit 48 may change the multicast address every predetermined period (for example, every time rainfall information is acquired), and may not use the address once used for a certain period.

When the difference data transmission unit 48 receives the Join message from the reception device 5c, the difference data transmission unit 48 transmits the difference data output from the hierarchical encoding unit 35 to the reception device 5c via the communication network 8. When the difference data transmission unit 48 receives the leave message from the reception device 5c, the difference data transmission unit 48 ends the transmission of the difference data.

The access control determination unit 45 permits the access of the receiving device 5c that has transmitted the content request during the rainy period, as in the first embodiment, but is not limited thereto. For example, as in the second or third embodiment, the access control determination unit 45 may permit access only to the receiving device 5c located in the rainfall area.

[Configuration of receiving apparatus]
Next, based on FIG. 7, the structure of the receiver 5c which concerns on Embodiment 4 is demonstrated.

The receiving device 5c receives content transmitted from the transmitting device 2c. As illustrated in FIG. 7, the reception device 5c includes a reception device control unit 51c, a reception device storage unit 52, a reception device reception unit 53, a reception device communication unit 54, a display unit 55, and an audio output unit 56. The receiving device 5 may include a member such as an operation unit, but the member is not shown because it is not related to the feature point of the invention.

The reception device control unit 51c performs various calculations by executing a program read from the reception device storage unit 52 to a temporary storage unit (not shown), and comprehensively controls each unit included in the reception device 5c. To do.

In the present embodiment, the reception device control unit 51c includes a content reception unit 61c, a reception state determination unit 62, a content acquisition unit 63, a switching unit 64c, a decryption unit 65, an output unit 66, and a hierarchical decryption unit 68 as functional blocks. It is a configuration. In each functional block (61c, 62, 63, 64c, 65, 66, 68) of the receiving device control unit 51c, the CPU realizes the program stored in the storage device realized by the ROM or the like by the RAM or the like. This can be realized by reading out to the temporary storage unit and executing it.

The content reception unit 61c receives normal broadcast data transmitted from the first transmission device 3c by broadcast waves via the reception device reception unit 53 during normal times (when it is not a rainy period). On the other hand, during the rainy period, the content receiving unit 61c receives the normal broadcast data and the base data transmitted from the first transmitting device 3c by the broadcast wave via the receiving device receiving unit 53. The content reception unit 61c outputs the received normal broadcast data or the normal broadcast data and the base data to the switching unit 64.

The switching unit 64c acquires normal broadcast data or normal broadcast data and base data from the content reception unit 61c, and difference data from the content acquisition unit 63, and acquires based on the determination result notified from the reception state determination unit 62 The normal broadcast data is output to the decoding unit 65, or the acquired base data and difference data are output to the hierarchical decoding unit 68. Specifically, the switching unit 64 c outputs the normal broadcast data to the decoding unit 65 when the reception state of the receiving device receiving unit 53 is “good”. In addition, when the reception state of the reception device reception unit 53 is “unstable”, the switching unit 64 c outputs the normal broadcast data to the decoding unit 65. In addition, the switching unit 64 c outputs the base data and the difference data to the hierarchical decoding unit 68 when the reception state of the receiving device receiving unit 53 is “reception impossible”.

The hierarchical decoding unit 68 acquires the base data and the difference data from the switching unit 64c, performs hierarchical decoding processing on the base data and the difference data, and decodes the data to the same video / audio quality data as the normal broadcast data. The hierarchy decoding unit 68 outputs the decoded data to the output unit 66.

[Processing of transmitter and receiver]
Next, based on FIG. 8, the processing flow of the transmission device 2c and the reception device 5c will be described. FIG. 8 is a sequence diagram illustrating an example of a processing flow of the transmission device 2c and the reception device 5c. FIG. 8 shows an example in which there is no rain in the broadcast area at the beginning of the broadcast, but it falls in the broadcast area on the way.

As shown in FIG. 8, first, the first content transmission unit 34 of the first transmission device 3c starts transmission of normal broadcast data to the reception device 5c by broadcasting (S401). Since the content reception unit 61c of the reception device 5c receives the content and it has not rained, the reception state determination unit 62 determines that the state is “good”. Since the determination result is “good”, the switching unit 64 c outputs the normal broadcast data received by the content receiving unit 61 to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content (S402).

Here, when it rains in the broadcast area, the rainfall information acquisition unit 44 of the second transmission device 4c acquires the rainfall information (S403), and the access control determination unit 45 starts multicast distribution (S404). In addition, when the base data transmission unit 36 of the first transmission device 3c acquires the rainfall information from the rainfall information acquisition unit 44, the base data transmission unit 36 transmits the base data to the reception device 5c, and also starts the rain corresponding broadcast (S405).

On the other hand, when it rains in the broadcast area, the reception state of the reception device reception unit 53 of the reception device 5c deteriorates, and the reception state determination unit 62 determines that the reception state is “unstable” (S406). The content acquisition unit 63 transmits the IP address of the receiving device 5c to the second transmitting device 4c as a content request (S407).

At this time, the content receiver 61c receives the normal broadcast data and the base data from the first transmitter 3c, and outputs the normal broadcast data and the base data to the switching unit 64c. Since the determination result is “unstable”, the switching unit 64 c outputs the normal broadcast data to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content.

When receiving the content request from the receiving device 5c, the access control determination unit 45 of the second transmission device 4c determines that it is during the rain period because the rainfall information acquisition unit 44 has acquired the rain information (S408), The access to the multicast server of the receiving device 5c that has transmitted the content request is permitted (S409). Then, the access control determination unit 45 instructs the differential data transmission unit 48 to transmit the multicast address to the reception device 5c, and the differential data transmission unit 48 transmits the multicast address to the reception device 5c ( S410).

When the content acquisition unit 63 of the reception device 5c acquires the multicast address, the content acquisition unit 63 transmits a Join message to the second transmission device 4c (S411). The differential data transmission unit 48 of the second transmission device 4 c multicasts the reception device 5 c and transmits the differential data acquired from the hierarchical encoding unit 35 to the reception device 5 c via the communication network 8. The content acquisition unit 63 of the reception device 5c acquires the difference data and outputs it to the switching unit 64c (S412).

Here, when the rain leg becomes strong and the reception state further deteriorates, the reception state determination unit 62 of the reception device 5c determines that the reception state is “reception impossible” (S413). The switching unit 64c outputs the base data and the difference data to the hierarchical decoding unit 68 based on the determination result of the reception state determining unit 62 (S414). The hierarchical decoding unit 68 performs hierarchical decoding processing on the base data and the difference data, and the output unit 66 reproduces the same content as the normal broadcast data (S415).

Thereafter, when the reception state is recovered and the reception state determination unit 62 determines that the reception state is “unstable”, the switching unit 64c transmits the normal broadcast data to the decoding unit 65 based on the determination result of the reception state determination unit 62. Is output.

When the reception state further recovers and the reception state determination unit 62 determines that the reception state is “good” (S416), the content acquisition unit 63 of the reception device 5c is based on the determination result of the reception state determination unit 62. Then, a leave message is transmitted to the second transmission device 4c, the mobile station leaves the multicast address, and the acquisition of the difference data ends. Further, when receiving the leave message, the difference data transmission unit 48 of the second transmission device 4c ends the transmission of the difference data (S417).

In this way, viewers in the rain area can view content of the same quality as that of normal broadcast by switching to content playback based on base data transmitted by broadcast and difference data transmitted by communication at the time of rain. Become. In addition, even if the difference data is acquired only by communication, it is necessary to acquire base data via broadcasting in order to acquire a component of video quality that can withstand viewing, not video quality that can withstand viewing. For this reason, even if the receiving device 5c outside the broadcast area acquires only the difference data, the merit is low, and therefore it is possible to suppress illegal acquisition of the difference data from the receiving device outside the broadcast area via communication.

Note that the configuration of the present embodiment can also be applied to the configuration of the fifth embodiment described later.

<Embodiment 5>
Embodiment 5 of the present invention will be described below with reference to FIGS. 9 and 10. In the present embodiment, the transmission device transmits content by communication to the reception device located in the reception difficulty area where reception by broadcasting is difficult. In this embodiment, it is assumed that the receiving device is a mobile terminal such as a smartphone. For example, when receiving a normal broadcast by a smartphone in a train and entering a tunnel and it is difficult to receive the broadcast, Assume a case of connecting and switching to reception of the same component. For convenience of explanation, members having the same functions as those shown in the first embodiment are given the same reference numerals, and explanation thereof is omitted. Specifically, in the fifth embodiment, the configuration of a part of the second transmitter and the receiver is different from that of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

[Configuration of receiving apparatus]
First, based on FIG. 9, the structure of the receiver 5d which concerns on Embodiment 5 is demonstrated. FIG. 9 is a block diagram illustrating an exemplary configuration of the transmission system 1d according to the fifth embodiment and the transmission device 2d and the reception device 5d included in the transmission system 1d.

The receiving device 5d receives content transmitted from the transmitting device 2d. As illustrated in FIG. 9, the reception device 5d includes a reception device control unit 51d, a reception device storage unit 52, a reception device reception unit 53, a reception device communication unit 54, a display unit 55, and an audio output unit 56. The receiving device 5d may include a member such as an operation unit, but the member is not shown because it is not related to the feature of the invention.

The receiving device control unit 51d executes various programs by executing a program read from the receiving device storage unit 52 to a temporary storage unit (not shown), and comprehensively controls each unit included in the receiving device 5d. To do.

In the present embodiment, the reception device control unit 51d includes a content reception unit 61, a reception state determination unit 62, a content acquisition unit 63d, a switching unit 64, a decryption unit 65, an output unit 66, and a position information specifying unit 67 as functional blocks. It is the composition provided. In each functional block (61, 62, 63b, 64 to 67) of the receiving device control unit 51, the CPU temporarily stores the program stored in the storage device realized by the ROM or the like, realized by the RAM or the like. This can be realized by reading out to the unit and executing it.

The position information specifying unit 67 acquires the determination result from the reception state determination unit 62, and when the reception state of the reception device reception unit 53 is “unstable” or “unreceivable” (when it is not “good”), The position information indicating the location (location area) of the receiving device 5d is specified. The position information specifying unit 67 outputs the specified position information to the content acquisition unit 63d.

For example, when the receiving device 5d has a GPS function, the position information specified by the position information specifying unit 67 may be position information based on the GPS function of the receiving device 5d, or the receiving device 5d is wirelessly connected. In this case, it may be the location information of the connected base station, the IP address of the receiving device 5d, or the service area code (ARIB TR-B14) for broadcast area identification set by the receiving device 5d at the start of broadcast reception. ), Postal code or fixed telephone number. The position information may include multiple types of information. For example, the location information may include an IP address and a service area code.

When the content acquisition unit 63d acquires the position information from the position information specifying unit 67, the content acquisition unit 63d transmits the content request and the position information to the second transmission device 4b via the communication network 8. Note that the content acquisition unit 63d may transmit the IP address of the receiving device 5d as a content request. When the location information is an IP address, the content acquisition unit 63d may transmit only the IP address.

When receiving the multicast address as a response to the content request, the content acquisition unit 63d transmits a Join message for participating in the multicast address to the second transmission device 4d. Then, the content acquisition unit 63d acquires content data (multicast data) from the second transmission device 4d. The content acquisition unit 63d outputs the acquired multicast data to the switching unit 64.

When the content acquisition unit 63d is notified that the reception state of the reception device reception unit 53 is “good” from the reception state determination unit 62 while acquiring the multicast data, the content acquisition unit 63d Send a leave message to leave the multicast address and end the acquisition of multicast data.

Note that the position information specifying unit 67 specifies the position information of the receiving device 5d at a predetermined interval, and the content acquiring unit 63d transmits the position information to the second transmitting device 4d each time.

[Configuration of Second Transmitting Device]
Next, the configuration of the second transmission device 4d according to the fifth embodiment will be described with reference to FIG.

The second transmission device 4d transmits content to the reception device 5d via the communication network. As illustrated in FIG. 9, the second transmission device 4 d includes a second transmission device control unit 41 d, a second transmission device storage unit 42, and a second transmission device communication unit 43. The second transmission device 4d may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The second transmission device control unit 41d performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and the second transmission device 4d includes the second transmission device control unit 41d. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41d includes, as functional blocks, a difficult reception area information acquisition unit 44d, an access control determination unit (determination unit) 45d, a second content transmission unit (second transmission unit) 46, and a reception. The configuration includes a difficult area specifying unit 47d. Each functional block (44d, 45d, 46, 47d) of the second transmission device control unit 41d is a temporary storage in which the CPU stores a program stored in a storage device realized by a ROM or the like. This can be realized by reading out to the unit and executing it.

The difficult-to-receive area information acquisition unit 44d acquires difficult-to-receive area information from an external device (not shown) via the second transmission device communication unit 43. Here, the reception difficulty area information is information indicating an area (difficult reception area) in which it is difficult to receive broadcast radio waves (data) transmitted from the first transmission device 3. The reception difficulty area is, for example, in a tunnel, an underground mall, or a building.

The difficult-to-receive area information acquisition unit 44d outputs the acquired difficult-to-receive area information to the access control determination unit 45d. It is assumed that the difficult-to-receive area information acquisition unit 44d acquires difficult-to-receive area information from an external device at a predetermined interval. The difficult-to-receive area information acquisition unit 44d may actively acquire difficult-to-receive area information at an arbitrary timing. For example, when the first transmission device 3 starts broadcasting content, the difficult-to-receive area information acquisition unit 44d may acquire difficult-to-receive area information.

The difficult-to-receive area specifying unit 47d acquires the difficult-to-receive area information from the difficult-to-receive area information acquiring unit 44d, and specifies the difficult-to-receive area based on the difficult-to-receive area information. The difficult reception area specifying unit 47d outputs the specified difficult reception area to the access control determination unit 45d.

When receiving the content request from the receiving device 5d, the access control determining unit 45d determines whether the receiving device 5d is permitted or denied access to the second transmitting device 4d (multicast server). In other words, the access control determination unit 45d determines whether or not the reception device 5d is a hybrid transmission target that transmits data from the first transmission device 3 and the second transmission device 4d. In the present embodiment, the reception device 5d in the difficult reception area is set as a hybrid transmission target.

Specifically, when the access control determination unit 45d acquires the reception difficulty area from the reception difficulty area specifying unit 47d, the access control determination unit 45d determines that there is a reception difficulty area in the broadcast area, and enables multicast distribution by communication. Then, when the access control determination unit 45d receives the content request and the position information from the receiving device 5d, the location (location area) of the receiving device 5d that has made the content request is set to the reception difficulty area specified by the reception difficulty area specifying unit 47d. It is determined whether or not it is included. When the access control determination unit 45d determines that the location of the reception device 5d is included in the difficult reception area, the access control determination unit 45d notifies the second content transmission unit 46 to transmit a multicast address for connection to the multicast server to the reception device 5d. Instruct. On the other hand, if the access control determination unit 45d determines that the location of the reception device 5d is not included in the difficult reception area, the access control determination unit 45d transmits a notification indicating connection refusal to the multicast server to the reception device 5d without transmitting the multicast address. The second content transmission unit 46 is instructed to do so. When the second transmission device 4d determines that access is denied, the second transmission device 4d may not transmit a notification indicating connection refusal to the reception device 5d.

The access control determination unit 45d periodically acquires position information from the reception device 5d, and executes a determination as to whether or not the reception device 5d is located in the reception difficulty area at a predetermined interval.

Alternatively, the reception device 5d may specify the difficult reception area and transmit the specification result to the second transmission device 4d.

In addition, the access control determination unit 45d may combine the rain area and the reception difficulty area. For example, the access control determination unit 45d may permit access to the reception device 5d located in a rainy area or a reception difficulty area.

[Processing of transmitter and receiver]
Next, based on FIG. 10, the processing flow of the transmission device 2d and the reception device 5d will be described. FIG. 10 is a sequence diagram illustrating an example of a processing flow of the transmission device 2d and the reception device 5d. FIG. 10 shows an example in which the receiving device 5d moves from a place where broadcasting can be normally received to an area where reception is difficult.

As shown in FIG. 10, first, the first content transmitting unit 34 of the first transmitting device 3 starts transmitting content to the receiving device 5d by broadcasting (S501). Since the content receiving unit 61 of the receiving device 5d receives the content, and the receiving device 5d is outside the difficult reception area, the reception state determining unit 62 determines that it is in the “good” state. Since the determination result is “good”, the switching unit 64 outputs the normal broadcast data received by the content receiving unit 61 to the decoding unit 65. The decoding unit 65 decodes the normal broadcast data, and the output unit 66 reproduces the content (S502).

Here, the difficult reception area information acquisition unit 44d of the second transmission device 4d acquires the difficult reception area information (S503), and the difficult reception area specifying unit 47d specifies the difficult reception area based on the difficult reception area information (S504). ). The access control determination unit 45d starts multicast distribution when the reception difficulty area specifying unit 47d specifies the reception difficulty area (S505).

On the other hand, when the reception device 5d moves to the difficult reception area, the reception state of the reception device reception unit 53 of the reception device 5d deteriorates, and the reception state determination unit 62 determines that the reception state is “unstable” (S506). The content acquisition unit 63d transmits the IP address of the reception device 5d to the second transmission device 4d as a content request, or transmits the IP address and position information (S507).

When receiving the IP address or the IP address and the position information from the receiving device 5d, the access control determining unit 45d of the second transmitting device 4d specifies the location of the receiving device 5d from the IP address or the position information. Then, the access control determination unit 45d determines whether or not the location of the reception device 5d is in the difficult reception area, and permits the reception device 5d located in the difficult reception area to access the multicast server. (S508). Then, the access control determination unit 45d instructs the second content transmission unit 46 to transmit the multicast address to the reception device 5d, and the second content transmission unit 46 transmits the multicast address to the reception device 5d. (S509).

When the content acquisition unit 63d of the reception device 5d acquires the multicast address, the content acquisition unit 63d transmits a Join message to the second transmission device 4d (S510). The second content transmission unit 46 of the second transmission device 4d multicast-registers the reception device 5d, acquires the content from the content server 7, and transmits the acquired content (multicast data) to the reception device 5d via the communication network 8. Send to. The content acquisition unit 63d of the reception device 5d acquires the multicast data and outputs it to the switching unit 64 (S511).

Here, when the reception device 5d moves within the difficult reception area and the reception state is further deteriorated, the reception state determination unit 62 of the reception device 5d determines that the reception state is “reception impossible” (S512). The switching unit 64 switches the data output to the decoding unit 65 from normal broadcast data to multicast data based on the determination result of the reception state determination unit 62 (S513). The decryption unit 65 decrypts the multicast data, and the output unit 66 reproduces the content (S514).

When the reception device 5d moves out of the difficult reception area and the reception state further recovers and the reception state determination unit 62 determines that the reception state is “good” (S515), the content acquisition unit 63d of the reception device 5d Based on the determination result of the reception state determination unit 62, a leave message is transmitted to the second transmission device 4d, the mobile station leaves the multicast address, and the acquisition of the multicast data ends. Moreover, the 2nd content transmission part 46 of the 2nd transmitter 4d will complete | finish transmission of multicast data, if a leave message is received (S516).

By doing so, the receiving device 5d can view the same content as the normal broadcast by switching from the broadcast to the data acquisition via communication when it is difficult to receive the normal broadcast even when moving. It becomes.

[Example of software implementation]
The control blocks (particularly the first transmission device control unit 31, the second transmission device control unit 41, and the reception device control unit 51) of the first transmission device 3, the second transmission device 4, and the reception device 5 are integrated circuits (IC chips). It may be realized by a logic circuit (hardware) formed in the same manner, or may be realized by software using a CPU (Central Processing Unit).

In the latter case, the first transmitting device 3, the second transmitting device 4, and the receiving device 5 are a CPU that executes instructions of a program that is software that realizes each function, and the program and various data are read by a computer (or CPU). A ROM (Read Only Memory) or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) in which the program is expanded, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

<Embodiment 6>
Embodiment 6 of the present invention will be described with reference to FIGS. 11 to 17 as follows. In the present embodiment, the transmission device transmits a plurality of video contents via broadcasting and communication, and the reception device displays the video content according to display control information for display control of the received video content. In the present embodiment, it is assumed that the receiving apparatus receives a plurality of video contents via a communication network and displays the plurality of video contents superimposed on one screen. For convenience of explanation, members having the same functions as those shown in the first embodiment are given the same reference numerals, and explanation thereof is omitted. Specifically, in the sixth embodiment, some configurations of the second transmission device and the reception device are different from those of the first embodiment. Hereinafter, differences from the first embodiment will be mainly described.

[Configuration of receiving apparatus]
First, based on FIG. 11, the structure of the receiver 5e which concerns on Embodiment 6 is demonstrated. FIG. 11 is a block diagram illustrating an exemplary configuration of the transmission system 1e according to the sixth embodiment and the transmission device 2e and the reception device 5e included in the transmission system 1e.

The receiving device 5e receives the content transmitted from the transmitting device 2e. As illustrated in FIG. 11, the reception device 5e includes a reception device control unit 51e, a reception device storage unit 52, a reception device reception unit 53, a reception device communication unit 54, a display unit 55, and an audio output unit 56. The receiving device 5e may include a member such as an operation unit, but the member is not shown because it is not related to the feature of the invention.

The receiving device control unit 51e performs various calculations by executing a program read from the receiving device storage unit 52 to a temporary storage unit (not shown), and comprehensively controls each unit included in the receiving device 5e. To do.

In the present embodiment, the reception device control unit 51e includes a content reception unit 61, a content acquisition unit 63e, a decryption unit 65, and an output unit 66e as functional blocks. In each functional block (61, 63e, 65, 66e) of the receiving device control unit 51e, the CPU stores the program stored in the storage device realized by the ROM or the like in the temporary storage unit realized by the RAM or the like. This can be realized by reading and executing.

The content receiving unit 61 receives the video content transmitted from the first transmitting device 3 by broadcast waves via the receiving device receiving unit 53. The content receiving unit 61 outputs the received video content to the decoding unit 65.

The content acquisition unit 63e acquires the video content transmitted from the second transmission device 4e via communication and display control information for controlling the display of the video content. The content acquisition unit 63e outputs the acquired video content and display control information for controlling display of the video content to the output unit 66e.

Based on the display control information acquired by the content acquisition unit 63e, the output unit 66e superimposes the video content decoded by the decoding unit 65 and the video content acquired by the content acquisition unit 63e on one screen, and the superimposed video Data is output to the display unit 55.

[Configuration of Second Transmitting Device]
Next, based on FIG. 11, the structure of the 2nd transmission device 4e which concerns on Embodiment 6 is demonstrated.

The second transmission device 4e transmits content to the reception device 5e via the communication network. As illustrated in FIG. 11, the second transmission device 4 e includes a second transmission device control unit 41 e, a second transmission device storage unit 42, and a second transmission device communication unit 43. The second transmission device 4e may include members such as a display unit and an operation unit, but the members are not shown because they are not related to the feature points of the invention.

The second transmission device control unit 41e performs various calculations by executing a program read from the second transmission device storage unit 42 to a temporary storage unit (not shown), and is included in the second transmission device 4e. It controls each part centrally.

In the present embodiment, the second transmission device control unit 41e is configured to include only the second content transmission unit (second transmission unit) 46e as a functional block. In the second content transmission unit 46e of the second transmission device control unit 41e, the CPU reads a program stored in a storage device realized by a ROM or the like into a temporary storage unit realized by a RAM or the like and executes it. realizable.

The second content transmission unit 46e transmits the video content and the display control information to the reception unit 5e via the network 8.

[Receiver processing]
Next, based on FIG. 12 to FIG. 17, the flow of processing of the output unit 66e of the reception device 5e (display control method of the reception device 5e) will be described. FIG. 12 is a diagram showing an example of the relationship between the screen display area 101 and the designation area 102 for designating an area for superimposing video content or prohibiting video content superposition, and FIG. 13 superimposes a plurality of video contents. FIG. 14 is a diagram showing an example of the relationship between the screen display area 101 and designated areas 1 to 3 (110 to 112) on which video content is superimposed. FIG. 14 shows display control information acquired by the content acquisition unit 63e and video FIG. 15A is a diagram illustrating an example of a process flow for superimposing video content based on video parameters included in the content, and FIG. 15A is a diagram illustrating an example of video parameters included in the video content. FIG. 1B is a diagram illustrating an example of a table that specifies a list of a plurality of video contents to be superimposed and display / non-display of each video content. FIG. 16C is a diagram showing an example of a superposition position table that is referred to when superimposing video content in the designated areas 1 to 3 (110 to 112) in FIG. 13, and FIG. FIG. 17 is a diagram illustrating an example in which video content is superimposed based on the superposition position table, and FIG. 17 illustrates an example of a blank portion on which video content is superimposed when a region for which superimposition of video content is prohibited is designated as the designated region 102. FIG.

First, the relationship between the screen display area 101 and the designated area 102 will be described with reference to FIG. As shown in FIG. 12, the designated area 102 is designated by upper left coordinates (x, y), area width width, and height height.

Next, the flow of processing for superimposing video content will be described with reference to FIG. First, the output unit 66e specifies whether the information of the specified area included in the display control information output from the content acquisition unit 63e specifies an area on which video content is to be superimposed, or specifies an area on which video content is prohibited to be superimposed. Is determined (S601). In the case of designating an overlapping area (S601: Yes), it is determined whether or not a plurality of display areas are designated (S602). When a plurality of display areas are designated (S602, Yes), a list of video contents to be superimposed is acquired (S603). FIG. 15B shows an example of a list of video contents. In the present embodiment, it is assumed that display is specified for video contents having video_id of 2 to 4. Next, a superposition position table for specifying the superposition position is acquired (S604). FIG. 15C shows an example of the superposition position table. In this embodiment, for the designated area 1, the display position is 2-1, the scale factor is 0.7, the display reference is the upper left, and the z-index is 1. Here, with reference to FIG. 13, a method for designating the designated area will be described. As shown in FIG. 13, it is assumed that the screen display area 101 is divided into three areas in the row direction and four areas in the column direction. Since the display position of the designated area 1110 is 2-1, the area of 2 in the column direction and 1 in the row direction becomes the display area of the designated area 1110. Similarly, the display positions of the designated area 2 111 and the designated area 3 112 are 3-2 and 4-3, so that 3 areas are designated in the column direction, 2 in the row direction, 4 in the column direction, and 3 in the row direction, respectively. It becomes a display area of area 2 111 and designated area 3 112. The value of the scale factor is a magnification based on 1. The display standard is the center of the video content in the case of the upper left so that the upper left coordinate of the video content overlaps the upper left coordinate of the designated area. In the case of the lower right corner, the lower right coordinates of the video content are superimposed so as to overlap the lower right coordinates of the designated area. The z-index is information indicating the priority when the display areas overlap. When the display areas of the video content overlap, z-index is displayed superimposed on the front of the video content having a large z-index value. In the present embodiment, the designated area 2 111 → designated area 3 112 → designated area 1 110 are superimposed and displayed from the front. For the video contents of video_id2 to 3 (120 to 122), the display position / display size is determined based on the acquired video list and superposition position table information (S605), and the video is designated based on the calculated value. (S607). FIG. 16 shows an example in which the video contents of video_id2 to 3 (120 to 122) are superimposed on one screen based on the video content list of FIG. 15B and the superimposition position table of FIG. 15C. .

In this embodiment, the video content with video_id 2 to 3 (120 to 122) is a display target. However, the designation of the video content to be displayed may be changed by a user operation, and the second transmission device 4d By transmitting data for updating the table information, the number of video contents to be displayed may be changed even if the list of video contents is dynamically updated. Similarly, as shown in FIG. 15C, the display position, scale factor, display standard, and z-index values of the designated areas 1 to 3 (110 to 112) are designated, but these values are changed by the user's operation. The second transmission device 4d may transmit the data for updating the table information, so that the number of designated areas may be changed even if the superposition position table is dynamically updated.

If a plurality of display areas are not designated (No in S602), the top video content in the video list is acquired (S606), and the video is superimposed on the designated area (S607).

In the case of designating an area where video content superimposition is prohibited (No in S601), it is determined whether the display size of the top video content in the video list can be changed (S608). If the display size can be changed (S608, Yes), the video parameter of the target video content is acquired (S609). An example of the video parameter is shown in FIG. In the present embodiment, since the display area of the target video content is designated at the lower right, the size of the lower right margin is calculated (S610). FIG. 17 shows an example of the margin portion 103 calculated in the present embodiment.

Next, the display position / size of the video content is determined based on the calculated margin information (S611). In this embodiment, the display position of the target video content is specified so that the lower right coordinate of the video content overlaps the lower right coordinate of the blank area, and the display size is r_width and the display height r_height is r_width. = Width-o_width-x
r_height = height-o_height-y
It is calculated from. In the present embodiment, since the threshold value of the target video parameter is set to 0.5, if the video fits in the blank area (S612 Yes), that is, if the calculated display size r_width / height1 ≧ 0.5. Then, the target video content is superimposed on the blank area (S613).

When the display size cannot be changed (S608: No), and when the video does not fit in the margin area (S612: No), that is, when the calculated display size r_width / height1 <0.5, the video can be superimposed. “No” is displayed (S614), and the target video content is not superimposed.

In this embodiment, the video content is described as the content to be superimposed. However, the present invention is not limited to this, and is specified by a tag in the application described in the HTML (HyperText Markup Language) language. It doesn't matter.

In this embodiment, the display control information is acquired via the communication network. However, the present invention is not limited to this, and information set in advance by user input even if acquired via the broadcast network. However, you may use what combined those information.

[Summary]
A transmission device according to aspect 1 of the present invention is a transmission device that transmits content to a reception device, and includes a first transmission unit that transmits data constituting the content to the reception device via a first network; A second transmission means for transmitting data constituting the content to the receiving device via a second network different from the first network; and a hybrid transmission target for transmitting data from the first transmission means and the second transmission means. Determining means for determining whether or not it is a receiving apparatus, wherein the second transmitting means transmits data to the receiving apparatus determined by the determining means to be a hybrid transmission target.

According to the above configuration, the first transmitting unit transmits data to an arbitrary receiving device, and the second transmitting unit transmits data to a receiving device that is a hybrid transmission target. Therefore, a receiving apparatus that is a hybrid transmission target can receive data from the first transmission unit or the second transmission unit according to the reception states of the first network and the second network. In addition, a receiving apparatus that is not a hybrid transmission target cannot receive data from the first transmitting unit and receive data from the second transmitting unit.

Therefore, it is possible to prevent a receiving device that is not a hybrid transmission target from receiving data from the second transmission unit illegally, and to appropriately transmit content to the receiving device that is a hybrid transmission target by hybrid transmission. Therefore, there is an effect that the hybrid transmission can be appropriately performed with respect to the reception apparatus to be hybrid-transmitted.

The transmission apparatus according to aspect 2 of the present invention is the transmission apparatus according to aspect 1, wherein the determination unit includes the second transmission within a period in which there is a predetermined amount of rainfall in any of the transmission areas of the first transmission unit. You may determine with the receiving apparatus which transmitted the content request which requests | requires the content transmission from a means being a receiving apparatus of the said hybrid transmission object.

According to the above configuration, a receiving device that has transmitted a content request within a period of a predetermined amount of rain is set as a hybrid target. Here, the reception device can receive data from the second transmission unit even when the reception state of the first network is lowered during rain. On the other hand, when there is no predetermined amount of rain, the receiving device cannot receive data from the second transmitting means. Therefore, it is possible to appropriately perform hybrid transmission with respect to a receiving apparatus that should perform hybrid transmission.

In the transmission device according to aspect 3 of the present invention, in the above aspect 1, the determination unit is configured to transmit a reception device located in a rainfall area having a predetermined amount of rainfall in the transmission area of the first transmission unit to the hybrid transmission target. It may be determined that this is a receiving device.

According to the above configuration, the receiving device in the rainfall area is targeted for hybrid transmission. Here, even if the reception state of the first network is lowered during the rain, the receiving device in the rain area can receive data from the second transmitting means. On the other hand, a receiving device outside the rainfall area that can normally receive data from the first transmitting means cannot receive data from the second transmitting means. Therefore, it is possible to appropriately perform hybrid transmission with respect to a receiving apparatus that should perform hybrid transmission.

The transmission device according to aspect 4 of the present invention is the transmission apparatus according to aspect 1, wherein the determination unit is difficult to receive the data transmitted from the first transmission unit within the transmission area of the first transmission unit. You may determine with the receiving apparatus located in a difficult area being the receiving apparatus of the said hybrid transmission object.

According to the above configuration, a receiving device located in an area where reception is difficult is targeted for hybrid transmission. Even if the receiving device located in the difficult-to-receive area cannot receive data from the first transmitting means, it can receive the data from the second transmitting means. On the other hand, a receiving device outside the difficult-to-receive area that can normally receive data from the first transmitting means cannot receive data from the second transmitting means. Therefore, it is possible to appropriately perform hybrid transmission with respect to a receiving apparatus that should perform hybrid transmission.

In the transmission device according to aspect 5 of the present invention, in the above aspect 2, the determination unit is configured to provide rainfall in an area where a predetermined number or more of reception devices that have transmitted content requests for content transmission from the second transmission unit are located. It may be an area.

According to the above configuration, an area where a predetermined number or more of receiving apparatuses that have transmitted content requests are located is considered to be an area where it is difficult to receive data from the first transmitting means, that is, a rainfall area. Therefore, by setting the area where a predetermined number or more of the receiving apparatuses that have transmitted the content requests are located as the rain area, it is possible to appropriately perform hybrid transmission to the receiving apparatus that is to perform the hybrid transmission.

In the transmission device according to aspect 6 of the present invention, in any of the above aspects 1 to 5, the first transmission means transmits normal data to the reception apparatus determined by the determination means not to be a hybrid transmission target, The determination means transmits normal data and base data whose quality is lower than that of the normal data to the receiving apparatus determined to be a hybrid transmission target, and the second transmission means includes the normal data and the base data. The difference data may be transmitted.

According to the above configuration, the receiving device to be hybrid-transmitted can normally receive base data from the first transmitting unit, but can receive differential data from the second transmitting unit even when normal data cannot be received normally. Is received, the content having the same quality as the normal data can be reproduced from the base data and the difference data. On the other hand, a receiving apparatus that is not a hybrid transmission target cannot receive differential data from the second transmitting means. Further, since the difference data alone cannot reproduce the content having the same quality as that of the normal data, the illegal reception of data from the second transmission unit by the reception device outside the transmission area of the first transmission unit is suppressed. be able to. Therefore, it is possible to appropriately perform hybrid transmission with respect to a receiving apparatus that should perform hybrid transmission.

A transmission system according to aspect 7 of the present invention includes the transmission apparatus according to any one of aspects 1 to 6 and a reception apparatus that receives content transmitted from the transmission apparatus.

According to the above configuration, the transmission system has the same effect as the transmission device.

A transmission method according to aspect 8 of the present invention is a transmission method for transmitting content to a reception device, the first transmission step of transmitting data constituting the content to the reception device via a first network; In the determination step of determining whether or not the reception device is a hybrid transmission target that transmits data using two routes of the first network and the second network different from the first network, and in the determination step, the hybrid transmission target A second transmission step of transmitting data constituting the content to the receiving device determined to be present via the second network.

The transmission apparatus according to each aspect of the present invention may be realized by a computer. In this case, the transmission apparatus is realized by the computer by causing the computer to operate as each unit included in the transmission apparatus. A control program and a computer-readable recording medium on which the control program is recorded also fall within the scope of the present invention.

The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

The present invention can be used for a transmission device that transmits content.

1, 1a, 1b, 1c, 1d,

1e Transmission system

2, 2a, 2b, 2c, 2d, 2e

Transmission device

3, 3c

First transmission device

4, 4a, 4b, 4c, 4d, 4e

Second transmission device

5, 5b, 5c, 5d, 5e Receiver 34 First content transmitter (first transmitter)
35 Hierarchical encoding unit 36 Base data transmission unit (first transmission means)
44 Rainfall information acquisition unit 44a Difficult to receive area

information acquisition unit

45, 45a, 45b, 45d Access control determination unit (determination means)
46 2nd content transmission part (2nd transmission means)
47, 47b Rain area identification part (determination means)
47d Difficult to receive area identification unit 48 Differential data transmission unit (second transmission means)
67 Location information identification part

Claims

A transmitting device that transmits content to a receiving device,
First transmitting means for transmitting data constituting the content to the receiving device via a first network;
Second transmission means for transmitting data constituting the content to the receiving device via a second network different from the first network;
Determining means for determining whether or not the receiving apparatus is a hybrid transmission target receiving apparatus that transmits data from the first transmitting means and the second transmitting means;
The second transmission means transmits data to a receiving apparatus determined by the determination means to be a hybrid transmission target.
The determination means includes a receiving device that has transmitted a content request for requesting content transmission from the second transmission means within a period of a predetermined amount of rain in any of the transmission areas of the first transmission means. The transmission apparatus according to claim 1, wherein the transmission apparatus is determined to be a reception apparatus that is a target of the hybrid transmission.
2. The determination unit according to claim 1, wherein the determination unit determines that a reception device located in a rainfall area having a predetermined amount of rainfall in the transmission area of the first transmission unit is the reception device targeted for hybrid transmission. The transmitting device according to 1.
In the transmission area of the first transmission means, the determination means refers to a reception apparatus located in a difficult reception area where it is difficult to receive data transmitted from the first transmission means. The transmission device according to claim 1, wherein the transmission device is determined to be.
4. The transmission apparatus according to claim 3, wherein the determination means sets the area where a predetermined number or more of reception apparatuses that have transmitted content requests for requesting content transmission from the second transmission means are located as the rainfall area. .