JP2005065152A - Digital broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcasting receiver which does not delete viewer data during the reproduction and time difference reproduction of videotape recording data of digital broadcasting, and does not transmit unauthorized viewer data to a broadcasting operator. <P>SOLUTION: The digital broadcasting receiver comprises a reception control unit 2, first and second viewer data holding areas 4A and 5B, and a data broadcasting analysis unit 3. The reception control unit 2 determines whether the receiver is in a broadcasting radio wave reception status, a videotape recording program reproduction status, or a time difference reproduction status. The first and the second viewer data holding areas 4A and 5B hold viewer data. The data broadcasting analysis unit 3 refers to viewer data held in the first viewer data holding area 4A if a status informed from the reception control unit 2 is the broadcasting radio wave reception status, and refers to viewer data held in the second viewer data holding area 5B if a status informed from the reception control unit 2 is either the videotape recording program reproduction status or the time difference reproduction status. Videotape recording data are stored in a videotape recording data storage unit 6 together with viewer data held in the first viewer data holding area 4A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a digital broadcast receiver, and in particular, a data broadcast additional program broadcast in BS digital broadcast, broadband CS digital broadcast, terrestrial digital television broadcast, terrestrial digital radio broadcast, etc. (hereinafter referred to as “digital broadcast”), The present invention relates to a digital broadcast receiver used for independent data broadcasting or the like (hereinafter referred to as “data broadcasting”).

  A reference model of a conventional BS / broadband CS digital broadcast basic receiver is described in Non-Patent Document 1. In the 4.1.2 receiver reference model on page 3-6 of this document, the received radio wave is separated into video data, audio data, multimedia content data, subtitle data, and character super data. The configuration diagram for presenting is described. Furthermore, Non-Patent Document 2 discloses a receiver reference model for terrestrial digital television broadcasting.

  In addition, Non-Patent Documents 3 and 4 describe regulations on how to use a semiconductor memory (nonvolatile memory) that can retain stored contents even when the power is turned off. In data broadcasting, a nonvolatile memory area for storing information for each user of the receiver and unique information for each provider is called NVRAM.

Radio industry, “ARIB TR-B15 2.2 edition (first volume)”, BS / broadband CS digital broadcasting operation regulations, 4.1.2 Receiver reference model, pages 3-6 Radio Industry, ARIB TR-B14 1.3 Edition (1st volume), Digital Terrestrial Television Broadcasting Operation Regulations, 1.1.2 Receiver Reference Model, page 3-10 Radio Industry, “ARIB TR-B15 2.2 Edition (first volume)”, BS / Broadband CS Digital Broadcasting Operational Rules, 4.5.2 NVRAM, pp. 3-23 Radio Industry, ARIB TR-B14 1.3 Edition (first volume), Digital Terrestrial Television Broadcasting Operation Regulations, 1.4.2 NVRAM, page 3-22

  However, the above-described conventional system has the following problems when a data broadcast program is recorded and the recorded program is played back or played back with a time difference (time shift).

  First, the receiver has only one area (NVRAM) for storing the viewer's name, address, telephone number, game points acquired by the viewer, etc. (hereinafter referred to as “viewer data”). Every time the recorded data of the data broadcast to which the viewer data is written is reproduced or the time difference reproduction is performed, the viewer data is overwritten, so the reproduction of the recorded program is terminated and the state is changed to the broadcast wave reception state. At this time, the viewer data referred to in the broadcast radio wave reception state stored before the start of the recorded program reproduction is lost. For this reason, there is a problem that viewer data is lost when a digital data broadcast is recorded and repeatedly reproduced later.

  The second problem is that illegal viewer data is transmitted to a broadcaster when a recorded program of digital data broadcasting is reproduced or when time difference reproduction is performed. The reason is that, for example, after answering all the questions, if a quiz program that sends the number of correct answers to the broadcaster is broadcast, confirm the correct answer of the quiz while recording the program. After that, it is possible to perform an illegal act such as playing a recorded program or playing a time difference and answering the quiz and sending the result to the broadcaster.

  Thirdly, when playing a program that records a data broadcast that transmits viewer data to a broadcaster or performing time-lag playback, the viewer data can be transmitted to the broadcast station even after the program ends. For this reason, when a program recorded by digital broadcasting is played back or time difference playback is performed, viewer data is transmitted to the broadcaster at a date and time not intended by the broadcaster.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and viewer data is lost even if a digital data broadcast is recorded and then repeatedly reproduced or time-sequentially reproduced. There is provided a digital broadcast receiver in which unauthorized viewer data is not transmitted to the broadcaster, and viewer data is not transmitted to the broadcaster at a date and time not intended by the broadcaster. For the purpose.

  In order to achieve the above object, the present invention provides a digital broadcast receiver, a reception control unit for determining whether a broadcast radio wave reception state, a recorded program playback state, or a time difference playback state, and viewer data When the state notified from the reception control unit and the state notified from the reception control unit is a broadcast radio wave reception state, the viewing held in the first viewer data holding region When the state notified from the reception control unit is either the recorded program playback state or the time difference playback state, the viewer data stored in the second viewer data storage area is referenced. And a data broadcast analyzing unit. Here, the viewer data refers to data related to the viewer of the digital data broadcast, such as the viewer's name, address, telephone number, and game points acquired by the viewer.

  According to the present invention, since the reference destination of the viewer data is changed between the broadcast radio wave reception state and the recorded program playback state or the time difference playback state, even if playback is performed repeatedly or time difference playback is performed, Person data is not lost, and fraudulent acts such as rough earning of points due to repeated reproduction can also be prevented.

  In the digital broadcast receiver, the recorded data in the digital broadcast and the viewer data held in the first viewer data holding area can be stored in the recorded data storage unit together with the reception control. If the state notified from the recording unit is the recorded program playback state, the data broadcast analysis unit does not refer to the viewer data held in the first viewer data holding area, and the recorded data The viewer data stored together with the recording data in the storage unit can be held in the second viewer data holding area, and the second viewer data holding area can be referred to.

  In addition, when the reproduction of the recorded data is completed, the data broadcast analysis unit may delete the viewer data held in the second viewer data holding area.

  Further, when the state notified from the reception control unit is the time difference reproduction state, the data broadcast analysis unit does not refer to the viewer data held in the first viewer data holding area. The viewer data stored together with the recording data in the recording data storage unit can be held in the second viewer data holding area, and the second viewer data holding area can be referred to. .

  In the digital broadcast receiver, when the state notified from the reception control unit is a recorded program playback state, the data broadcast analysis unit may block the communication function of the digital broadcast receiver. . In addition, when the state notified from the reception control unit is a time difference reproduction state, the data broadcast analysis unit may block the communication function of the digital broadcast receiver. As a result, it is possible to prevent unauthorized viewer data from being transmitted to the broadcaster, and to prevent viewer data from being transmitted to the broadcaster at a date and time not intended by the broadcaster. it can.

  When the state notified from the reception control unit transits from the recorded program reproduction state to the broadcast radio wave reception state, the data broadcast analysis unit may restore the communication function of the digital broadcast receiver. In addition, when the state notified from the reception control unit transits from the time difference reproduction state to the broadcast radio wave reception state, the data broadcast analysis unit may restore the communication function of the digital broadcast receiver. .

  When the state notified from the reception control unit is a recorded program playback state, the data broadcast analysis unit does not change the viewer data stored together with the recording data in the recording data storage unit. Can do. As a result, even when a recorded program is played back, the viewer can reproduce the recorded state as when receiving broadcast radio waves, and playback starts from the same state every time a recorded program is played back. Can do.

  As described above, according to the digital broadcast receiver of the present invention, even if digital data broadcast is recorded and repeatedly played back later or time-lag playback is performed, viewer data is not lost, and illegal viewing is performed. Broadcaster data is not transmitted to the broadcaster, and viewer data is not transmitted to the broadcaster at a date and time not intended by the broadcaster.

  FIG. 1 shows an embodiment of a digital broadcast receiver according to the present invention. This digital broadcast receiver is a PC (personal computer) on which a dedicated reception board 1 is mounted, and broadcasts received from the reception board 1. The data is processed by the reception control unit 2 and the data broadcast analysis unit 3 and then presented to the viewer on the video (data broadcast) display unit 7. Note that data that does not require processing in the data broadcast analysis unit 3 is sent directly from the reception control unit 2 to the video (data broadcast) display unit 7.

  The video (data broadcast) display unit 7 has a function for presenting data processed by the reception control unit 2 and, if necessary, the data broadcast analysis unit 3 to the viewer, and is usually a PC display or TV screen. Etc.

  The communication unit 8 is an apparatus for transmitting viewer data using a telephone line, an Internet line, etc. when the data broadcast analyzing unit 3 determines that it is necessary to transmit viewer data to a broadcasting station. It is.

  The recorded data accumulation unit 6 has a function of accumulating data recorded by the viewer and can store a plurality of recorded data.

  The viewer data holding area A4 is an area for storing viewer data in a program presented to the viewer. In digital broadcasting, NVRAM, GREG, and UREG correspond to this, and must be held by the receiver. Reading and writing to this area is performed in response to a request from the data broadcast analysis unit 3.

  The viewer data holding area B5 is a characteristic part of the present invention, and is referenced instead of the viewer data holding area A4 in order to protect the viewer data holding area A4 when playing a recorded program or when performing time difference playback. It is an area to be done.

  The viewer data holding area A4 and the viewer data holding area B5 are encrypted to prevent unauthorized use of data. When operating on a PC receiver, falsification and leakage of data is prevented by providing the following functions.

(1) Function of detecting whether the last update date / time of the viewer data holding area A4 and the viewer data holding area B5 has been changed (2) Data in the viewer data holding area A4 and the viewer data holding area B5 are transferred to another PC A function that can be used only by the recording PC so that it cannot be used by the receiver. (3) A program for accessing the viewer data holding area A4 and the viewer data holding area B5 is reverse-engineered. (4) Function for preventing the program execution operation from being tracked when accessing the viewer data holding area A4 and the viewer data holding area B5.

  When the above function is provided on the PC system and data tampering is detected, the data stored in the viewer data holding area A4 is reset without reading from the viewer data holding area A4. Therefore, there is an effect of preventing illegal use of viewer data and data leakage.

  FIG. 2 shows the structure of data held by one recorded program in the digital broadcast receiver according to the present invention. Here, recording was performed together with a storage area for broadcast data (in BS digital broadcast, broadband CS digital broadcast, terrestrial digital television broadcast, and terrestrial digital radio broadcast, corresponding to video, audio, data, subtitles, character super, etc.) The program information and the state of viewer data (NVRAM, GREG, UREG, etc.) at the start of recording are stored in the recorded data storage unit 6. Then, at the time of recording / playback, the viewer data stored in the recorded data storage unit 6 is accessed, and the state at the time of recording can be reproduced without the viewer being aware of it.

  Further, since the viewer data is stored in the recorded data storage unit 6 when the recorded program is played back, tampering and data cannot be extracted. Therefore, data must be protected from unauthorized users. Therefore, data is prevented from being tampered or leaked by encrypting this area.

  Next, the flow of processing at the start of program recording will be described with reference to FIG.

  When a recording start request is made in accordance with the viewer's instruction (including the one scheduled to be recorded by the viewer) (step A1), it is stored in the recorded program information and viewer data holding area A4 when the recording is started. Is stored in the recorded data storage unit 6 (steps A2 and A3). At this time, if there is a data area that cannot be accessed from the program to be recorded, the storage capacity can be reduced by storing only necessary data without storing it.

  By performing this storage process, it is possible to reconstruct the recording environment when the recorded program is reproduced. When the recording program information and the viewer data are stored, the program content is stored (step A4), and the stored data is encrypted at the end of recording (step A5).

  FIG. 4 is a functional block diagram of the digital broadcast receiver according to the present invention during playback of a recorded program. At the start of playback of the recorded program, the data broadcast analysis unit 3 decodes the viewer data stored in the recorded data storage unit 6 and stores it in the viewer data holding area B5. Broadcast data stored in the recorded data storage unit 6 is sent to the receiving board 1. While the broadcast data is being sent to the receiving board 1 (while the recorded program is being played back), the viewer data stored in the viewer data holding area A4 is not accessed. That is, when an access request from the data content to the viewer data occurs during the reproduction of the recorded program, the data broadcast analysis unit 3 performs only the data stored in the viewer data holding area B5.

  Thus, it is possible to hold the state of the holding area A4 for the viewer data that is referred to in the normal reception state (the state in which broadcast radio waves are received) during playback of the recorded program. Further, even when a power failure or the like occurs, it is possible to protect the data stored in the viewer data holding area A4. At this time, the communication unit 8 is blocked by the data broadcast analysis unit 3 so as not to transmit illegal data to the broadcast station. Even if the data broadcast analysis unit 3 receives a communication request, the data broadcast analysis unit 3 does not actually make a request to the communication unit 8, and the data broadcast analysis unit 3 performs processing as an error so that the communication unit 8 is blocked.

  FIG. 5 shows the flow of processing during playback of the recorded program. When the reproduction of the recorded data is started according to the instruction of the viewer (step B1), the data broadcast analysis unit 3 decodes the viewer data stored at the time of recording (step B2), and the viewer data holding area B5 (Step B3). As shown in step A5 of FIG. 3, since these data are encrypted when performing the recording process, they are encrypted when presented to the viewer using the video (data broadcast) display unit. It is necessary to decode the broadcast data.

  During playback of the recorded program, the data broadcast analyzing unit 3 controls the restored viewer data to access the original viewer data (refers to data stored in the viewer data holding area A4). Is not accessed at all (step B4).

  Thus, the viewer environment at the start of program recording is reproduced. At the same time, the data change at the time of recording reproduction and time difference reproduction is controlled by the data broadcast analysis unit 3 only for the viewer data holding area B5, and is therefore reflected in the viewer data holding area A4. There is no.

  In addition, as a measure for preventing transmission of data at an unintended timing on the broadcast content or broadcast station side where duplicate transmission is prohibited, the data broadcast analysis unit 3 performs the reproduction of a recorded program. Then, the communication unit 8 is blocked so that data cannot be transmitted to the broadcasting station (step B5). Even if the data broadcast analysis unit 3 receives a communication request, the data broadcast analysis unit 3 does not actually make a request to the communication unit 8, and the data broadcast analysis unit 3 performs processing as an error so that the communication unit 8 is blocked.

FIG. 6 is a flowchart showing the operation at the end of playback of the recorded program. When the reproduction of the recorded program is finished by the operation of the viewer (step C1), the data broadcast analysis unit 3 discards the viewer data stored in the viewer data holding area B5 (step C2). The subsequent viewer data reference is made from the viewer data holding area A4 (step C3). At the same time, the data broadcast analysis unit 3 returns to the normal state (a state in which a broadcast radio wave is received and viewed) by enabling the communication function 8 that has been disabled (step C4), (step C5), Returning to the configuration of FIG. When the data broadcast analysis unit 3 receives a communication request, the data broadcast analysis unit 3 makes a communication request to the communication unit 8 so that the blocked communication function can be restored.

  FIG. 7 is a functional block diagram of the digital broadcast receiver according to the present invention at the time difference reproduction. At the start of time difference reproduction, the viewer data stored in the viewer data holding area A4 is copied to the viewer data holding area B5. The data broadcast analysis unit 3 does not access the viewer data stored in the viewer data holding area A4 until the time difference reproduction ends. During the time difference reproduction, the data broadcast analysis unit 3 makes an access request from the data content only for the viewer data holding area B5.

  This makes it possible to hold the state of the viewer data stored in the viewer data holding area A4 during the time difference playback. Further, even when a power failure or the like occurs, it is possible to protect the viewer data stored in the viewer data holding area A4. At this time, the communication unit 8 is blocked by the data broadcast analysis unit 3 so that unauthorized data is not transmitted to the broadcast station. Even if the data broadcast analysis unit 3 receives a communication request, the data broadcast analysis unit 3 does not actually make a request to the communication unit 8, and the data broadcast analysis unit 3 performs processing as an error so that the communication unit 8 is blocked.

  FIG. 8 shows a flowchart of processing at the start of time difference reproduction. When the time difference reproduction is started by the viewer's instruction (or automatic processing such as reservation) (step D1), the data broadcast analysis unit 3 converts the data stored in the viewer data holding area A4 to the viewer Copy to the data holding area B5 (step D2). Thereafter, during time difference reproduction, the data broadcast analysis unit 3 performs only the viewer data holding area B5 when referring to the viewer data (step D3).

  As a result, the viewer data is tampered with (such as using the rewind function of the time difference playback function to obtain points when the quiz is answered correctly, confirming the correct answer, answering the quiz, and earning points, etc.) Can be prevented. As with the recorded program playback, the data broadcast analysis unit 3 blocks communication with the broadcast station (step D4) and prevents transmission of unauthorized data to the broadcast station. Even if the data broadcast analysis unit 3 receives a communication request, the data broadcast analysis unit 3 does not actually make a request to the communication unit 8, and the data broadcast analysis unit 3 performs processing as an error so that the communication unit 8 is blocked.

  FIG. 9 shows a flowchart of processing at the end of time difference reproduction. When the time difference reproduction is completed by the instruction of the viewer (or automatic processing such as reservation) (step E1), the viewer data stored in the viewer data holding area B5 is discarded (step E2), and the data broadcast analysis unit 3, the viewer data reference destination is returned from the viewer data holding area B5 to the viewer data holding area A4 (step E3). The data broadcast analysis unit 3 restores the communication function of the communication unit 8 that was interrupted at the start of time difference reproduction (step E4), enters the broadcast radio wave reception state, and returns to the configuration of FIG. 1 (steps E4 and E5). When the data broadcast analysis unit 3 receives a communication request, if the communication request is actually made to the communication unit 8, the blocked communication function can be restored.

  With the above configuration, the viewer data can be safely maintained and protected from unauthorized operation in any case (regardless of the normal state, the recorded program playback, the time difference playback, etc.) In addition to complying with essential requirements, it is possible to satisfy not only the requirements but also the demands of users who want to view data broadcasting contents at any time.

  In the above embodiment, a case where two viewer data holding areas are provided has been described. However, three or more viewer data holding areas may be provided, and if it is a digital broadcast receiver, The present invention can be applied even if it is not installed on a PC.

It is a functional block diagram which shows one Embodiment of the digital broadcast receiver concerning this invention. It is a data structure (in the case of broadband CS digital broadcasting) when one program is recorded with the digital broadcast receiver according to the present invention. It is a flowchart which shows the operation | movement at the time of the video recording start of the digital broadcast receiver concerning this invention. It is a functional block diagram at the time of a recorded program reproduction start of the digital broadcast receiver concerning this invention. It is a flowchart which shows the operation | movement at the time of the recorded program reproduction | regeneration of the digital broadcast receiver concerning this invention. It is a flowchart which shows the operation | movement at the time of completion | finish of recorded program reproduction | regeneration of the digital broadcast receiver concerning this invention. It is a functional block diagram of the operation | movement at the time of the time difference reproduction start of the digital broadcast receiver concerning this invention. It is a flowchart which shows the operation | movement at the time difference reproduction | regeneration of the digital broadcast receiver concerning this invention. It is a flowchart which shows the operation | movement at the time of the time difference reproduction | regeneration completion | finish of the digital broadcast receiver concerning this invention.

Explanation of symbols

1 Reception Board 2 Reception Control Unit 3 Data Broadcast Analysis Unit 4 Viewer Data Holding Area A
5 Viewer data holding area B
6 Recording Data Storage Unit 7 Video (Data Broadcast) Display Unit 8 Communication Unit

Claims (10)

A reception control unit that determines whether the broadcast radio wave reception state, the recorded program playback state, or the time difference playback state is present;
First and second viewer data holding areas for holding viewer data;
When the state notified from the reception control unit is a broadcast radio wave reception state, the viewer data held in the first viewer data holding area is referred to, and the state notified from the reception control unit is A digital broadcast reception comprising: a data broadcast analysis unit that refers to viewer data held in the second viewer data holding area in either a recorded program playback state or a time difference playback state Machine.   2. The digital broadcast receiver according to claim 1, wherein the recorded data in the digital broadcast and the viewer data held in the first viewer data holding area are also stored in the recorded data storage unit.   If the state notified from the reception control unit is a recorded program playback state, the data broadcast analysis unit, without referring to the viewer data held in the first viewer data holding area, 3. The viewer data stored together with the recording data in the recording data storage unit is held in the second viewer data holding area, and the second viewer data holding area is referred to. The digital broadcast receiver described.   4. The digital broadcast receiver according to claim 3, wherein when the reproduction of the recorded data is finished, the data broadcast analysis unit deletes the viewer data held in the second viewer data holding area. .   When the state notified from the reception control unit is the time difference reproduction state, the data broadcast analysis unit does not refer to the viewer data held in the first viewer data holding area, and 3. The viewer data stored together with the recording data in the recording data storage unit is held in the second viewer data holding area, and the second viewer data holding area is referred to. Digital broadcast receiver.   6. The data broadcast analysis unit cuts off a communication function of the digital broadcast receiver when the state notified from the reception control unit is a recorded program playback state. A digital broadcast receiver according to any one of the above.   6. The data broadcast analysis unit cuts off a communication function of the digital broadcast receiver when the state notified from the reception control unit is a time difference reproduction state. The digital broadcast receiver described in 1.   The data broadcast analysis unit restores the communication function of the digital broadcast receiver when the state notified from the reception control unit transitions from a recorded program playback state to a broadcast radio wave reception state. Item 7. A digital broadcast receiver according to Item 6.   The data broadcast analysis unit restores the communication function of the digital broadcast receiver when the state notified from the reception control unit transitions from the time difference reproduction state to the broadcast radio wave reception state. 7. The digital broadcast receiver according to 7.   When the state notified from the reception control unit is a recorded program playback state, the data broadcast analysis unit does not change the viewer data stored together with the recording data in the recording data storage unit. The digital broadcast receiver according to claim 3.

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