JP2010021980A - Data broadcast system, data broadcast method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data broadcast system extending a period until an NVRAM (nonvolatile memory) of a receiver reaches the end of its life; and a data broadcast method. <P>SOLUTION: A broadcast station broadcasts data broadcasting including program information comprising an information message such as an image, an NVRAM storage module and an event message. A receiver includes a dispersive storage means to store the reception record of the event message by dispersing it into a plurality of blocks of a nonvolatile memory of the receiver based on the NVRAM storage module. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data broadcasting system, a data broadcasting method, and a program.

  In recent years, digital broadcasting, which replaces analog broadcasting and broadcasts program information composed of information such as video, audio, and text in a digital format, is rapidly being developed. One of the features of digital broadcasting is that it can provide various services using data broadcasting as well as improving the image quality of video and audio. For example, a point system according to viewing time is one of services, and a technique for realizing this service is described in Patent Document 1.

  The technology described in Patent Document 1 broadcasts a content (module) for measuring viewing time from a digital broadcasting station, measures the viewing time of a program by the receiving means of the viewer using the content, and responds to the measured time. Provide service to the viewer. The viewing time is measured by converting the viewing time into points and providing a service corresponding to the number of points to the viewer.

Here, the viewing time is measured by accumulating the viewing time using an event message transmitted from the digital broadcasting station. For storing the event message and the points, an area dedicated to the operator in the NVRAM (nonvolatile memory) of the digital broadcast receiver is used.
JP 2001-320341 A

  By the way, although it is NVRAM (nonvolatile memory) which accumulate | stores the reception recording of an event message and accumulate | stores a point, it has a lifetime with respect to information rewriting, The lifetime is several tens of thousands to several million times.

  On the other hand, television receivers are generally used for many years, and NVRAM (nonvolatile memory) mounted on television receivers should be rewritten up to tens of thousands of times. From this point of view, it is necessary to rewrite NVRAM (nonvolatile memory) to about 3 times a day for the same block (area).

  However, the viewing time measurement and point service technology described in Patent Document 1 described above cannot be realized by rewriting about three times a day.

  Therefore, the present invention has been invented in view of the above problems, and an object thereof is to provide a data broadcasting system and a data broadcasting method for extending the period until the life of the NVRAM (nonvolatile memory) of the receiver. It is in.

  The present invention that achieves the above object is a data broadcasting system, characterized in that it has distributed storage means for distributing and storing information recorded by data broadcasting in a plurality of blocks of a nonvolatile memory of a receiver. .

  The present invention that achieves the above object is a data broadcasting method, characterized in that recording of information by data broadcasting is distributed and stored in a plurality of blocks of a nonvolatile memory of a receiver.

  The present invention that achieves the above object is a data broadcast program, which causes a receiver to execute processing for distributing and storing information recording by data broadcast in a plurality of blocks of a nonvolatile memory of the receiver. Features.

  In the present invention, since the recording of information by data broadcasting is distributed and stored in a plurality of blocks of the non-volatile memory (non-volatile memory) of the receiver, the life of the NVRAM (non-volatile memory) of the receiver is reached. The period can be extended.

  A first embodiment of the present invention will be described.

  FIG. 1 is a block diagram of the embodiment. In the following description, a point service based on event message reception records will be described as an example.

  A digital broadcast system according to an embodiment of the present invention includes a broadcast station 1 that broadcasts data broadcast including program information including information such as video, audio, and text, an NVRAM storage module, and an event message, and a digital broadcast station And a television receiver 2 that receives and views digital information from 1 and points the viewing time of the program.

  The broadcasting station 1 includes an event message sending unit 11 that sends an event message, and an NVRAM storage module sending unit 12 that sends an NVRAM storage module.

  Here, the event message sent from the event message sending unit 11 describes the version information (message version) of the event message, and the private data contains the program name and ID.

  The NVRAM storage module sent from the NVRAM storage module sending unit 12 is a program for distributing the event message reception records to the NVRAM of the television receiver 2 and for collecting points based on the event message reception records. .

The television receiver 2 includes a block 20 ₁ of NVRAM (non-volatile memory) and 20 _N, a reception unit 21, a distributed storage unit 22, a counting unit 23, an output unit 24.

  The receiving unit 21 receives video, audio, and data broadcasts from the broadcast station 1.

Distributed storage unit 22, based on the NVRAM storage module of the data broadcast, to distribute the received event message is recorded from the block 20 ₁ of the NVRAM 20 _N. The operation of the distributed storage unit 22 will be described later.

Counting unit 23 based on the received recording recorded from the block 20 ₁ of the NVRAM 20 _N, do the aggregation point. The operation of the counting unit 23 will be described later.

  The output unit 24 is a display.

  Next, the operation in the present embodiment will be described using a specific example.

First, a description will be given from the block 20 ₁ of NVRAM 20 _N. The NVRAM of the receiver is assigned in advance to each broadcasting station for each block. In the present embodiment, in the block 20 ₁ of the NVRAM 20 _N, shall be used as a block allocated to the broadcasting station 1, up to block ₁₆ to block ₄₅ of the.

FIG. 2 is a diagram showing a description structure of each block of the NVRAM. As shown in FIG. 2, each block ₁₆ through block ₄₅ of NVRAM, a field of the program name, and a field of view points (the reception of the event message), and the field of the latest ID (a) of the event message, the update date field And have. In the program name field, the name of the program that uses the block is recorded. The field in which the viewing points are stored is further divided every week. In the example of FIG. 2, four weeks of fields are provided. In the weekly field, the number of event message receptions is recorded. Note that the viewing point becomes 1 point when receiving an event message once.

  Next, an operation in which the distributed storage unit 22 distributes and records reception of event messages (viewing points) in the NVRAM block having the description structure described above will be described. FIG. 3 is an operation flowchart of the distributed storage unit 22. In the following description, the program name providing the viewing point is “mayobura”.

  First, data broadcasting is received (Step 100), and reception of an event message is monitored (Step 101).

  When reception of an event message is detected (Step 102), a difference between TDT (Time Date Table) and TOT (Time Offset Table) is obtained (Step 103). If the difference is smaller than 10 seconds, an event message by recording is obtained. Is not received, and the process proceeds to the next step. On the other hand, when the difference exceeds 10 seconds, it is determined that the event message is received by recording, and the process returns to Step 101.

  If it is determined that the event message is not received by recording, the version (= N) of the received event message is acquired, and the version (= N) is set as the block number (= b) of NVRAM (Step 104). Then, the block b of NVRAM is referred to (Step 105).

  It is determined whether the referenced NVRAM block b is used by a corresponding program (a program providing a point service, in this embodiment, a program name “mayobura”) (Step 106).

  When the referred block b of NVRAM is used by the corresponding program (program name “mayobura”), the event message reception date is acquired from the TOT (Step 107).

  Next, it is determined whether the reception date of the received event message is the same as the date described in the update date field of block b (Step 108). If they are the same, the ID (= a) of the event message is compared with the final ID of the final ID field of the block b (Step 109).

  If the ID (= a) of the event message is larger than the final ID of the final ID field of block b, the point storage position in the viewing point field of block b is determined by the broadcast date (Step 110). On the other hand, when the ID (= a) of the event message is smaller than the final ID of the block b, the process returns to Step 101.

  When the point storage position is determined, the point (event message reception count) of the storage position is incremented by 1, the event message ID (= a) is stored in the last ID field of the same record, and the update date field Stores the event message reception date. If the program name field is not stored (not filled in), “mayobura” is stored in the program name (Step 111).

  Next, the operation of the counting unit 23 will be described. FIG. 4 is an operation flowchart of the counting unit 23.

First, when receiving the data broadcast and requesting the execution of the point display (Step 200), the totaling unit 23 uses blocks ₁₆ to ₄₅ among the NVRAM blocks allocated to the broadcasting station 1. Assuming that N is 16 (Step 201). Then, the block _N of the NVRAM is referred to (Step 202).

When “mayobura” is stored in the program name field of the block _N of the NVRAM (Step 203), it is described in the point storage position of the X (1 to 4) th week described in the block _N of the referenced NVRAM. C [x] is referred to (Step 204). Then, c [x] is added to the x week total point (= dx) (Step 205). When the process is completed, 1 is added to N (Step 206).

On the other hand, if “mayobura” is not stored in the program name field of the block _N of NVRAM, the process proceeds to Step 206.

  When N is larger than 45 (Step 207), the total points d1, d2, d3, d4 of each week are summed, and the total point (d_all) from the first to the fourth week is calculated (d_all = d1 + d2 + d3 + d4) (Step 208) ). Then, the calculated total point (d_all) is displayed (Step 209). On the other hand, when N is 45 or less (Step 207), the process returns to Step 202.

  The distributed storage unit 22 and the totaling unit 23 operating as described above can be realized by hardware, but in the case of data broadcasting, as described above, it can be realized by the NVRAM storage module. An example of the NVRAM storage module is shown in FIGS.

  As described above, according to the present embodiment, reception records of event messages in data broadcasting are distributed and stored in a plurality of blocks of the nonvolatile memory of the receiver, so that the NVRAM (nonvolatile memory) of the receiver is stored. The period until the end of the service life can be extended.

  Next, a second embodiment will be described.

  In data broadcasting, not only the point service based on the reception record of the event message described in the first embodiment but also the user's viewing preference can be investigated by the reception record of the event message. Therefore, the second embodiment is an example in which the writing of the reception record of the event message for each broadcast time zone is applied to the present invention.

  FIG. 11 is a diagram showing a description structure of each block of the NVRAM. As shown in FIG. 11, a header field is formed of a block write count field, an event name (program name) field, an update date / time field, and an expiration date field. The main data field includes a field for the number of times of viewing in the morning, a field of the number of times of viewing in the day, a field of the number of times of viewing in the night, and a field of the number of times of viewing in the midnight. In addition, the numerical value of the parenthesis of each field has shown the information amount (byte) of each field.

  In addition, the event message sent from the event message sending unit 11 includes at least the event name of the event message and the expiration date of this event. The expiration date may be described in a program on the data broadcasting side.

  Next, an operation in which the distributed storage unit 22 records and records event message reception records in an NVRAM block having the above-described description structure in a distributed manner will be described. FIG. 12 is an operation flowchart of the distributed storage unit 22. In the following description, the event name is “a” and the number of writable blocks is “b” (20 in this embodiment). The morning time is 6:00 to 11:59, the daytime is 12:00 to 17:59, the night is 18:00 to 23:59, The midnight time is from 0:00 to 5:59.

  First, reception of data broadcasting is started (Step 300), and reception of an event message is monitored (Step 301).

  When the event message is received (Step 302), the current time is acquired from the TOT (Step 303). Also, the event name “a” and the writable block number “b” in the event message are acquired (Step 304). Subsequently, each block of the NVRAM is referred to, and the number “c” of blocks having the event name “a” and the update date / time “d” are obtained (Step 305). Then, the acquired current time is compared with the update date / time of the update date / time field of the block whose acquired event name is “a”, and the same time and the same time zone (morning, daytime, nighttime) as the acquired TOT. , Midnight) is determined whether or not there is an update date and time “d” (Step 306). If it exists, it is an event message received once in the same time zone on the same day, and there is no need to record it, so the process returns to Step 301.

  On the other hand, if there is no update date and time on the same day as the acquired current time, it is determined whether the number of blocks “c” whose event name is “a” is equal to “b” (Step 307). If equal, all the blocks are used in the reception record of the event message whose event name is “a”. Therefore, referring to the block write count field, the block with the smallest write count is selected from the blocks having the event name “a” (Step 308). If the number of times of writing is the same, a block with a young address is selected.

  Then, the number of times of writing in the selected block is incremented by 1, the event name “a” is written in the event name field, the acquired current time is written in the update date / time field, and the expiration date is written in the expiration date field. In addition, the number of times in the corresponding time zone (morning, daytime, nighttime, or midnight) is incremented by 1 from the TOT acquired when the event message is received (Step 309).

  On the other hand, if the number of blocks “c” with the event name “a” is not equal to “b”, there is a block that is not used in the event “a”, so the initial value of n is set to 1 (Step 310). The address with the nth smallest write count is searched (Step 311). When the number of writings is the same, the addresses are in order. If the event name of the block at the corresponding address is “a”, or if it is outside the expiration date (Step 312), the process proceeds to step 309. If the event name of the block at the corresponding address is “a” or is not out of the validity period, n is incremented by 1 (Step 313), and the process proceeds to step 311.

  In this way, event message reception records are distributed and stored in a plurality of blocks of the receiver's nonvolatile memory (nonvolatile memory), so that the life of the receiver's NVRAM (nonvolatile memory) is reached. The period can be extended.

  Next, the operation of the counting unit 23 will be described. FIG. 13 is an operation flowchart of the counting unit 23.

  First, the totaling unit 23 receives a data broadcast, and when execution of totalization of reception records is requested (Step 400), refers to each block of NVRAM and acquires the address of the block whose event name is “a” ( Step 401).

  Next, “the total number of viewing times in the morning band e1”, “the total number of viewing times in the daytime e2”, “the total number of viewing times in the night band e3”, “the number of viewing times in the midnight band” Is obtained (step 402).

  It is possible to obtain an individual viewing style from the acquired e1, e2, e3, e4 and use it for displaying a data broadcast corresponding to the viewing style.

  Next, a third embodiment will be described.

  The third embodiment is an example in which the writing of reception records of event messages by genre is applied to the present invention.

  FIG. 14 is a diagram showing a description structure of each block of the NVRAM. As shown in FIG. 14, a header portion field including a block write count field, an event name field, an update date / time field, and an expiration date field is provided. The main data field includes a genre field, a program name field, a program broadcast count field, and a viewing count field. In addition, the numerical value of the parenthesis of each field has shown the information amount (byte) of each field.

  In addition, the event message sent from the event message sending unit 11 includes at least the event name of the event message and the expiration date of this event.

  Next, an operation in which the distributed storage unit 22 records and records event message reception records in an NVRAM block having the above-described description structure in a distributed manner will be described. FIG. 15 is an operation flowchart of the distributed storage unit 22. In the following description, the event name is “a”, the program genre is “b”, the program name is “c”, and the number of broadcasts is “d”.

  First, reception of data broadcasting is started (Step 500), and reception of an event message is monitored (Step 501).

  When the event message is received (Step 502), the current time is acquired from the TOT (Step 503). Subsequently, the event name “a”, the writable block count “b”, the program name “C”, and the broadcast count “d” in the event message are acquired (Step 504).

  Each block of NVRAM is referred to (Step 505), and it is determined whether there is a block whose program name is “c” and the number of broadcasts is “d” (Step 506). If there is a block whose program name is “c” and the number of broadcasts is “d”, it is an already recorded event message and does not need to be recorded, so the process returns to Step 501.

  If there is no block having the program name “c” and the number of broadcasts “d”, it is determined whether the event name is “a” and the program genre is “b”. (Step 507). If it exists, the number of times of writing in the corresponding block is incremented by 1, the event name “a” is written in the event name field, the acquired TOT time is written in the update date / time field, and the expiration date is written in the expiration date field. Write. Further, the program genre is set to “b”, the program name is set to “c”, the broadcast count is written to “d”, and the viewing count is incremented by +1 (Step 508).

  On the other hand, when the event name is “a” and the program genre is “b” does not exist, the initial value of n is set to 1 (Step 509), and an address with the nth smallest write count is searched (Step 510). ). If the number of writes is the same, the order is the address. If the event name of the block at the corresponding address is not “a” and the expiration date is outside the valid period (Step 511), the process proceeds to step 508. If the event name of the block at the corresponding address is “a”, or if it is not out of the validity period, n is incremented by +1 and the process proceeds to step 510.

  In this way, event message reception records are distributed and stored in a plurality of blocks of the receiver's nonvolatile memory (nonvolatile memory), so that the life of the receiver's NVRAM (nonvolatile memory) is reached. The period can be extended.

  Next, the operation of the counting unit 23 will be described. FIG. 16 is an operation flowchart of the counting unit 23.

  First, when receiving the data broadcast and requesting the execution of the point aggregation (Step 600), the aggregation unit 23 refers to each block of the NVRAM and acquires the address of the block whose event name is “a” (Step 601). .

  Next, the genre d and the number of viewing times of the corresponding address in the block of all acquired addresses are acquired (Step 602).

  A personal viewing style is obtained from the acquired number of viewings for each genre, and is used for displaying data broadcasting in accordance with the viewing style.

  Next, a fourth embodiment will be described.

  In the above-described embodiment, an example in which event message reception records are distributed and stored in the nonvolatile memory of the receiver has been described. However, what is stored in a non-volatile memory of the receiver is not limited to event message reception records. Therefore, in the fourth embodiment, an example will be described in which predetermined information is distributed and stored in the nonvolatile memory of the receiver by a program provided by data broadcasting. In the following description, BML will be described as an example of a program. The recording of information by the program will be described by taking a viewing history every predetermined time as an example.

  FIG. 17 is a diagram showing a description structure of each block of the NVRAM. As shown in FIG. 17, a header field includes a block write count field, an event name (program name) field, an update date / time field, and an expiration date field. The main data field includes a field for the number of times of viewing in the morning, a field of the number of times of viewing in the day, a field of the number of times of viewing in the night, and a field of the number of times of viewing in the midnight. In addition, the numerical value of the parenthesis of each field has shown the information amount (byte) of each field.

  On the other hand, the BML of the data broadcast to be broadcast describes the event name, the number of blocks used for recording the viewing history, and the expiration date of the event. Then, while receiving the data broadcast without changing the channel, a process is performed in which the viewing history is distributed and recorded in the NVRAM every predetermined time (for example, 1 minute).

  Next, an operation in which the distributed storage unit 22 records the viewing history in the NVRAM in a distributed manner in the NVRAM block having the description structure described above will be described. FIG. 18 is an operation flowchart of the distributed storage unit 22. In the following description, it is assumed that the event name is “a” and the number of blocks used in the event is “b” (20 in this embodiment). The morning time is 6:00 to 11:59, the daytime is 12:00 to 17:59, the night is 18:00 to 23:59, The midnight time is from 0:00 to 5:59.

  First, reception of the data broadcast is started (Step 700), and processing for recording the viewing history in NVRAM is performed every predetermined time (1 minute in this example) (Step 701).

  First, the current time is acquired from the TOT (Step 702). Subsequently, each block of the NVRAM is referred to, and the number “c” of each block (address) whose event name is “a” and its update date “d” are obtained (Step 703). Then, the acquired current time is compared with the update date / time in the update date / time field of the block whose event name is “a”, and the same time and the same time zone (morning, daytime, night) as the acquired current time. It is determined whether or not there is an update date / time “d” (step 704). If it exists, the viewing history is recorded once in the same time zone on the same day and does not need to be recorded, so the process returns to Step 701.

  On the other hand, if there is no update date and time on the same day as the acquired current time, it is determined whether the number of blocks “c” with the event name “a” is equal to “b” (Step 705). If equal, all the blocks are used in the recording of the viewing history having the event name “a”. Therefore, referring to the block write count field, the block with the smallest write count is selected from the blocks having the event name “a” (Step 706). If the number of times of writing is the same, a block with a young address is selected.

  Then, the number of times of writing in the selected block is incremented by 1, the event name “a” is written in the event name field, the acquired current time is written in the update date / time field, and the expiration date is written in the expiration date field. In addition, the number of times in the field corresponding to the acquired current time (any of morning, daytime, nighttime, and midnight) is incremented by +1 (Step 707).

  On the other hand, if the number of blocks “c” with the event name “a” is not equal to “b”, there is a block that is not used in the event “a”, so the initial value of n is set to 1 (Step 708). The address with the nth smallest write count is searched (Step 709). When the number of writings is the same, the addresses are in order. If the event name of the block at the corresponding address is “a”, or if it is out of the validity period (Step 710), the process proceeds to step 308. If the event name of the block at the corresponding address is “a” or is not out of the validity period, n is incremented by 1 (Step 711), and the process proceeds to step 709.

  In this way, since viewing history records are distributed and stored in a plurality of blocks of the non-volatile memory (non-volatile memory) of the receiver, the period until the end of the NVRAM (non-volatile memory) of the receiver Can be extended.

  Next, the operation of the counting unit 23 will be described. FIG. 19 is an operation flowchart of the counting unit 23.

  First, when receiving a data broadcast and requesting the execution of reception record aggregation (Step 800), the aggregating unit 23 refers to each block of the NVRAM and acquires the address of the block whose event name is “a” ( Step 801).

  Next, “the total number of viewing times in the morning band e1”, “the total number of viewing times in the daytime e2”, “the total number of viewing times in the night band e3”, “the number of viewing times in the midnight band” Is obtained (step 802).

  It is possible to obtain an individual viewing style from the acquired e1, e2, e3, e4 and use it for displaying a data broadcast corresponding to the viewing style.

  Next, a fifth embodiment will be described.

  The fifth embodiment is a modification of the above-described fourth embodiment, and is an example in which the writing of a viewing history record for each genre is applied to the present invention. In the following description, BML will be described as an example of a program.

  FIG. 20 shows the description structure of each block of NVRAM. As shown in FIG. 20, a field of a header part composed of a block write count field, an event name field, an update date / time field, and an expiration date field is provided. The main data field includes a genre field, a program name field, a program broadcast count field, and a viewing count field. In addition, the numerical value of the parenthesis of each field has shown the information amount (byte) of each field.

  On the other hand, the BML of a data broadcast to be broadcast describes an event name, an expiration date of the event, a program genre, a program name, and the number of broadcasts. Then, while receiving the data broadcast without changing the channel, a process is performed in which the viewing history is distributed and recorded in the NVRAM every predetermined time (for example, 1 minute).

  Next, an operation in which the distributed storage unit 22 records and records event message reception records in an NVRAM block having the above-described description structure in a distributed manner will be described. FIG. 21 is an operation flowchart of the distributed storage unit 22. In the following description, the event name is “a”, the program genre is “b”, the program name is “c”, and the number of broadcasts is “d”.

  Reception of the data broadcast is started (Step 900), and the viewing history is distributed and recorded in the NVRAM every predetermined time (1 minute in this example) (Step 901).

  First, the current time is acquired from the TOT (Step 902). Subsequently, the program genre “b”, the program name “c”, and the number of broadcasts “d” are acquired from the data broadcast (Step 903).

  Each block of NVRAM is referred to (Step 904), and it is determined whether there is a block whose program name is “c” and the number of broadcasts is “d” (Step 905). If there is a block whose program name is “c” and the number of broadcasts is “d”, the viewing history has already been recorded and it is not necessary to record, so the process returns to Step 901.

  When there is no block with the program name “c” and the number of broadcasts “d”, the event name is “a” and the program genre is “b”. Is determined (Step 906). If it exists, increase the number of times of writing in the corresponding block by +1, write the event name “a” in the event name field, write the acquired current time in the update date / time field, and set the expiration date in the expiration date field. Write. Further, the program genre is set to “b”, the program name is set to “c”, and the broadcast count is written to “d”, respectively, and the viewing count is incremented by +1 (Step 907).

  On the other hand, if the event name is “a” and the program genre is not “b”, the initial value of n is set to 1 (Step 908), and an address with the nth smallest write count is searched (Step 909). If the number of writes is the same, the order is the address. If the event name of the block at the corresponding address is not “a” and is not valid (Step 910), the process proceeds to step 907. If the event name of the block at the corresponding address is “a” or is not out of the validity period, n is incremented by +1 (Step 911), and the process proceeds to step 909.

  In this way, since viewing history records are distributed and stored in a plurality of blocks of the non-volatile memory (non-volatile memory) of the receiver, the period until the end of the NVRAM (non-volatile memory) of the receiver Can be extended.

  Next, the operation of the counting unit 23 will be described. FIG. 21 is an operation flowchart of the counting unit 23.

  First, when receiving the data broadcast and requesting the execution of the point aggregation (Step 1000), the aggregation unit 23 refers to each block of the NVRAM and acquires the address of the block whose event name is “a” (Step 1001). .

  Next, the genre d and the number of viewing times of the corresponding address in all the acquired blocks of addresses are acquired (Step 1002).

  A personal viewing style is obtained from the acquired number of viewings for each genre, and is used for displaying data broadcasting in accordance with the viewing style.

  The gist of the present invention is that information is distributed and stored in a plurality of blocks of the non-volatile memory of the receiver. If it does not deviate from this gist, the method other than the method described in the above embodiment is used. Other methods may be used.

FIG. 1 is a block diagram of the embodiment. FIG. 2 is a diagram showing a description structure of each block of the NVRAM. FIG. 3 is an operation flowchart of the distributed storage unit 22. FIG. 4 is an operation flowchart of the counting unit 23. FIG. 5 shows an example of the NVRAM storage module. FIG. 6 shows an example of the NVRAM storage module. FIG. 7 shows an example of the NVRAM storage module. FIG. 8 shows an example of the NVRAM storage module. FIG. 9 shows an example of the NVRAM storage module. FIG. 10 is a diagram showing an example of the NVRAM storage module. FIG. 11 is a diagram showing a description structure of each block of the NVRAM in the second embodiment. FIG. 12 is an operation flowchart of the distributed storage unit 22 according to the second embodiment. FIG. 13 is an operation flowchart of the counting unit 23 in the second embodiment. FIG. 14 is a diagram showing a description structure of each block of the NVRAM in the third embodiment. FIG. 15 is an operation flowchart of the distributed storage unit 22 according to the third embodiment. FIG. 16 is an operation flowchart of the counting unit 23 in the third embodiment. FIG. 17 is a diagram showing a description structure of each block of the NVRAM in the fourth embodiment. FIG. 18 is an operation flowchart of the distributed storage unit 22 according to the fourth embodiment. FIG. 19 is an operation flowchart of the counting unit 23 in the fourth embodiment. FIG. 20 is a diagram showing a description structure of each block of the NVRAM in the fifth embodiment. FIG. 21 is an operation flowchart of the distributed storage unit 22 according to the fifth embodiment. FIG. 22 is an operation flowchart of the counting unit 23 in the fifth embodiment.

Explanation of symbols

1 broadcast station 2 television receiver 11 event message transmitting unit 12 NVRAM storage module sending unit ₂₀ 1 _{to 20} N NVRAM block 21 receiver 22 distributed storage unit 23 counting unit 24 output unit

Claims (18)

A data broadcasting system,
A data broadcasting system comprising distributed storage means for storing information recorded by data broadcasting in a plurality of blocks in a non-volatile memory of a receiver.   2. The data broadcasting system according to claim 1, wherein the information recording by the data broadcasting is reception recording of an event message.   3. The data broadcasting system according to claim 2, further comprising a totaling unit that totalizes reception records of event messages distributed and stored based on a predetermined rule. Means for sending an event message in which at least event identification information for identifying the event is described;
For each block of the nonvolatile memory, a field for storing at least the number of times of writing the block and the event identification information is provided.
The distributed storage means refers to the event identification information of the received event message and the write count and event identification information stored in the field of each block, and distributes and stores the received records of the received event message. The data broadcasting system according to claim 2.   2. The data broadcasting system according to claim 1, wherein the information recording by the data broadcasting is information recording by a program provided by the data broadcasting.   6. The data broadcasting system according to claim 5, wherein the recording of information by the program is a recording of viewing history by a program provided by data broadcasting. A data broadcasting method,
A data broadcasting method, wherein information recording by data broadcasting is distributed and stored in a plurality of blocks of a non-volatile memory of a receiver.   8. The data broadcasting method according to claim 7, wherein the information recording by the data broadcasting is reception recording of an event message.   9. The data broadcasting method according to claim 8, wherein reception records of event messages distributed and stored are aggregated based on a predetermined rule. Send an event message that contains at least event identification information that identifies the event,
Each block of the nonvolatile memory includes a field for storing at least the number of times the block is written and the event identification information;
The received record of the received event message is distributed and stored by referring to the event identification information of the received event message and the write count and event identification information stored in the field of each block. Item 9. The data broadcasting method according to Item 8.   8. The data broadcasting method according to claim 7, wherein the information recording by the data broadcasting is information recording by a program provided by the data broadcasting.   12. The data broadcasting method according to claim 11, wherein the recording of information by the program is a recording of viewing history by a program provided by data broadcasting. A data broadcasting program,
A program for causing a receiver to execute a process of storing recording of information by data broadcasting in a plurality of blocks of a non-volatile memory of the receiver.   14. The program according to claim 13, wherein the information recording by the data broadcasting is an event message reception recording.   The program according to claim 14, wherein the program causes the receiver to execute a process of aggregating reception records of distributed and stored event messages based on a predetermined rule. A process of storing at least the number of times of writing the block and the event identification information in each block of the nonvolatile memory;
An event message that includes at least event identification information that identifies an event is received, and the reception is performed with reference to the event identification information of the received event message and the write count and event identification information stored in the field of each block. 15. The program according to claim 14, wherein the receiver is caused to execute a process of distributing and storing received records of event messages.   13. The program according to claim 12, wherein the information recording by the data broadcasting is information recording by a program provided by the data broadcasting.   19. The program according to claim 18, wherein the recording of information by the program is a recording of viewing history by a program provided by data broadcasting.

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