JPH11205707A - Broadcast system utilizing time stamp and reception terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a broadcast system that uses a time stamp to manage information accurately in details. SOLUTION: In the broadcast system that broadcasts a stream including a time stamp, a time management section 1 of a reception terminal equipment monitors the time stamp of the stream that is broadcast. The section 1 receives the time stamp at an access point of time when accessing information broadcast in the past and stored in a storage device 3, a time stamp processing section 2 writes the time stamp to the information as control information and uses the time stamp for managing the information. Different from a conventional system that conducts information management based on its own timer information in the terminal equipment, information is accurately managed and an injustice of pretense of time is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a broadcasting system,
The receiving terminal device used in this system particularly uses broadcast time information (time stamp) for managing received information.

[0002]

2. Description of the Related Art In the era of digitization, test broadcasting of digital HDTV broadcasting using satellites is scheduled in the year 2000 in the broadcasting field in Japan, and the development of digital broadcasting by terrestrial broadcasting is being actively promoted. Have been.

In Europe, the standardization organization DVB has set standards for digital television broadcasting for satellite broadcasting, CATV, and terrestrial television broadcasting, and any standard can encode and multiplex video and audio. Adopts MPEG2. Digital satellite broadcasting conforming to this standard is 199
It has been starting for five years.

[0004] A group including the present inventors has been developing a next-generation digital broadcasting system in which a viewer can watch a desired program at his own pace without being restricted by the broadcast time.

In this broadcasting system, a data object called a digest is broadcast as a data broadcast. That is, the broadcast station multiplexes the digest and broadcasts the digest at the same time as a broadcast program (main program) using a normal video and audio.

[0006] As shown in FIG. 10, this digest includes multimedia information of a program introduction, a program trailer, a program, a CM,
Includes surveys, emails, application programs, or data, and the format is
A name 201 for uniquely determining the digest, management information 202 for managing the distribution of the digest, attribute information 203 representing the attribute of the digest, additional information in the terminal 204 added at the receiving terminal, and the content 205 Be composed. The name 201, the management information 202, the attribute information 203, and the additional information in terminal 204 are called tag information.

[0007] The management information 202 includes index information indicating what the content is, update information indicating the next update date and time of the digest and the current version number, information for controlling access to the digest, and information for security. , The broadcaster's date and time of the digest, the next rebroadcast, the address information of the database that stores the digest and the program introduced in the digest, the telephone number of the information provider that manages the database, and the information sender Information on the degree of recommendation indicating the audience segment that is watching is described.

The attribute information 203 includes data amount information indicating the respective data amounts of moving images, still images, texts, and the like included in the contents, keyword information attached to the contents, method information for associating the contents, and digests. Reference information for associating the information, sponsor information indicating a sponsor name when the content is a CM, and the like are described.

The additional information 204 in the terminal is information added by the user terminal for various kinds of processing at the user terminal, and includes a digest reception status, a status indicating a storage state, and who the user is. , User management information indicating how much access to the database, relevance information indicating the relevance of the user to the digest keyword (how much the user views the digest having the keyword), and the digest , And freshness information indicating the next broadcast date and time are described.

As described above, the digest includes various multimedia contents such as program-related information, CM product information, and EPG information related to the digest, and a script for controlling simple dialogue management with the user. The information includes information introduced in the digest or information on an access path to the digest itself.

This digest is broadcast from a broadcasting station,
A large number of digests that match the viewer's preferences are automatically stored in the receiving terminal. The viewer can enjoy the accumulated digest by displaying it on the receiving terminal at a convenient time. In addition, the viewer can use the stored digest as a means for searching for a main program to be watched or detailed information, as if the user searched a telephone directory.
When the main program or detailed information to be watched is found, the receiving terminal obtains the information from the information provider through communication means,
Display on the receiving terminal.

This broadcasting system, as shown in FIG.
A broadcasting station 330 for performing data broadcasting, a user terminal 304 for receiving the broadcasting station, and an information provider 3 having a database
40 and a broadcast line 305 from the broadcast station 330 to the user terminal 304
And a communication line 320 connecting the user terminal 304 and the information provider 340. The broadcasting station 330 includes an information generating means 300 for generating digest information, and a multiplex for multiplexing the generated digest with information of the main program. Means 301, a scrambler 302 for scrambling data to be concealed in the generated transport stream (TS),
And a transmitting unit 303 for transmitting the stream.

The user terminal 304 includes a receiving unit 306 for receiving information from the broadcasting station 330 and the information provider 340, a scheduling unit 319 for formulating a tuning plan for selecting a receiving channel, and Demultiplex routing means for decomposing the video and audio information of the main program and the digest and switching the output destination
307, descrambling means 310 for descrambling the video and audio information to be viewed, and access control means 311 for charging in exchange for the descrambling of the video and audio information.
Charging means 312 for executing a charging process; display means 313 for displaying video / audio information of the main program and the contents of the digest; storage means 309 for storing the digest; and controlling the storage of the digest to store the digest in the directory. Cache and directory control means 308 to be registered
And a preference storage unit 315 for storing a user's viewing history and the like.
Filtering means 314 for evaluating accumulated digests and assigning priority to accumulation; input means 316 such as a remote controller operated by a viewer; and searching for accumulated digests based on instructions from input means 316. Human interface / search means 317 and information provider 3
And communication means 318 for accessing the.

The information provider 340 includes a large-capacity database function 323 for storing digests and main programs, a search means 322 for searching a database, and a communication means for communicating data with the user terminal 304. 321.

Further, as shown in FIG. 9, the user terminal 304 demultiplexes the received data with the antenna 100 and the tuner 102 constituting the receiving means 306 as hardware for realizing the functional blocks of FIG. Multiplexing and routing router 103, scheduling means 319 and cache and directory control means 308
O processor & work memory 109, storage device interface 116 and built-in disk 119 constituting storage means 309,
An external storage device interface 117 and an external storage device / medium 118; a descrambler 105; an MPU & local memory 106 and a flash memory 107;
An access control module card 104 in which the local memory 106 and the flash memory 107 perform accounting processing, a decoder 113 for decoding descrambled audio,
A decoder 112 for decoding the descrambled video information, a D / A conversion rate converter 115 for converting the decoded audio signal into an analog signal, and a graphic display control unit for controlling the display of the decoded video signal
114, a display device 121 such as a TV, and a remote control 11 of the user.
Remote control interface 110 that accepts requests from 1
And a modem 120 constituting a communication means 318 with the information provider 340, and controls the modem 120 and the graphic display control unit 114 to function as a human i / f / search means 317, a filtering means 314, or a preference storage means 315. C
A PU & main storage unit.

The operation of the broadcasting system will be described. In this system, the transmission medium for broadcasting the digest is not particularly limited, but here,
The following describes an example of a practical digital satellite broadcast. The basic format of satellite digital broadcasting conforms to the DVB standard, and a transport stream of the MPEG-2 standard is loaded on a transponder. Therefore, by multiplexing the digest object data with a normal video / audio broadcast program to generate MPEG-2 data, digest broadcast in satellite digital broadcast becomes possible.

The generation of the digest information is performed by the information generating means 300 using an authoring device. The detailed information such as the generated digest and the main program information introduced by the digest is stored in the large capacity database 322 of the information provider 340, and information on the access path to the large capacity database 322 (the telephone number of the information provider and The database address information is also written in the digest tag information.

The generated digest is sent to the multiplexing means 301.
Multiplexed with the main program information as MPEG-2 data, the data to be concealed in the transport stream is scrambled by the scrambler 302, and broadcast via the transmission means 303 via the satellite line 305.

This transport stream is received by the receiving means 306 of the receiver 304 of the user. At this time, the scheduling means 319 controls the tuning operation for selecting a reception channel as follows.

First, the scheduling means 319 acquires an EPG digest having a broadcast schedule of each digest as content while taking the form of the digest,
On the basis of the digest tag information included in the EPG information, a tuning plan is created so that a digest close to the user's preference can be obtained. The digest EPG information is a set of data corresponding to the digest tag information shown in FIG.

The scheduling means 319 obtains a digest that is close to the user's preference, so that the recommendation information of the management information included in the tag information and the user personality information, that is, the age of the user set in advance by the user. And information including gender, basic preference information, and the like, are quantitatively determined. Then, at the broadcast time of the digest having a large value, a tuning plan is created so as to receive the corresponding channel, and the receiving means 306
Control.

The received data is demultiplexed
The digest is decomposed into video / audio information and a digest of the program by the routing unit 307, and the digest is temporarily stored in the cache area of the storage unit 309 via the cache and directory control unit 308.

On the other hand, the video / audio information to be viewed in real time is sent to the descrambling means 310 as it is, and under the control of the access control means 311, a charging process is performed by the charging means 312. The access control unit 311 passes the scramble key for descrambling the billed program to the descramble unit 310, and the descramble unit 310 descrambles the program. The program that can be viewed is displayed on the display unit 313, and the user can see it.

The digest stored in the cache area of the storage unit 309 is evaluated by the filtering unit 314 after a certain period of time. At this time, the filtering unit 314 determines whether or not the digest content matches the viewer's preference, based on the user's viewing history stored in the preference storage unit 315, or whether the elapsed time or the content since the digest was received. Judgment is made as to whether or not the freshness of the information is high in view of the time until the update or the like, and the digest priority is set.

Cache and directory control means 308
Stores the digest with the priority in a file of the storage means 309 and registers it in the directory.
Further, the cache and directory control unit 308 discards the digest or replaces the digest with a file according to the priority so that the storage capacity of the storage unit 309 is not exceeded.

A part of the internal disk 119 is used for the cache area of the storage means 309, and the internal disk 119
And the external storage device / medium 118 are stored in storage means 309.
Used as a file.

When the user instructs access to the stored digests using input means 316 such as a remote controller, the human i / f / search means 317 executes a directory browser, and executes a directory browser. The digests stored in the file are organized and displayed on the display unit 313 so that the entire image can be grasped. When the user selects one of the digests, the human i /
f. The search means 317 searches the selected digest and displays it on the display means 313. The directory browser is executed as an application program of the CPU 108, and is displayed on the display device 1 through the graphic display control unit 114.
Displayed on the 21 screen. That is, the digest is interpreted and controlled by the directory browser in the user terminal 304.

As described above, the user uses the directory browser of the user terminal 304 to watch the preview of the main part included in the digest content, or to view the product introduction (CM) using the interactive content, etc. Digest broadcast).

The user looks at the digest and, if more detailed information is required, gives an instruction to that effect from the input means 316. Based on this instruction, the CPU 10
Reference numeral 8 issues an access request from the communication means 318 to the database (information provider 340) via the communication line 320 based on the access path information recorded in the digest.

In the information provider system, the request is received by the communication means 320, the search means 320 is activated, the corresponding information set by the information creator is searched from the large-capacity database 322, and transmitted to the user terminal 304 through the communication means 320. Send out. The user terminal 304 receives the data via the communication means 318 and sends it to the receiving means 306. The data thus obtained follows the same route as the data received from the broadcast line 305 and is displayed on the display unit 313, so that the user can view it.

In the digest broadcasting, an update digest for updating a previously broadcasted one is repeatedly spot-likely repeated at any time together with a new digest broadcasted for the first time (this is called a directory broadcast). In some cases, subtitle information, additional information, and the like related to the main program by video and audio are broadcast only in the broadcast time zone of the main program (this is called program additional information broadcasting).

In the receiver, a database of digests to be broadcast can be constructed by storing the record of the directory broadcast. Further, since the update information is streamed in the directory broadcast, the information can be automatically managed only by performing the update according to the update information.

FIG. 11 shows an example of a digest broadcast mode. In FIG. 11, three broadcasters (SportT
V, LiveTY, and PanaTV) show program information to be broadcast in a certain time zone and digest broadcasting being broadcast at the same time. Each broadcaster performs program broadcasting and digest broadcasting in parallel.

Of the three broadcasters, SportsTV specializes in digest broadcasting, which is closely related to the main program, and performs directory broadcasting. In such a case, there is an advantage that the user can intensively store digests having related themes while watching the main program.

In LiveTV, a directory broadcast and a program additional information broadcast are multiplexed and broadcast. In such an example, when the program additional information is relatively small, a general directory broadcast can be slowly performed over a long period of time while using the vacant band. In the case of providing information centered on the main program (which does not require additional information), such a form can be adopted.

In PanaTV, a directory broadcast centered on a product guide CM and a program additional information broadcast are always multiplexed and broadcast. This is an advantageous method for sending a digest that is frequently repeated or updated.

By viewing the information obtained by such a digest broadcast using the directory browser of the receiver, the user can enjoy a preview of the main part included in the digest, a product introduction (CM), and the like.

The digest can be an entry of general information in the world through a television program, and the detailed information can be easily extracted through an access path to a database in which the detailed information is accumulated. Can act as a directory. Such an access method can be compared to a telephone directory. Since the digest contains the essence of the entire information, it can be determined by browsing the telephone directory as to whether the information itself is really necessary for the user.

[0039]

SUMMARY OF THE INVENTION The present invention seeks to construct a digest broadcasting system or a conventional broadcasting system that effectively utilizes a time stamp (time information) broadcast from a broadcasting station on the receiving side. I have.

MPEG which is a standard for digital broadcasting
In the 2-TS, two types of time stamps are used. One is a time reference indicating when each unit of video and audio decoding and reproduction (called an access unit; for example, for video, each frame) should be reproduced, and the other is a system time reference reference value. It is a time reference called.

In the former, the PTS (Pr
esentation Time Stamp) and DTS (Decording Time)
Stamp). The PTS gives frame information that can be expressed for 24 hours a day, and the DTS gives time information when the temporal order of the codes is changed due to the encoding system.

The latter includes an SCR (System Clock Referen
ce) and PCR (Program Clock Reference)
On the decoding side, a basic synchronization signal STC (System Tim
e Clock) is information for setting and configuring the value intended by the encoder.

In the conventional broadcasting system, the time stamp is used for synchronizing video and audio, and is used for adjusting a timer of a video device having a timer. However, it is not used any more.

It is an object of the present invention to provide a broadcasting system capable of performing information management accurately and finely using a time stamp, and to provide a receiving terminal device for realizing the system.

[0045]

According to the broadcasting system of the present invention, the receiving terminal monitors the time stamp of the stream being broadcast, and when accessing the information broadcasted and stored in the past, the time at the time of access is determined. A stamp is written in the information as control information, and a time stamp is used for managing this information.

In the receiving terminal device of the present invention, the storage means for storing the received digest and the time stamp of the stream being broadcast are monitored, and when an access to the digest stored in the storage means is instructed, There are provided time management means for capturing the time stamp at the time of access, and time stamp processing means for writing the time stamp captured by the time management means in the tag information of the digest to be accessed.

Therefore, unlike the conventional system which manages information based on its own timer information in the terminal, accurate information management becomes possible, and the user may falsify the time to view illegally. Can be prevented.

[0048]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, in a broadcasting system in which a stream including a time stamp is broadcast, a receiving terminal device monitors a time stamp of a stream being broadcast, and When accessing broadcasted and stored information, a time stamp at the time of access is written as control information in the information, and the time stamp is used for managing this information. Unlike a conventional system that performs information management by using a computer, accurate information management can be performed, and improper false time can be prevented.

According to a second aspect of the present invention, a broadcast station broadcasts a digest including tag information as control information and content as main body information in a stream, and a receiving terminal device stores the received digest, When accessing the stored digest, the time stamp at the time of access is written as the tag information of the digest, and information management of the digest received by broadcasting can be performed using the time stamp.

According to a third aspect of the present invention, the receiving terminal device discards the digest whose information has expired based on the time stamp, and determines the digest to be discarded based on the time stamp. Can be sorted out.

According to a fourth aspect of the present invention, the receiving terminal device calculates the priority of the stored digest based on the time stamp, and selects the digest to be discarded based on the priority. , The digest priority can be calculated using the time stamp.

According to a fifth aspect of the present invention, the receiving terminal device writes a time stamp in the digest for which the content is to be displayed, and stops displaying the expired content based on the time stamp. And whether the display of the content is appropriate or not can be selected based on the time stamp.

According to a sixth aspect of the present invention, the receiving terminal device writes a time stamp on the digest displaying the content and obtains the viewing history of the user based on the tag information of the digest on which the time stamp is written. Since the displayed digests are all time-stamped, by collecting tag information of the digests in which the time stamps have been written, it is possible to count which content was viewed and when.

According to a seventh aspect of the present invention, the receiving terminal device writes a time stamp in the digest for displaying the content, and changes and displays the content of the content based on the time stamp. For example, it is possible to change the display of “until the Olympics, 〇〇 days to go” to the remaining days according to the time of viewing and display it.

According to the invention described in claim 8, the broadcasting station broadcasts the stream including the time stamp including the decryption key, and the receiving terminal device adds the time stamp at the time of access to the tag information of the digest to be accessed. The decryption key is written, and by using the time stamp and the key information together, it is possible to control the display content to distinguish the time.

According to the ninth aspect of the present invention, after the broadcast station encrypts and broadcasts the digest, the broadcast terminal broadcasts the decryption key together with the time stamp after a predetermined period has elapsed, and the receiving terminal device displays the content. A timestamp and a decryption key are written in the digest, the encrypted digest is decrypted with the decryption key, and the content is displayed, so that the user can view and listen to the digest until a specific timestamp is received. Can be prevented.

According to a tenth aspect of the present invention, a broadcasting station uses a decryption key for decrypting a part of an encrypted pay program in a stream broadcast during a period in which a pay program can be previewed. The period during which the preview can be performed can be controlled later through the broadcast.

According to an eleventh aspect of the present invention, in a receiving terminal device of a broadcasting system, a digest including tag information as control information and content as main body information is broadcast in a stream including a time stamp. Means for monitoring the timestamp of the stream being broadcast, and when instructed to access the digest stored in the storage means, time management means for taking in the timestamp at the time of access; and A time stamp processing means for writing a time stamp taken by the time management means into the tag information is provided, and constitutes a receiving terminal device of the broadcasting system according to claim 2.

According to a twelfth aspect of the present invention, there is provided filtering means for comparing the expiration date of the information of the digest in which the time stamp is written with the time stamp, and discarding the digest whose information has expired. This constitutes the receiving terminal device of the broadcasting system according to claim 3.

According to a thirteenth aspect of the present invention, there is provided a receiving terminal device for a broadcast system according to the fourth aspect, further comprising filtering means for calculating the priority of the digest in which the time stamp is written by using the time stamp. Is configured.

According to a fourteenth aspect of the present invention, there is provided a display control means for comparing a display time limit of a digest in which a time stamp is written and the time stamp, and displaying only the content of the digest whose time stamp is within the display time limit. The receiving terminal device of the broadcasting system according to claim 5 is provided.

According to the fifteenth aspect, a part of the digest content in which the time stamp is written is
A time shift reproduction processing means for correcting based on the time stamp is provided, and constitutes a receiving terminal device of the broadcast system according to claim 7.

According to a sixteenth aspect of the present invention, there is provided a broadcast system receiving terminal for broadcasting a digest including tag information as control information and content which is main body information, and a decryption key in a stream including a time stamp. A storage means for storing the received digest in the device;
The time stamp of the stream being broadcast is monitored, and when access to the digest stored in the storage unit is instructed, the time management unit that captures the time stamp and the decryption key at the time of access, and the tag information of the digest to be accessed And a time stamp processing means for writing the time stamp and the decryption key taken in by the time management means, and constitute a receiving terminal device of the broadcast system according to claim 8.

The invention according to claim 17 is provided with display control means for displaying the digest content after decrypting the digest cipher in which the time stamp and the decryption key are written using the decryption key. This constitutes the receiving terminal device of the broadcast system according to claims 9 and 10.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) In the first embodiment,
A receiving terminal device of a digest broadcasting system that uses a time stamp for information management will be described.

This receiving terminal device corresponds to the user terminal 30 shown in FIG.
As shown in FIG. 1, the time management unit 1 takes in the time stamp at the time of accessing the digest, and the digest obtained from the storage device 3 (corresponding to the storage unit 309 in FIG. 8) has the time stamp. And a time stamp processing unit 2 for writing the same.

This receiving terminal device has a PLL (Phase Locked Loop) for generating an STC (basic synchronization signal) from SCR or PCR included in MPEG2-TS.
Is provided.

The PLL comprises a digital / analog converter 11, a low-pass filter 12, a voltage controlled oscillator (VCO) 13, a counter 14, and a comparator 15, as shown in FIG. The SCR or PCR and the STC output from the counter 14 are input to the comparator 15, and the difference is output from the comparator 15. This difference is converted into an analog signal and input to the VCO 13, the VCO 13 outputs a signal having an oscillation frequency corresponding to the difference, and the counter 14 counts this oscillation frequency. Thus, the counter 14 outputs the SC
STC synchronized with R or PCR is stably output. This STC stores time information.

This STC is input to the time management section 1.
In addition, an instruction to access the digest is input to the time management unit 1 from an application program that performs search, display, deletion, and the like of the digest. The time management unit 1 continues to monitor the STC, and when an access to the digest is instructed from the application program,
Execute the daemon process to capture the time information at that time. Then, the acquired time information and the instruction of the application program are transmitted to the time stamp processing unit 2.

The time stamp processing unit 2 obtains the corresponding digest from the storage device 3 and writes the time information as an access record in the terminal additional information description area of the tag information of the digest. Then, the digest 4 describing the time information is output to the processing means instructed by the application program.

As described above, in the receiving terminal device of the digest broadcasting system, the time stamp is recorded on the digest to be accessed, and is used for digest information management. How to use this will be described in detail in the following embodiments.

(Second Embodiment) In the second embodiment,
The use of a time stamp for selecting digests to be discarded will be described.

As described above, the received digest is temporarily stored in the cache area of the storage unit 309, and then the priority is determined by the filtering unit 314. Based on the priority, the digest to be stored again in the storage unit is determined. Be sorted out. Even after being stored again in the storage means, if the storage capacity for storing the newly received digest is insufficient or the cache area needs to be expanded, the priority of the stored digest is changed. It is rechecked, the lower priority digests are discarded, and the accumulation of the digests is replaced.

The priority is determined based on the user's viewing history stored in the preference storage means 315 as to whether the digest content matches the viewer's preference (degree of coincidence with the viewer's preference), Whether the value of the information is high in view of the elapsed time after reception or the time until the content is updated (freshness of the information), and whether a large amount of storage capacity can be created when the content is discarded Judgment is made based on the point (advantage of disposal).

Of these, the degree of coincidence with the viewer's preference does not change once it is calculated. On the other hand, the value of the freshness of information changes with time. In addition, the data amount of content indicating the advantage of discarding is calculated by multiplying the value of the capacity of each content tier by the number of content used together. May change. Therefore, the value obtained by multiplying the freshness of information and the value indicating the advantage of disposal is defined as an age coefficient.
The priority of the digest from the second time is calculated by recalculating only the age coefficient and using the calculated value and the “degree of agreement with viewer preference” obtained before.

In order to calculate this priority, as shown in FIG. 2, time information is recorded in the digest by the procedure of the first embodiment, and the digest is transmitted from the time stamp processing unit 2 to the filtering means 5 (FIG. 8). Corresponding to the filtering means 314).

The filtering means 5 calculates the difference between the digest reception time and the current time written as time information to determine the elapsed time, and calculates the difference between this current time and the next update date and time of the digest. And ask for the expiration date of the information. Then, for the elapsed time, the numerical value is set so that the larger the value, the smaller the value.
For the expiration date, the smaller the value is, the numerical value is set so as to take a smaller value, and the values are added to calculate the freshness of the information.

Further, in order to make it easy to discard contents having a large data amount, the data amount of the contents is multiplied by the number of contents used together. Digitize. Then, the age coefficient is obtained by multiplying the value by the freshness of the information.

On the other hand, the “degree of coincidence with viewer preference” is the logical product of the degree of viewer recommendation and the user personality (ie, a value indicating the degree of coincidence between the degree of viewer recommendation and the user personality), and It is calculated by multiplying the logical product of the basic keyword attached to the digest content and the viewing tendency keyword obtained from the viewing history (that is, a value indicating the degree of coincidence between the basic keyword and the viewing tendency keyword).

The digest accumulation priority is calculated by multiplying the “coincidence with viewer preference” by the age coefficient.

As described above, the time information written in the digest can be used for calculating the digest priority and selecting the digest to be discarded.

It is also possible to provide a daemon processing means for reading the time stamp written in the digest and discarding the expired digest. The daemon processing means periodically (for example, once a day) reads out a digest time stamp, and performs a garbage collection operation of collecting and discarding expired digests.

Also, in a broadcasting system other than the digest broadcasting, the time information can be used for selecting a file to be discarded. For example, in a broadcasting system that transfers an application program file through a broadcast wave according to a user's request, if the receiving device writes time stamp information in a file received, the time stamp is used when a viewer uses an application. Based on the information, it becomes possible to discard expired information and manage the version number of the application and the version number of the data.

(Third Embodiment) In the third embodiment,
Display control using a time stamp will be described.
In this case, as shown in FIG. 3, a time stamp is recorded in the digest displayed by the browser according to the procedure of the first embodiment, and the display control unit 6 (descrambling unit 310 in FIG. Access control means 3
11, corresponding to the display means 313).

The display control means 6 judges whether or not to access the digest for which the access time limit is set, based on the time stamp recorded in the digest, displays only accessible contents, and displays the accessible content. Stop displaying unacceptable content.

As described above, when the digest is used, the expired information can be checked by always referring to the time stamp recorded therein.

In this case, if time management is performed based on the own timer information in the receiving terminal as in the prior art, when the timer information is shifted or when the user falsely sets the system clock information, A situation occurs where inaccessible content is displayed.

However, when time management is performed using a time stamp as in this embodiment, it is possible to eliminate such improper time information.

Further, if the time stamp is written in the additional information description area in the terminal of all the digests to be displayed, it is possible to distinguish whether the digest has been viewed or not based on the presence or absence of the time stamp. By collecting only the digests with stamps and totaling the tag information, the viewing history can be acquired.

Further, if the ID of the receiving terminal device is encrypted and written into this additional information description area in the terminal together with the time stamp, the broadcasting station or the information provider can
The viewing history of each receiving terminal device can be obtained by extracting the tag information of each digest from the receiving terminal device by uplinking. At this time, the broadcast station or the information provider can identify the viewing time based on the time stamp.

(Fourth Embodiment) In the fourth embodiment,
A method for realizing various services by using a time stamp and key data such as decryption will be described.

This key information is, as shown in FIG.
PES in EG2 PS (Program Stream)
(Packetized Elementary Stream) is transmitted from a broadcasting station together with a time stamp in a stuffing byte area of a packet.

The key information received by the receiving terminal device is input to the time management unit 1 together with the time information as shown in FIG. 4, and is output from the time management unit 1 to the time stamp processing unit 2. The time stamp processing unit 2 writes the time information and the key information in the terminal additional information description area of the digest obtained from the storage device 3. The digest in which the information is written is output to the display control means 6.

For example, prior to the main broadcast of a cooking program, a digest having a recipe of the cooking as a content is broadcast in a digest, but the receiving terminal device receiving the digest displays the content before the broadcast of the main broadcast. When it is necessary to prevent the content from being displayed, the display of the content can be prevented by the following method.

First, the broadcasting station encrypts the digest content with a predetermined key, and then broadcasts the digest prior to the main broadcast of the cooking program.

[0097] The receiving terminal device that has received this digest cannot display it because the content is encrypted.

[0098] The broadcasting station starts the main broadcast of the cooking program at the broadcasting time of the cooking program, and transmits a decryption key together with a time stamp in this broadcasting time zone.

When the user tries to display a digest having a recipe as a content on the receiving terminal device during the broadcasting time of the cooking program, the digest read from the storage device 3 is added to the digest by the time stamp processing unit 2. , Time information and decryption key information are written. The digest in which the decryption key is written is output to the display control means 6, and the display control means 6 can decrypt and display the content of the digest with the decryption key.

As described above, by using the time information and the key information in combination, it is possible to configure a mechanism in which the broadcast information cannot be referred to until a specific time stamp is received.

Also, by transmitting the decryption key together with the time information from the broadcasting station during the service period, it is possible to implement a service of viewing the digest of the stored paid program free of charge only during the service period.

In this case, when a paid digest is displayed during the service period, a decryption key is written in the tag information of the digest. Therefore, the display control means 6
Can decrypt the digest content with a decryption key and display it. On the other hand, if the digest is to be displayed after the service period, a code other than the decryption key is written in the tag information of the digest. Therefore, the display control means 6 cannot decrypt the digest content unless a fee is paid.

In the case of pay broadcasting, a preview of broadcasting the first few minutes of the pay broadcasting without encryption is performed to introduce the contents of the program. By using the time information and the decryption key together, the preview is performed. The period during which the preview is possible can be controlled later through the broadcast.

In this case, the broadcasting station encrypts the pay program to be broadcast by changing the key between the time zone of the first few minutes and the time zone thereafter. During the period when the program can be previewed, along with the time stamp,
It broadcasts a decryption key that decrypts the code for a few minutes at the beginning of the program. By doing so, the preview can be performed only during the period specified by the broadcasting station.

(Fifth Embodiment) In the fifth embodiment,
A system for correcting the stored program contents in accordance with the viewing time will be described.

As shown in FIG. 5, the receiving terminal device of this system includes a time shift reproduction processing section 7 for correcting the content of the content based on the viewing time zone or the difference between the broadcast time and the viewing time. .

[0107] The time shift reproduction processing section 7 converts the data at the specific position of the content represented by the pointer information into
The correction is made based on the viewing time zone indicated by the time stamp or the difference between the broadcast time and the viewing time.

[0108] For example, the viewing time of the news program, if it is seen to 6 pm or later from the time stamp, change the contents of the greeting at the beginning to "Good evening", also, to "Hello" if the 6 o'clock the previous afternoon Change. The display control means 6 displays the corrected content, so that the display content can be properly used according to the viewing time.

If a program that answers a quiz or a questionnaire is recorded and viewed after the time limit for answering the question, the time-shift playback processing unit 7 sends a message indicating that the time limit for answering has passed. Or garbage processing is performed based on the pointer information so that a scene for which an answer is requested is not displayed.

Also, "until the Olympics, xx days left"
Is displayed based on the difference between the broadcast time and the viewing time.
It is possible to convert and display the number of days at the time of actual viewing.

As described above, in this system, the display contents of the stored program can be changed and corrected based on the time stamp. Although the description here has focused on digest broadcasting, this system can also be applied to other broadcasting systems.For example, it is possible to display earthquake information displayed on the screen during recording, except during playback, etc. Becomes

[0112]

As is apparent from the above description, the broadcasting system of the present invention differs from the conventional system in which information management is performed based on the own timer information in the terminal, by using the time stamp broadcast from the broadcasting station. Since it is used for information management, it is possible to realize accurate management and to prevent improper false time.

Based on this time stamp, selection of digests to be discarded, calculation of digest priority,
It is possible to identify whether or not the display of the content is appropriate and to correct the display content of the content.

Also, by collecting the tag information of the digest in which the time stamp has been written, it is possible to count which content was viewed at what time.

Further, by using the time stamp and the key information together, it is possible to restrict the display until a specific time or to control the period during which the preview can be performed later through the broadcast.

Further, the receiving terminal device of the present invention can realize such a broadcasting system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a receiving terminal device according to a first embodiment;

FIG. 2 is a block diagram showing a configuration of a receiving terminal device according to a second embodiment;

FIG. 3 is a block diagram illustrating a configuration of a receiving terminal device according to a third embodiment;

FIG. 4 is a block diagram showing a configuration of a receiving terminal device according to a fourth embodiment;

FIG. 5 is a block diagram showing a configuration of a receiving terminal device according to a fifth embodiment;

FIG. 6 is a configuration diagram of a PLL that generates an STC;

FIG. 7 is a diagram showing a data structure of an MPEG2-program stream;

FIG. 8 is a block diagram showing a configuration of a digest broadcasting system;

FIG. 9 is a block diagram showing a configuration of a receiving terminal device of the digest broadcasting system;

FIG. 10 is an explanatory diagram showing a digest format;

FIG. 11 is an explanatory diagram showing an example of a digest broadcast program table.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Time management part 2 Time stamp processing part 3 Storage device 4 Digest 5 Filtering means 6 Display control means 7 Time shift reproduction processing part 11 Digital / analog converter 12 Low pass filter 13 Voltage controlled oscillator 14 Counter 15 Comparator 100 Antenna 102 Tuner 103 Router 104 Access Control Module Card 105 Descrambler 106 MPU & Local Memory 107 Flash Memory 108 CPU & Main Memory 109 IO Processor & Work Memory 110 Remote Control Interface 111 Remote Control 112 Digital Video Decoder 113 Digital Audio Decoder 114 Graphic Display Control 115 D / A Conversion Rate Converter 116 Storage interface 117 External storage interface 118 External storage / medium 119 Internal disk 120 Modem 121 Display 122 Telephone line 200 Digest 201 Name 202, 206 Management information 203, 207 Attribute information 204, 208 Terminal additional information 205, 209 Content 300 Information generation means 301 Multiplexing means 302 Scrambler 303 Transmission means 304 User terminal 305 Broadcasting line 306 Receiving means 307 Demulti Plex routing means 308 cache and directory control means 309 storage means 310 descrambling means 311 access control means 312 billing means 313 display means 314 filtering means 315 preference storage means 316 input means 317 human i / f search means 318 communication means 319 scheduling Means 320 Communication line 321 Communication means 322 Search means 323 Large capacity database function 330 Broadcasting station 340 Information provider

Continuing on the front page (72) Inventor Isao Masuda 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazuhiro Machida 1006 Oji Kadoma Kadoma City, Osaka Matsushita Electric Industrial Co.

Claims (17)

[Claims] 1. In a broadcasting system in which a stream including a time stamp is broadcast, a receiving terminal device monitors a time stamp of a stream being broadcast and accesses an information broadcast and stored in the past. A time stamp written in the information as control information, and using the time stamp for managing the information. 2. A broadcasting station broadcasts a digest including tag information as control information and content as main body information in the stream, and a receiving terminal device stores the received digest, and stores the digest in the stored digest. 2. The broadcasting system according to claim 1, wherein when accessing, a time stamp at the time of access is written as tag information of the digest. 3. The broadcasting system according to claim 2, wherein the receiving terminal device discards the digest whose information has expired based on the time stamp. 4. The receiving terminal device according to claim 2, wherein the receiving terminal device calculates a priority of the stored digest based on the time stamp, and selects a digest to be discarded based on the priority. Broadcast system. 5. The receiving terminal device writes the time stamp in the digest whose content is to be displayed, and cancels the display of the expired content based on the time stamp. The broadcasting system according to 1. 6. The receiving terminal device writes the time stamp in the digest displaying the content, and obtains a viewing history of the user based on tag information of the digest in which the time stamp is written. Item 3. The broadcasting system according to Item 2. 7. The receiving terminal device according to claim 2, wherein the receiving terminal device writes the time stamp in the digest for displaying the content, and changes and displays the content of the content based on the time stamp. Broadcast system. 8. A broadcasting station broadcasts a stream including the time stamp including a decryption key, and a receiving terminal device includes, in the tag information of the digest to be accessed, a time stamp at the time of access and the decryption key. 3. The broadcast system according to claim 2, wherein 9. A broadcasting station broadcasts the decryption key together with a time stamp after a predetermined period has elapsed after encrypting and broadcasting the digest, and a receiving terminal device adds the time stamp to the digest displaying content. 9. The broadcast system according to claim 8, wherein the content is displayed by decrypting the encrypted digest with the decryption key and writing the encrypted digest. 10. The broadcast station includes the decryption key for decrypting a part of the encrypted pay program in the stream broadcast during a period that enables preview of the pay program. The broadcasting system according to claim 9, wherein 11. A stream containing a timestamp,
In a receiving terminal device of a broadcasting system in which a digest including tag information as control information and content as body information is broadcast, a storage unit for storing the received digest, and a time stamp of a stream being broadcast is monitored. When access to the digest stored in the storage unit is instructed, a time management unit that captures a time stamp at the time of access, and the tag information of the digest to be accessed includes the time stamp captured by the time management unit. A receiving terminal device comprising: a time stamp processing unit for writing. 12. The apparatus according to claim 1, further comprising filtering means for comparing the expiration date of the information of the digest in which the time stamp is written with the time stamp, and discarding the digest whose information has expired. 12. The receiving terminal device according to item 11. 13. The receiving terminal device according to claim 11, further comprising filtering means for calculating a priority of the digest in which the time stamp is written by using the time stamp. 14. A display control means for comparing the display time limit of the digest in which the time stamp is written with the time stamp, and displaying only the content of the digest whose time stamp is within the display time limit. The receiving terminal device according to claim 11, wherein 15. The receiving terminal device according to claim 11, further comprising a time-shift reproduction processing unit that corrects, based on the time stamp, a part of the digest content in which the time stamp is written. . 16. A stream containing a timestamp,
In a receiving terminal device of a broadcasting system in which a digest including tag information as control information and content as main body information and a decryption key are broadcast, storing means for storing the received digest, storing means for storing the received digest, A time stamp is monitored, and when access to the digest stored in the storage unit is instructed, a time management unit that captures the time stamp and the decryption key at the time of access; and tag information of the digest to be accessed, A receiving terminal device comprising: a time stamp processing unit that writes the time stamp and the decryption key captured by the time management unit. 17. A display control means for decrypting the digest code in which the time stamp and the decryption key are written using the decryption key and displaying the content of the digest. The receiving terminal device according to claim 16.