JPH11205257A - Digital broadcasting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive necessary data without adding common data to each separate data and sending it by receiving the common data with a 1st receiving means when the common data to which a code is added and separate data are received and receiving the separate data with a 2nd receiving means when the code of the separate data coincides with a stored inherent code. SOLUTION: News data include nationwide common data, plural local data and respective codes. A digital broadcasting receiver 10b extracts news data from received digital satellite broadcasting signals by a descramble circuit 30 and a transport stream processing circuit 32 and stores them in memory 44 and a CPU 46 for control extracts the nationwide common data and the local data among news data by utilizing inherent codes stored on an IC card 26, synthesizes both data and stores them in the memory 44. Thus, it is possible to show news that includes nationwide common data and self-local data on a TV receiver 38.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital broadcast receiver and a digital broadcast system, and more particularly to a digital broadcast receiver and a digital broadcast system used for, for example, CS (communication satellite) broadcasting.

[0002]

2. Description of the Related Art In satellite digital TV broadcasting, an information service for multiplexing video and audio data and providing news and the like to viewers has been proposed, and service experiments in a laboratory have been started.

In general, news includes information common to the whole country and information for a specific area. Therefore, even in the above-mentioned information service, data including information common to the whole country and information for a specific area is transmitted. Must.

Therefore, in the service experiment, for example, in order to supply news to the regions 1 and 2 respectively, the broadcasting station side needs to provide nationwide common data and information for the region 1 as shown in FIG. A code for region 1 is added to the region data 1 that is the same as the region data 1, and a code for region 2 is added to the nationwide data that is the information common to the whole country and the region data 2 that is the information for region 2. Has been adopted, and each receiving terminal has adopted a method of extracting only data having a local code for the receiving terminal and receiving news.

[0005]

In the above-mentioned prior art,
Since the nationwide common data is added and transmitted for each area data, the nationwide common data is transmitted redundantly.
Therefore, there is a problem that the amount of data to be transmitted increases.

[0006] Therefore, a main object of the present invention is to provide a digital broadcast receiving apparatus and a digital broadcast system which can receive necessary data even if the amount of transmitted data is small.

[0007]

According to a first aspect of the present invention, there is provided a digital broadcast receiver for receiving common data and individual data each having a code added thereto. Storage means for storing the unique code, first receiving means for receiving the common data, comparison means for comparing the code of the individual data with the unique code,
And second receiving means for receiving the individual data when the code of the individual data matches the unique code.

[0008] According to a second aspect of the present invention, there is provided a digital broadcasting system for transmitting an additional means for adding a code to each of the common data and the individual data, and transmitting the common data to which the code is added and one or more individual data to which the code is added. Digital broadcast receiver including transmitting means, storage means for storing a unique code, first receiving means for receiving common data, comparing means for comparing the code of the individual data with the unique code, and the code of the individual data And a second receiving means for receiving the individual data when the unique code matches with the unique code.

A digital broadcasting system according to a third aspect is the digital broadcasting system according to the second aspect, wherein the common data and the individual data are news data.

According to a fourth aspect of the present invention, there is provided a digital broadcasting system according to the second or third aspect, wherein the common data is nationwide common data and the individual data is regional data.

A digital broadcasting system according to a fifth aspect is the digital broadcasting system according to any one of the second to fourth aspects, wherein the code added to the individual data is a postal code.

In the digital broadcasting system according to the present invention, after the code is added to the common data and the individual data by the adding means of the digital broadcasting transmitter,
The transmitting means sequentially transmits the common data and one or more individual data. The common data and the individual data are, for example, news data (claim 3). For example, the common data is nationwide common data, and the individual data is regional data (claim 4).

Then, in the digital broadcast receiver according to the first aspect, after the common data is received by the first receiving means, the unique code stored in the storage means and the code of the transmitted individual data are stored in the storage means. Are compared by the comparing means, and if the codes match, the individual data is received by the second receiving means. Such processing is performed for each digital broadcast receiver.

Therefore, from the digital broadcast transmitter,
By simply transmitting each individual data together with one common data, each digital broadcast receiver receives the common data and selectively receives the individual data having the same code as its own unique code.

[0015]

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

The digital broadcast system of the present invention includes a digital broadcast transmitter 10a shown in FIG. 1 and a digital broadcast receiver 10b shown in FIG.

The digital broadcast transmitter 10a is installed in a broadcasting station (not shown), and digitizes a video and compresses the data to obtain encoded data.
It includes a voice coding device 14 for digitizing voice and then compressing the data to obtain coded data, and an additional information coding device 16 for coding additional information to obtain coded data. The additional information includes data such as news data, key data necessary for descrambling, program information, and the like.

Here, if the data included in the additional information is news data transmitted to, for example, region 1 and region 2, the data format is common to the whole country as shown in FIG. Nationwide common data, regional data 1 as information for region 1, regional data 2 as information for region 2, and code = 0, code = postal code 1, code = postal code 2 added to respective headers Will be included.

In the additional information encoding device 16, a code = 0, a code = postal code 1, and a code = postal code 2 are added to respective header portions of the nationwide common data, the regional data 1 and the regional data 2. As described above, by adding the code for the area to the area data, the area data is extracted only by the digital broadcast receiver 10b to which the area data is to be sent. Further, in the additional information encoding device 16, a private section header according to the MPEG standard is added to each news data.

Video encoding device 12, audio encoding device 14
The coded data obtained by the additional information coding device 16 is formed into TS packets by the multiplexing device 18 in accordance with the MPEG standard and multiplexed.

The multiplexed signal obtained by the multiplexing device 18 is modulated by the modulation device 20 and transmitted from the transmitting / receiving antenna 22.

The transmitted digital satellite broadcast signal is received by a receiving antenna 24 installed in each home as shown in FIG. 2 via a communication satellite (not shown), for example, and transmitted to a digital broadcast receiver 10b. Supplied.

The digital broadcast receiving apparatus 10b is connected to a digital broadcast transmitter 10a on the broadcast station side via a telephone line (not shown).

The digital broadcast receiver 10b includes:
The IC card 26 is inserted. In the IC card 26,
Data and programs as shown in FIG. 4 are written. The data includes an ID number given to the viewer, channel contract information on the viewer's contract channel, program information on guide information of currently broadcasted programs and future broadcasted programs, and PPV on viewers' program purchase records. (Pay Per View) Purchase information, maximum viewing amount, center phone number indicating media center phone number, zip code of viewer's address, uplink information, key data for descrambling, etc. Includes encryption / decryption software for generating a key for descrambling and the like, and communication software for communication between the digital broadcast transmitter 10a and the digital broadcast receiver 10b. By using, as the unique code, a code that can specify a region, such as a postal code, stored in the IC card 26, a region-limited service becomes possible.

Returning to FIG. 2, the digital broadcast receiver 10
b includes a tuner 28, and the digital satellite broadcast signal received by the receiving antenna 24 is first transmitted to the tuner 28.
Are subjected to switching of a receiving transponder, demodulation, decoding of error correction, and the like, and the resulting stream is supplied to a transport stream processing circuit 32 via a descrambling circuit 30.

The descrambling circuit 30 includes the IC card 2
The descrambling is performed using the descrambling key data supplied from 6. The transport stream processing circuit 32 receives the program specification information based on the viewer's channel selection operation, and outputs necessary video data, audio data, and nationwide common data as shown in FIG. Extract news data including all regional data.

The extracted video data is supplied to a video decoding circuit 34, which converts the video data into uncompressed video data.
The signal is converted into an NTSC signal by an NTSC conversion circuit 36 and output to a TV receiver 38. The extracted audio data is supplied to an audio decoding circuit 40, converted into audio data before compression, converted into an analog signal by a DA conversion circuit 42, and output to a TV receiver 38.

The extracted news data is stored in the memory 44. The control CPU 46 extracts nationwide common data and local data corresponding to the digital broadcast receiver 10b from the news data by an operation described later, and combines the data. The synthesized news data is stored in the memory 44.

When a news display command is given by a viewer's operation of a remote controller (hereinafter referred to as a remote controller) 48, for example, news data stored in the memory 44 (national common data extracted by the control Data) is a video decoding circuit 3
4 are supplied. Then, the OS from the control CPU 46
In response to the instruction to execute the D (on screen display) function, the video decoding circuit 34 combines the news data with the video data or supplies it to the NTSC conversion circuit 36 alone.
The news data is converted into NT data by the NTSC conversion circuit 36.
It is converted to an SC signal and output to the TV receiver 38, where news is displayed.

If the TV receiver 38 not only displays news but also displays video and outputs sound at the same time, a more effective information service can be provided.

The digital broadcast receiver 10b includes:
A user interface circuit 50 for inputting and outputting data to and from the remote controller 48 is provided, and receives an infrared remote control signal from the remote controller 48.

A program for controlling the operation of each circuit described above is stored in the memory 44. Based on this program, the control CPU 46 controls the operation of each circuit, data read / write to the IC card 26, and the like.

The main operation of such a digital broadcasting system will be described with reference to FIG.

News data as shown in FIG. 3 is transmitted from the digital broadcast transmitter 10a, and all the news data are transmitted together with the code together with the digital broadcast receiver 10a.
When stored in the memory 44b, the control CPU 46 reads out the nationwide common data of code = 0 (step S1), and determines whether or not the reading of the nationwide common data is completed (step S3). . If the reading of the nationwide common data is not completed, this processing is continued until the reading is completed. If the reading is completed, i = 1 is set (step S5), and the local data i (first Is read i = 1) (step S7). Then, the control CPU 46 filters the area data i, and determines whether or not the postal code in the IC card 26 is the code of the area data i (step S9). If the postal code in the IC card 26 is not the code of the area data i, the reading of the area data i is stopped, and i = i + 1 is set (step S1).
1) Return to step S7.

On the other hand, in step S9, if the postal code in the IC card 26 is the code of the area data i, the control CPU 46 combines the nationwide common data and the area data i (step S13), and synthesizes. The nationwide common data and the local data i are stored in the memory 44, and the processing ends.

Thereafter, for example, when the viewer gives a news display command by operating the remote controller 48, the news data stored in the memory 44 is provided to the NTSC conversion circuit 36 via the video decoding circuit 34 in response to the command. , NTSC signals, and the TV receiver 38
And the news is displayed.

By such processing, each digital broadcast receiver 10b receives the nationwide common data and also receives the local data for its own area, and converts the nationwide information and the information for its own area. The included news can be displayed on the TV receiver 38.

According to this digital broadcasting system, when transmitting news data, it is only necessary to transmit one nationwide common data and each regional data, so that the nationwide common data is added to each region as in the conventional case. In comparison with the case where all data is transmitted, there is no need to duplicately transmit data of the common part in the whole country, and the amount of data to be transmitted can be reduced. In addition, even if the amount of data to be transmitted is small, each digital broadcast receiver 10b can receive nationwide common data and local data corresponding to itself, enabling news broadcasting corresponding to each region, and using digital newspapers by digital broadcasting. Promotion can be aimed at.

In the above embodiment, the postal code is used as the code added to the area data. However, the present invention is not limited to this, and an area code of a telephone number corresponding to each area may be used. In this case, a plurality of area codes can be added to each region data according to the range of the region,
The IC card 26 may store the area code of the telephone number of the viewer's home. At this time, each digital broadcast receiver 10b determines the code of the received news data, and divides the local data having the code common to the national common data and the area code of the home telephone number stored in the IC card 26 in advance. , And the desired news is displayed on the TV receiver 38.

In the above-described embodiment, news data is applied as data. However, the present invention is not limited to this, and any other data can be applied.

The common data and the individual data are not limited to the national common data and the regional data, respectively, and any other data can be applied.

Further, an ID number may be used as a code. In this case, an information service for transmitting common data for all viewers and individual data for each viewer to each viewer is provided. The invention can be applied.

If the ID number of the specific group is used as the code, an information service for transmitting common data for all viewers and individual data for the viewers belonging to the specific group to the viewers belonging to the specific group. The present invention can be applied to the following.

The present invention is applicable not only to CS broadcasting but also to BS broadcasting.
The present invention can be applied to (broadcasting satellite) broadcasting, cable broadcasting waves, terrestrial broadcasting, and the like.

[0045]

According to the present invention, each digital broadcast receiver can receive the common data and the individual data corresponding to itself only by transmitting one common data and each individual data. Necessary data can be received even if the data amount is small.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital broadcast transmitter according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a digital broadcast receiver according to one embodiment of the present invention.

FIG. 3 is an illustrative view showing one example of a data format of news data;

FIG. 4 is an illustrative view showing information stored in an IC card;

FIG. 5 is a flowchart showing an example of a main operation of the present invention.

FIG. 6 is an illustrative view showing a data format of news data in the related art.

[Explanation of symbols]

 10a Digital Broadcasting Transmitter 10b Digital Broadcasting Receiver 16 Additional Information Encoding Device 18 Multiplexer 26 IC Card 44 Memory 46 Control CPU

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 7/20 (72) Inventor Isao Tsukane 2-5-5-1 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. ( 72) Inventor Koji Tanaka 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A digital broadcast receiver for receiving common data and individual data each having a code added thereto, a storage unit for storing a unique code, a first receiving unit for receiving the common data, the individual data A digital broadcast receiver, comprising: comparison means for comparing the unique code with the unique code; and second receiving means for receiving the individual data when the code of the individual data matches the unique code. 2. A digital broadcast comprising: an adding unit that adds a code to each of common data and individual data; and a transmitting unit that transmits the common data to which a code is added and one or more individual data to which a code is added. A receiver, storage means for storing a unique code, first receiving means for receiving the common data, comparison means for comparing the code of the individual data with the unique code, and a code for the individual data and the unique code. And a second receiving means for receiving the individual data when the codes match with each other. 3. The digital broadcasting system according to claim 2, wherein said common data and said individual data are news data. 4. The digital broadcasting system according to claim 2, wherein said common data is nationwide common data, and said individual data is regional data. 5. The digital broadcasting system according to claim 2, wherein the code added to the individual data is a postal code.