JP3204409B2 - Selective broadcast method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for selectively transmitting a large amount of information, such as still image information and moving image information, to a large number of communication partners via the same broadcast-type broadcast communication channel. The present invention relates to a selective broadcasting method and apparatus for improving the efficiency of a communication channel by transmitting capacity information and selective control information.

[0002]

2. Description of the Related Art For example, when it is desired to transmit a large amount of still image information to a large number of communication parties at night or the like, it is not a simple broadcast communication. In the method, different information has to be transmitted on a one-to-one basis depending on the destination. FIG. 4 is a configuration diagram of a conventional selective broadcast communication device. In FIG.
1 is a storage device that stores target information 11 such as a large number of still images and moving images, 2 is a center control device that reads information stored in the storage device 1 and transmits it to the one-to-one communication path 3. 4 is a plurality of information receiving devices, here CR
This is a workstation with a T screen. The center control device 2 retrieves image information and the like requested by each information receiving device 4 from the storage device 1 and transmits the information individually to each information receiving device 4 via the one-to-one communication path 3 to select the information. Broadcast.

[0003]

However, the problem with the conventional selective broadcast communication is that, as shown in FIG. 4, in order to selectively transmit information, a destination corresponding to each information is transmitted. It is necessary to repeat transmission one-to-one according to the list. Therefore, when the number of transmission destinations is relatively small or when the amount of each information is small, there is not much problem even if transmission is performed by such a conventional method. But,
When a large amount of information is transmitted on a nationwide scale or the like, according to the conventional method, the practical use efficiency of the communication path is extremely deteriorated. There is also a problem that it takes a long time to complete transmission to all transmission destinations since transmission is repeated sequentially. SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem and to reduce the total communication amount even when transmission information is different for each reception destination and a large amount of information is to be transmitted to a large number of communication partners. At the same time, it is an object of the present invention to provide a selective broadcast communication method and apparatus capable of reducing communication time.

[0004]

To achieve the above object, according to an aspect of, (i) selective broadcasting method of the present invention, via a broadcast channel of the broadcast type (5), the center control device (2) And a plurality of receiving devices (4), wherein the center control device (2) specifies target information desired to be received from the plurality of receiving devices (4). , And generates compressed selective control information (see FIG. 3) corresponding to the identifiers of the plurality of receiving devices (4), and sends out the selected selective control information along with the target information to a broadcast-type broadcast channel (5). An information receiving device (4) receives the compressed selective control information and the target information transmitted from the center control device (2) via a broadcast type broadcast communication channel (5), and after extending the selective control information, selective system corresponding to the identifier of the own reception device
Target information received based on the content of the control information is selectively stored in the storage device (46). (B) The selective broadcast device of the present invention selectively transmits and receives information between the center control device (2) and the plurality of receiving devices (4) via a broadcast-type broadcast communication channel. In the selective broadcast communication device, the center control device (2) performs compression corresponding to identifiers of the plurality of receiving devices (4) based on designation of target information desired to be received from the plurality of receiving devices (4).
The selected selective control information (see FIG. 3) is created and the target information is created.
And a means for transmitting to a broadcast type broadcast communication channel (5), and each of the plurality of receiving devices (4) has its own device identification.
A device identifier storing means (44) for storing the identifier,
Receiving information storing means (46) for accumulating information, and receiving the target information and the compressed selective control information sent from the center control device (2) via the broadcast type broadcast communication channel (5).
Means (broadcasting channel control device 41) and the received compression
Means for expanding selected control information (selection information extraction
Device 42), expanded selective control information and device identification
Device using the device identifier stored in the child storage means (44).
For determining the content of the selective control information corresponding to the location identifier.
Step (comparing device 43) and the pair received based on the determination result.
Elephant information is selectively stored in the reception information storage means (46).
It is characterized by having a switching means (switching device 55) .

[0005]

According to the present invention, a large amount of information and control information for controlling selection of the information are transmitted from the center control device to the respective receiving devices via the same broadcast-type broadcast communication channel. Each information receiving device is added to the information and the information without using a selective broadcast for sequentially transmitting information to each receiving device as in the related art, and the selective control necessary for the selective reception is performed. Receiving the information and comparing the selective control information with the received selective control information for the identifier of the own receiving device stored in the receiving device in advance, and only the information corresponding to the matched selective control information. Is stored in the storage device. As a result, the communication time can be shortened at the same time as the overall communication amount is reduced. Then, since only the information requested by the receiving device can be delivered via each broadcast-type broadcast channel, the amount of communication channel used can be significantly reduced.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a selective broadcasting device according to an embodiment of the present invention. In FIG. 1, 1 is a storage device, 2 is a center control device, 4 is an information receiving device, 1
Reference numeral 1 denotes target information, which indicates the same device or information as in FIG. Also, as newly provided, reference numeral 6 denotes a broadcast-type broadcast communication device, here a satellite, and reference numeral 5 denotes a broadcast-type broadcast communication channel using the broadcast-type broadcast communication device. It is assumed that the user having each of the information receiving apparatuses 4 specifies information to be received in advance by, for example, a specifying method using a keyword or the like. The designation method may be any other method. In this way, if the user specifies the information to be received in advance, the center control device 2 converts the information selection designation information into the identifier of the target information 11 before transmitting the target information, and performs center control. It is stored in the device 2 as information selection control information 13 (not shown). Next, the center control device 2 transmits the target information 11 stored in the storage device 1 to the all information receiving device 4 via the radiation type broadcast communication channel 5.
Send to At this time, information for identifying the receiving device that should receive the information is added together with each target information 11. Specifically, a device identifier such as device 0, device 1, device 2,... Is provided, and the identifier is added to the transmitted target information. Each of the information receiving devices 4 does not always receive all of the object information 11 that is being broadcast, but holds the received information selection control information and checks the value of the cell corresponding to its own identification number. Thereby, the target information 11 to be received is selectively received.

FIG. 2 is a detailed internal configuration diagram of the information receiving apparatus in FIG. In FIG. 2, reference numeral 5 denotes a broadcast channel through which the target information 11 and the device identifier are transmitted from the center control device 2, and reference numeral 41 denotes the information selection control information 13 and the target information 11 .
The receiving channel control device 42 receives the compressed information.
A selection information extracting device for decompressing the report selection information 13 and returning it to the original information, 43 is a comparing device for comparing the identifier stored in the identifier storage device 44 with the identifier fetched from the communication path, and 44 is a device. A device identifier storage device 45 for storing identifiers is controlled by the output of the comparison device 43, and a switching device for determining whether or not to store the identifiers in the reception information storage device 46. A switching device 46 for storing the target information 11 is provided. It is a received information storage device. The information receiving device 4 receives the target information 11 and a part (column) corresponding to the target information 11 of the information selection information 13 from the center control device 2 via the broadcast communication path 5. The broadcast channel controller 41 extracts a portion of the information selection information 13 corresponding to the target information 11, and determines whether or not the group of target information 11 transmitted thereafter should be received. Therefore, the value of the cell in the information selection information 13 corresponding to the device identifier stored in the device identifier storage device 44 is determined using the comparison device 43. By controlling the switching device 45 based on the result determined by the comparison device 43, the target information 11
Is stored in the reception information storage device 46.

FIG. 3 is a diagram showing information selection control information transmitted via a broadcast communication channel. The information selection control information 13 includes a vertical information identifier (information 0, information 1, information 2,...) And a horizontal device identifier (device 0, device 1, device 2,...). Cells are provided, and control information corresponding to each cell is stored. In the value (0/1) stored in each cell in FIG. 3, 0 indicates that the information should not be received by the device, and 1 indicates that the information should be received. Therefore, when transmitting certain information (for example, information 2) via the broadcast channel 5,
.. Is added with information selection control information of 0 or 1 for each of the devices 0, 1, 2,... And the information is transmitted.

The information selection information 13 can be compressed for each information selection information corresponding to each target information 11 and only the difference between the two information selection information corresponding to successive target information 11 is transmitted. It is also possible to perform compression. The decompression of these compressed information is shown in FIG.
Can be performed by the selection information extracting device 42 shown in FIG.
For example, Modifie used in facsimile communication etc.
Existing compression method / compression LSI such as d Lead Coding
Etc. can be used. Regarding the compression of image information, see, for example, "Image Information Compression" 1991
pp. 161-171.

[0010]

As described above, according to the present invention,
There is an effect that transmission of a large amount of information to a large number of communication partners can be realized with a minimum communication capacity and a minimum communication time via a broadcast communication path.

[0011]

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a selective broadcasting device according to an embodiment of the present invention.

FIG. 2 is a detailed internal configuration diagram of the information receiving apparatus in FIG. 1;

FIG. 3 is a diagram showing selection control information passing through a broadcast communication channel in FIG. 1;

FIG. 4 is a diagram showing a configuration of a conventional selective broadcast communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage device 2 Center control device 3 One-to-one communication channel 4 Information receiving device 5 Broadcast type broadcast communication channel 13 Information selection information 41 Broadcast communication channel control device 42 Selection information extraction device 43 Comparison device 44 Device identifier storage device 45 Switching device 46 Received information storage device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-178827 (JP, A) JP-A-1-190150 (JP, A) JP-A-1-2066752 (JP, A) JP-A-3-3 62646 (JP, A) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H04L 12/28-12/44

Claims (2)

(57) [Claims] 1. A selective broadcast communication method for selectively transmitting and receiving information between a center control device and a plurality of receiving devices via a broadcast-type broadcast communication path, wherein the center control device comprises: create a compressed selective control information corresponding to the identifier of the plurality of receiving devices based on the received from the receiver to the specified desired target information, and sends the broadcast channel of the broadcast type with target information, Each of the information receiving devices receives the compressed selective control information and the target information transmitted from the center control device via the broadcast type broadcast communication path, and After decompressing the
Select the target information received based on the content of your information
Selective broadcast method characterized by storing in the storage device. 2. A selective broadcast communication device for selectively transmitting and receiving information between a center control device and a plurality of receiving devices via a broadcast-type broadcast communication path, wherein the center control device includes a plurality of the plurality of receiving devices. create a compressed selective control information corresponding to the identifier of the plurality of receiving devices based on the received from the receiver to the specified desired target information, means for transmitting the broadcast channel of the broadcast type with object information Each of the plurality of receiving devices stores the device identifier of its own device.
Device identifier storing means to store the received information
Information storage means, and the broadcast type
The target information and the pressure transmitted via the
Means for receiving the reduced selective control information;
Means for decompressing the compressed selective control information;
The selected control information and the device identifier stored in the device identifier storage means.
Selectively corresponding to the device identifier using the
Means for determining the content of the control information, based on the determination result
Selectively receive the received target information in the received information storage means
And a switching means for accumulating data in the selective broadcast communication device.