JP2004072348A - Data broadcasting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system capable of realizing a new data broadcasting service cooperation method effective for the easiness of station management. <P>SOLUTION: Data broadcasting sending equipment 201 in the broadcasting station concerned informs which is made effective for data broadcasting contents in displaying, a net CM start event message in a net event message ES 304 sent from another station or a local CM start event message including in a local event message ES sent from its own station, by sending a net CM interrupting event message immediately before replacing CM contents. When the net CM start event message transmitted from the other station and the local CM start event message transmitted from its own station are received, a module of the other station is displayed, a module of its own station is displayed, or non-display of modules is set. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data broadcasting system.
[0002]
[Prior art]
In recent years, in the television broadcasting industry, digital broadcasting has already been put to practical use in BS (broadcasting satellite broadcasting) and CS (communication satellite broadcasting), etc. Preparation is in progress.
To briefly explain the difference between BS / CS and terrestrial broadcasting, BS / CS broadcasts programs nationwide from a certain point using artificial satellites, whereas terrestrial broadcasting usually uses uniform programs nationwide. Local unique programs are mixed and broadcast. In order to realize this mixed system, a plurality of broadcasting stations form a broadcasting network centered on a main station called a key station and mutually supply programs, and the programs are transmitted from the key station to the broadcasting network. In addition to the key stations, stations other than the key stations mix their own programs and programs from the network according to the time schedule and broadcast them as their own programs (hereinafter, this method is referred to as net distribution). Do).
[0003]
Up to now, in addition to the conventional moving image and audio broadcasting, a new data broadcasting service has been started by BS digital. In the data broadcasting service as well, the start of digital terrestrial broadcasting requires the above-described network distribution, but a new mechanism is required for the distribution method.
Conventionally, there has been proposed a method in which data broadcasting content created at a key station is transmitted to another station in advance via a content distribution network, and the other station broadcasts using the data broadcasting content. I have.
[0004]
Here, there are various data formats of the data broadcasting program. In the following, an example based on a digital broadcasting system defined by ARIB (Association of Radio Industries and Businesses) as a standard will be described with reference to the drawings. explain.
FIG. 5 is a diagram for explaining a conventional data broadcasting service cooperation method. The link service of the data broadcasting service is performed between the first broadcasting station 1000 which is a key station and the second broadcasting station 2000 which is another station (local broadcasting station located in each region).
[0005]
First, the first broadcast station 1000 will be described. Data broadcast program content 1050 is output from the data broadcast production facility 1001. The data broadcast program content is a set of all data broadcast program parts necessary for creating a program of one data broadcast service, and the update time and update contents of data in the program are also defined. The data broadcast transmission device 1002 converts the input data broadcast content 1050 into an MPEG-2 transport stream (TS) and outputs a data broadcast program TS1051. The video / audio transmission device 1005 outputs the video / audio program TS1052 converted into the MPEG-2 transport stream. The multiplexing device 1003 multiplexes the input data broadcast program TS1051 and video / audio program TS1052, and outputs a program TS1053 to be a television program. The broadcast wave transmission equipment 1004 converts the input program TS 1053 into a broadcast wave 1054. Finally, the broadcast radio wave 1054 is broadcast through the broadcast antenna 1006. A broadcast wave 1054 is received at the viewer's home 1010 through the reception antenna 1011, and a broadcast is projected by the television receiver 1012.
[0006]
Next, the second broadcast station 2000 will be described. The content management server 2061 receives the data broadcast program content transmitted from the first broadcast station 1000, and transmits the data broadcast program content 2050 to the data broadcast transmitting device 2002 when the broadcast time comes. Data broadcast program TS2051, video / audio transmission facility 2005, video / audio program TS2052, multiplexing device 2003, program TS2053, broadcast wave transmission facility 2004, broadcast radio wave 2054, broadcast antenna 2006, viewer home 2010, receiver antenna 2011 at viewer home , The television receiver 2012 performs the same operation as that of the first broadcasting station 1000 and the viewer's house.
[0007]
The content distribution network 2081 is for distributing data broadcast program contents created by the data broadcast production facility 1001 in the first broadcast station to other broadcast stations, The data broadcast program content created by the production facility 1001 enters the content distribution network 2081 via the first line 2082, and is stored in the content management server 2061 of the second broadcast station via the second line 2083 from there. Then, transmission processing is performed as a data broadcasting service of the second broadcasting station.
[0008]
The timing distribution network 2084 distributes timing information such as an event message created by the data broadcast transmission equipment 1002 in the first broadcast station to other broadcast stations, and transmits the data of the first broadcast station 1000 The timing information generated by the broadcast transmission equipment 1002 enters the timing distribution network 2084 via the third line 2085, and is transmitted therefrom to the data broadcast transmission equipment 2002 of the second broadcast station via the fourth line 2086. And is used for notification of the actual broadcast timing.
[0009]
Here, a method of controlling programs and CM in the data broadcasting service will be briefly described.
FIG. 6 shows a configuration of a program output from each broadcasting station. The left side shows a configuration of a program output from the first broadcasting station 1000, and the right side shows a configuration of a program output from the second broadcasting station 2000. Represents. These correspond to the program TSs 1053 and 2053 in FIG. 5, respectively, and are composed of encoded video, audio, and data packet sequences called elementary streams (hereinafter referred to as ESs) indicated by bold lines in the drawing. Have been.
[0010]
In the configuration of the program broadcast from the first broadcast station (TS1053) on the left side of FIG. 6, the video ES 3001 and the audio ES 3002 are ESs that transmit video and audio broadcasts, respectively. The data carousel ES3003 and the event message ES3004 are both ESs for transmitting data broadcasting, the data carousel ES3003 is for transmitting content used for a data broadcasting service, and the event message ES3004 is used for a data broadcasting service. This is an ES for sending a signal called an event message to give a trigger (event) to the content to be played.
[0011]
It is assumed that the video ES, the audio ES, and the data carousel ES are flowing from time t0 to time t3. First, a CM acquisition event message is sent at least once at any time from time t0 to time t1 in the event message ES. At this time, when the CM broadcast event message is received on the content side of the data broadcast, the CM data of Company A is acquired and stored in the memory of the receiver. Then, a CM start event message is sent at the timing of time t1. At this time, when the CM start event message is received on the content side of the data broadcast, the CM of Company A is displayed, and the display returns to its original state after a certain time has elapsed.
[0012]
The actual operation of the television receiver at this time will be described. From time t0 to time t1, the video and audio of the program and the data related to the program are displayed on the television receiver. Then, the commercial starts at the timing of the time t1, and from the time t1 to the time t2, the video relating to the commercial of the company A and the data relating to the commercial are displayed. Then, from time t2 to time t3, the video and audio of the program and the data related to the program are displayed again.
[0013]
In the second broadcasting station 2000, information necessary for the data broadcasting service is obtained in advance from the first broadcasting station 1000 through the content distribution network and the timing distribution network, and a part of the information is changed to the own station. Thereby, the same data broadcasting service as that of the first broadcasting station can be provided.
[0014]
[Problems to be solved by the invention]
As described above, in the conventional example, even when performing the same data broadcast in the first broadcast station and the second broadcast station, it is necessary to separately manage the content in each broadcast station, and the cost for that is large. This is a problem for station management.
The present invention has been made in view of such a problem, and has an effect of facilitating station management in another station in a system for linking data broadcasting from a key station to another station via a network. It is an object of the present invention to provide a system for realizing a new method of linking data broadcasting services.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a data broadcasting system that performs data broadcasting, a first broadcasting device, a second broadcasting device, and a receiver, wherein the first broadcasting device is A first data transmitting unit that broadcasts program content including broadcast data and a display message indicating the timing of displaying the broadcast data to a receiver, and distributes the broadcast content to a second broadcast device via a network. The second broadcast device includes a receiving unit for receiving the program content, a received program content, and a program content including a display blocking message notifying that a display operation corresponding to the display message is to be blocked to a receiver. Second data transmitting means for broadcasting to the receiver, the receiver, after detecting the display blocking message, when detecting the display message , And having a function of blocking the operation of displaying the timing showing a broadcast data corresponding display message.
[0016]
According to the above configuration, when decoding and processing the data broadcast content in the receiver, the network content control event message transmitted by another station to display the module can be invalidated, or the own station can display the module. Or the local content control event message transmitted to the server. As a result, without changing the data broadcast distributed from the key station to the local station at all, the display contents of the data broadcast of the net program at the local station can be changed for the local program, or the display of the data broadcast itself can be prevented. Or it becomes possible. As described above, since the display of the data broadcast of the key station can be controlled without changing the contents of the data broadcast distributed from the key station to the local station at all, even if the local station performs its own data broadcast, the station can perform its own broadcast. Operation can be facilitated.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention provides a system in which a data broadcasting program TS created by a certain broadcasting station is distributed to another broadcasting station via a network, and the broadcasting station receiving the network broadcasts the data broadcasting program TS from the own station. By transmitting a control signal separately from the data broadcasting transmission equipment, the data broadcasting program TS distributed from the net is displayed as a display of the receiver as seen by the viewer without any change to the data broadcasting program TS distributed over the network. Obtaining effects such as CM replacement by hiding the display of an arbitrary data broadcast module at an arbitrary timing and additionally displaying the module in the data broadcast program TS output from the data broadcast transmission equipment of the own station Is a system that enables
[0018]
Hereinafter, embodiments will be described.
FIG. 1 is a diagram for explaining a basic configuration of an embodiment in a data broadcasting system of the present invention.
In FIG. 1, reference numeral 100 denotes the entire broadcasting facility of the first broadcasting station, and the components and functions thereof are the same as those of the related art, so that the description is omitted here.
[0019]
Next, the second broadcast station 200 will be described. The data broadcast production facility 201 outputs the data broadcast program content 250. The data broadcast transmission facility 202 converts the input data broadcast content 250 into an MPEG-2 transport stream and outputs a data broadcast program TS251. The video / audio transmission facility 205 outputs the video / audio program TS252 converted into the MPEG-2 transport stream. The multiplexing device 203 includes a data broadcasting program TS151 of the first broadcasting station output from the data broadcasting transmitting equipment 102 in the first broadcasting station and transmitted through the network line 156, and a data broadcasting transmitting equipment 202 of the second broadcasting station. Then, the data broadcasting program TS251 and the video / audio program TS252 of the second broadcasting station output from the multiplexing unit are multiplexed, and a program TS253 to be a television program is output. The broadcast wave transmission equipment 204 converts the input program TS 253 into a broadcast wave 254. Finally, the broadcast wave 254 is broadcast through the broadcast antenna 206. At the viewer's home 210, the broadcast radio wave 254 is received through the receiving antenna 211 of the viewer's home, and the broadcast is projected by the television receiver 212.
[0020]
Here, a data broadcast in the embodiment of the present invention will be described. FIG. 2 shows a configuration of a program output from each broadcasting station in the embodiment of the present invention. The left side shows the configuration of a program output from the first broadcasting station, and the right side shows the configuration output from the second broadcasting station. Shows the program configuration. The structure of the program output from the first broadcast station is the same as that of the related art, and therefore detailed description thereof is omitted here. However, the net data carousel ES303 includes the main program information and CM of the data broadcast program. Modules (data modules for characters and images displayed in the form of a telop at the receiver) are included, and the main program information and the CM module are assumed to be viewed by viewers nationwide. In this example, the receiver that receives the data broadcast of the first broadcast station presents a data broadcast service for nationwide broadcasting with both the main information and the CM of the data broadcast program.
[0021]
In FIG. 2, the right side shows a program configuration output from the second broadcast station, which corresponds to the program TS 253 in FIG. 1 and has already been encoded and called an ES called a thick line in the figure. It is composed of a packet sequence of video, audio, and data. In the configuration of the program broadcast from the second broadcast station (TS253), the video ES 401 and the audio ES 402 are ESs that transmit video and audio broadcasts, respectively. In this example, the video and audio used are those output from the video and audio transmission equipment of the second broadcasting station. Good. Net data carousel ES303 and net event message ES304 These are ESs for transmitting data broadcasting, and include main information of data broadcasting programs, CM modules, and various event messages. These are sent as a data broadcast program TS151 from the first broadcast station through a network for national broadcasting, and are composed of the same modules and event messages as the data broadcast contents of the first broadcast station. I have.
[0022]
Further, the local data carousel ES501 and the local event message ES502 are these ESs for transmitting data broadcasting, and the data broadcasting program TS251 of the second broadcasting station output from the data transmission equipment of the second broadcasting station. Is a constituent element.
The local data carousel ES501 includes a CM module for the second broadcast station. The CM module for the second broadcast station is a component that constitutes the data broadcast CM content of the program, and is assumed to be viewed only by the viewer who directly receives the broadcast of the second broadcast station. The content of the ES of the first main program for broadcast station and the CM data may not be the same.
[0023]
The local event message ES502 includes a net CM blocking event message and a second broadcast station as shown in FIGS. 2 and 3 (a diagram showing the time relationship between each event message included in the local event message). A local CM acquisition event message and a local CM start event message which trigger data presentation control are included. As the net CM blocking event message, which of the net CM start event message and the local CM start event message sent out by the net event message ES304 (for the whole country) and the local event message ES502 (for the second broadcast station) is valid. This is trigger information for notifying the receiver of whether or not the CM start event message is transmitted, as shown in FIG.
[0024]
The data broadcast content composed of the net data carousel ES303 and the net event message ES304, and the local data carousel ES501 and the local event message ES502 is scripted according to the ARIB standard so that the receiver performs the following operations. It is described as a function definition in a language (for example, BML). Explaining the outline of the description, the message includes a unique identifier (ID) and definition information that defines the operation instruction content. Further, the net data carousel includes a display control program to be executed when a predetermined message is received. This program executes a control to be executed when each message (MSG) is received. And its display) are defined as a function (f (MSG)) in association with each message.
[0025]
Referring to FIG. 3, a display control program and a transmission time zone of each event will be described. A message ID is assigned to each event message, and the display control program for executing the display control of the CM module includes the content of the net data carousel. One of them is transmitted before or synchronously with the transmission of the net CM blocking event message. The display control program causes the receiver to monitor the transmission of each event message as indicated by the arrow in the figure, and executes the function defined in correspondence with the acquired event ID to execute the following. Performs such an operation.
[0026]
FIG. 4 is a flowchart illustrating an operation in the receiver.
As shown in this figure, when the receiver receives the net data carousel ES303 (Y in step S1), both the net event message ES304 and the local event message ES502 are always transmitted according to the description of the program data content included in the ES303. Monitoring is performed (step S2). When the net CM acquisition event message is sent in the net event message ES304 (Y in step S3), the net CM program described in the content in the net data carousel ES303 is executed, and the net data carousel ES303 is executed. Is stored in the memory of the receiver (step S4). Thereafter, when the net CM start event message is sent (Y in step S5), and when the net CM blocking event message is not sent (N in step S7), the net CM start event message is described in the contents in the net data carousel ES303. The net CM program is executed, and the contents of the CM module of the net data carousel ES303 are displayed on the screen (Step S6; in this example, the CM of Company A on the left in FIG. 2).
[0027]
Here, when the net CM blocking event message is sent in the local event message ES502 during a certain period before sending the net CM start event message (Y in step S7), the receiver sets the description of the content in the net data carousel ES. , The operation of displaying the nationwide CM data corresponding to the net CM start event message is not performed. As such a method, there is a method of setting such that the net CM start event message is invalidated and ignored when the message is sent. For example, if a display control program is described in a script language, and a function to be executed when a net CM start event message is received is f (net CM start event message), when a net CM blocking event message is received, f ′ (net CM blocking event message) can be defined as a function that does not execute f (net CM start event message) (such as a function that replaces a function that executes another display process). As a result, the operation of displaying the net CM module in step S6 is not performed.
[0028]
Then, the following operation is performed instead of the operation of hiding the net CM module. When the local CM acquisition event message is sent in the local event message ES502 (Y in step S8), the local CM program described in the contents in the net data carousel ES303 is executed, and the local data carousel ES501 is executed. Is stored in the memory of the receiver (step S9). Thereafter, when a local CM start event message is sent in the local event message ES502 (Y9 in step S10), the receiver executes the local CM program described in the content in the net data carousel ES303, and executes the local CM. The contents of the CM module of the data carousel ES501 are displayed on the screen (Step S11; in this example, the CM of Company B on the right in FIG. 2). The operation control program for displaying the local CM module instead of receiving the net CM blocking event message includes the f ′ (net CM blocking event function) defined as a function that does not execute the f (net CM start event message). Event message) can be defined as a function that performs storage operation of the local CM module when the local CM acquisition event message is received and display operation when the local CM start event message is received as described above.
[0029]
As a result, as shown in the right side of FIG. 2, the receiver watching the program broadcasted from the second broadcast station, despite the fact that the CM data of Company A is flowing from the net, is receiving the second broadcast. The CM data of Company B transmitted by the station is displayed, and the CM data is replaced.
Next, when a net CM blocking event message is sent in the local event message ES502 for a certain period before the sending of the net CM start event message, a national CM corresponding to any event message among the plurality of sent net CM start event messages is sent. A description will be given as to whether or not to perform the operation of displaying the CM module. Although several methods are conceivable, a representative example and the following method are given.
[0030]
First, an operation corresponding to a net CM start event message detected within a predetermined time (for example, 3 seconds) from when a net CM blocking event message is first detected within a certain period to when the next CM broadcast starts. Is executed.
Next, the net CM blocking message and the net CM start event message are associated with one-to-one or one-to-many by a unique ID of the message, and an operation corresponding to the corresponding net CM start event message is executed. There is a method to avoid this.
[0031]
Further, there is a method of not performing an operation corresponding to the first detected net CM start event message within a predetermined time from when the net CM blocking event message is detected until the next CM broadcast is started.
In any of these cases, the net CM blocking event message is continuously transmitted as shown in FIGS. 2 and 3 in consideration of the fact that the time at which the viewer starts viewing varies from viewer to viewer. It is desirable.
[0032]
<Others>
The present invention is not limited to the above description, and the following modified examples are also conceivable.
(1) Only the net CM blocking event message may be transmitted without transmitting the local CM acquisition event message and the local CM start event message of the local data carousel ES501. In that case, the CM module is not displayed, and only the video and audio are displayed.
[0033]
(2) The transmission of the net CM acquisition event message, the net CM start event message, the local CM acquisition event message, the local CM start event message, and the net CM rejection event message may be separately transmitted to different ESs.
(3) The transmission timing of the local CM acquisition event message and the net CM blocking event message can be synchronized, and the same effect can be obtained with either one.
[0034]
(4) In the above example, the replacement has been described using CM data as an example, but this may be main program information.
(5) Although the local data carousel ES501 and the local event message ES502, which are data for the second broadcast station, are generated by the second broadcast station in this example, the second broadcast station broadcasts the data. The content generated by the first broadcast station may be distributed via the Internet and broadcast by the second broadcast station.
[0035]
(6) The program that does not perform the display processing of the net CM module when the net CM blocking event message is received may be any program that performs this operation. .
(7) The local data carousel and the local net carousel may be produced and broadcast by the second broadcast station which is a local station, or may be exclusively used as produced by the first broadcast station which is a key station. The information may be distributed to the second broadcasting station via a line and broadcast.
[0036]
【The invention's effect】
As described above, the present invention is a data broadcasting system that performs data broadcasting, includes a first broadcasting device, a second broadcasting device, and a receiver, wherein the first broadcasting device has broadcast data and And a first data transmission means for broadcasting a program content including a display message notifying a timing of displaying broadcast data to a receiver, and distributing the broadcast content to a second broadcast device via a network. The broadcast device broadcasts to a receiver a receiving means for receiving the program content, a received program content, and a program content including a display blocking message notifying that a display operation corresponding to the display message is to be blocked. And second data transmission means for performing
When the receiver detects the display message after detecting the display blocking message, the receiver has a function of blocking an operation of displaying broadcast data at a timing indicated by the display message.
[0037]
According to the above configuration, when decoding and processing the data broadcast content in the receiver, the network content control event message transmitted by another station to display the module can be invalidated, or the own station can display the module. Or the local content control event message transmitted to the server. As a result, without changing the data broadcast distributed from the key station to the local station at all, the display contents of the data broadcast of the net program at the local station can be changed for the local program or the display of the data broadcast itself can be prevented Or it becomes possible. In this way, the display control of the data broadcast of the key station can be performed without changing the data broadcast distributed from the key station to the local station at all. It will be easy
In addition, since a replacement device is not required, a cost advantage can be expected by reducing equipment.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.
FIG. 2 is a diagram showing a configuration of a program of a broadcasting station according to the embodiment of the present invention.
FIG. 3 is a diagram showing a time relationship in which each event message is transmitted.
FIG. 4 is a flowchart illustrating an operation in the receiver.
FIG. 5 is a block diagram showing a system configuration of a conventional example.
FIG. 6 is a diagram showing a configuration of a program of a broadcasting station in a conventional example.
[Explanation of symbols]
100 First Broadcasting Station
101 Data Broadcast Production Equipment
102 Data broadcasting transmission equipment
103 Multiplexer
104 Broadcast wave transmission equipment
105 Video / audio transmission equipment
106 Broadcast antenna
110 viewers' home
111 receiving antenna
112 TV receiver
150 Data broadcast program contents
151 Data Broadcasting Program TS
152 video / audio program TS
153 Program TS
154 broadcast wave
156 network line
200 Second Broadcasting Station
201 Data Broadcast Production Equipment
202 Data broadcasting transmission equipment
203 Multiplexer
204 Broadcast wave transmission equipment
205 Video / audio transmission equipment
206 broadcast antenna
210 Audience home
211 receiving antenna
212 TV receiver
250 data broadcasting program contents
251 Data Broadcasting Program TS
252 video / audio program TS
253 Program TS
254 broadcast wave
301 Video ES
302 Voice ES
303 Data Carousel ES
304 Event Message ES
401 Video ES
402 Voice ES
501 Local Data Carousel ES
502 Local event message ES

Claims (7)

A data broadcasting system comprising a first broadcasting device, a second broadcasting device, and a receiver for performing data broadcasting,
The first broadcast device is
A first data transmitting unit that broadcasts program content including broadcast data and a display message indicating the timing of displaying the broadcast data to a receiver, and distributes the broadcast content to a second broadcast device via a network. ,
The second broadcasting device is
Receiving means for receiving the program content;
A second data transmitting means for broadcasting the received program content and a program content including a display blocking message notifying that a display operation corresponding to the display message is blocked to a receiver,
A data broadcasting system having a function of, when the receiver detects the display message after detecting the display blocking message, blocking an operation of displaying broadcast data at a timing indicated by the display message. The program content transmitted by the first data transmitting means is a display control program executable by a receiver for controlling the display of broadcast data. When a display message is received, the program is broadcast at a timing indicated by the message. The data broadcast system according to claim 1, further comprising a program for displaying data, wherein the function of preventing the receiver from displaying broadcast data is realized by executing the display control program. The display control program causes the receiver to monitor the display blocking message and the display message, and the receiver detects the display message within a predetermined time from the time when the display blocking message is detected. 3. The data broadcasting system according to claim 2, wherein a display operation that should be performed is not performed at a timing indicated by the display message. The display control program causes a receiver to monitor the display blocking message and the display message. When the receiver detects the display blocking message, the receiver is associated with the detected display blocking message in advance. 3. The data broadcast system according to claim 2, wherein when a display message is detected, a display operation that should be performed is not performed at a timing indicated by the display message. The display control program causes a receiver to monitor the display blocking message and the display message. When the receiver detects the display blocking message, the receiver indicates a timing indicated by the first detected display message thereafter. 3. The data broadcasting system according to claim 2, wherein a display operation that should be performed is not performed. A key broadcast device via a network for transmitting program contents including broadcast data, a display control program for controlling display of the broadcast data executable by a receiver, and a display message notifying a timing of displaying the broadcast data. A local broadcast device for receiving from
Broadcast to a receiver the received program content and a program content including a display blocking message that informs the display control program to block the display operation corresponding to the display message,
The display control program, in the receiver, after detecting the display blocking message, when detecting the display message, receives a function of preventing an operation of displaying broadcast data at a timing indicated by the display message on the receiver. A local broadcast device, which is executed by a broadcaster. Broadcast data,
A display control program for controlling display of the broadcast data executable by a receiver, and a display message notifying a timing of displaying the broadcast data,
To the local broadcasting device via the network,
The display control program includes:
At the receiver,
After detecting the display blocking message that informs the display control program that the display operation corresponding to the display message sent from the local station is blocked, when the display message is detected,
A key broadcast device for causing a receiver to execute a function of preventing an operation of displaying broadcast data at a timing indicated by the display message on the receiver.

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