JPH0884126A - Character broadcasting system and method for controlling the system - Google Patents

Abstract

PURPOSE: To control a receiving side device in a character broadcasting system by including a device control code in a character broadcasting wave. CONSTITUTION: A device control code is added to a broadcasting wave including a character signal code for character broadcasting. The broadcasting wave is sent to a character signal decoder 30 through a receiving circuit 20. The device control code is decoded by a device control code decoding part 30a in the decoder 30 and the decoded result is applied to a device 32 through a device control circuit 31. The device 32 is controlled based upon the device control code. A bidirectional communication system can be established by transmitting a signal processed by the device 32 from the receiving side through a telephone line 52 or the like. When a storage device is connected to the device 32, received character broadcast can be stored in the storage device and then reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a character broadcasting system and a character broadcasting system control method, and more particularly to a character broadcasting system and a character broadcasting in which a device control code included in a character broadcasting wave controls a device such as a personal computer and a game machine. The present invention relates to a system control method.

[0002]

2. Description of the Related Art In text broadcasting, a part of TV radio waves is used to separate a still image by characters or figures from the TV broadcasting.
It is a broadcast that transmits synth sounds by inputting notes. By teletext, news and weather forecasts can be broadcast.

In television broadcasting, 30 still images per second are displayed on the television screen one after another to make the images appear to be moving. Each still image consists of 525 scan lines that horizontally traverse the television screen from left to right. Each still image is commonly called a frame. One frame is
Further, it is composed of two coarsely-grained images called fields each consisting of every other scanning line. A field composed of odd-numbered scan lines counted from the top is called an odd field, and a field composed of even-numbered scan lines counted from the top is called an even field. One frame is
Every other scan line is sequentially scanned from the top to project one field, and then the portion of the scan line that has been skipped in front is scanned to project another field, which is displayed on the television screen.

Although one field is made up of 262.5 scanning lines, not all 262.5 lines carry the video signal of the television. That is, no video signal is placed on the first 21 lines (return line period) of the 262.5 lines in one field. In teletext, information on characters and figures is transmitted using the scanning line in the flyback period when returning. However, because some of these 21 lines already carry the TV screen sync signal and the signals necessary for the operation of the broadcasting station, the teletext will be displayed in 4 of the other vacant scanning lines. I'm using a book. Generally, the signal transmitted by these four scanning lines is called a character signal.

A general television receiver does not include a circuit capable of receiving the above-mentioned character signal (does not process the signal in the blanking period). Therefore, in order to receive a character signal, a character signal processing circuit (hereinafter,
A "decoder") is provided for processing character signals. FIG. 1 shows the data structure of a page of character signals included in broadcast waves. A page is a unit of character signal that represents one character broadcast. For example, if a character signal representing one teletext is contained within one frame, one page is one frame, but if a character signal representing one teletext is not contained within one frame, one page is included. Will span two or more frames. Therefore, a signal indicating the beginning of the page (page data header) is provided at the beginning of this data structure, and a signal indicating the end of the page (page end) is provided at the end of the page. The decoder is the page data
The header identifies the beginning of the page and the page end identifies the end of the page. A character signal code for one page exists between the page data header and the page end. This character signal code is decoded by the decoder and output to the television screen or speaker of the television receiver.

A built-in receiver in which a decoder for a character signal code is incorporated in a conventional television receiver does not need to have a double circuit of the television receiver and is economically superior. In addition, there is an adapter designed to be able to receive teletext with a conventional television receiver. 1 of this adapter
One is the stand-alone adapter, which has a tuner and a decoder for receiving teletext, and can be used as is with existing television receivers of all types.
There is a connection type adapter as another adapter. This adapter does not have a TV signal channel selection and demodulation circuit, and uses a 21-pin multi-connector or video input / output terminal to connect to an AV TV to transfer various signals. The feature is to do.

[0007]

[Problems to be Solved by the Invention] Such a conventional TV
Broadcasting or teletext is one-way communication from a broadcasting station to a television receiver, so that the receiving side (viewer) cannot respond to the information on the transmitting side (broadcasting station). However, depending on the content of the broadcast, the sender may want to know the reaction of the receiver immediately, or the receiver may want to actively participate in the broadcast. For example, in an educational program, if the teacher (sending side) can immediately know how much the student (receiving side) understands the lecture and how many points were given to the teacher's question, the teacher will You can make changes to the content of lectures and questions according to your ability. In addition, when conducting a questionnaire, a questionnaire is currently being conducted by telephone. If you can immediately send the answer to the sender while watching the TV receiver,
Eliminates human labor and speeds up counting. Also, in a TV auction, if the bid price can be sent to the sender immediately after watching the TV, and the price can be immediately displayed on the TV, the same effect as being at the auction site while at home can be obtained. Can be expected. However, there is currently no system that meets these needs.

In the teletext, since the scanning lines that can be used for the teletext are less than the scanning lines of the television image,
The amount of information that can be sent is greatly limited. Therefore, it can be said that it is important to effectively use images in teletext.

An object of the present invention is to provide a system provided with a decoder having a function of introducing a device control code into text information in teletext and decoding the control code. Another object of the present invention is to provide a two-way communication system in which the receiving side can obtain information corresponding to teletext and can transmit the receiving side information to the transmitting side. further,
Another object of the present invention is to provide a multimedia system for simultaneously processing information from a device and teletext. Still another object of the present invention is to provide a teletext system in which the contents of teletext can be stored on the receiving side.

[0010]

According to the present invention, in the character code in the conventional character broadcasting, the transmitting side establishes a novel code system of the character code. The receiving side has a decoder capable of decoding the character code. The decoder is an extension of the function of the conventional decoder, and may be a decoder to which an algorithm capable of decoding a new code system is added. The receiving side can transmit the signal processed by the device based on the device control code to the transmitting side by using a telephone line or the like, and it is possible to establish a bidirectional communication system. If a personal computer is assumed as the device, the personal computer becomes a multimedia system by connecting a TV adapter. In addition, a composite image can be displayed on the picture tube by inputting the signal processed by the device to the picture tube through RGB switching through a decoder that converts the signal. Further, by providing the device with the storage device, the received character signal, or a part of the character signal including at least the character signal code, is stored in the storage device.

[0011]

DETAILED DESCRIPTION OF THE INVENTION FIG. 2 is a block diagram of a television receiver 10 having a conventional character signal decoder. The TV broadcast signal received by the antenna of the television receiver 10 is sent to the video detection circuit 23 and the audio detection circuit 24 via the tuner 21 and the video intermediate amplifier 22. The video detection circuit 23 and the audio detection circuit 24 detect the video signal and the audio signal included in the TV broadcast signal, respectively.
The video / audio switching unit 25 separates a video signal and an audio signal.
The separated video signal is sent to the RGB switching unit 28 via the video / color signal processing unit 27 and output as a video image to the picture tube 29a. The separated audio signal is output as audio from the video / audio switching unit 25 to the speaker 29b. TV receiver 10
The main part of the receiving circuit is indicated by reference numeral 20 surrounded by a broken line.

In the case of a character broadcast in which a character signal is added to this TV signal, the broadcast signal received from the antenna is also sent to the character signal decoder 26, where it is converted into a signal (code) that can be processed by the television receiver. To be done. The signal generated by the character signal decoder 26 is sent to the picture tube 29a or the speaker 29b, and a character (still image) is displayed as a video or output as a voice. As a result, the teletext is viewed by the viewer.

The present invention is based on the code system of the character signal in the character broadcast. As shown in FIG. 3, the data format of the character signal code system according to the present invention is a new data format in which a device control code is newly included in the character signal code of the current code system. A signal based on the code system of this novel data format is transmitted from the transmitting side, and at the receiving side, the character signal decoder decodes the character signal code and the device control code and separates them. The character signal code can be displayed on the picture tube in the conventional manner, and the device on the receiving side is controlled based on the separated device control code.

[First Embodiment] FIG. 4 is a block diagram of a system having a character signal decoder 30 according to the present invention. The character signal decoder 30 processes a signal of a new code system having a conventional character signal code and a newly added device control code. The character signal decoder 30 includes a control code decoding unit 30a. The signal decoded by the control code decoding unit 30a is given to the device control circuit 31 and used to control various devices 32.

In character broadcasting, characters and images are converted into digital signals and transmitted at the transmitting side, so the character code must be decoded at the receiving side, and a character code correspondence table is required for that purpose. . Since the device control code of the present invention is novel, a character code set (character code table) for the control code must be newly provided. However, in order to process the new character code set, the character signal decoder needs to be provided. It is sufficient to add an algorithm and a means for separating the device control code. That is, the algorithm may separate the character code set for the device control code from other character code sets, control the device according to the device control code, or send the code as it is to the device. This algorithm or circuit may be incorporated into the receiver decoder or the device.

The control code extracted by the device control code decoding section 30a of the character signal decoder is transmitted to the device control circuit 31 and further transmitted to the device 32, so that the device 32 operates according to the control code. . In the present specification, a device refers to various electric devices such as a PC (personal computer) and a game machine, and a device having an information processing function has a new control circuit for operating the device in accordance with the device control code. There is no need to install it in.

As described above, the novel teletext data format having the control code of the present invention is processed by the character signal decoder 30 of the present invention, and the device control code separated from the character signal is sent to the various devices 32. , Device 32
Can build a system that operates based on the device control code.

On the other hand, in a conventional receiver for receiving a teletext, when a teletext having the control code of the present invention is received, it can be received as in the past with a very slight influence, which is a particular problem. There is no.

In the present embodiment, the case where the character signal decoder expands the function of the conventional character signal decoder has been described, but another circuit having a function of processing a new code system is additionally provided. It will be easily understood that the present system can be achieved by adding it to the character signal decoder.

There are various usages of the device control code in the teletext, and the device control code includes a telephone number for connection by a telephone line, and educational contents for responding to the teletext from a CD-ROM. It is possible to include a command to be output to the display. If the device control code contains a telephone number to enable two-way communication, the receiving side stores it in memory and calls it as necessary to call the receiving side device via a modem. And connect to the telephone line.

Next, what can be concretely done by using this control code will be explained. In a television auction, it is assumed that the transmitting side places the motorcycle Z in an auction. The CD-ROM in which the information about the auction is recorded is distributed in advance to the participants of the auction, and the participant sets the CD-ROM in the device at a predetermined time (in this case, the device is a PC or C
A game machine with a built-in D-ROM drive, preferably having an algorithm for separating and executing device control codes). The sender sends the device control code together with the character code at the start of the auction, and the receiver displays the character information about the auction on the TV receiver, while the control code activates the device and records it in the CD-ROM. Motorcycle Z to be auctioned now is selected from many available
It is displayed on the screen of C. After this, the participant can operate the PC at his / her will to see the required images of the left side body, right side body, meter devices, brakes, etc. of the motorcycle Z. When the participant wants to inform the organizer of the purchase intention or the price, the interactive communication system using a telephone line can be used. For this, refer to the embodiment of the interactive communication system. I want to.

Of course, in the conventional teletext, it is possible to transmit still images of the motorcycle Z one after another from the transmitting side to conduct an auction, but in this case, one-sided information from the transmitting side is transmitted. Since the receiving side receives the image, the individual cannot select the image he or she wants to see, and cannot perform bidirectional communication.

[Second Embodiment] FIG. 5 shows a two-way communication system using telephone communication in this system. In the present embodiment, a system in which the device 32 controlled by the device control code sends a response based on the control code to the teletext transmission side via the telephone line 52 via the modem 51 will be described. In this embodiment, considering the distance education system, the device 32 is assumed to be a personal computer having a memory function.

The device control code in the character signal includes the telephone number (telephone number for data communication) of the character broadcasting station. On the other hand, a CD with educational contents
-ROM is distributed in advance to the viewer (or purchased by the viewer), and the learning menu of the day is broadcast by teletext. Broadcasting the learning menu by teletext in this way is particularly effective when the learning menu on the day is unknown until immediately before or when it is necessary to change it immediately before. The viewer can select the CD by selecting from the menu.
-Search educational contents from ROM. Furthermore, when the viewer solves the exercise and wants to send the answer to the sender (or the tally station), the telephone number included in the device control code is called from the memory and the PC 32 is automatically connected to the telephone line. Connect to 52. Therefore, the viewer can send the information (answer in this case) from the viewer side to the host computer 53 on the sending side from the personal computer 32 via the modem 51. On the transmitting side, the answers sent from the viewer can be corrected and added up, and the results can be put on a teletext and sent again to the viewer as an image. In this case, the sending side (questioner) can judge the ability of the viewer from the answer result and change the question, and can also make a detailed response.

Although the correspondence education system has been described as a preferred example of the two-way communication system, it goes without saying that the two-way communication system can be applied to the above-mentioned auction system, questionnaire system, or the like.

[Third Embodiment] FIG. 6 is a block diagram of a system in which a teletext image display means is a multimedia system. Since the teletext signal is a digital signal, the output of the device on the receiving side, which is a digital signal, can be output simultaneously with the teletext on the picture tube 29a by being subjected to video / color signal processing. The output from the device to the teletext image display means may be an image held on the receiving side or a display of information retrieved by access information to a database of other information. For example, in an educational program, a teacher (sender)
If the student gives a problem on the teletext and displays the answer field on the picture tube 29a, the device (PC) 32 by the student (reception side)
When the input (answer) from the image is processed in the video / color signal processing unit 61 and output to the answer column on the same screen 29a, the student does not need to see two displays alternately, and a single screen is displayed. It is convenient because you only have to look at 29a.
This is a multimedia system. As a matter of course, it is possible to divide the screen into several parts and display teletext on one screen and display the result of the operation of the device on another screen.

FIG. 7 is a block diagram of a system in which the display 71 of the device is a multimedia system. Device (for example, a personal computer with a display)
Connect a TV adapter to the device, and display on the display of the device the text broadcasting image-processed by the video / color signal processing unit 72 and the processing result on the PC in a double-layered manner or display in a window format. Can be divided and displayed. As a usage method, the usage example in the description of FIG. 6 can be similarly applied to the multimedia system in FIG. 7.

An important feature of the present invention is to incorporate a device control code in teletext data and add a circuit and an algorithm capable of decoding the device control code in the text signal decoder. Since the character signal decoder currently exists, it is only necessary to separate the device control code and add a circuit and an algorithm for executing the device control corresponding to the control code. The system can be used to build bi-directional communication systems and multimedia systems as described above. It is also possible to build a system that integrates a two-way communication system and a multimedia system.

[Fourth Embodiment] In the fourth embodiment, a received character signal is stored (recorded or stored) in a storage device.

FIG. 8 is a block diagram showing the system configuration of the fourth embodiment. The same devices and circuits as those in the first embodiment (FIG. 4) described above are designated by the same reference numerals.
On the other hand, as a newly added device, a storage device 81 for storing all of the received character signal or a part of the character signal including at least the character signal code is provided and connected to the device 32. The storage device 81 includes a semiconductor memory device (RAM, IC card, memory card, RAM disk, etc.), magnetic disk memory device (hard disk memory device, floppy disk memory device, etc.), optical disk memory device (magneto-optical disk). A storage device (MO), a mini disk (MD), etc. are included. Further, the storage device 81 may be provided outside the device 32 or may be incorporated inside the device 32.

FIG. 9 shows an example of a detailed data structure of the device control code shown in FIG. The device control code is basically composed of a code indicating the type of the device control code (hereinafter referred to as “control identification code”) and text data indicating the content of the control identification code.

The control identification code "time" indicates that the subsequent text data "time data" is data representing the broadcast time (both start time and / or end time) of the teletext code. There is. The control identification code “channel” indicates that the text data “channel data” following the control identification code is data representing the broadcast channel of the teletext. The control identification code “broadcast target area” indicates that the text data “area data” following the control identification code is data representing an area (for example, Tokyo Tama region or Yokohama region) to be broadcast target of the character broadcast. The control identification code "broadcast content classification" is
Text data that follows it "Broadcast content classification data 1"
Indicates that the data represents a large classification of broadcast contents. Broadcast contents are roughly classified into disaster emergency broadcast, news broadcast, weather forecast broadcast, user guide broadcast, notification broadcast, educational broadcast, shopping broadcast, quiz broadcast, CM broadcast and the like. The control identification code “broadcast content minor classification” indicates that the text data “broadcast content classification data 2” following the control identification code is data representing a minor classification of the broadcast content. Subcategories of broadcasting contents include earthquakes, tsunamis, typhoons, fires, etc. as subcategories of "Disaster Emergency Broadcast", and politics, economy, sports, entertainment, and society in general as subcategories of "News Broadcast". And subdivisions of the large category “CM broadcasting” include household daily goods, household electric appliances, household medicines, cars, services, and the like.

The control identification code "teletext content" refers to how one or more control identification codes and text data that follow display a character signal code (ie, teletext) on a television screen. This indicates that the data is the data that specifies the display form. In other words, the control identification code “display method” (which may include two or more control identification codes) that follows the control identification code “text” is the size of the character that displays the character signal code on the TV screen. A character, a shape, a shape, a color, the presence / absence of decoration (enclosure, underline, etc.), a display position, and the like, and specific values are specified for the text data that follows. For example, the first control identification code “display method” and the text data “broadcast content data” following the “text content” indicate the size of the character, and the second control identification code “display method” and The text data “broadcast content data” indicates the display position. If there is a display form not specified in this display form, the default value preset in the television receiver 20 or the device 32 can be used. For example, when the color for displaying characters is not specified and black is specified as the default value, the characters of the character broadcast are displayed in black on the television screen.

The control identification code "device operation" indicates ON / OFF operation of the television screen, start / stop operation of recording of a video tape recorder (VTR) connected to the television, and the like. Power on / off, start recording /
The content of the operation such as stop is shown in the text data "operation data" following this control identification code.

If there is no particular data to be set in the text data, special data (for example, Null) that does not represent any content can be set in the text data portion, and its control identification The code and text data portions can be omitted from the device control code. Further, the device control code shown here is only an example, and a device control code other than the above can be added as the device control code. Further, it goes without saying that the order of the device control codes is merely an example, and the device control codes may be arranged in a different order.

The accumulation mode for accumulating a character signal accompanied by such a device control code includes a mode similar to that for recording a television program by a VTR. That is, a manual mode in which the viewer (user) starts the accumulation manually, and an air check mode (reserved accumulation mode) in which the viewer reserves the accumulation start in advance and the accumulation automatically starts There is.

In the manual mode, when the viewer commands the device 32 to start storage, the character signal (all the character signals or at least a part of the character signal including the character signal code) after the command is stored in the storage device 81. Accumulated. At the time of storage, it is possible to specify a teletext channel to be stored. When the channel designation is performed, the device 32 causes the tuner 21 (FIG. 2) inside the code 20 to
It is set to the designated channel so that the character signal broadcast on the designated channel is given to the device 32.

In the air check mode, the storage condition data indicating what kind of character signal is to be stored is preset in the device 32 by the viewer, and then the character signal satisfying the storage condition data is set. Only the storage device 81 is stored. The storage condition data set by the viewer includes the same device control code as described above. For example, time data representing a time zone in which a character signal is accumulated (hereinafter referred to as “set time data” to be distinguished from “time data” in the device control code. The same applies to other storage condition data. Is added to the beginning of the word), set channel data that indicates the channel on which the character signal code to be stored is broadcast, set broadcast target area data that indicates the broadcast target area, and set broadcast content large classification data that indicates the broadcast content major classification. is there. The set time data includes both the start time and / or the end time. Specifically, from 8:15 am to 1:30 pm
When accumulating character signals over minutes, the viewer starts at 8:15 am and ends at 1:30 pm
Each minute will be set. The data set by the viewer is stored in the internal memory (RAM, etc.) of the device 32.
(Not shown). In the portion of the storage condition data that the viewer has not set, special data such as Null described above is set in the storage condition data.

The storage condition data is set using an input device (not shown) and a guide display displayed on the television screen of the picture tube 29a. Input device is a device
It may be an input panel integrated with 32, or a remote control device or PDA (Personal Digital Assistant) that communicates with device 32 in a wired or wireless manner (such as infrared rays).
It may be. The guidance display displayed on the TV screen is
This is the same as the guide display displayed when setting the reserved recording in the VTR. For example, first, a list of all functions of the device 32 is displayed on the TV screen. The list of all functions includes "data storage / playback", "delete / save playback content", and the like. Next, when the viewer selects "data storage / playback" from the list of all functions using the input device such as the remote controller described above, the TV screen displays a guide for setting the storage condition data described above. Is displayed,
The viewer sets the storage condition data according to this guide. When the setting of the storage condition data is completed, a guide for correction / confirmation of the setting contents is displayed, and the viewer corrects / confirms according to this guide. Then, in the same way as the TV program is reserved for recording on the VTR, the viewer
Set device 32 to air check mode using the input device.

When the device 32 has a display, the guide display displayed on such a television screen can be displayed on the display, or when the PDA is used, the display provided on the PDA. It can also be displayed on a liquid crystal display.

The device 32 set to the air check mode first sets the tuner 21 (FIG. 2) in the reference numeral 20 so that the character signal of the channel designated by the set channel data is given to the device 32. Control. After that, the device 32 executes the processing shown in the flowcharts of FIGS. FIG. 10 is a flowchart showing an outline of the process of the device 32 set in the air check mode.
11 and 12 are flowcharts showing the details of the process of step 102 of FIG. 13 and 14 are flowcharts showing details of the process of step 103 of FIG. These processes can be realized by a hardware logic circuit, and the CPU and this CPU
It can also be realized by a program (software) for instructing to operate. When realized by the latter,
The program can be stored in the internal ROM of the device 32 or in an external storage medium (hard disk, floppy disk, IC card, memory card, magnetic card, etc.). it can. Further, a part of the program may be stored in the internal ROM and the other part may be stored in the external storage medium.

In FIG. 10, first, the received character signal for one frame (both the character signal code and the device control code) is stored in the internal memory (RAM, reception buffer, etc.) of the device 32 (step 101). . Subsequently, the device control code of the character signals stored in the internal memory is analyzed (step 102). Since the device control code exists at a predetermined position of the character signal for one frame, in the internal memory storing this character signal, the device control code can be read by reading only the part where the device control code exists. Code analysis can be performed.

Turning to FIG. 11, it is judged whether or not the device control code exists in the received character signal (step 201). If the device control code does not exist (NO in step 201), error processing is performed (step 202). The error processing includes, for example, a process of storing the error code in the storage device 81 and then ending the storage process of the character signal, a device control code of the next received one frame after storing the error code in the storage device 81. There is a process to move to the process of. If the device control code exists, the control identification code shown in FIG. 9 and the text data following it are processed (step 20).
3-213).

First, it is determined whether the control identification code is "time" (step 203). Since the control identification code at the beginning of the device control code is "time", the determination result of step 203 is YES. Then, time data is generated based on the text data following the control identification code, and the generated time data is stored in the device.
It is stored in 32 internal memories (step 204). Then, moving to FIG. 12, it is judged whether or not the processing of all device control codes is completed (step 215). Since the processing of all device control codes has not been completed (NO in step 215), the process returns to step 203 shown in FIG. 12 again, and the next device control code is processed. Since the next device control code is the control identification code "channel", the determination result in step 203 is NO, and step 205
The judgment result of is YES. Then, based on the text data, channel data is generated and the device
It is stored in 32 internal memories (step 206). In this way, the control identification code and the text that follows it
The data is processed one after another, and the control data necessary for accumulating the character signal is stored in the internal memory of the device 32 (steps 207 to 213). When the processing of all the device control codes is completed (YES in step 215 of FIG. 13), the device control code analysis processing is completed.

When another device control code is added to the device control code shown in FIG. 9, a step of judging and processing these added device control codes should be added to the flowchart shown in FIG. Needless to say.

Returning to FIG. 10, when the device control code analysis process is completed, a storage setting correspondence process is performed based on the result of this analysis process (step 103). The details of this process are shown in the flowcharts of FIGS. 13 and 14.

In FIG. 13, first, the set time data which is the first data of the storage condition data is the device 32.
Is read from the internal memory (step 301). Then, it is judged whether the read data is set time data (step 302). This determination can be made based on the read address of the data on the internal memory, the number of times of reading the setting data from the storage condition data, and the like. If the read data is set time data (YES in step 302), it is determined whether this set time data is equal to the time data of the device control code generated in step 204 of FIG. 11 described above ( Step 303). If they are equal (step
If YES in 303), the flag designating the storage of the character signal in the storage device 81 is set to ON (step 304). If they are not equal (NO in step 303), the flag is set to OFF (step 308). This flag is used in step 311 described later.

When the processing of the set time data is completed, the processing returns to step 301 of FIG. 13 through step 317 of FIG. 14, and the next set data, the set channel data, is read from the internal memory of the device 32. Since the read data is the set channel data, step 30
The determination of 2 is NO, and the determination of step 306 is YES. Then, this set channel data is
It is determined whether it is equal to the channel data of the device control code generated in step 206 of step 11 (step 306). As described above, the tuner 21 (FIG. 2) is already set to receive the broadcast signal of the channel set by the viewer, and the device 32 receives the character signal of the set channel. Therefore, this judgment is generally YES. If the set channel data differs from the channel data of the device control code due to some cause such as a failure of the tuner 21 or the device 32, the above flag is turned off (step 308). Thereafter, the process returns to step 301.

The same processing is performed for the remaining device control codes (excluding the control identification code "text contents" and the control identification code "display method") shown in FIG. 9 and the corresponding storage condition data. Be seen. Then, when the determination results of both steps 309 and 310 are YES, the process proceeds to step 311. In step 311, if the flag is ON (that is, the received device control code satisfies the storage condition data set by the viewer), the character signal stored in the internal memory of the device 32 is
It is stored in the storage device 81 (step 312). The stored data may be all of the character signal code and the device control code, or the character signal code and the control identification code “character broadcast content” and “display method” of the device control code and their texts.・ It may be data. If the flag is OFF (that is, the received device control code does not satisfy the storage condition data set by the viewer) or the determination result in step 310 is NO, the process proceeds to step 313 and the storage is performed. Absent.

Then, the process returns to step 301 again,
After the steps 302 to 309, the process proceeds to the setting device operation data processing (step 314 in FIG. 14). When the set device operation data is equal to the device operation data of the device control code (YES in step 315), the device 32 performs the operation control indicated by the device operation data (step 316). For example, when the operation control data is for displaying the character signal data accumulated by turning on the television screen, the data is automatically turned on even if the television screen is in the off state. Is displayed on the TV screen.
This is useful for viewers when emergency information such as an earthquake is broadcast as a teletext.

Then, when the processing of all device control codes is completed, the determination result of step 317 becomes YES,
The process of step 103 in FIG. 10 ends. Then, the same processing is repeated for the next new character signal of one frame (steps 101 to 103 in FIG. 10).

After the accumulation, the viewer can display the accumulated teletext on the television screen by using the above-mentioned input device. When the input device has a display such as a PDA, it is possible to display the teletext stored on the display of the input device. In this display, since the code indicating the display method among the device control codes is also stored in the storage device 81, the display according to the code of this display method is performed.

When the viewer has not set the set time data of the storage condition data (for example, special data such as Null is set in the set time data), other information such as a channel or a broadcast target area is displayed. It is also possible to store the character signals in all the time zones satisfying the storage condition in the storage device 81. In addition, after setting the necessary storage condition data other than the time, the viewer directly commands the start of storage, and of the character signals received after the command, stores the character signal satisfying the storage condition data in the storage device 81. You can also Furthermore, if the tuner 21 (FIG. 2) is capable of receiving broadcasts on multiple channels, setting channels in the set channel data allows the viewer to view the current channel in addition to the channel currently being viewed. It is also possible to store a character broadcast (all character broadcasts or a part of character broadcasts satisfying the storage condition) of a channel (back channel) other than the currently used channel.
In addition, even if the TV screen is in the OFF state, it is possible to store the teletext (all the teletexts or a part of the teletexts satisfying the storage condition). The teletext broadcast can also be displayed on the TV screen. As another application, not only the storage control of teletext but also the start / stop control of the recording of the television program (drama, movie, etc.) on the VTR can be performed by the device control code.

As a modified example of the fourth embodiment, a modem is connected to the device 32 in FIG. 8 and data is transmitted to a broadcasting station via a telephone line as in the second embodiment (FIG. 5) described above. Alternatively, as in the third embodiment (FIGS. 6 and 7), a video / color signal processing circuit can be connected to perform multimedia processing.

[0055]

As described above, by using this system, not only the device on the receiving side can be controlled by the control code, but also the receiving side sends information to the transmitting side in correspondence with the character broadcast. A two-way communication system can be constructed. Further, the received teletext can be stored in the storage device.

[Brief description of drawings]

FIG. 1 shows a data structure of a character signal for one page in a conventional character broadcast.

FIG. 2 is a block diagram showing a system configuration of a conventional teletext system.

FIG. 3 shows a data structure of a character signal for one page in a character broadcast according to the present invention.

FIG. 4 is a block diagram showing a system configuration of a teletext system in the first embodiment.

FIG. 5 is a block diagram showing a system configuration of a bidirectional communication system according to a second embodiment.

FIG. 6 is a block diagram showing a system configuration of a multimedia system according to a third embodiment.

FIG. 7 is a block diagram showing a system configuration of a multimedia system according to a third embodiment.

FIG. 8 is a block diagram showing a system configuration of a teletext system including a storage device according to a fourth embodiment.

FIG. 9 shows an example of a data structure of a device control code in the fourth embodiment.

FIG. 10 is a flowchart showing an outline of processing of a device in the fourth embodiment.

FIG. 11 is a flowchart showing details of the processing of the device in the fourth embodiment.

FIG. 12 is a flowchart showing details of the processing of the device in the fourth embodiment.

FIG. 13 is a flowchart showing details of processing of a device in the fourth embodiment.

FIG. 14 is a flowchart showing details of processing of a device in the fourth embodiment.

[Explanation of symbols]

 20 Receiver circuit main part 30 Character signal decoder 30a Device control code decoding part 31 Device control circuit 32 Device 51 Modem 81 Storage device

Claims (12)

[Claims] 1. A teletext system, characterized in that, in teletext broadcasting, a device control code is included in a broadcast wave containing a text signal code, and the device control code controls a device on the receiving side. 2. A system for receiving a teletext having a character signal code and a device control code, wherein the system has a character signal decoder, and the character signal decoder decodes the character signal code and the device control code. A teletext system having means. 3. The teletext wave has a character signal code and a device control code, the device on the receiving side is controlled according to the device control code, and the receiving side is transmitted via a modem connected to the device. A teletext system characterized by being able to communicate with the sender. 4. A device for controlling a device on the receiving side in response to the device control code, a device for image-processing a signal generated by the device, and a device for displaying an image of a teletext. The teletext system according to claim 2, further comprising means for displaying the generated signal. 5. A device for controlling a device on the receiving side in correspondence with the device control code, and a device for displaying a teletext together with an image processed by the device on an image display device in the device. Claim 2
The teletext system described in. 6. The teletext system according to claim 2, wherein the decoding means includes a character code set for the character signal code and the device control code. 7. Storage means for storing a character signal, the character signal code being included in the received broadcast signal and having a character signal code indicating the broadcast content of the character broadcast and a device control code indicating the control content of the receiving side device. And a control means for controlling the receiving side device based on the device control code included in the character signal stored in the storage means. 8. The apparatus further comprises storage means for storing a part of a character signal including all or at least the character signal code of the character signal, wherein the device control code included in the character signal is all or at least the character of the character signal. Instructing the control means to store a part of a character signal including a signal code in the storage means, wherein the control means is based on the device control code,
The teletext broadcasting system according to claim 7, which controls the storage of all or at least a part of the character signal including the character signal code in the storage means. 9. A storage means for storing a part of a character signal including all or at least a character signal code of the character signal, and a character signal including all or at least a character signal code of the character signal to be stored in the storage means. Further comprising input means for inputting a condition for selecting a part, wherein the control means judges whether or not the device control code satisfies the condition input by the input means, The teletext broadcasting system according to claim 7, which controls the storage of all or at least a part of the character signal including the character signal code in the storage means. 10. A signal included in a received broadcast signal, and
A device for storing a character signal in a storage device, the device including a character signal code indicating a broadcast content of a teletext and a device control code indicating a control content of a receiving side device, and the device being included in the character signal stored in the storage device. A teletext system control method for controlling a receiving device based on a control code. 11. The device control code included in the character signal is for instructing to store all or a part of the character signal including the character signal code in the receiving side storage device, 11. The teletext system according to claim 10, wherein the control based on the device control code is control of processing of accumulating all or a part of a character signal including the character signal code of the character signal in the storage device. Control method. 12. A condition for selecting all or at least a part of a character signal to be stored in a storage device is input in advance, and the control based on the device control code is performed. Determining whether or not the device control code satisfies the input condition, and in the case of satisfying, stores all or at least part of the character signal including the character signal code in the storage device. The teletext system control method according to claim 10, which is control.