JPH0823523A - Decoder for character broadcasting and character information updating discrimination method - Google Patents

Abstract

PURPOSE:To easily recognize that updating is performed even when character information by character broadcasting is updated with simple constitution and to surely enjoy latest character information service by the character broadcasting. CONSTITUTION:When it is judged that the stored character information is the character information of required program information, a control microcomputer 4 generates character signals by a pattern memory and a color memory and stores them in a data storage RAM 12 and the character signals stored in the data storage RAM 12 are outputted through a D/A converter 13 to a television receiver by the control of the control microcomputer 4. Also, when it is judged that the character information is updated as the result of a character information updating discrimination processing, the control microcomputer 4 controls an OSD 15, generates the message of the updating and outputs it to the television receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext decoder for decoding teletext signals and a text information update discriminating method.

[0002]

2. Description of the Related Art Various broadcasts are being made due to the widespread use of today's broadcast formats, such as high-definition television broadcasts, satellite broadcasts, and character broadcasts.

Particularly in the case of character broadcasting, unlike the conventional standard television signal, the character signal is superimposed as character information in the vertical blanking period of the video signal. That is, in teletext, the text signal is different from the video signal and is superimposed as a digital signal in the straight-back blanking period. To receive such a teletext, it is necessary to use a dedicated teletext decoder, and in recent years, various standard television signal receivers and high-definition television signal receivers having such a teletext decoder have been developed. ing.

Text broadcasting has various broadcasting formats, and there is a format in which characters and the like are displayed on the entire screen and subtitles and the like for complementing an image displayed on the display unit are displayed. As a result, for example, weather forecasts and western-style subtitle services are provided.

[0005]

However, the conventional teletext decoder only sequentially receives designated programs, for example, for information such as weather information, news, traffic information, etc., which is appropriately updated. The operator does not know when the received information has been updated, and the operator must check the content of the information at any time to see if the information has been updated, which reduces convenience. There's a problem.

The present invention has been made in view of the above circumstances, and with a simple configuration, even when character information by character broadcasting is updated, it can be easily recognized that the character information has been updated, and the character broadcasting can be reliably performed. It is an object of the present invention to provide a teletext decoder device and a text information update discriminating method capable of enjoying the latest text information service.

[0007]

A teletext decoder according to claim 1, wherein the teletext decoder decodes a teletext signal, generates text information, and displays an image based on a television signal on which the text broadcast signal is superimposed. In the teletext decoder for outputting to the means, the data storage RAM 12 as a storage means for storing the character information, the newly input character information and the character information stored in the data storage RAM 12 are compared, and the character information is updated. If the character information is updated based on the determination result of the control microcomputer 4 and the control microcomputer 4 as the update determination means for determining whether or not
The OSD 15 as an update information output unit that outputs update information indicating that the update has been performed.

According to a sixth aspect of the present invention, the character information update determination method decodes a character broadcast signal to generate character information, stores the character information in a data storage RAM 12 as a storage unit, and stores the character information stored in the data storage RAM 12 into a character. A method for discriminating update of character information of a teletext decoder for outputting to a display means for displaying an image based on a television signal on which a broadcast signal is superimposed, which is step S2 as an input step for inputting new text information, and step S2. At step S4 as an update determination step of comparing the newly input character information with the character information stored in the data storage RAM 12 to determine whether the character information has been updated, and based on the determination result of step S4 When the information is updated, step S as an update information output step for outputting information indicating that the information has been updated Configured with the door.

[0009]

In the teletext decoder according to the first aspect, the text information newly input by the control microcomputer 4 and
Compare with the character information stored in the data storage RAM 12,
When the OSD 15 determines whether the character information has been updated, and the OSD 15 outputs the update information indicating that the OSD 15 has updated the character information based on the result of the determination by the control microcomputer 4, the character is updated with a simple configuration. Even when the character information by broadcasting is updated, it can be easily recognized that it has been updated, and it is possible to certainly enjoy the latest character information service by character broadcasting.

In the character information update determination method according to claim 6, in step S4, the character information newly input in step S2 is compared with the character information stored in the data storage RAM 12, and the character information is updated. If the character information is updated based on the result of the determination in step S4 in step S5, the information indicating that the character information has been updated is output. , Easy to recognize that it was updated,
It is possible to certainly enjoy the latest text information service by text broadcasting.

[0011]

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

1 and 5 relate to an embodiment of the present invention. FIG. 1 is a block diagram showing the configuration of an embodiment of a teletext decoder device, and FIG. 2 is a control microcomputer 4 of FIG. FIG. 3 is a flow chart showing the flow of processing for determining the text information update, FIG. 3 is a block diagram showing the configuration of a first modification of the teletext decoder device of FIG. 1, and FIG. 4 is the teletext decoder device of FIG. FIG. 5 is a block diagram showing the configuration of the second modification, and FIG. 5 is a block diagram showing the configuration of the third modification of the teletext decoder apparatus of FIG.

The protocol of the character signal by the character broadcasting in the character broadcasting decoder device of the present embodiment is an open system interconnection reference model (ISO DIS 7498 Open Syste) established by the International Organization for Standardization (ISO).
Description is omitted because it is a hierarchical model according to m Interconection-Basic Reference Model).

As shown in FIG. 1, in the teletext decoder device 1 of this embodiment, a signal transmitted by a television broadcast wave is received by an antenna 2 and selected by a tuner 3. The tuner 3 is controlled by the control microcomputer 4 (update determining means) so as to tune to a specific frequency.

The signal selected by the tuner 3 is detected as a video signal by a video intermediate frequency signal processing / detection circuit (hereinafter referred to as VIF) 5, and the video signal detected by the VIF 5 is specified in a vertical blanking period. It is output to the data slicer 6 which detects the character information superimposed on the line determined by the horizontal synchronizing signal.

The data slicer 6 detects the superimposed character information as a digital signal, and the detected character information is output to the error correction processing circuit 7. The error correction processing circuit 7 is controlled by the control microcomputer 4, and when the error correction processing circuit 7 finishes the error correction of the input character information, the error correction processing circuit 7 interrupts the control microcomputer 4 to indicate that the readable period has come The control microcomputer 4 that outputs the control signal and receives the interrupt control signal reads the error-corrected character information from the error-correction processing circuit 7.

The control microcomputer 4 has a function of a character broadcasting decoder, and stores character information read from the error correction processing circuit 7 in a buffer memory (not shown) in the control microcomputer 4. Then, the control microcomputer 4 determines whether the stored character information is the character information of the required program information, and also performs character information update determination processing described later. The television receiver 1 determines whether the stored character information is character information of required program information.
The program information specified by the user is input from the key input device 10 connected to the remote controller or a remote controller light receiving unit 11 for inputting a signal from a remote controller (not shown).

When the control microcomputer 4 determines that the stored character information is character information of the required program information,
A character signal is generated by a pattern memory and a color memory (not shown) and stored in the data storage RAM 12 (storage means). The character signal stored in the data storage RAM 12 is passed through the D / A converter 13 under the control of the control microcomputer 4. Is output to a television device (not shown). When the control microcomputer 4 determines that the character information has been updated as a result of the character information update determination process described later, it controls the OSD 15 (update information output means) to, for example, "received new news". Message is generated and output to a television device (not shown).

The function of the teletext decoder of the control microcomputer 4 is described in detail in, for example, Document 1 (Handbook of teletext reception: January 15, 1986, published by Japan Broadcasting Corporation). Therefore, the description is omitted.

Next, the character information update determination processing by the control microcomputer 4 of the teletext decoder device 1 will be described. The control microcomputer 4 determines whether the character information is updated by detecting a change in the received character information.

That is, as shown in FIG. 2, in the character information update discriminating process by the control microcomputer 4, in step S1, a program has already been designated by the user in order to recognize the program information for discriminating the update of data. To determine. If the program is not designated in step S1, the character information update determination process is not necessary, so the process ends.

When it is determined in step S1 that the program is designated, it is determined in step S2 (input step) whether or not the character information of the designated program is received. If not, it is received in step S2. If waiting and receiving, the process proceeds to step S3. In step S3, it is judged whether or not the received character information is the first reception, and if it is the first reception, it is not necessary to judge whether or not it has been updated, so the processing is terminated, and the character information of the program already specified before If it is received, the process proceeds to step S4 (update determination step).

At this time, since the previously received previous character information is already stored in the data storage RAM 12, the previously received character information stored in the data storage RAM 12 is compared with the currently received character information in step S4. , It is determined whether they match, and if they match, the process is terminated because they have not been updated. If they do not match, it means that the character information has been updated, so step S5 (update information output step). And the OSD1 in step S5.
5 is controlled to generate a message such as "new news received" and output to a television device (not shown).

When the program is not designated in step S1, the character information update determination process is not necessary and the process is terminated. However, for example, a preset specific program (weather forecast, news, traffic information, etc.) is set. It is also possible to judge whether or not the character information of is updated.

As described above, according to the teletext decoder device 1 of the present embodiment, every time new text information of a designated program is received, the text of the previously received same program stored in the data storage RAM 12 is received. By comparing with the information, it is determined whether the content of the character information has changed, and when the character information is updated, an update message or the like is output to a television device (not shown). Even when the character information by is updated, it can be easily recognized that it has been updated, and the latest character information service by character broadcasting can be surely enjoyed.

Although the teletext decoder device is constructed separately from the television device, the present invention is not limited to this.
It goes without saying that the same effect can be obtained also in the integrated teletext television device in which the teletext decoder device of the present embodiment is incorporated. That is, the teletext decoder apparatus according to the present embodiment can be embodied as either a stand-alone apparatus or a built-in apparatus.

Further, it is assumed that the OSD 15 is controlled to generate a message such as "new news has been received" and output to a television device to recognize that the character information has been updated. It is not limited.

That is, as shown in FIG. 3 showing a first modification of the teletext decoder device of the present embodiment, the OSD 15 is controlled to generate a message such as "new news received", Instead of outputting to a television device (not shown), the control microcomputer 4 lights up the LED 21 provided on the front panel of the teletext decoder device, for example, so that the character information is recognized as updated. It may be configured, in this case,
It is also possible to use the message display by OSD 15 together.

Further, as shown in FIG. 4 showing a second modification of the teletext decoder apparatus of the present embodiment, the OSD 15 is controlled to generate a message such as "new news received", Instead of outputting to the television device (not shown), the control microcomputer 4 may be configured to recognize that the character information has been updated by ringing a buzzer 31 provided in the teletext decoder device, for example. Well, in this case, it is also possible to use the message display by the OSD 15 together.

Further, as shown in FIG. 5 showing a third modification of the teletext decoder device of the present embodiment, as shown in FIG.
The character signal stored in M12 is output to an external output terminal 41 connected to a television device (not shown) and an external personal computer (not shown) via the D / A converter 13 under the control of the control microcomputer 4. In addition, it is possible to configure a teletext decoder device. In this case, the OSD 15 is controlled to generate a message such as "new news received" and outputs it to a television device (not shown). The control microcomputer 4 may output an interrupt signal to an external personal computer (not shown) to the external output terminal 41, which allows the external personal computer (not shown) to recognize that the character information has been updated.

[0031]

As described above, according to the teletext decoder of the first aspect, the character information newly input by the update discriminating means and the character information stored in the storage means are compared to obtain the character information. It is determined whether or not the information has been updated, and the update information output means outputs the update information indicating that the text information has been updated based on the determination result of the update determination means. Even when the character information by character broadcasting is updated, it can be easily recognized that the character information is updated, and the latest character information service by character broadcasting can be surely enjoyed.

According to the character information update discriminating method described in claim 6, the character information newly input in the input step in the updating discriminating step is compared with the character information stored in the storage means to obtain the character information. Is updated and the update information output step outputs the information indicating that the text information has been updated when the text information is updated based on the determination result of the update determination step. Even if it is done, it can be easily recognized that it has been updated, and the latest text information service by text broadcasting can be surely enjoyed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a teletext decoder device of the present invention.

FIG. 2 is a flowchart showing a flow of processing for determining character information update by the control microcomputer 4 of FIG.

3 is a block diagram showing the configuration of a first modification of the teletext decoder device of FIG. 1. FIG.

FIG. 4 is a block diagram showing a configuration of a second modification of the teletext decoder device of FIG. 1.

5 is a block diagram showing a configuration of a third modified example of the teletext decoder device of FIG. 1. FIG.

[Explanation of symbols]

 1 Decoder device for teletext 2 Antenna 3 Tuner 4 Control microcomputer 5 VIF 6 Data slicer 7 Error correction processing circuit 10 Key input device 11 Remote control light receiver 12 Data storage RAM 13 D / A converter 15 OSD 21 LED 31 Buzzer 41 External output Terminal

Claims (6)

[Claims] 1. A teletext decoder that decodes a teletext signal, generates text information, and outputs the text information to a display means for displaying an image based on a television signal on which the text signal is superimposed, in which the text information is stored. A storage unit for performing a comparison, the newly input character information and the character information stored in the storage unit, and an update determination unit that determines whether the character information has been updated; and a determination made by the update determination unit. A teletext decoder comprising: an update information output unit that outputs update information indicating that the text information has been updated, based on the result. 2. The update information output means is at least O
The teletext decoder according to claim 1, wherein the update information is output by SD. 3. The teletext decoder according to claim 1, wherein the update information output means includes an LED that outputs the update information. 4. The teletext decoder according to claim 1, wherein the update information output means includes a buzzer that outputs the update information. 5. The update information output means outputs the update information to a second display means for displaying a video based on a television signal on which the teletext signal is superimposed. The teletext decoder described in 2. 6. A display for decoding a teletext signal to generate text information, storing the text information in a storage means, and displaying an image based on a television signal on which the text information stored in the storage means is superimposed. A method of determining character information update of a teletext decoder for outputting to a means, the input step of inputting the new character information, the character information newly input in the input step,
An update determination step of comparing the character information stored in the storage means to determine whether the character information is updated, and an update when the character information is updated based on the determination result of the update determination step. An update information output step of outputting information indicating that the character information update determination method is performed.