JPH08140064A - Teletext receiver - Google Patents

Abstract

PURPOSE: To immediately display a teletext even when a broadcast station to be received is switched. CONSTITUTION: At the time of receiving the broadcast station for a master screen, by turning a tuner 14 to the one for receiving the broadcast station for a slave screen or the one for receiving the teletext, since the broadcast station received in the tuner 14 is not changed even when the broadcast station for the master screen is switched, the broadcast station received for the slave screen is not changed no matter what broadcast station is on the mester screen. Thus, regardless of the broadcast station of the master screen, the broadcast station selected for the slave screen is not changed, and when the broadcast station for the slave screen performs the character broadcast, the character broadcast is displayed regardless of the selection of the broadcast station for the master screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext receiving apparatus having a teletext receiving function.

[0002]

2. Description of the Related Art In recent years, character broadcasting has been performed in which character signals obtained by encoding information such as characters and figures in the form of digital signals are superimposed on a vertical blanking period of a television and transmitted. This teletext can be viewed by combining the teletext receiver with a television receiver.

FIG. 5 is a block diagram showing an example of a conventional teletext receiving apparatus. Radio waves received by an antenna 1 are selected and demodulated by a tuning / demodulating circuit 2, and a video signal is switched between video and audio. It is supplied to the circuit 3 and the character signal decoder 4. On the other hand, the audio signal component of the signal demodulated by the channel selection demodulation circuit 2 is supplied to the audio demodulation circuit 5.
The audio signal is then taken out.

The video signal or audio signal supplied to the video / audio switching circuit 3 is supplied to the audio amplifier circuit 6 or the video color signal processing circuit 7 according to the instruction signal from the character signal decoder 4 for outputting the video or audio. .

The audio signal amplified by the audio amplifier circuit 6 is emitted by the speaker 8. On the other hand, the video and color signals are converted into the RGB switching circuit 9 and the color output circuit 10.
It is supplied to the color picture tube 11 via the and is displayed. When receiving a character broadcast, the character signal decoder 4 separates and decodes the character signal from the video signal to generate RGB signals of a character screen composed of characters and figures. In addition, additional voice is also generated as needed. A character screen composed of characters or figures is supplied to the RGB switching circuit 9 and displayed on the color picture tube 11 via the color output circuit 10.

[0006]

However, since the character information is inserted from the TV station after being inserted in the vertical blanking period, the character information is stored on the receiving side before being displayed, and the TV station to be selected is selected. If changed, there was a problem that a waiting time of about 20 seconds, which is the time for accumulating character information, was required to display a new character screen.

The present invention has been made in view of such a situation, and it is possible to display a character screen with almost no waiting time even if the television station is changed.

[0008]

In order to solve such a problem, a teletext receiving apparatus of the present invention is a decoder for decoding a teletext signal (text multiplex decoder 22 in FIG. 1).
And at least two tuners (tuner 1 in FIG. 1
3 and 14), the character broadcasting receiver is provided with setting means (CPU 23 and switch 19 in FIG. 1) for setting one tuner for receiving the character broadcasting signal.

One tuner (the tuner 1 in FIG. 1)
When 3) receives the broadcasting station for the main screen and is displaying it, the other tuner (tuner 14 in FIG. 1) receives and decodes the teletext program of the broadcasting station receiving the child screen. .

One tuner (the tuner 1 in FIG. 1)
3 or the tuner 14 of FIG. 1 is characterized in that, while receiving a sub-screen broadcasting station, the tuner receives and decodes a teletext program.

Further, a tuner (tuner 13 or tuner 14 in FIG. 3) for receiving a teletext signal, and a scanning means (CPU 33 in FIG. 3) for selecting to sequentially receive designated teletext programs by the tuner, A storage means (CPU 33 in FIG. 3) for individually storing sequentially received teletext programs is provided.

Further, when the teletext program cannot be received, the table of contents is received.

[0013]

Therefore, according to the present invention, it becomes possible to constantly receive a teletext program sent from a broadcasting station different from the broadcasting station receiving the main screen.

When one tuner is receiving and displaying the broadcasting station for the parent screen, the other tuner receives the teletext program of the broadcasting station receiving the child screen.

When one of the tuners is receiving the sub-screen broadcast station, the tuner receives and decodes the teletext program.

Further, the designated teletext program is selected to be sequentially received by the tuner, and the teletext programs sequentially received are individually stored.

When the teletext program cannot be received, the table of contents is received.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an embodiment of a teletext receiving apparatus. An example of receiving text information contained in a television broadcast signal will be described. Note that FIG.
The same symbols are used for the same parts as. The information transmitted by the television broadcast wave is received by the antenna 1,
The signal distributor 12 supplies the tuners 13 and 14. The two tuners 13 and 14 are controlled by the CPU 23, which is controlled by a signal from the input detection circuit 24 which receives a remote control signal operated by the user or a signal from the key input circuit 25, so as to be tuned to a desired frequency. To be done.

The received radio waves are detected by the detection circuits 15 and 16. The detected video signal is the switch 1
Inputs 7 to 19 to the parent screen control circuit 20, the child screen control circuit 21, and the character multiplex decoder circuit 22. The outputs of the master screen control circuit 20, the slave screen control circuit 21, and the character multiplex decoder circuit 22 are mixed and supplied to the color picture tube 11. The CPU 23 determines the operation state of the user by the input detection circuit 24 or the key input circuit 25 based on the remote control signal.

The CPU 23 controls the input changeover switches 17 to 19 to send necessary signals to the parent screen control circuit 20, the child screen control circuit 21, and the character multiplex decoder circuit 2.
2 can be entered. When the user is not using the child screen function, the CPU 23 allocates one of the tuners 13 or 14 not used for the child screen function to the character multiplex decoder only.

For example, when the tuner 13 is used for the main screen and the sub-screen function is not used, the switch 19 is used.
To the tuner 14 side. Then, the tuner 14 is controlled so that the broadcasting station to which the program to be decoded by the character multiplex decoder circuit 22 is transmitted is received. By doing so, it is possible to receive a teletext program of a broadcasting station different from the broadcasting station receiving on the main screen.

Even when the child screen is displayed, when the child screen is displayed using the same tuner 13 as the parent screen, the output of the tuner 14 is changed by switching the switch 19 to the tuner 14 side. It can be supplied to the character multiplex decoder circuit 22. When selecting a broadcasting station whose sub-screen and main screen are different, for example, the tuner 13 is used as the main screen only and the tuner 14 is used as the sub-screen only. , The selected signal is supplied to the character multiplex decoder circuit 22.

At this time, only the program of the broadcasting station selected on the parent screen or the child screen can be selected, but in a general usage state, the child screen is less likely to be used, so that the sub screen is practically used. Is the tuner 14 in the character multiplex decoder 22.
Will be dedicated to use.

The switch switching process flow of the CPU 23 is as shown in FIG. Here, it is assumed that the tuner 13 is used for the parent screen. In step 121, it is checked whether the child screen is being displayed. If the child screen is not being displayed, as shown in step 122, the switch 19
To the tuner 14 side. In addition, the tuner 14
The channel selection control is performed so that the broadcasting station broadcasting the designated program is received. Then, this process ends.

When the child screen is being displayed, it is checked in step 123 whether the child screen is selecting the same broadcasting station as the parent screen. When the same screen as that of the main screen is selected on the sub screen, the same step 122 as the process when the sub screen is not displayed is performed. That is, the switch 19 is selected on the tuner 14 side, and the designated program is received and decoded.

When the child screen operates independently, that is, when a broadcasting station different from the parent screen is selected, the specified teletext program displays the child screen as shown in step 124. Check if it is the same as the broadcasting station you are receiving with the tuner. If they are the same, the process is the same as the process when the child screen is not displayed, so the process of step 122 is performed. If it is not the same as the broadcasting station receiving on the small screen, as shown in step 125, the input switch 19 of the character multiplex decoder circuit 22 is switched to the tuner 13 side.

After that, as shown in step 126, it is checked whether or not the designated program is in the broadcasting station being received by the tuner 13. If there is a designated program, the program is received as shown in step 127. And decode. If there is no designated program in the tuner 13 used on the main screen, the process is terminated without decoding as shown in step 128.

In step 128, the decoding is not performed this time, but if there is a program similar to the designated program among the programs being received by the tuner 13, the program is decoded. May be. Also, for example, as shown in the table of contents, a program in place of the designated program may be decoded. Further, it may be displayed such that the designated program cannot be decoded.

As described above, if the teletext is always decoded by either the tuner for the main screen or the tuner for the subscreen, it means that the device itself is always receiving the teletext. Even if the broadcasting station is switched, it is not necessary to store the information on the text broadcast again, and therefore the text broadcast can be continuously received.

FIG. 3 is a block diagram showing another embodiment of the teletext receiving apparatus, in which the tuner 1 is automatically and periodically operated.
By switching the receiving broadcast stations of No. 4, it is possible to instantly see the teletext programs of a plurality of different broadcast stations. By continuously updating the contents of the programs of different broadcast stations, The show is shown to the user as if they were receiving it at the same time.

Here, description will be given by taking as an example the case of receiving character information included in a television broadcast signal. FIG. 3 shows FIG.
And the appearance is the same, but the function of the CPU 33 is different,
Since other parts are the same as those in FIG. 1, the operation of the CPU 33 will be described with reference to the flowchart in FIG.

When the tuner 13 is selecting the broadcasting station for the main screen, it is checked in step 221 whether the tuner 14 is usable. Since the operation of this apparatus cannot be performed when the child screen is in use, the subsequent processing is ended. If the child screen is not displayed, as shown in step 222, it is checked whether the user has already designated the teletext program to be received.

If the teletext program is not designated, the contents of the broadcasting station currently being received by the tuner 14 are received as shown in step 233. This index may be received by storing the received index in a memory (not shown) while scanning a plurality of broadcast stations and receiving the index of the multiple broadcast stations. Further, if the reception of the table of contents is unnecessary, any processing such as receiving another program may be performed.

If the teletext program has already been designated in step 222, it is checked in step 223 whether this time is the first process. This is a process for determining whether to initialize a received program number counter for sequentially receiving designated teletext programs. If this is the first time, step 2
As shown in 24, the reception program number counter is initialized and the reception start flag is cleared.

Thereafter, as shown in step 225, it is checked whether the program designated by the user has already been received. If the reception is completed, the received program data is stored in the RAM for storing the program data in the character multiplex broadcast decoder circuit 22, as shown in step 236. In this way, the stored programs can then be retrieved by the user with one touch.

Then, as shown in step 228, the received program number counter is incremented, and step 22
As shown in 9, it is determined whether or not the count value is larger than the designated program number. If it is larger than the designated program number, the received program number counter is cleared as shown in step 230, and step 23
As shown in 1, the flag that started reception is cleared.

If it is determined in step 225 that the reception of the program with the number designated by the user is not completed, step 2
As shown in 26, it is checked whether or not reception is started. If the reception has not started, step 2
As shown at 34, the tuner 14 is set so as to be able to receive the broadcasting station broadcasting the designated program, and the radio wave of the broadcasting station broadcasting the designated program is received. Then, as shown in step 235, the flag that started the reception is turned on, and this processing is ended.

When the reception of the teletext program is already started in step 226, it is checked in step 227 whether a fixed time, for example, 30 seconds has elapsed. This is a measure for proceeding to the reception of the next program when the designated program is not actually broadcast. If the predetermined time has not passed, the program may be broadcast in the future, so this process is ended in order to continue receiving the program until the time has passed.

This fixed time can be set arbitrarily,
Since teletext is often repeated every 20 seconds,
A value of 20 seconds or more is desirable. In this example, when 30 seconds or more has elapsed, the process after the reception program number counter is incremented is performed as shown in step 228 described above.

The teletext program designation set by the user means designating a broadcasting station and a program, and the received program number is a series of numbers assigned to the broadcasting station and the program group by the apparatus of this embodiment. Is a serial number.

The purpose of this embodiment is to explain the means for automatically receiving the character multiplex broadcast programs of different broadcasting stations, and therefore the explanation for the means for the user to watch the stored programs is omitted. However, the viewing means can be easily realized by additionally storing information for identifying the broadcast station when storing the program data in the program data storage RAM inside the character multiplex broadcast decoder.

In this way, it is possible to automatically continue to receive the character broadcast programs of different broadcasting stations designated by the user at a constant cycle, and the user can select the broadcasting station which he or she wants to watch. You can see it immediately with one touch, without doing any of the above.

[0043]

As described above, according to the teletext receiving apparatus of the present invention, one of the two tuners is set to receive the teletext signal. Therefore, even if the broadcasting station to be received on the main screen is changed. It has the effect of always receiving teletext.

When one tuner is receiving the program of the broadcasting station for the parent screen, the other tuner receives and decodes the teletext program of the broadcasting station receiving the child screen. Even if the broadcasting station to be received on the screen is changed, the teletext can be always received.

Further, when one tuner is receiving the sub-screen broadcasting station, the tuner receives and decodes the teletext program, so even if the broadcasting station received on the main screen is changed, It has the effect of always receiving teletext.

Further, since the designated teletext programs are sequentially received by the tuner and the teletext programs sequentially received are individually stored, the set teletext information is always stored. The effect is that any stored program can be displayed immediately.

Further, since the table of contents is received when the teletext program cannot be received, there is an effect that some teletext program information can be obtained.

[Brief description of drawings]

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

2 is a flow chart for explaining the operation of the apparatus of FIG.

FIG. 3 is a block diagram showing another embodiment of the teletext receiving device of the present invention.

4 is a flow chart for explaining the operation of the apparatus of FIG.

FIG. 5 is a block diagram showing an example of a conventional teletext receiving device.

[Explanation of symbols]

 1 antenna 2 channel selection demodulation circuit 3 video / audio switching circuit 4 character signal decoder 5 audio demodulation circuit 6 audio amplification circuit 7 video color signal processing circuit 8 speaker 9 RGB switching circuit 10 color output circuit 11 color picture tube 12 signal distributor 13, 14 tuners 15 and 16 detection circuit 17 to 19 input selector switch 20 parent screen control circuit 21 child screen control circuit 22 character decoder circuit 23 and 33 CPU 24 input detection circuit 25 key input circuit

Claims (5)

[Claims] 1. A teletext receiving apparatus having a decoder for decoding a teletext signal and at least two tuners, comprising a setting means for setting one tuner for receiving the teletext signal. Receiver. 2. The method according to claim 1, wherein when one tuner is displaying the broadcast of the broadcasting station for the main screen, the other tuner receives and decodes the teletext program of the broadcasting station receiving the child screen. Character teletext receiver. 3. A teletext receiving apparatus, wherein one tuner receives and decodes a teletext program when the tuner is receiving a sub-screen broadcasting station. 4. A tuner for receiving a teletext signal, a scanning means for selecting a designated teletext program to be sequentially received by the tuner, and a storage means for individually storing the teletext programs sequentially received. A teletext receiving device comprising: 5. The teletext receiver according to claim 4, wherein the teletext reception is performed when the teletext program cannot be received.