JPH02146884A - Teletext receiver - Google Patents

Abstract

PURPOSE:To reduce a trouble of program retrieval by selecting other channel while an index pattern of a channel is observed, receiving and storing the index pattern, displaying the channel after the index pattern of the first channel. CONSTITUTION:A data fetched to a receiver is stored in a buffer RAM 15. A CPU 16 reads a data from the RAM 15, reads a program number and processes the required program data according to a program of a program ROM 17. This is applied similarly to the index pattern, the CPU 16 seeks the index pattern based on the program number among the program data fetched one after another to apply required operation to the display and the result is outputted to a monitor means via a control circuit 19 and a picture memory 20. When the reception of the index pattern data of one channel is confirmed by the CPU 16, the index pattern of the next channel is fetched and stored in a memory 25, and the viewer reads and observes the next pattern with key operation after the initial index pattern is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a teletext receiving device that improves operability when searching for a program.

(Prior Art) Teletext broadcasting is a system in which image information consisting of characters, graphics, and additional sounds is encoded and multiplexed onto television broadcast waves in the form of digital signals for broadcast. On the receiving side, when the viewer specifies the program number of the teletext program he or she wants to watch to the teletext receiver, the program corresponding to the designated number of the reception channel 1 is displayed on the screen of the television receiver.

The teletext signal is transmitted in a superimposed manner as shown in FIG. 7 during the horizontal scanning period within the vertical blanking period of the television video signal. As shown in FIG. 7, the teletext signal is composed of a synchronization section and data packets. The synchronization part is
It consists of a clock run-in for bit synchronization in the teletext receiver and 7 framing codes for establishing byte synchronization and extracting the data bucket part. A data packet consists of a bfix for data identification, a check code for data error correction, and a data block for display on an actual screen.

FIG. 8 is a block diagram of a television receiver including a teletext receiving section.

In FIG. 8, television radio waves received by an antenna 1 are demodulated by a tuner and a video detection unit 2, and the image signal obtained there is sent to a video amplification and color demodulation unit 3 where it is demodulated into three primary color signals, and a switch Color via SW1 RT4
input to the three-axis cathode. Further, the audio signal from the circuit section 2 is sent to the audio IF section 5 for IF amplification and FM detection, and is amplified by the audio amplification section 6 via the switch SW2 and outputted as audio from the speaker 7. On the other hand, the teletext data superimposed on the image signal from the circuit unit 2 is extracted by the teletext receiver 8 and developed into image data and audio data, and the image signal is supplied to the color RT4 via the switch SW1.
The audio signal is input to the audio amplification section 6 via the switch SW2. The switches SW1.8W2 are used to switch between displaying characters and graphics on the entire screen by switching to the television screen, or to display characters and graphics superimposed on the television screen.

FIG. 9 is a block diagram showing the configuration of the teletext receiving section.

In FIG. 9, the video signal demodulated by the circuit section 2 in FIG. 8 is input to a waveform equalization circuit 11. Waveform equalization circuit 11
After improving the effects of ghost etc., slice circuit 1
2 converts it into a digital signal, the data import circuit 13 takes in the character data, and the received data is sent to the buffer RA.
Store in M15. The output end of the data acquisition circuit 13 is connected to the data bus 14. Thereafter, the data acquisition circuit 13 outputs an interrupt signal to the CPtJ 16 to notify that new data has entered the buffer FRAM 15. The CPU 16 that received this uses the buffer RAM 1
5 and performs processing according to the contents of the program ROM 17 for information determined to be necessary. At this time, if the image data to be displayed is, for example, character data, it is developed into a pattern with reference to the keyboard ROM 18 and is written into the image memory 20 via the display control circuit 19, and the music data is stored in the music synthesizer 1f21. Output to. The data written in the image memory 20 is read out by the display control circuit 19 and output as image data to the color CRT 4 shown in FIG. 8.

In addition, the music data is converted into an analog music signal by the music synthesizer 21, and after being amplified by the amplifier 22,
The signal is output to the audio amplification section 6 in FIG.

When attempting to obtain information using the teletext receiver as described above, the user manually inputs a program number corresponding to the desired information using a remote control key or the like.

When the program number key is pressed, the CPU 16 receives the program number from the key input interface 23 shown in FIG. 9, searches for the desired data from the data loaded into the buffer RAM 15, and displays it on the screen. Alternatively, processing such as music generation is performed. In this case, the CPU 16 can confirm the program number of the received data from the information included in the data block.

By the way, when attempting to obtain information by specifying a program number in this way, it is necessary to know in advance what kind of information can be obtained by which channel and which number. Therefore, in teletext broadcasting, it is possible to know the contents of the broadcast from a table of contents screen sent with a number determined for each channel.

The table of contents screen shows simple program contents, such as whether the program is news or a weather forecast, and the program number corresponding to each program. When trying to obtain information via teletext, first look at this table of contents screen for each channel, then
A common method is to specify a desired program from among them.

Therefore, in order to search for the desired program, the viewer has to check each 1? You need to look at the contents screen of the channel. This requires the viewer to repeatedly switch channels and call up the table of contents screen. In such cases, since each teletext program is sent in a time-sharing manner, it may take several seconds to get the desired program, and even if you specify the table of contents screen, the table of contents screen will not appear immediately. is not always displayed, and the repeated operations of switching channels and calling up the table of contents screen become extremely difficult work.

(Problem to be Solved by the Invention) As mentioned above, in the conventional teletext receiving device, when searching for a program, the user has to repeatedly switch channels, call up the table of contents screen, and display it, resulting in very poor operability. There was a problem.

Therefore, the present invention is intended to eliminate the above problems.
It is an object of the present invention to provide a teletext receiving device that can reduce troublesome operations when searching for programs.

[Structure of the Invention] (Means for Solving Problem yI) A first invention related to this teletext receiving device captures a teletext signal from a television video signal on which a teletext signal is superimposed during a vertical retrace period. , a capture means for storing in a buffer memory, a channel switching means for switching the reception channel of the teletext signal to be captured, and a table of contents program received from among the program data captured by the capture means, and a table of contents for the first channel. a first control means that controls to automatically switch to a second channel by the channel switching means and start receiving the table of contents program of the second channel when the reception of the program is finished; a storage means for sequentially storing the table of contents program of each channel received by repeated control of the control means; and a storage means for sequentially switching and reading out the table of contents program of each channel stored in the storage means based on a key designation; A second control means for controlling writing in an image memory and displaying on a screen, and a display means for displaying a teletext program on a screen, and under the control of the second control means, a table of contents program of a specific channel is displayed. is characterized in that data of the table of contents program of each channel is stored in the storage means while repeating the control of the first control means, regardless of the channel from which the displayed program is transmitted. be.

Further, in the teletext receiving device of the first invention, when desired information is found in the displayed table of contents screen while displaying a table of contents program of a specific channel, an instruction to receive the program is provided. When this is performed on the receiving device, the number of the channel that is transmitting the display contents screen is read from the storage means, and the channel switching means is instructed to automatically switch to that channel and display the designated program on the screen. The present invention is characterized in that it includes a third control means for controlling.

(Function) In the present invention, while viewing the table of contents screen of a certain channel, it automatically switches to another channel, receives and stores the table of contents screen of that channel, and displays the table of contents screen of the first channel. After you have finished viewing the table of contents, for example, simply by pressing the table of contents switch key, you can display another channel that has been memorized in advance, saving you the trouble of switching from the table of contents screen of one channel to the table of contents screen of the next channel. It can save time.

(Example) The present invention will be described below based on the example shown in the drawings.

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

In this figure, the same components as in FIGS. 8 and 9 are given the same reference numerals. The difference from the conventional example is that a channel storage register 24 is provided which is connected to the key manual interface 23 and stores channel switching information, and a table of contents program memory 25 which is connected to the data bus 14 and stores table of contents screen data. This is because we have established the following. Here, the table of contents screen refers to a screen of a table of contents program that shows the program number and program content (ie, program index) in the teletext broadcast of each channel. The other configurations are the same as the conventional example.

Note that the key human power interface 23 is connected to the data bus 14 of the teletext receiving section and to the tuner and video detection section 2, and is connected to the data bus 14 of the teletext receiving section, and also to the tuner and video detection section 2. )
is judged by the key human power interface 23, and the CPU controls the channel switching of television broadcasting and the teletext control data.
Controls transmission to 16, etc. When changing channels, this key manual interface 23 stores the changed channel number in a channel storage register 24, so that the current channel change can always be known. CPU 16 is the key human power interface 23
You can switch channels and know the current channel number via .

Next, the general operation of this embodiment will be explained.

As explained in the conventional example, data taken into the receiver is stored in the buffer RAM 15. The CPU 16 reads data from the buffer RAM 15, reads the program number from the data, and assigns the program R to the necessary program data.
Processing is performed according to the OM17 program. Table of contentsli!
! The same goes for the i-side data, and the CPLJ 16 finds the table of contents screen from among the program data that is imported one after another based on the program number included in the data, converts the character code into pattern data using the character ROM 18, etc. After performing the necessary operations, display the data91
The data written into the image memory 20 via the 111 circuit 19 is read out by the display control circuit 19 and sent to a monitor means such as a color CRT. Here, when the CPU 16 confirms that all the table of contents screen data of one channel has been received, the channel is automatically switched, the operation of importing the table of contents screen data of the next channel is started, and the data is transferred to the table of contents program. It is stored in the memory 25 for use. And this table of contents program memory 2
By reading out the information from 5, the viewer can view the next table of contents screen by a simple operation such as pressing the table of contents change key after viewing the first table of contents screen. Note that the program number assigned to the table of contents screen is usually fixed for every channel (for example, 1#), so if you memorize this number, the receiver can immediately start each program without entering the program number on the table of contents screen. You can start receiving the channel's table of contents screen.

FIG. 2 shows an example of the structure of the table of contents program memory 25. As shown in FIG. As shown in FIG. 2(a), the received table of contents screen data of each channel is stored in the table of contents program storage area (1).
, (2), (3),... AAAA, BBBB, CCCC,
... indicates the start address of each storage area. In addition to the table of contents screen data, each table of contents program storage area also contains a channel number area indicating which channel the table of contents screen data belonged to, and the end of reception of the table of contents screen data, as shown in Figure 2(b). A data damage completion status area is provided to indicate the status of data damage.

The flowchart of the operation of the receiver configured as above is shown in the fourth section.
As shown in FIG. Figure 3 shows the relationship between the main routine and the interrupt routine in the flow of operations, and Figure 4 shows the flow of the main routine in Figure 3, and this main routine mainly displays the received table of contents screen data. It's a flow. Further, FIG. 5 shows the flow of the interrupt routine in FIG. 3, and this interrupt routine is a flow for receiving table of contents screen data. CPU1
6 is normally processing the main routine shown in Figure 4, and when an interrupt from the data acquisition circuit 13 occurs, the processing of the main routine that was being executed up to that point is interrupted and the processing of the interrupt routine is executed. However, after the interrupt processing is completed, the main routine processing is resumed.

In FIG. 4, "Press Table of Contents key" in step S1 means that the key for requesting the start of searching the Table of Contents screen is called the Table of Contents search key, and this key is pressed by an external keypad or the like. This means that the table of contents screen search has started.

When this key is pressed, the table of contents screen data read address register and write address register are initialized (step 82). As both of these registers, registers in the CPU 16 may be used, or free areas in either the memory 15 or 25 may be used. Both of these registers normally contain the start address of the table of contents screen data storage area (to AAA in Figure 2, BBBB, .
etc.) is set to 1. Step S2 initializes both registers, so in the example shown in Figure 2, AA
Set AA. The reason for displaying each channel number in the header section in the next step S3 is that if you look at the display example during double-sided table of contents search in Figure 5, all channel numbers will be displayed in the area called the header section of the display screen. It means to display the following.

This channel number display is used to cover the channel on which the reception of the table of contents program (that is, the reading of the table of contents screen data into the table of contents program memory 25) so that the viewer can understand. When the reception is finished, by changing the color of the back of the number 1, 'lA listeners are informed that the reception of the table of contents program of channel 1 is finished. The next step S4 is a waiting state for receiving table of contents screen data.
At this time, the table of contents screen data read address register is waiting for data to be written into the storage area of the memory 25 for the first table of contents program.

Detection of completion of writing of the table of contents screen data (ie, detection of completion of reception) is performed by checking the write completion status of the table of contents program memory 25. When it is confirmed that the table of contents screen data has been received in the table of contents program memory 25, the CPU 16 reads out the table of contents screen data and displays it on the screen (step 35).

If the viewer who viewed the display screen does not find the desired information in the displayed table of contents program, the viewer presses the table of contents switch key provided to switch the table of contents screen to the table of contents screen of another channel (steps S6 and S7). ). After confirming that this key has been pressed, the CPU 16 updates the memory contents of the table of contents screen data read address register.
AA address is changed to BBB8 address), and the table of contents screen data of the next channel is received (step 88).
).

At this time, both display surfaces remain as they are until the next screen is displayed. If the desired program is found in the table of contents program during the table of contents screen search, the viewer can specify the table of contents search by inputting the program number of the desired program, as shown in steps 89 to S12. The channel number corresponding to the table of contents program is read from the record 4amR in the table of contents program memory 25 where the desired information is found, and the CP
U16 issues an instruction to the key human interface 23 to switch channels, and returns to the conventional operation of receiving the designated program.

The above is the flow of the main routine. When the CPU 16 receives an interrupt from the capture circuit 13 during the main routine operation, the CPU i 6 shifts the processing operation from the main routine to the interrupt routine. As shown in FIG. 6, in step 821, first, receive t! Check whether teletext is superimposed on the channel. This check can be performed by detecting the presence or absence of the framing code shown in FIG. If teletext is superimposed on the receiving channel, switch the receiving channel (step 3).
28), can handle interrupt routines. If there is overlap, as shown in steps S22 and S23, the buffer RAM
15, and if the number 1 of the received data matches that of the table of contents program, that data is stored in the storage area in the table of contents program memory 25 starting from the address indicated by the table of contents screen data write address register. Forward. Then, in step S24, the received data includes not only the program number but also information indicating the number of data pages, etc., but if the received data is still incomplete judging from such information, exits the -degree interrupt routine and obtains the remaining data from subsequent acquisition data.

If all data has been received in step S24, the background color of the display number in the header area shown in FIG. 5 corresponding to the channel number at that time is changed (indicated by diagonal lines), and the viewer is informed It is notified that reception of the table of contents screen for that channel has ended (step 525). The channel number is read from channel storage register 24. Next, as shown in steps 326 and 827, the channel number and reception completion status are entered in the storage area shown in FIG. 2(b), and the contents of the table of contents screen data input address register are updated. For example, until then AAA
If it indicates address A, change it to address BBB8.

Finally, the CPU 16 issues an instruction to switch the channel to the key human interface 23, and the receiving channel is switched (step 828). At this time, the contents of the channel storage register 24 are also updated.

According to the above embodiment, while a viewer is watching a table of contents program on a certain channel, data for a table of contents program on another channel can be automatically received and stored in the table of contents program memory. When switching the display of the table of contents screen, it is only necessary to use the information stored in the table of contents program memory in advance, which reduces the time required to change the table of contents program and also eliminates the trouble of switching channels. can.

[Effects of the Invention] As described above, according to the present invention, it is possible to reduce the troublesome work of switching channels, calling up and displaying the table of contents screen when searching for a program, and the time required for searching for a program can be significantly reduced. Can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a teletext receiver according to an embodiment of the present invention, Fig. 12 is an explanatory diagram showing the configuration of the table of contents program memory in Fig. 1, and Fig. 3 is the main operation when searching the table of contents screen. Explanatory diagram showing the relationship between routines and interrupt routines, No. 4
The figure is a flowchart explaining the main routine centered on displaying the received table of contents screen data, Figure 5 is an explanatory diagram showing an example of the screen display when searching the table of contents screen, and Figure 6 is for receiving the table of contents screen data. 7 is an explanatory diagram explaining the structure of a teletext signal, FIG. 8 is a block diagram showing a teletext receiving system, and FIG. 9 is a block diagram showing a conventional teletext receiving unit. It is a diagram. 2... Tuner and video detection section, 11... Waveform equalization circuit, 12... Slice circuit, 1
3...Data acquisition circuit, 14...Data bus,
15... Buffer RAM, 16... CPU. 17...Program ROM. 18...Character ROM. 19... Display control circuit, 20... Image memory, 21
...Music synthesizer, 23...Key manual interface, 2/I...Channel storage register, 25...Table of contents program memory. Figure 2 Main Lunarso Figure 3 Figure 5 Figure 4 Figure 6

Claims (2)

[Claims] (1) a capture unit that captures a teletext signal from a television video signal on which a teletext signal is superimposed during a vertical retrace interval and stores it in a buffer memory; and a channel switching unit that switches the reception channel of the teletext signal to be captured; When the table of contents program is received from among the program data imported by the importing means and the reception of the table of contents program of the first channel is completed, the channel switching means automatically switches to the second channel, and the table of contents program of the second channel is automatically switched to the second channel by the channel switching means. a first control means for controlling the start of reception of the table of contents program; a storage means for sequentially storing the table of contents program of each channel received by repeating the control of the first control means; a second control means for sequentially switching and reading out the table of contents programs of each channel stored in the means based on key designations, writing them to the image memory and displaying them on the screen; and a display for displaying teletext programs on the screen. means, under the control of the second control means, even when a table of contents program of a specific channel is displayed, regardless of the transmission channel of the displayed program, the control of the first control means is repeated, and the storage means is A teletext receiving device characterized by storing data of a table of contents program of each channel. (2) In the teletext receiving device according to claim 1, when desired information is found in the displayed table of contents screen while displaying a table of contents program of a specific channel, an instruction to receive the program is given to the receiving device. and a third control device that reads the number of the channel transmitting the display table of contents screen from the storage means, instructs the channel switching means to automatically switch to that channel, and controls to display the specified program on the screen.
What is claimed is: 1. A teletext receiving device characterized by comprising a control means.