JPH01309587A - Teletext receiver - Google Patents

Abstract

PURPOSE:To display an arbitrary program and to simultaneously display a selective program or another program correlative with the arbitrary program by storing character broadcasting data, decoding the data, and displaying an updated character broadcasting picture on a designated position out of plural display positions of a display part. CONSTITUTION:The program numbers and the updating flags of the character broadcasting data sampled in a character signal sampling part 1 are respectively compared with the program numbers and the updating flags stored in program number storing means 17, 19, 21 and 23 and updating flag storing means 18, 20, 22 and 24, and when they are coincide with each other, the character broadcasting data are decoded and displayed on the designated position out of the plural display positions of a display part 8. Further, when the updating flags are updated, the character broadcasting data are stored and decoded, and the updated character broadcasting picture is displayed on the designated position out of the plural display positions of the display part 8. Thus, a separate program number can be set for each divided picture, and a content program and either the selective program or an individual program correlative with the content program can be displayed simultaneously on the picture.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a receiver for teletext broadcast multiplexed with television radio waves.

BACKGROUND OF THE INVENTION Most of the teletext broadcasts currently being broadcast in Japan are targeted at so-called Level A teletext receivers.

Teletext is not a two-way communication system like Videotex such as Captain, but uses multiple superimposed H (horizontal scanning periods) of TV radio waves, and multiple programs are cycled in 20 to 30 seconds. This is a system in which the information is sent after being sent.

Hereinafter, a conventional teletext receiver will be explained using FIG. 4. In the figure, reference numeral 1 denotes a character signal extraction section for extracting a character signal from a video signal from a video signal input section A. 2 is a clock generator for generating various reference signals. 3 (well, this is a control unit for performing various controls for receiving and displaying teletext). 4 is a key human power unit for making various requests such as selecting a teletext program.

5 is a video RAM for actually displaying processed character signals. Reference numeral 6 denotes an address switching section for switching between the address signal from the control section 3 and the display readout address signal from the clock generator 2. Reference numeral 7 denotes a video converter that converts the signal read out for display from the video RAM 5 into a video signal using a synchronizing signal from the clock generators 2 and the like. Reference numeral 8 denotes a display such as a CRT for actually displaying the signal from the video converter 7. 9
is a program number register that stores the program number selected from the key input section 4. 10 is an update flag buffer for storing the content, which determines whether or not the previously received content has been updated by using an update flag in the character signal when a program that has been received twice is received again. be. This is particularly effective for -page format programs, or when even the page of the program is specified.

Reference numeral 11 denotes a PLP buffer for extracting a program requested by the key human power section 4 from the character signal extraction section 1 and buffering the data in order to process the data based on PLP (Presentation Level Protocol). Reference numeral 12 denotes a character generator that stores character fonts based on character codes when performing display processing based on PLP.

Next, its operation will be explained.

The program number selected and input from the key human power section 4 is input to the control section 3.
and stored in the program number register 9. The control unit 3 performs processing as shown in FIG. In the program loading process, the program number stored in the program number register 9 is retrieved from the teletext data, the update flag is loaded into the update flag buffer 10, and the data necessary for displaying the teletext data is transferred to the PLP buffer 11. write to.

Next, in the PLP display processing in the control section 3, valid data in the PLP buffer 5 and buffer 11 are processed, character fonts are read out from the character generator 12, and the display contents are written into the video RAM 5.

Next, when the same program is received again, the program format, selection mode, and rewrite flag are determined, and if necessary, the contents of the update flag and the previous update flag are stored in the update flag buffer 1.
It is determined from 0 and a decision is made regarding updating or rewriting.

Problems to be Solved by the Invention In such conventional teletext receivers, when a table of contents program is selected for program selection, the currently displayed program is erased and the table of contents program is displayed. If you select the desired program again from the contents of the table of contents program, the table of contents program will be deleted and the selected program will be displayed.

As described above, conventional teletext receivers have a problem in that even when using mutually related programs, the screen is repeatedly erased and displayed, making it difficult to use.

Furthermore, unlike Videotex, the excellent characteristic unique to teletext broadcasting, in which programs with adjacent program numbers can be instantly selected using the ■, e6, and Z keys, cannot be fully utilized due to the above limitations. There was a problem.

The present invention can solve the above-mentioned conventional problems, and provides a teletext receiver that can be used while displaying an arbitrary program, a selected program, or simultaneously displaying mutually related programs.

Means for Solving the Problems A teletext receiver according to the present invention includes a character signal extracting section for extracting teletext data from a video signal, a program number storage means for storing a plurality of program numbers, and an update flag for the program. an update flag storage means for storing, a teletext data storage means for storing the teletext data extracted by the character signal extracting section, and a teletext image corresponding to each display position divided into a plurality of the display section. A decoding means including a storage means and a means for selecting and specifying a plurality of display positions on the display section are provided, and the program number and update flag of the teletext data extracted by the character signal extraction section are stored in the program number storage means and the update flag respectively. The teletext data is compared with those stored in the storage means, and if they match, the teletext data is decoded and displayed at a designated position among the plurality of display positions on the display unit, and the update flag is updated. If so, the teletext data is stored, decoded, and an updated teletext image is displayed at a designated position among a plurality of display positions on the display section.

According to the present invention, by setting the cursor indicating one of the individual positions where the display screen is divided by the above-described means to an arbitrary divided screen position, the program number that is independent of each divided screen can be displayed. This makes it possible to simultaneously display a table of contents program and selected programs or mutually related individual programs on one screen.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a block diagram of a teletext receiver according to an embodiment of the present invention. Note that in FIG. 1, components having the same numbers as those in the conventional example shown in FIG. 4 have the same functions, and detailed explanations will be omitted.

Reference numeral 15 denotes a control unit that has the same control function as the control unit 3, and additionally has a program for realizing a new function (based on the purpose of the present invention).

Reference numeral 16 denotes a character signal data buffer that stores the teletext data extracted from the character signal extraction section 1.

17 is a program number register that stores the program number displayed at screen display position 1 when the screen of the display 8 is divided into four as shown in FIG.

Reference numeral 18 denotes an update flag buffer that stores update flags of programs displayed at screen display position 1.

Below, the program number register 19 and update flag buffer 20
, the program number register 21 and update flag buffer 22, and the program number register 23 and update flag buffer 24 are the program numbers corresponding to display positions 2, 3, and 4, respectively. be. Display position 1.2.
3 and 4 indicate the positions when the display area of the video RAM 5 is divided as shown in FIG.

25, there is something corresponding to program number registers 19, 21, 22 and 23 in the teletext data extracted by the character signal extraction unit 1, and rewriting is determined based on the data, and if necessary, the update flag buffer is 18.20.22 and 24, the update flag is determined, and the reception pointer has a pointer that cycles through the display positions 1 to 4 and whether or not there is an update/rewrite for each display position. A specific example is shown in FIG. If there is received data, the corresponding bit is set to "1" and starts from reception position 1, progresses one step for each processed data, and then cycles from 1 to 4.

26 is a character generator which has the functions of the character generator 12 as well as a character font group suitable for the split screen shown in FIG.

27.2B, 29, and 30 are display positions 1.2.3
and PLP buffer for buffering the data for PLP processing corresponding to each of 4. To 10. - A buffer dedicated to each display position is required for displaying batch programs, etc.

Reference numeral 31 denotes a cursor position register that stores the position of the cursor among display positions 1 to 4.

32 is a display status register indicating whether the display of one program has been completed or is in progress.

An example of operation will be described below.

By setting the triangular cursor shown in FIG. 2 to an arbitrary position using the key operator 4, the display position becomes a program selectable position, and the program can be selected from the key operator 4. When the cursor position is moved one after another by the key manual unit 4, the contents of the cursor position register 31 are also changed, and the program number register 17.1 corresponding to each position is changed.
Can be set to 9.21 and 23.

The teletext data extracted by the character signal extraction section 1 is stored in the teletext data buffer 16 via the control section 15. During this data storage process, the program number register 17.1
9. If there is a program number matching the received program number in either 21 or 23, the corresponding bit of the reception pointer 25 is set.

If the display status register 32 determines that the display is complete, the reception position pointer of the reception pointer 25 starts from display position 1, determines whether or not there is received data, and
If there is, the data of the corresponding program is transferred from the character signal bar 16 to the PLP buffer 27, and the display status register 32 is set to indicate that it is being processed.

When the register 32 is being processed, the control unit 15
P processing is started, the data from the PLP buffer 27 is processed, a character font suitable for the split screen is read from the character generator 26, and the data is stored in the video RAM 5.
The teletext screen is stored in display position 1. When the display processing is completed, the display status register 32 is reset.

When this register 32 is reset, the bit indicating the presence or absence of received data in the reception position pointer 26 is reset.
The reception position pointer 25 advances by one.

If there is received data at the next display position 2, the above process is repeated and the teletext screen is stored at the corresponding display position in the video RAM 5. If there is no received data, the reception position pointer 25
Recommend one and perform the same process. Even if the received data presence/absence bit is reset in PLP processing, the next time data with the same program number is received, the update flag is determined by update flag registers 18, 20, 22, and 24, and if there is an update, it is set again. be done. Similar processing is repeated.

Effects of the Invention According to the present invention, it is possible to request independent program numbers in individual display areas divided on the same screen based on the cursor display, and it is also possible to display selected programs while displaying the table of contents program. Furthermore, individual programs with different related program numbers, such as multiple stock programs, multiple weather forecast programs for national, local, weekly, etc., can be displayed on the same screen, and each program can be displayed independently. It is possible to provide a teletext receiver that has an extremely excellent update effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a teletext receiver according to an embodiment of the present invention, FIG. 2 is a front view showing an example of screen division and a cursor display example of the present invention, and FIG. 3 is a format showing a specific example of a reception pointer. 4 is a block diagram of the conventional example, and FIG. 5 is a flowchart showing the processing flow in the control section. 1...Character signal extraction unit, 15...Control unit, 16...Character signal data buffer, 17.
19.21.23...Program number register, 18
．． 20.22.24...Update flag buffer,
25...Reception pointer, 27.28.29.3
o...PLP buffer, 31...cursor position register. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
Figure (α) Lotus dress! Missing (b) Interrupt a

Claims (1)

[Claims] a character signal extraction unit that extracts teletext data from a video signal; a program number storage unit that stores a plurality of program numbers; and an update flag storage unit that stores an update flag of the program;
a decoding means including a teletext data storage means for storing the teletext data extracted by the character signal extraction section, and a storage means for storing the teletext image corresponding to each display position divided into a plurality of display parts; and means for selecting and specifying a plurality of display positions of the display section, the program number and update flag of the teletext data extracted by the character signal extraction section being stored in the program number storage means and update flag storage means, respectively. If they match, the teletext data is decoded and displayed at the specified position among the multiple display positions on the display section, and if the update flag has been updated, the teletext data is A teletext receiver that stores and decodes an updated teletext image at a designated position among a plurality of display positions on a display unit.