JPS5831687A - Display data control circuit - Google Patents

Abstract

PURPOSE:To sum readout data from an ROM and to obtain a program number list display screen in a pattern picture such as characters and graphs, by using readout data of a picture data assembling and storing pattern data and readout address data of a character code ROM. CONSTITUTION:A program code is interpreted with a microcomputer 15, display data relating to a program are stored in a picture memory 23 via bus controllers 17 and 18, and the address of a memory 23 is designated via a bus controller 16. The code of the program number interpreted at the computer 15 is written in an address memory 21 via the controller 17, and the code stored in the memory 21 is used for address designation of a character ROM22. The display data such as characters and graphs is outputted from the memory 23 and inputted to an adder 26, where the data is summed with the content of a program list of a reception channel of multiplex broadcast from the ROM22, allowing to display the display picture of program number in the picture such as characters and graphs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a round display data control circuit for displaying characters, figures, etc., and is effective for use in, for example, an II/system for receiving television teletext broadcasting. be.

In teletext broadcasting, the fii of the television signal of one channel [in a specific horizontal scanning period of the retrace period,
Multi-program programming, graphics, and control (1 rich digital fit)
The signals are superimposed and transmitted.

From among the teletext broadcasts transmitted in this way, the receiving side selects one channel and selects the desired program, thereby receiving the text related to that program,
Image display based on graphics, control signals, etc. can be performed.

This type of teletext signal processing system is usually configured as shown in FIG. gt In the diagram, ll is a video signal input terminal, and this video signal input terminal 11
From among the nine video signals input to the character multiplex signal part tb
The teletext packet is extracted by the sampling circuit 12, converted into parallel data by the serial-parallel conversion circuit 13, and inputted to the post-parallel buffer circuit 14. Zero sampling is performed during a specific horizontal running period within the vertical retrace period. Therefore, the data for that period is temporarily stored in the buffer circuit 14.

Now, if the Ruru program is specified on the receiving side, the code indicating that program (present in the buffer circuit) is decoded by the microcomputer 15, and the display data related to the program is displayed. Only the data is stored in the image memory 23 via the bypass capacitors) 0-217 and the data bus DB1 and the bypass capacitors 91&. On the other hand, at this time - great memory 23
The write address is specified by the microcomputer 15 via the bus controller 16 and the address memory B1.

To specify the write address of image memory z3,
Control data transmitted regarding the program is stored in the RAM in the microcomputer 15, and a designated address is generated by the program based on this control data.

As described above, the display data related to the program designated by the receiving side is accumulated one after another in the image memory 23, and pattern display data for obtaining a display image is assembled. After this assembly is completed, display processing is performed, but at this time,
The read address of the image memo 1J23 is specified by address designation data from the video address kakunta 19 synchronized with the screen scanning of the receiver being displayed. At this time, the bypass controller 1) 16 separates the address buses on the microcomputer 15 side and the image memory 23 side, and during the display period, the microcomputer side operates independently.

The display data read from the image memory 23 is sent to the display control unit 24 via the data bus DB:. In the display control section 24, the display data is decoded and converted into a parallel/serial converter, and the output thereof is inputted to the video circuit. At this time, I want to use data pan Dlls and DB.
It is separated from s by bassoon) a-218.

On the other hand, in teletext broadcasting, data related to multiple programs is sent on one channel, so the program number corresponding to each program currently being transmitted may be sent in a hood format in which the program number is converted to 111 in advance. . When the encoded information of the program number is sent, the following considerations are made. When a certain thing is decoded, the code for that program number is written into the address memory 21 via the T-bus controller 17.

The write address at this time is the address bus
Specified via l. Program II4 stored in this address memory z, l! The code for is character ROM2
2 is used for addressing. That is, if you try to display the program number of the program currently being transmitted, the program number display operation is performed from the keyboard. In response to the control l signal from the chip select line 25, the program number hood in the address memory 21 is read out by the output of the video address kakunter 19, and is read out from the character ROM 32.
Specify the address of. The nine-syllable pattern data read out by this addressing is sent to the display control unit 24 via the data bus DBs.

As described above, according to the conventional XI display data control circuit, when reading the contents of the character ROM 22 and displaying the program number, and when reading and displaying the pattern data of the image message 23, Data bus Dea
I am sharing. Therefore, it is necessary to inhibit the data output of either one of the two systems, and the data of both systems can be simultaneously transferred to the data bus DB using the message chip select signal.
4. I try not to sit on top of it.

However, there is a desire for users to be able to simultaneously view the butter/data of the picture message 1J23 and what kind of program number is currently being transmitted.

Also, if you specify a program number that is not currently being transmitted and are waiting for it to be displayed, if that pattern is not obtained, a malfunction will occur.
the program number display state, or independently switch to the program number display state to confirm.

The present invention has been made in order to cope with the above-mentioned circumstances, and uses a code as read data from an image memory that assembles and stores pattern data by transmitting pattern information, and as read address data of a character ROM by transmitting encoded information. The object of the present invention is to provide a display data control circuit that obtains a program book list display image in a pattern image of characters, figures, etc. by providing a data adder that adds data read from the character ROM. shall be.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of the present invention, and the same parts as in FIG. 1 are denoted by the same reference numerals. The data output from the character ROM 22 is sent to the first input terminal group of the data adder 26 via the data bus DBm.
to the second input terminal group of the data adder 26. In this data addition 1s26, for example, a portion of the pattern data from the image memory 23 is erased, and data from the character ROM 22 is added to the erased portion. The output of this data adder 26 is then applied to the display control section 24. The operations of the parts common to FIG. 1 are the same as those described above. 41 of this circuit!
The important part is that the data adder 26 is provided, and as shown in Figure @3, the display screen 30 displays an image 31 (e.g. map) based on the display data from the image memory 23, and Program number group 32 being sent on this channel (e.g.
1, 2, 3.4.5.8) are obtained by, for example, multi-screen display processing.

FIG. 4 shows the contents of the character ROM 22 and the image memory 2.
This is an example of the data adder 26 in the case where the contents of 3 are superimposed by one horizontal line, and the bit data corresponding to the horizontal direction from both sides is inputted to an OR circuit and output.

The display example in this case will depend on the size of the display pattern in the ROM 22, but for example, as shown in FIG. Data that adds read data from an image memory that assembles and stores pattern display data through transmission, and data that is read out from a character ROM by using a code sent through encoded information transmission as read address data of the character ROM. By providing an adder, it is possible to provide a display data control circuit for obtaining a program number list display image in a pattern image of characters, figures, etc.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a conventional display data control circuit; FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention; FIGS. 2 is an explanatory diagram showing an example of display by the circuit of FIG. 2, and FIG. 4 is a circuit diagram showing an example of the data adder of FIG. 2. 15...Microcomputer 16.17.18...Path controller 19...Video address counter 21...Address memory 22...Character ROM 23...Image memory 24...Display control unit 26...Adder

Claims (1)

[Claims] (iii) storing pattern display data by accumulating data sent as pattern information such as 11 characters and figures
a memory, an address memory that stores the code sent as encoded information, and outputs display data such as characters, figures, etc. by reading out from this address memory and specifying a special address for the code. Character RO
1. A display data control circuit characterized in that it comprises a data adder that adds data read from the lIigI memory and the character ROM. (2) The pattern display data stored in the image memory is sent by teletext, and the program content is 〈〉, and the data read from the # start character ROM is the program number on the receiving channel of the cough teletext. The display data control circuit according to claim S, wherein the display data control circuit is a list of contents.