JPH066705A - Text broadcasting receiver - Google Patents

Abstract

PURPOSE:To convert the background color of a display cursor into a color different from that of text broadcasting so as to easily identify the cursor by switching a background color outputted from an image display memory by a gate pulse to display a cursor. CONSTITUTION:When cursor display is instructed, a CPU 12 sends data in a cursor display section to a display control part 6. The control part 6 allows a pulse forming part 8 to forms a gate pulse at the timing corresponding to the cursor display section based upon horizontal/vertical synchronizing signals and converts the background color of the cursor display section to display a cursor. Since the background color of the cursor display section is converted into a color different from that of text broadcasting, a character or a graphic specified by the cursor can easily be identified. In order to switch the background color, it is preferable that the control part 6 is provided with a change- over switch 6 to mutually exchange the R, G and B signals of the background color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a teletext receiver, and more particularly to a method of switching a background color to display a cursor.

[0002]

2. Description of the Related Art Text broadcasting is a system for broadcasting coded character / graphic signals and the like in a part of a vertical blanking period of a television video signal, and is currently broadcasting various news on each channel. Services such as weather forecasts, stock information, and supplementation of TV programs by subtitle supermarkets are provided. Conventionally, when receiving a text broadcast receiver, operations such as a text broadcast program and page selection are performed by operating function keys such as # and * on the remote controller and numeric keys 0 to 9. . On the other hand, as described above, characters, alphanumeric characters, symbols, etc., are encoded and sent in teletext, so these characters, etc. are specified by the cursor display, the contents are identified, and the receiver is identified. Operating means such as controlling are possible. FIG. 4 is an explanatory diagram of a display screen in teletext. In the figure, 31 is the display surface of the monitor 9, and 32 and 33 are the teletext display screens, which are the display areas of the header sentence and the body, respectively. The cells in the display area of the main text indicate the display units of standard horizontal writing characters, each standard character is composed of 16 (horizontal) x 24 (vertical) pixels, and the coloring unit of characters and figures (foreground) and background is 4 x. With 4 pixels, the number of colors is 8 colors and 2 gradations.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a cursor is displayed by switching the background color of a section to be specified by a cursor from the background color of a broadcast signal to another color. The present invention provides a teletext receiver configured to do so.

[0004]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by extracting a character broadcasting signal from an input television broadcasting signal and a data storing the received data output by the data extracting unit. A memory, an image display memory for storing data such as characters / graphics, foreground color / background color, etc., a display control unit for converting the data in the data memory storage into a signal for display on a monitor screen, and the received data. In a teletext receiver equipped with a control unit for controlling storage, retrieval, reading, etc., an input unit for operating a cursor display for designating a specific section of the display screen and a cursor display based on the operation of the input unit. And a pulse generator for generating a gate pulse for switching the background color of the image display memory output by the gate pulse to display a cursor. There is provided a receiver.

[0005]

With the above-described structure, in the teletext receiver according to the present invention, when the specific section of the display screen is displayed by the cursor, the gate pulse corresponding to the cursor display section is generated, and the gate pulse is used. The R (red), G (green), and B (blue) signals of the background color of the section are exchanged with each other, and the background color of the cursor display section is converted into a color different from the background color of the character signal and the cursor is displayed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a teletext receiver according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a teletext receiver according to the present invention. In FIG. 1, 1 is an antenna, and 2 is a tuner, which amplifies and detects a television broadcast signal and converts it into a video signal for output. A data sampling unit 3 separates the superimposed character broadcast signal from the video signal at a predetermined position in the vertical blanking period and outputs an error-corrected character signal. 4 is a data memory, which is a data sampling unit 3
A user-specified character signal or the like is extracted from the output character signal and stored. A character generator 5 decodes the character data from the data memory 4 into the character data to be displayed on the screen. A display control unit 6 writes the decoded character data and the foreground color and rear color data from the data memory 4 into the VRAM 7, reads the written data from the VRAM 7, converts the data into an image signal, and outputs the image signal. To do. Then, at the time of cursor display, the display control unit 6 causes the pulse generation unit 8 to generate a gate pulse corresponding to the cursor display section, switch the color data of the background color of the VRAM 7 and convert it into an image signal of cursor display. Output. Reference numeral 9 is a monitor for displaying an image signal output from the display control section 6, and 10 is an input section for receiving a remote control signal input from the remote control 11. A CPU (Central Processing Unit) 12 is connected to each of the above parts through a bus line 13 and controls each related part such as data write / search / read control according to a program loaded in a program ROM 14.

FIG. 2 shows an embodiment of the background color switching circuit provided in the display controller 6 in the teletext receiver according to the present invention. In the figure, reference numerals 21, 22 and 23 denote Rs obtained by processing the background color data from the VRAM 7 such as D / A conversion.
(Red), G (green) and B (blue) signals, changeover switch 25
The output becomes the R signal 26, the G signal 27, and the B signal 28 via the.
Reference numeral 24 is a gate pulse corresponding to the cursor display section generated by the pulse generator 8 and controls the changeover switch 25. In the case of the normal display without the cursor display, the changeover switch 25 is connected to the upper side of the figure and the R input signal 21 becomes the R output signal 26. Similarly, the G input signal 22 and the B input signal 23 are the G output signal 27 and the G output signal 27, respectively. As the B output signal 28, the background color of the character signal is output as it is. Next, in the case of cursor display, the changeover switch 25 is switched to the lower side of the figure by the gate pulse 24 input at the timing corresponding to the cursor display section, the R input signal 21 becomes the B output signal 28,
Similarly, the G input signal 22 and the B input signal 23 become the R output signal 26 and the G output signal 27, respectively, and are converted into a color different from the background color of the character signal.

Next, the operation of cursor display will be described with reference to the flowchart of FIG. The remote controller 11 is provided with operation keys such as cursor on and move. First, when the remote controller 11 is operated to instruct the display of the specific screen, the remote controller signal by the operation is received by the input unit 10. The CPU 12 detects the input signal, reads the specified data from the data memory 4, and sends the character data decoded by the character generator 5, the foreground / background color data, and the control data to the display controller 6. . The display control unit 6 writes character data and color data in the VRAM 7 based on the input data, reads the written data, converts and outputs the display signal, and displays it on the monitor 9 (step 1, hereinafter abbreviated as ST). Next, if there is a cursor display instruction (ST2, YES
), The CPU 12 sends the data in the cursor display section to the display control unit 6. The display control unit 6 generates a gate pulse 24 at a timing corresponding to the cursor display section on the basis of the horizontal / vertical synchronizing signals in the pulse generation section 8 based on the same data, and controls the changeover switch 25 to change the cursor display section. The background color is converted and the cursor is displayed (ST3). Next, when the cursor movement is input (ST4, YES), the CPU 12 clears the current cursor display and sends the data of the cursor display section of the movement destination to the display control unit 6. The display control unit 6 restores the current cursor display to the original background color, and at the same time, the pulse generation unit 8
At, a gate pulse 24 is generated at a timing corresponding to the destination cursor display section, the changeover switch 25 is controlled to convert the background color of the cursor display section, and the cursor is displayed at the destination position (ST5).

[0009]

As described above, in the teletext receiver according to the present invention, the gate pulse of the timing corresponding to the cursor display section is generated, and the gate pulse generates the background colors R and G of the cursor display section. , B signals are switched to each other so that the cursor is displayed. Therefore, the background color of the display cursor is converted into a color different from the background color of the character broadcast, so that the character or figure designated by the cursor can be easily identified.

[Brief description of drawings]

FIG. 1 is a block diagram of essential parts showing an embodiment of a teletext receiver according to the present invention.

FIG. 2 is a main part circuit diagram showing an embodiment of a background color switching circuit in the teletext receiver according to the present invention.

FIG. 3 is a flowchart showing a cursor display operation.

FIG. 4 is an explanatory diagram of a display screen in teletext.

[Explanation of symbols]

 1 Antenna 2 Tuner 3 Data Extraction Section 4 Data Memory 5 Character Generator 6 Display Control Section 7 VRAM 8 Pulse Generation Section 9 Monitor 10 Input Section 11 Remote Control 12 CPU 13 Bus Line 14 Program ROM

Claims (2)

[Claims] 1. A data extracting unit for extracting a character broadcasting signal from an input TV broadcasting signal, a data memory for storing received data output by the data extracting unit, and characters / graphics.
A display control unit that has an image display memory that stores data such as foreground color and background color, and that converts the data stored in the data memory into a signal to be displayed on a monitor screen, and stores, searches, and reads out the received data. In a teletext receiver having a control unit for controlling, an input unit for operating a cursor display for designating a specific section of a display screen, and a gate pulse for cursor display is generated based on the operation of the input unit. A teletext receiver characterized in that a pulse generator is provided and the background color of the image display memory output is switched by the gate pulse to display a cursor. 2. The teletext receiver according to claim 1, wherein the background color is switched by providing a changeover switch in the display control unit so that the background color R, G and B signals are interchanged with each other.