JPH02260780A - Teletext receiver - Google Patents

Abstract

PURPOSE:To attain print based on a change in foreground or background color even when the foreground color in a foreground or the background color in a background is changed by providing a dot data inversion means outputting the dot data of a print data while it is inverted. CONSTITUTION:Comparators 28, 29 output an L signal when two received color data are coincident and output an H signal when they are discordant. When the color is changed in the foreground 16 or the background 17, a dot data given to a printer 12 is inverted only at boundary sections 35, 36 of the color to print out in a white color onto the boundary section 35 of the foreground on the printing paper and print out in a black color on the boundary section 36 of the background color, thereby displaying the change in the color. Thus, even when a color change exists in the foreground or the background, the printing based on the color change is attained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a teletext receiver, and particularly to a teletext receiver suitable for printing a hard copy of a teletext screen using a printer device. Regarding broadcast receivers.

(Prior Art) Teletext is a system in which various kinds of teletext programs are multiplexed in the form of digital signals and repeatedly transmitted during a specific horizontal scanning period of 11 vertical retrace lines of a television signal.

On the receiving side, by specifying the number of the desired program from among the multiplexed signals, the desired program can be viewed at the desired time.

Furthermore, it is now possible to make a hard copy of the teletext screen using a printer connected to the teletext receiver.

FIG. 5 is a block diagram showing such a conventional teletext receiver.

The CPU 1 operates based on a program stored in the program ROM 2, and controls all processing related to decoding and displaying character information. A video signal on which teletext program data is multiplexed is input to the input terminal 3. The data acquisition circuit 4 extracts program data from the video signal and supplies it to the work RAM 6 via the path line 5. Character RO
M7 outputs pattern data corresponding to the character code of the program data in the work RAM 6 via the pass line 5.

This pattern data is written to the image RAM 9 via the display 1I (1111 circuit 8).The display control circuit 8 controls writing and reading of data to the image RAM 9, and data for one screen is written to the image RAM 9. When you get into it,
The screen data described above is converted into NTSC R, G, and B signals and output to a display device (not shown). thus,
A teletext screen is displayed on the display screen.

Furthermore, a printer interface 10 is provided to enable hard copying of text information.

The cpui reads screen data from the image RAM 9 and outputs print data via the printer interface 10. Data from the printer interface 10 is supplied to the printer device 12 via the printer terminal 11, and the printer device 12 controls the head, paper feed, etc. based on this data, and sequentially prints character information screens on printer paper. Note that black and white printers are usually used, and contrast cannot be added to the print.

Incidentally, on a teletext screen, characters are displayed with a foreground color indicating a foreground portion of the text and a background color indicating a background portion thereof. The foreground color and background color are specified on a dot-by-dot basis. Printer @12 is
Black and white printing is performed corresponding to this background portion and the background portion. That is, the printer device 12 determines which dots to print (hereinafter referred to as printing dots) based on data indicating whether each dot is a foreground portion or a background portion of the printing data (hereinafter referred to as dot data). It is decided whether to print in white or black. For example, if the dot data indicating the foreground part is at a high level (hereinafter referred to as "P") and the dot data indicating the background part is at a low level (hereinafter referred to as 'L'), the printer device Q12
When dot data of "H" is input, the position corresponding to this dot is printed in black, and when dot data of 'L' is input, the position corresponding to this dot is printed in white.

By the way, in teletext broadcasting, it is also possible to specify multiple types of background colors and m1 colors. Therefore, in addition to displaying characters with different background colors and foreground colors as described above, it is also possible to display characters by changing several types of background colors or foreground colors even in the background or foreground parts alone. A broadcast screen can be formed.

FIG. 6 is an explanatory diagram showing a teletext screen displaying a plurality of types of background colors and foreground colors. Furthermore, FIG. 7 is an explanatory diagram showing the print that is printed on printer paper when a hard copy of the teletext screen shown in FIG. 6 is made.

In FIG. 6, the left side of the diagonal line 15 indicates a foreground portion 16, and the foreground colors of red, green, blue, white, and red are displayed in the foreground portion 16 from above. On the other hand, the right side of the diagonal line 15 indicates a background portion 17, and the background colors of white, red, white, green, and black are displayed in the background portion 17 from above. However, as mentioned above, the printer W112 prints the foreground part 16 in black and the background part 17 in white, and does not display contrast, so the front part is printed on the printer paper as shown in FIG. 16 is printed in black (vertical stripes), and the background portion 11 is printed in white.

(Problem to be Solved by the Invention) As described above, in the conventional teletext receiver described above, even if there is a color change in the front part or a color change in the background part, , when hard copying was performed using a printer device, there was a problem that the 9 characters based on the color change were not made to be 1/1.

The present invention has been made in view of such problems, and includes:
An object of the present invention is to provide a teletext receiver that allows a printer device to perform printing based on color changes when there are color changes in the foreground portion and background portion. shall be.

[Structure of the Invention] (Means for Solving the Problems) A teletext receiver according to the present invention uses dot data indicating whether each dot on a teletext screen is a dot in the background or a dot in the background. and a data supply means for outputting color data of each dot, inputting the dot data of a printed dot and the dot data of a dot adjacent to this printed dot among the dot data, and inputting the dot data of the dot adjacent to the printed dot, so that all of these dots are dots of the background part. a detecting means for detecting whether or not all dots are in the M1 portion; inputting the color data of a printed dot and the color data of a dot adjacent to this printed dot among the color data; a color detection means for detecting whether the color data of a dot adjacent to the printed dot matches or not; and a color detection means for detecting whether the printed dot and the dot adjacent to the printed dot are dots of the same portion. , and if the color detection means detects that the color data of the printed dot does not match the color data of a dot adjacent to the printed dot, the dot data of the printed dot is inverted and output. The apparatus is equipped with dot data inverting means.

(Function) In the present invention, the detection means detects whether the printed dot and the dot adjacent to the printed dot are both dots in the foreground portion of the teletext screen, or both are TJWAW dots, The color detection means detects that the color data of the printed dot does not match the color data of a dot adjacent to the printed dot. As a result, the foreground color boundary within the foreground portion and the background color boundary within the background portion are detected. Upon this detection, the dot data inverting means inverts and outputs the dot data of the printed dots.

Therefore, at the color boundary of the foreground portion, print dot data representing dots in the background portion is output, and at the color boundary of the background portion, print dot data representing dots in the foreground portion is output. Therefore, when such a teletext screen is printed using a black and white printer, the color boundaries will be shown as white or black lines on the printer paper.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a block diagram showing an embodiment of a teletext receiver according to the present invention, and FIG. 2 is a circuit diagram showing a specific configuration of a printer interface 18. As shown in FIG. Components in FIG. 1 that are the same as those in FIG. 5 are given the same reference numerals.

The CPU 1, program ROM 2, data import circuit 4, pass line 5, work RAM 6, character ROM 7, display 11111 circuit 8, image RAM 9, printer terminal 11, and printer device 12 have the same configuration as the conventional example. In this embodiment, a printer interface 18 is employed.

In FIG. 2, printing data is supplied to the printer interface 18 via a pass line 5. In FIG. These printing disks have a print dot output circuit 19, an upper dot output circuit 20. It is supplied to a right dot output circuit 21, a print color output circuit 22, an upper color output circuit 23, and a right color output circuit 24. The print dot output circuit 19 outputs dot data of print dots (print dot data). The upper dot output circuit 2G outputs dot data of a dot adjacent to the upper side of a printed dot (hereinafter referred to as an upper dot). The fabric dot output circuit 21 outputs dot data of a dot adjacent to the right side of a printed dot (hereinafter referred to as a right dot). It should be noted that among the dot data outputted from the output circuits 19, 20, and 21, the dot data indicating the foreground portion is "H", and the dot data indicating the background portion is "O". The print color output circuit 22 is designed to output color data of print dots. The upper color output circuit 23 outputs color data of the upper dot. Right color output circuit 2
4 outputs the color data of the right dot.

Print dot data from the print dot output circuit 19 is applied to one input terminal of exclusive OR circuits (hereinafter referred to as EX circuits) 25 and 26. The other input terminal of the EX circuit 25 receives dot data from the upper dot output circuit 20, and the other input terminal of the EX circuit 26 receives dot data from the right dot output circuit 21. EX circuit 2
5 and the outputs of the EX circuit 26 are given to the NOR circuit 21. On the other hand, color data from the print color output circuit 22 is applied to one input terminal of the comparison circuits 28 and 29. The color data from the upper color output circuit 23 is input to the other input terminal of the comparison circuit 28, and the color data from the fabric part color output circuit 24 is input to the other input terminal of the comparison circuit 29. The comparison circuits 28 and 29 output an "L" signal if the two input color data match, and output an "H" signal if they do not match. The outputs of the comparison circuits 28 and 29 are provided to an OR circuit 30.

The output of the NOR circuit 27 and the output of the OR circuit 30 are ANDed.
The output of the AND circuit 31 is applied to the other input terminal of the EX circuit 32. Print dot data is applied to one input terminal of the EX circuit 32 from a print dot output circuit 19. The output of the EX circuit 32 is provided to the printer device 12 via the printer terminal 11.

Next, the operation of the teletext receiver configured as described above will be explained with reference to the explanatory diagram of FIG. 3.

FIG. 3 is an explanatory diagram showing the print that is printed on printer paper when a hard copy of the teletext screen shown in FIG. 6 is made. In addition, in FIG. 3, vertical stripes indicate black printing.

Now, the printed dot is a dot in the foreground part 16, and at least one of the upper dot and the right dot is in the background part 1.
1 dot. In this case, the output of the print dot output circuit 19 is 'H', and the output of at least one of the upper dot output circuit 2G and the fabric dot output circuit 21 is 'L', so the output of the EX circuit 25.26 is 'L'. The output of at least one of them becomes “H”. Therefore, NOR
The output of the circuit 21 becomes "L". Then, the AND circuit 31 outputs "S", and the EX circuit 32 outputs "H", which is the same as the output of the print dot output circuit 19. Furthermore, even when the printed dot is in the background portion 17 and at least one of the upper dot and the right dot is a dot in the foreground portion 16, the EX circuit 32 outputs the same print dot data as the dot output circuit 19 ( “L”) is output to the printer terminal 11. Therefore, in these cases, printing is performed in the same way as conventional printing.

It is now assumed that the printed dot is a dot in the foreground portion 16, and that the upper dot and right dot are also dots in the foreground portion 16. In this case, the outputs of the print dot output circuit 19, the upper dot output circuit 20, and the right dot output circuit 21 are all "H", and the outputs of the EX circuits 25 and 26 are both "L". Therefore, the output of the NOR circuit 27 becomes "TODO".If the color data of the printed dots and the color data of at least one of the upper dots and the cloth dots do not match, that is, as shown in FIG. At the boundary between each foreground color, at least one of the comparison circuits 28 and 29 outputs an "H" signal.Then, the OR circuit 3
0 outputs an "H" signal, and the output of the AND circuit 31 becomes "H". Therefore, the EX circuit 32 outputs an "L" output to the printer terminal 11, which is different from the level of the print dot data.

Therefore, on the printer paper, as shown in Figure 3,
Each boundary portion 35 of the foreground color will be printed in white.

Also, when the printed dots, upper dots, and fabric dots are all dots in the background portion 17, N is also determined.

The output of the R circuit 27 becomes "H", and at the border of the background color, the output of the AND circuit 31 becomes "H", and the output of "H", which is different from the printed dot data, is sent to the printer via the printer terminal 11. Given to @12.

Therefore, in this case, as shown in FIG. 3, black printing is performed at each border 3G of the background color.

As described above, in this embodiment, when the color changes within the foreground portion 16 or the background portion 17, the dot data provided to the printer device 12 is inverted only at the color boundary portions 35 and 36, so that printing is possible. On the paper, the foreground color boundary 35 is printed in white, and the background color boundary 36 is printed in black to show the color change.

FIG. 4 is a flowchart for explaining the operation of another embodiment.

This embodiment differs from the embodiment shown in FIG. 1 in the control of the CPU, and the configuration other than the CPU is the same as that of the conventional example shown in FIG.

In step S1 of FIG. 4, the CPU reads screen data of printed dots from the image RAM 9 shown in FIG. Next, in step S2, the CPU reads the double-sided data of the upper dot. In the next step S3, the CPU compares the "L" and "HII" of the dot data of the screen data of the read printed dot and the upper dot with each other, and if they are the same, the process moves to step S4, and if they are different. If there is, the process moves to step S8.Step S
8, the print dot data is output as is via the printer interface 10. On the other hand, in step S4, it is determined whether the color data of the read print dot and the screen data of the upper dot match. If the color data match, the process goes to step S5.
If they do not match, the process goes to step S9.
to move to. In step S9, the printed dot data is inverted and outputted via the printer interface 10. As a result, if the colors change in the vertical direction within the foreground and background areas, the dot data at these boundaries will be inverted and output, and the color boundaries will appear as white lines in the foreground areas on the printer paper. The front part is printed with a black line at the border between the colors.

If the color data match in step S4, the CP
U reads the screen data of the right dot in the next step S5. Next, in step S6, the printed dot data and the right dot data are compared, and in step S7, the color data of the printed dots and the right dot are compared. Step S6
If the dot data do not match in step S7
If the color data match, the printed dot data is output as is in step S8. If the dot data match but the color data do not match, the printed dot data is inverted and output in step S9. As a result, if the color changes in the horizontal direction within the foreground portion and the background portion, the dot data at this boundary portion is output inverted. In this case, the color boundaries are printed as white lines in the foreground portion of the printer paper, and the color boundaries are printed as black lines in the background portion of the printer paper. In the next step 510, it is determined whether all the screen data has been processed. If there is any data that has not been read, the process moves to step S1 and the same operation is repeated.

It is clear that the same effects as in the embodiment shown in FIG. 1 can be obtained in this embodiment as well.

Note that the present invention is not limited to the above embodiments,
For example, instead of using the dot data and color data of the upper and right dots, the dot data and color data of the dots adjacent to the lower and left side of the printed dot may be used.

[Effects of the Invention] As explained above, according to the present invention, even if the foreground color or background color changes within the foreground portion and the background portion, the printer device can print based on the change in these colors. can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the teletext receiver according to the present invention, FIG. 2 is a circuit diagram showing a specific configuration of the printer interface 18, and FIG. 3 is for explaining the operation of the embodiment. FIG. 4 is a 70-diameter diagram for explaining the operation of a teletext receiver according to another embodiment of the present invention, and FIG. 5 is a block diagram showing a conventional teletext receiver.
FIG. 6 is an explanatory diagram showing a teletext screen, and FIG. 7 is an explanatory diagram showing printing on printer paper. 1...CPU, 5...Data bus, 9...Image R
AM111...Printer terminal, 12...Printer device, 18...Printer interface. Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] Data supply means for outputting dot data indicating whether each dot on a teletext screen is a background dot or a foreground dot and color data of each dot; a detection means for inputting dot data of a printed dot and dot data of a dot adjacent to the printed dot, and detecting whether these dots are both dots in the background area or both are dots in the foreground area; , Input the color data of a printed dot and the color data of a dot adjacent to this printed dot among the color data, and detect whether the color data of the printed dot and the color data of a dot adjacent to the printed dot match. the color detection means detects that the printed dot and the dot adjacent to the printed dot are both dots of the same portion, and the color detection means detects that the color data of the printed dot and the printed dot are A teletext receiver comprising: dot data inversion means for inverting and outputting the dot data of the printed dots when it is detected that the color data of adjacent dots do not match. .