JP2906145B2 - Character / graphic information display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a character / graphic information display device that decodes received character / graphic information and displays it on a display unit. (Prior Art) In recent years, various television multiplex broadcasts have been considered in order to make effective use of broadcast radio waves. One of the multiplex broadcasts is news, weather forecasts, stock 2. Description of the Related Art Television multiplex broadcasting capable of displaying text and graphic information such as market conditions on a screen of a television receiver has been put to practical use. On the other hand, Videotex, which transmits character / graphic information using a telephone line and displays similar information on a screen of a television receiver, has also been put to practical use. Hereinafter, a character / graphic information display device capable of receiving character / graphic information as described above and displaying the character / graphic information on a screen of a television receiver will be described with reference to the drawings. FIG. 8 shows the configuration of a conventional character / graphic information display device. In FIG. 8, 1 is a character / graphic information decoding unit for decoding character / graphic information into a character / graphic image, 2 is a microprocessor circuit for controlling the character / graphic information decoding unit 1, and 3 is character / graphic information as digital data from a video signal. A receiving circuit 4 to be taken out, a RAM 4 for storing received character / graphic information and a working area of the microprocessor circuit 2, a ROM 5 for storing a program for controlling the microprocessor circuit 2, and a display memory 7 , A display processing circuit for synthesizing the character / graphic image stored in the microprocessor with an RGB signal, 7 a display memory for storing the character / graphic image decoded by the microprocessor circuit 2, and 8 a character / graphic information included in the character / graphic information. 9 is a character generator used for decoding character / graphic information into a character / graphic image, and 10 is a sentence. A keypad to instruct such as selecting a graphic character data to the graphic information decoding section. 20 is a television signal receiving unit, 21 is an antenna, 22
Is a television signal receiving circuit, 23 is an audio demodulating / amplifying circuit, 24 is a luminance amplifying / color demodulating circuit, 25 is a television video / audio signal and RGB output from the character / graphic information decoding unit 1
A video / audio switching circuit for switching or mixing a signal and an additional sound signal, 26 is an audio amplification output circuit, 27 is a video amplification output circuit, 28 is a speaker, and 29 is a display unit for displaying an image. The operation of the character / graphic information display device configured as described above will be described below. The television signal received by the antenna 21 is demodulated by a television signal receiving circuit 22 of the television signal receiving section 20, and a video signal and an audio signal are extracted. The video signal is input to the receiving circuit 3 of the character / graphic information decoding unit 1, and character / graphic information is extracted from the video signal. User is keypad
By operating 10, the microprocessor circuit 2 is instructed to select a desired character / graphic information program from many character / graphic information programs. The microprocessor circuit 2 selects the designated character / graphic information program, stores it in the RAM 4, and performs a decoding process in accordance with the contents of the program stored in the ROM 5 while using the character generator 9 as necessary. Is converted to a character / graphic image and stored in the display memory 7. The character / graphic image stored in the display memory 7 is synthesized into an RGB signal by the display processing circuit 6. The additional sound data included in the character / graphic signal is converted by the additional sound decoder 8 into an additional sound signal. On the other hand, the audio signal and the video signal demodulated by the television signal receiving circuit 22 are input to an audio demodulation / amplification circuit 23 and a luminance amplification / color demodulation circuit 24, processed, and input to a video / audio switching circuit 25, respectively. The video / audio switching circuit 25 displays a character / graphic image by switching between a video signal (RGB signal) and an audio signal (additional sound signal) output from the character / graphic information decoding unit 1 and a video signal and an audio signal of a television. To display the television image, the former is selected, and the latter is input to the speaker 28 and the display unit 29 through the audio amplification output circuit 26 and the video amplification output circuit 27, respectively. Through the above operation, the user can cause the display unit 29 to display the selected character / graphic information. (Problems to be Solved by the Invention) However, the character / graphic information display device configured as described above has a problem that an image displayed on the display unit can only display a character / graphic image of one screen. . The present invention has been made in view of the above problems, and provides a character / graphic information display device capable of simultaneously displaying character / graphic images of a plurality of pages of a designated program or character / graphic images of a designated plurality of programs on a display unit. is there. (Means for Solving the Problems) In order to achieve this object, a character / graphic information display device according to the present invention comprises display control information, pattern data for expressing a graphic with dots, and attribute data for specifying a display attribute of a character / graphic. A receiving circuit for receiving character / graphic information including: a display memory for storing character / graphic information obtained by decoding the character / graphic information; and a display memory for storing the character / graphic information at a display density specified by the display control information. When performing control to reduce one section formed by a plurality of pixels in the pattern data to form one section by one pixel so that a display density of / N is obtained, the number is the largest among a plurality of pixels in one section. Decoding means for determining a dot of a pixel having attribute data as a dot of one pixel after reduction to decode it into a character / graphic image and sequentially storing it in the display memory; And a display processing circuit for displaying the character / graphic image stored in the display memory on the display unit. (Operation) The present invention has the following operation by such a configuration. That is, the character / graphic information received by the receiving circuit is
In the case of decoding as a reduced character graphic image, when converting one section including a plurality of pixels into one pixel, the dot of the pixel having the most attribute data among the plurality of pixels is determined to be the dot of one pixel after reduction. By performing the control, the character / graphic information is decoded into the reduced character / graphic image, stored in a corresponding portion of the display memory, and the display processing circuit reads out the contents of the display memory, whereby the visibility of the character or the graphic is improved. Thus, it is possible to simultaneously display a plurality of character / graphic information of each page of the same program or a plurality of character / graphic information of a plurality of programs on the display unit. Example An example of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a character / graphic information display device according to an embodiment of the present invention. In FIG. 1, 1 is a character / graphic information decoding unit for decoding character / graphic information into a character / graphic image, 9 is a first character generator having the same function as a conventional character generator, and 11 is a reduced pattern output. A second character generator 2 comprising a microprocessor circuit having decoding means including first reducing means 12, second reducing means 13, third reducing means 14, and first or second writing means 15; Reference numeral 6 denotes a display processing circuit for synthesizing a character / graphic image stored in the display memory 7 with an RGB signal. 4 is a RAM, 5 is a ROM, 8 is an additional sound decoder, 10 is a keypad, 20 is a television signal receiving section, 21 is an antenna, 22 is a television signal receiving circuit, 23 is an audio demodulating / amplifying circuit, and 24 is luminance. Amplification / color demodulation circuit, 25 is a video / audio switching circuit, 26 is an audio amplification output circuit, 27
Is an image amplification output circuit, 28 is a speaker, and 29 is a display unit for displaying an image. The above is the same as the configuration shown in FIG. The operation of the character / graphic information display device configured as described above will be described below. The character / graphic information display device of this embodiment is basically the eighth
The same operation as shown can be performed. FIG. 4 shows an example of the structure of the character / graphic information. The display control information A specifies the display density of the character / graphic information, the pattern data B expresses the graphic by dots, and the character generator of the character / graphic information display device. Character code data C to be converted into a pattern by
It is composed of attribute data D for designating the display attribute of a character graphic. The following description will be made with reference to an example in which the character graphic information is received. When the user specifies to display the character graphic image in a reduced size using the keypad 10, the decoding process is performed at a display density different from the display density specified by the display control information A. FIG. 5 shows a method of reducing the pattern data B by the first reducing means 12. here,
A case will be described in which the pattern data having the minimum number of vertical pixels (m1) of 2 and the number of horizontal pixels (m2) of 2 is reduced to 1 (m3) pixels. In FIG. 5, 4 shown in section 1 before reduction
For the pixels, the logical sum of the dots of each pixel is calculated. Block 1
In this example, two pixels have a dot and the remaining two pixels have no dot.
Pixels have dots. A similar process is performed for each section to reduce the size. The character code data C is reduced by the second reduction unit 13 using the second character generator 11 that generates a reduced pattern. FIG. 6 shows a method of reducing the attribute data by the third reduction means 14. Also in this case, the data in which the minimum number of pixels (n1) is 2 and the number of horizontal pixels (n2) is 2
(N3) A case where the image is reduced to pixels will be described. In FIG. 6, the attribute data having the largest number among the attribute data of the four pixels indicated by the section 1 before reduction is selected. Since all four pixels are red in the section 1, the reduced pixel 1 is red. A similar process is performed for each section to reduce the size. The character graphic image reduced by the above processing is stored in the display memory 7. The reduced character graphic image stored in the display memory 7 is displayed by the display processing circuit 6 on the portion where the character graphic image is stored, and is displayed on the television set where the character graphic image is not stored. The image is synthesized so as to be displayed on the display unit 29. FIG. 2 shows an example of a character graphic image displayed at the display density designated by the character graphic information, and FIG. 3 shows a case where a reduced character graphic image is displayed. The method of displaying a single screen in a reduced size has been described above. Next, a case in which a plurality of types of reduced character / graphic images are stored in the display memory 7 to simultaneously display a plurality of types of character / graphic images will be described. . FIG. 7 shows an example in which a plurality of reduced character graphic images are displayed on the display unit 29. As a first case, when the user specifies a single program, the decoding process to the display memory 7 is performed so that the pages of the specified program are sequentially displayed at the positions of the character graphic images 1 to 4. This is performed by the first writing means 15. As a second case, when the user specifies a plurality of programs, the first program specified at the position of the character graphic image 1 and the second program specified at the position of the character graphic image 2 The display memory 7 is displayed so that each page of the specified third program is displayed at the position of the character graphic image 3 and the page of the specified fourth program is sequentially displayed at the position of the character graphic image 4. Is decrypted by the second writing means 15. As described above, according to the present embodiment, the first reduction unit 12, the second reduction unit 13, the third reduction unit 14, and the first or second reduction unit
And a second character generator 11 for generating a reduced pattern, so that a character graphic image can be reduced and simultaneously a plurality of types of character graphic images can be reduced. Can be displayed. (Effects of the Invention) As described above, according to the present invention, it is possible to perform reduced display with excellent visibility of characters or graphics, and to simultaneously view each page of the same program or simultaneously view a plurality of programs. Yes, its practical effects are significant.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a functional block diagram showing the configuration of a character / graphic information display device according to one embodiment of the present invention, and FIG. 2 is an example of a screen decoded at a display density designated by the character / graphic information. Diagram,
FIG. 3 is a diagram showing a screen example in which the screen of FIG. 2 is reduced and a character graphic image and a television image are simultaneously displayed, FIG. 4 is a diagram showing a configuration example of character graphic information, and FIG. FIG. 6 is an explanatory view of the reduction by the third reduction means, FIG. 7 is a view showing an example of a screen displaying a plurality of reduced character graphic images, and FIG. It is a block diagram which shows the example of a structure of the example character graphic information display device. DESCRIPTION OF SYMBOLS 1 ... Character graphic information decoding part, 2 ... Microprocessor circuit, 3 ... Receiving circuit, 4 ... RAM, 5 ... ROM, 6 ... Display processing circuit, 7 ... Display memory, 8 ... Additional sound decoder, 9 ... First character Generator, 10 ... keypad, 11 ... second character generator,
12: first reduction means, 13: second reduction means, 14: third reduction means, 15: first or second writing means, 20: television signal receiving unit.

Continuation of front page    (72) Inventor Yuji Kondo               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Ken Sakamoto               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Toyoaki Unemura               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Hiroyasu Shinbo               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Yukio Takada               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd. (72) Inventor Yoichi Ishibashi               Matsushita, 1006 Kadoma, Kazuma, Osaka               Kiki Sangyo Co., Ltd.                (56) References JP-A-61-105190 (JP, A)                 JP-A-62-59485 (JP, A)                 JP-A-61-162081 (JP, A)                 JP-A-58-163990 (JP, A)                 62-37359 (JP, U)                 Jiko 61-14234 (JP, Y2)

Claims (1)

(57) [Claims] A receiving circuit for receiving character / graphic information including display control information, pattern data expressing a graphic by dots and attribute data for specifying a display attribute of the character / graphic, and character / graphic information obtained by decoding the character / graphic information A display memory for storing character / graphic information, and reducing one section formed by a plurality of pixels in the pattern data to one pixel so that the display density is 1 / N of the display density specified by the display control information. In the case of performing control to form one section by using, a dot of a pixel having the most attribute data among a plurality of pixels in one section is determined as a dot of one pixel after reduction, thereby decoding into a character / graphic image, Decoding means for sequentially storing in the display memory, and a display processing circuit for displaying a character / graphic image stored in the display memory on a display unit Graphic character data display device comprising and.