摘要:
The television receiver includes a teletext decoder having a page memory PM into which teletext data is read from a data acquisition circuit DAC via an interface circuit MIC under control of a microprocessor PRO. The microprocessor PRO is also used to control functions of the television receiver and to cause on-screen display messages to be produced. When an on-screen display message is to be produced the microprocessor sets a bit in the memory PM which causes a latch to be set which in turn causes a multiplexer MUX to apply data from an auxiliary memory APM to a character generator CG. When the on-screen display message is to be dispensed with the bit in the memory PM is reset causing the latch to be reset and the multiplexer MUX to apply data from the page memory PM to the character generator CG. This enables on-screen display messages to be applied to the character generator CG without losing any of the teletext data stored in the page memory PM.
摘要:
When the horizontal size of a display character is given by 9 dots, 8-dot font data is stored in a font register (16), and 1-dot display attribute data is stored in a register (17). Display attribute data is data for designating the 8th dot of a character pattern to be displayed. A selector (18) converts 9-dot data supplied from the font register (16) and the register (17) to serial data on the basis of a counter value (CD) of a counter (19) and supplies the serial data to a CRT (4) when 80 characters are to be displayed in the horizontal direction on the CRT (4) having a horizontal resolution of 720 dots per scanning line. When an FPD (5) having a horizontal resolution of 640 dots per scanning line is to be used, the selector (18) converts only 8-dot font data supplied from the font register (16) to serial data on the basis of a counter value (CD) from the counter (19) and supplies the serial data to the FPD (5). As a result, eighty 8-dot characters are displayed in the horizontal direction of the FPD (5) despite that display of 9-dot characters is designated. However, the numbers of display characters of the CRT (4) and the FPD (5) in the horizontal direction coincide.
摘要:
In a display control system employing a character display mode, when a character code determining circuit (11) determines, during display period, that character code data read out from a character code data memory (1) is a specified character code such as a space code, or when a raster address determining circuit (10) determines that a raster address of character information displayed on a display device (9) is a specified raster address, an address selector (6) selects a CPU address in accordance with a selection signal output from a selector control circuit (4), and access to a font data memory (7, 13) is performed in accordance with the selected CPU address.
摘要:
Ce dispositif d'entrée sortie de données pour l'affichage d'informations est monolithiquement intégré dans un circuit d'application spécifique. Ces moyens de mémorisation MM sont principalement constitués d'une mémoire unique M partagée en zones spécifiques aux programmes, à l'écran et au générateur de caractères. L'accès aux différentes zones spécifiques est autorisé par une ligne de bus mémoire unique MB et géré selon un procédé de séquencement au moyen d'un séquenceur microprogrammé selon le principe de la régulation de flux. A cette mémoire M peuvent être ajoutés différents dispositifs permettant d'utiliser pleinement la bande passante de ladite mémoire, tels que : une antémémoire CM, un registre FIFO FR et des registres tampons de ligne RB.
摘要:
An ideographic teletext transmission system based on the World System Teletext specification in which ideograms (I0, I1 ... I19) are displayed in the space of two character positions (0,1; 2,3; ... 38,39) in each of three display rows (RN, RN+1, RN+2), the ideogram code being defined by the corresponding bytes (0,1; 2,3; ... 38,39) in one (PN), e.g. the first, of the transmission packets corresponding to the three display rows (RN, RN+1, RN+2) and the corresponding bytes (0,1; 2,3; ... 38,39) in another of the transmission packets (PN+2) corresponding to the three display rows being used to define an attribute code thereby affording a non-spacing attribute facility.
摘要:
A method of displaying graphics on a computer terminal screen comprising:
1) digitising an image to be displayed into a digital information array of predetermined dimensions; 2) sub-dividing said information array into a plurality of identically sized pixel matrices, each corresponding in size to a standard character displayed on said screen; 3) assigning a different predefined standard character code to each pixel matrix in the array; 4) defining the screen display of the standard character code assigned to each pixel matrix according to the digitised information in the respective pixel; 5) displaying the defined characters on the screen in continuous arrangement corresponding to the arrangement of pixels in the array so as to display the image.
摘要翻译:一种在计算机终端屏幕上显示图形的方法,包括:1)将要显示的图像数字化为具有预定尺寸的数字信息阵列; 2)将所述信息阵列细分成多个相同大小的像素矩阵,每个像素矩阵的大小与显示在所述屏幕上的标准字符相对应; 3)向阵列中的每个像素矩阵分配不同的预定标准字符码; 4)根据相应像素中的数字化信息定义分配给每个像素矩阵的标准字符代码的屏幕显示; 5)以与阵列中的像素的布置相对应的连续布置在屏幕上显示定义的字符,以便显示图像。 p
摘要:
A display control device according to the present invention includes a common memory having two funtions, one as a refresh memory for outputting a character code and the other as a character generator for generating a character font, an output character code from which is stored in a line buffer. In this case, a display address generator circuit generates a character address for generating the character code and a raster address for designating the character font, which are in turn switched by an address selector and outputted to said common memory which then outputs a video signal to a video control circuit based upon said character font. Additionally, there is provided a line buffer control circuit for outputting a read/write access control signal to said line buffer based upon the raster address.