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公开(公告)号：US4623880A
公开(公告)日：1986-11-18
申请号：US566245
申请日：1983-12-28
摘要： The invention concerns a graphics display system of the kind having a refresh raster display device, a line clipping mechanism for clipping line primitives for viewing in a selected rectangular viewport having horizontal and vertical edges parallel to the X and Y axes respectively of the display area of the display device, and a vector-to-raster converter for converting the clipped lines to patterns of discrete pels in a refresh buffer, the vector-to-raster converter including an incremental line drawing mechanism responsive to line information supplied by the clipping mechanism to draw the line starting at one endpoint and proceeding towards the other. In such a system, for at least some lines of a kind which have a first endpoint in the viewport and the second endpoint outside the viewport, the clipping mechanism is arranged to avoid calculating the intersection point of the line with the viewport edge intersected by the line, and the vector-to-raster converter is arranged to start the line drawing mechanism at the first endpoint and halt the line drawing mechanism when the currently generated coordinate along the display axis normal th the said viewport edge equals the coordinate of the viewport edge along the same axis.
摘要翻译： 本发明涉及一种具有刷新光栅显示装置的图形显示系统，用于剪切用于在所选矩形视口中观看的线基元的线剪切机构，所述矩形视口具有平行于X和Y轴的显示区域的X和Y轴的水平和垂直边 所述显示装置和用于将所述经剪切的线转换为刷新缓冲器中的离散像素的图案的矢量到光栅转换器，所述矢量到光栅转换器包括响应于由所述剪切机构提供的线信息的增量线绘制机构， 从一个终点开始绘制线，并向另一个终点前进。 在这种系统中，对于在视口中具有第一端点和视口外的第二端点的类型的至少一些线，该夹持机构被布置成避免计算该线与与该视口相交的视口边缘的交点 并且矢量到光栅转换器被布置为在第一端点处启动线条绘制机构，并且当沿着显示轴的当前生成的坐标垂直于所述视口边缘等于视口边缘的坐标时，停止线描绘机构 沿同一轴线。
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公开(公告)号：US4633243A
公开(公告)日：1986-12-30
申请号：US592675
申请日：1984-03-23
摘要： In a method of storing characters in a display system having a display device with an orthogonal matrix of addressable points, each character is represented as a succession of strokes each constrained to lie in one of the eight fundamental directions of the matrix and, except for the first stroke, each starting at the end of the previous stroke. Each such stroke is stored in a binary coded form which includes a first binary number (direction code) defining the angular direction of the stroke, a second binary number (length code) defining a number of matrix steps from one addressable point to the next along the stroke in that direction, and a third binary number (move/draw code) defining the visibility of the stroke. In order to facilitate character rotation by any multiple of 45.degree. the direction code defining each fundamental direction corresponds to the addition modulo 2.sup.n of a binary constant to the direction code which defines the fundamental direction of 45.degree. thereto in a given direction of rotation, where n is the number of bits in the direction code.
摘要翻译： 在具有具有可寻址点的正交矩阵的显示装置的显示系统中存储字符的方法中，每个字符被表示为一系列笔划，每个笔划被限制在矩阵的八个基本方向之一中，除了 第一次中风，每个起始于上一次中风结束。 每个这样的笔划被存储为二进制编码形式，其包括限定笔划的角度方向的第一二进制数（方向代码），定义从一个可寻址点到下一个的多个矩阵步骤的第二二进制数（长度码） 在该方向上的笔画，以及定义笔画的可视性的第三个二进制数（移动/绘制代码）。 为了方便字符旋转45度的任何倍数，定义每个基本方向的方向代码对应于在给定的旋转方向上限定45°的基本方向的方向代码的二进制常数的加法模2n，其中 n是方向代码的位数。
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公开(公告)号：US4996653A
公开(公告)日：1991-02-26
申请号：US138241
申请日：1987-12-28
摘要： In a line generator and a method for determining the individual pixels to be plotted for a line to be drawn in a display system, coded representations of a plurality of lines are stored in a line definition table. The coded representation of each individual line is a string of data items representing the transitions between adjacent pixels to be plotted for drawing the individual line. Preferably, only coded representations of lines up to a predetermined size (i.e. the length of the line in the case of a straight line) are stored in the line definition table. Strings of data items for representing the pixels to be plotted for longer lines to be drawn are still calculated as in the prior art. In this case, control logic determines whether there are coded representations of a line to be drawn in the line definition table, or not, and passes control to appropriate processing logic for determining the pixels to be plotted. In a preferred embodiment, the string of data items forming the coded representation of a line to be drawn is a string of binary digits and the value of each bit in the string represents a transition in one of two directions. This provides a very compact representation of the line.
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公开(公告)号：US5210723A
公开(公告)日：1993-05-11
申请号：US606262
申请日：1990-10-31
CPC分类号： G11C8/12 , G11C7/1015 , G11C7/1021
摘要： In a memory addressable by row and by column and operable in page mode whereby multiple column cycles are performed within a single row cycle, an arrangement is provided for stepping the row address for selected column cycles whereby sustained page mode operation can be provided throughout memory address space. Preferably, stepping occurs in response to a row change signal supplied when a column address strobe becomes active and the direction of stepping is determined by a mode signal supplied when a row address strobe becomes active. Memory segmentation is employed to facilitate simultaneous activation and restoring of multiple rows.
摘要翻译： 在可通过行和列寻址并且以页面模式操作的存储器中，在单个行周期内执行多个列周期，提供了用于对所选列周期的行地址进行步进的布置，从而可以在存储器地址中提供持续的页面模式操作 空间。 优选地，当列地址选通变为有效时响应于提供的行改变信号而发生步进，并且当行地址选通变为有效时由提供的模式信号确定步进方向。 采用内存分段来促进多行的同时激活和恢复。
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公开(公告)号：US5081607A
公开(公告)日：1992-01-14
申请号：US483859
申请日：1990-02-23
CPC分类号： G06F7/505 , G06F9/30036 , G06F2207/3816 , G06F2207/3828
摘要： A digital arithmetic logic unit in which the carry chain is subdivided into a series of bit fields allowing independent and simultaneous data manipulation to be undertaken in each of the bit fields. Division of the carry chain is achieved via a carry chain selector consisting of a series of multiplexers, one being placed between each pair of adjacent stages of the carry chain. Each multiplexer has two data inputs, one of which forms the carry to the next stage of the carry chain. The carry selected either continues the computation or defines the end of one bit field and provides the least significant carry-in bit to the next bit field. This selection of the carry by the multiplexer is under control of a programmable register, thus allowing variable division of the carry chain.
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6.发明授权
公开(公告)号：US5526354A
公开(公告)日：1996-06-11
申请号：US261548
申请日：1994-06-17
IPC分类号： G06F13/00 , H04L12/18 , H04L12/64 , H04M3/56 , H04M11/06 , H04N7/15 , H04N7/52 , H04J3/26 , H04M3/42
CPC分类号： H04N21/2368 , H04L12/1813 , H04M3/567 , H04N21/23614 , H04N21/4307 , H04N21/4341 , H04N21/4348 , H04N7/15 , H04L12/64
摘要： The present invention relates a communication terminal for the synchronization of audio and visual information within a communication system. Audio communication between the parties to a video conference is achieved by digitizing the speech and transmitting the same over a packet based data network. Each party to the conference can draw the attention of the other party to an object on the screen using a pointer controlled by, say, a mouse or ball. The co-ordinates of each parties' pointer are incorporated, via a multiplexer, into the data packets containing the digitized speech and transmitted to the other party's terminal thereby ensuring the synchronization the pointer information with the digitized speech.
摘要翻译： 本发明涉及通信终端，用于通信系统内的音视信息的同步。 视频会议的各方之间的音频通信通过数字化语音并通过基于分组的数据网络发送它来实现。 会议的每一方可以使用由鼠标或球控制的指针，将对方的注意力吸引到屏幕上的对象上。 各方指针的坐标通过多路复用器被并入到包含数字化语音的数据分组中，并被发送到对方的终端，从而确保指针信息与数字化语音的同步。
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公开(公告)号：US4899294A
公开(公告)日：1990-02-06
申请号：US121976
申请日：1987-11-18
申请人： Colin J. Easton , Adrian C. Gay
发明人： Colin J. Easton , Adrian C. Gay
摘要： A graphics processing system has the capability of generating a map of an image in terms of the individual picture elements or pixels from data defining the boundaries of component areas of the image. The disclosed generating system comprises a plurality of paired storage locations, called a convex area table, with each pair of locations being associated with a line of individual picture elements on the image. Processing logic computes display line and displacement values for a component area of the pair of storage locations for the corresponding display line. The stored displacement values can then be used for generating the full pixel map of the image.
摘要翻译： 图形处理系统具有根据定义图像的分量区域的边界的数据从各个像素或像素生成图像的映射的能力。 所公开的生成系统包括多个配对的存储位置，称为凸区表，其中每对位置与图像上的各个图像元素的一行相关联。 处理逻辑为相应显示行的一对存储位置的组件区域计算显示行和位移值。 然后存储的位移值可用于生成图像的全像素图。
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公开(公告)号：US5627825A
公开(公告)日：1997-05-06
申请号：US300302
申请日：1994-09-02
IPC分类号： H04N7/15
摘要： In a video conference between N parties, each video conferencing terminal produces a respective video signal comprising, in the case of the National Television Standard Committee (NTSC) standard, sixty fields per second. The input video signals are input to an analog multi-point control unit which selects every Nth field from each input video signal and derives therefrom a single output video signal also of sixty fields per second, in which consecutive fields are derived cyclically from each of the N input video signals in turn. The single output video signal is transmitted to each video conferencing terminal, which separates out the fields of the input video signals present in the single output video signal to provide N individual reduced field rate video signals each comprising 60/N fields per second and each having fields derived from a respective one of the input video signals.
摘要翻译： 在N方之间的视频会议中，每个视频会议终端产生相应的视频信号，在国家电视标准委员会（NTSC）标准的情况下，每秒60个字段。 输入视频信号被输入到模拟多点控制单元，该模拟多点控制单元从每个输入视频信号中选择每第N个场，并从其中导出每秒60场的单个输出视频信号，其中连续的场是从 N个输入视频信号。 单输出视频信号被发送到每个视频会议终端，每个视频会议终端分离存在于单输出视频信号中的输入视频信号的场，以提供每个包括每秒60 / N场的N个单独的降低的场速率视频信号， 从相应的一个输入视频信号导出的场。
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公开(公告)号：US5157766A
公开(公告)日：1992-10-20
申请号：US484145
申请日：1990-02-23
申请人： Nicholas D. Butler , Adrian C. Gay
发明人： Nicholas D. Butler , Adrian C. Gay
CPC分类号： G09G5/393
摘要： A computer graphics system includes display logic (92) comprising a destination bit map (11) containing a plurality of image bits which map to a plurality of pixels for presenting an image, an auxiliary bit map (1) containing a plurality of area boundary bits representing pixels defining an area boundary line which encloses an area of the image, area filling logic (7) for operating upon those image bits enclosed by the area boundary line in order to fill the area with a particular pattern and color, characterized in that the display logic further comprises area boundary drawing logic (5) having line segmentation means to resolve the specified boundary line into a plurality of intersecting two pixel line segments which can, from that time forward, be operated upon separately to define the area boundary bits in accordance with conventional area boundary drawing rules.
摘要翻译： 计算机图形系统包括显示逻辑（92），包括目的地位图（11），其包含映射到用于呈现图像的多个像素的多个图像位;辅助位图（1），其包含多个区域边界位 表示限定包围图像区域的区域边界线的像素，区域填充逻辑（7），用于对由区域边界线包围的那些图像位进行操作，以便填充具有特定图案和颜色的区域，其特征在于， 显示逻辑还包括区域边界绘制逻辑（5），其具有线分割装置，用于将指定的边界线分解为多个相交的两个像素线段，其可以从该时间向前分开操作以根据相应的区域边界位 具有传统的区域划界规则。
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