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    • 2. 发明授权
    • Digital velocity servo
    • 数字速度伺服
    • US4380723A
    • 1983-04-19
    • US046130
    • 1979-06-05
    • Michael D. LeisRobert C. Rose
    • Michael D. LeisRobert C. Rose
    • H02P29/00G01P3/489H02P7/29H02P5/16
    • G01P3/489H02P7/2913Y10S388/902Y10S388/922
    • A servo circuit for electronically controlling the operation of an electric motor is disclosed. The rotational frequency of the motor is converted into a varying frequency waveform by a tachometer. The tachometer output is applied to a conversion circuit which includes a peak detector that converts the output waveform of the tachometer into a square-wave signal. The square-wave signal is, in turn, connected to one input of an exclusive-OR gate. The peak detector square-wave signal is also applied to a shift register which, after a time delay, applies the same signal to another input of the exclusive-OR gate. With these connections, the exclusive-OR gate produces a square-wave output whose duty cycle is proportional to the speed of the DC motor. This output can then be either amplified and applied directly to the electric motor to drive it, or integrated and applied to an amplifier to drive the motor in accordance with standard servo techniques.
    • 公开了用于电子控制电动机的操作的伺服电路。 电机的转速通过转速计转换成变化的频率波形。 转速计输出应用于转换电路,转换电路包括将转速表的输出波形转换为方波信号的峰值检测器。 方波信号又连接到异或门的一个输入。 峰值检测器方波信号也被施加到移位寄存器,该移位寄存器在时间延迟之后将相同的信号施加到异或门的另一个输入。 通过这些连接,异或门产生方波输出,其占空比与直流电机的速度成比例。 然后可以将该输出放大并直接施加到电动机以驱动它,或者将其整合并施加到放大器以根据标准伺服技术驱动电动机。
    • 5. 发明授权
    • Pixel data formatting
    • 像素数据格式
    • US5128658A
    • 1992-07-07
    • US211778
    • 1988-06-27
    • James L. PappasLarry D. SeilerRobert C. Rose
    • James L. PappasLarry D. SeilerRobert C. Rose
    • G09G5/02G09G5/06G09G5/14
    • G09G5/026G09G5/06G09G5/14
    • Pixel formats and a pixel mapping unit for use in a computer graphics terminal which provides an address input to a color look-up table. The disclosed pixel formats can be used to conserve frame buffer memory, color table memory, or both. For example, the formats support pseudo color or full color mapping, overlay planes, and color table bank select while using a minimum amount of memory. A valid plane feature is also supported, which can be used to enable rapid clearing of a window. The pixel mapping unit is especially handy in supporting multiple windows, because a unique mapping configuration word, which specifies how pixels are to be interpreted, may be specified for each window.
    • 像素格式和用于计算机图形终端中的像素映射单元,其为颜色查找表提供地址输入。 所公开的像素格式可用于节省帧缓冲存储器,色表存储器或两者。 例如,格式支持伪彩色或全色映射,重叠平面和彩色表格库选择,同时使用最小量的内存。 还支持有效的平面功能,可用于快速清除窗口。 像素映射单元特别方便地支持多个窗口,因为可以为每个窗口指定唯一的映射配置字,其指定如何解释像素。
    • 6. 发明授权
    • Semaphore controlled video chip loading in a computer video graphics
system
    • 信号量控制视频芯片加载在计算机视频图形系统中
    • US5058041A
    • 1991-10-15
    • US206203
    • 1988-06-13
    • Robert C. RoseLarry D. SeilerJames L. Pappas
    • Robert C. RoseLarry D. SeilerJames L. Pappas
    • G09G5/14G09G5/395
    • G09G5/395G09G5/14
    • A method and apparatus for updating the copies of state table values of a video data path chip set for a computer graphics system is provided. The apparatus uses off screen bitmap memory or other dual-ported memory in a frame buffer to store a shadow copy of the state that is stored in the video data path chips. The state tables include such things as color lookup tables, window definitions and cursors. A semaphore is used to prevent screen glitches caused by updating state tables from the copy of state table values that are partially modified. The state tables are loaded into the chips during vertical retrace, when the screen is being blanked. Before the CPU begins to update the shadow copy in the frame buffer, it claims the semaphore. If a vertical retrace occurs before the CPU has completed updating the frame buffer, the chips are not loaded during that vertical retrace. Before the chips start loading, a system timing chip claims the semaphore. The CPU cannot commence modifying the frame buffer until the load is finished.
    • 提供了一种用于更新计算机图形系统的视频数据路径芯片组的状态表值的副本的方法和装置。 该设备使用屏幕位图存储器或帧缓冲器中的其他双端口存储器来存储存储在视频数据路径芯片中的状态的影子副本。 状态表包括颜色查找表,窗口定义和光标等。 信号量用于防止从部分修改的状态表值的副本更新状态表导致的屏幕故障。 当屏幕被消隐时,状态表在垂直回扫期间加载到芯片中。 在CPU开始更新帧缓冲区中的卷影副本之前,它会声明信号量。 如果在CPU完成更新帧缓冲区之前发生垂直回扫,则在该垂直回扫期间芯片不会被加载。 在芯片开始加载之前,系统定时芯片要求信号量。 在负载完成之前,CPU无法开始修改帧缓冲区。