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    • 1. 发明授权
    • High resolution character generator
    • 高分辨率字符发生器
    • US4079458A
    • 1978-03-14
    • US713545
    • 1976-08-11
    • Ronald E. RiderButler W. Lampson
    • Ronald E. RiderButler W. Lampson
    • G06K15/12G09G5/24G09G5/42G06F3/14
    • G09G5/42G06K15/128G09G5/24
    • High resolution character generator for producing rows of characters to be scanned on a display medium. Input data defining characters to be printed in ordered rows of text is sorted to provide specifications for the characters which being on each successive scan line. These specifications are stored initially in an input buffer, and specifications for characters which have been partially printed in a previous scan line are stored in an active character buffer. For each scan line, the character specifications are read first from the active character buffer and then from the input buffer until an end of line specifier is reached. For each character specification received, a font memory containing data defining the characters is cycled. The data from the font memory is decoded and presented to the display medium on a line by line basis.
    • 用于产生要在显示介质上扫描的字符行的高分辨率字符发生器。 定义要按有序行文字打印的字符的输入数据进行排序,以便为每个连续扫描行上的字符提供规格。 这些规范最初存储在输入缓冲器中,并且已经部分地打印在先前扫描行中的字符的规格被存储在活动字符缓冲器中。 对于每条扫描线,首先从活动字符缓冲区读取字符规格,然后从输入缓冲区读取字符规格,直到到达行尾说明符。 对于接收到的每个字符规范,循环包含定义字符的数据的字体存储器。 来自字体存储器的数据被解码并逐行呈现给显示介质。
    • 3. 发明授权
    • Adapter for raster output scanning printer
    • 光栅输出扫描打印机适配器
    • US4279002A
    • 1981-07-14
    • US899137
    • 1978-04-24
    • Ronald E. Rider
    • Ronald E. Rider
    • G06F3/12G06K15/12H04N1/23H04N1/32H04N1/36
    • G06K15/128
    • An adapter is provided as an interface between a raster output scanning printer and an electronic image processor which formats digital information for use by the printer in creating printed images. The adapter accepts digital pulses through a structured array of communication lines from the electronic image processor. Each line is dedicated to the provision of certain video or control information which may be utilized by any one of a number of different raster output scanning printers. The electronic image processor is indifferent to the identity of the type of printer to which information is provided as the adapter serves to manipulate the data provided by the electronic image processor in a manner suitable to control the particular printer employed. The adapter is sensitive to the scanning cycles of the printer and accommodates deviations in scan time to increase or decrease the rate of provision of video information in accordance with fluctuations in printer motor speed. A phase lock loop with the printer motor is provided for this purpose. The adapter also multiplexes status information of operating conditions generated internally and from the printer, and serially sends this status information to the electronic image processor.
    • 提供适配器作为光栅输出扫描打印机和电子图像处理器之间的接口,其格式化数字信息以供打印机在创建打印图像时使用。 适配器通过来自电子图像处理器的通信线路的结构化阵列接受数字脉冲。 每条线专用于提供可由多个不同的光栅输出扫描打印机中的任何一个使用的某些视频或控制信息。 电子图像处理器对于适配器用于以适合于控制所使用的特定打印机的方式来操纵由电子图像处理器提供的数据的打印机类型的身份无动于衷。 适配器对打印机的扫描周期敏感,并适应扫描时间的偏差,以根据打印机电机速度的波动增加或减少视频信息的提供速率。 为此,提供了带有打印机电机的锁相环。 适配器还多路复用内部生成的操作条件和打印机的状态信息,并将该状态信息串行发送到电子图像处理器。
    • 7. 发明授权
    • Hybrid bit clock servo
    • 混合位时钟伺服
    • US4320420A
    • 1982-03-16
    • US165813
    • 1980-07-03
    • Ronald E. Rider
    • Ronald E. Rider
    • H04N1/113B41J2/44G03G15/04H04N1/053H04N1/04
    • H04N1/053H04N1/1135H04N2201/0471H04N2201/04775
    • A circuit for controlling the clock rate separately for each facet of a polygon used in a laser driven raster output scanner. The clock rate for facet #0 is servoed using a first order integrator (11) driven by a digital correction circuit which compares the actual number of pulses against the required number, and produces therefrom an analog correction pulse width which is applied to the integrator (11). A second order integrator (19) is used to compensate for leakage of charge from the parallel capacitor of the first order integrator (11), to improve performance. The remaining facets are then corrected for by assigning to each an individual correction voltage. This correction voltage is generated by counting clock pulses for each additional facet and using these pulse totals to generate individual analog correction voltages which are added to, or subtracted from the facet #0 voltage in an adder (18) which combines the facet #0 correction voltage with each individual voltage in sequence. The result is a relatively simple and inexpensive circuit that compensates for facet signature errors, as well as errors produced by drive motor hunting.
    • 用于在激光驱动的光栅输出扫描器中使用的多边形的每一个面分别控制时钟频率的电路。 使用由数字校正电路驱动的第一阶积分器(11)对面#0的时钟速率进行伺服,该数字校正电路将实际脉冲数与所需数量进行比较,并由此产生施加到积分器的模拟校正脉冲宽度 11)。 二阶积分器(19)用于补偿来自一阶积分器(11)的并联电容器的电荷泄漏,以提高性能。 然后通过分配每个单独的校正电压来校正剩余的面。 该校正电压通过对每个附加小面进行计数时钟脉冲并使用这些脉冲总数来产生单独的模拟校正电压来产生,所述各个模拟校正电压被加到加法器(18)中的或从小面#0电压中减去,该加法器组合了小面#0校正 每个电压按顺序进行。 结果是相对简单和廉价的电路,补偿了小平面签名错误,以及由驱动马达打猎产生的错误。