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    • 6. 发明授权
    • Method and apparatus for switching between radio frequency circuits
    • 用于在射频电路之间切换的方法和装置
    • US5481571A
    • 1996-01-02
    • US150728
    • 1993-11-12
    • Kumar BalachandranRoy F. Quick, Jr.
    • Kumar BalachandranRoy F. Quick, Jr.
    • H04B7/08H04Q7/22H04B17/02
    • H04B7/0814
    • An RF circuit switch system having particular use in an antenna diversity scheme for a CDPD system relies upon a comparison between current signal values on a selected antenna and a predetermined value based upon previous signal values measured on the same antenna. This comparison determines whether switching will occur from one antenna to another. Normally, the predetermined value will be adjusted based upon present signal strength on the selected antenna. Switching is normally attempted when there is a drop of approximately 10 dB in the signal strength of the selected antenna. If the signal strength in the other antenna is found to be less than that of the original antenna upon switching, an automatic switch back is carried out.
    • 在用于CDPD系统的天线分集方案中特别有用的RF电路开关系统依赖于基于在同一天线上测量的先前信号值在选定天线上的电流信号值与预定值之间的比较。 该比较确定是否从一个天线到另一个天线发生切换。 通常,将基于所选天线上的当前信号强度来调整预定值。 当所选天线的信号强度下降约10dB时,通常会尝试切换。 如果在切换时发现另一天线的信号强度小于原始天线的信号强度,则执行自动切换。
    • 7. 发明授权
    • Method of electronically moving portions of several different images on
a CRT screen
    • 在CRT屏幕上电子地移动几个不同图像的部分的方法
    • US4559533A
    • 1985-12-17
    • US548551
    • 1983-11-03
    • Leland J. BassRoy F. Quick, Jr.Ashwin V. ShahRalph O. Wickwire
    • Leland J. BassRoy F. Quick, Jr.Ashwin V. ShahRalph O. Wickwire
    • G09G5/14G09G1/00
    • G09G5/14
    • A method of electronically moving portions of several different images on a CRT screen includes the steps of: storing a first image in one section of an image memory, and storing a second image in a different section of the image memory; storing control bits in a control memory which define high and low priority viewports on the screen and correlate portions of the first and second images to the high and low priority viewports respectively; displaying, in response to the stored control bits, the entire portion of the image in the high priority viewport and only the non-overlapping portion of the image in the low priority viewport by transferring the image portions from the image memory to the screen with no frame buffer therebetween; modifying at least some of the stored control bits to change the priorities of the high and low priority viewports to low and high respectively; and repeating the displaying step, in response to the modified control bits, to display the entire portion of the image in the new high priority viewport and only the non-overlapping portion of the image in the new low priority viewport.
    • 一种在CRT屏幕上电子地移动几个不同图像的部分的方法包括以下步骤:将第一图像存储在图像存储器的一个部分中,并将第二图像存储在图像存储器的不同部分中; 将控制位存储在控制存储器中,所述控制存储器在屏幕上定义高优先级和低优先级的视口,并将第一和第二图像的部分分别与高优先级和低优先级视口相关联; 通过将图像存储器中的图像部分从图像存储器传送到屏幕而在高优先级视口中的整个部分响应于所存储的控制位,并且仅显示低优先级视口中的图像的非重叠部分 帧缓冲器; 修改至少一些所存储的控制位以分别将高优先级和低优先级视口的优先级改变为低和高优先级视口; 并且响应于修改的控制位重复显示步骤,以在新的高优先级视口中显示图像的整个部分,并且仅在新的低优先级视口中显示图像的非重叠部分。