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    • 2. 发明授权
    • Data compression/decompression processor
    • 数据压缩/解压缩处理器
    • US5410671A
    • 1995-04-25
    • US66317
    • 1993-05-21
    • Taher A. ElgamalDaniel D. ClaxtonRobert F. Honea
    • Taher A. ElgamalDaniel D. ClaxtonRobert F. Honea
    • G06T9/00H03M7/30G06F12/02
    • H03M7/3088G06T9/005
    • A data compression/decompression processor (a single-chip VLSI data compression/decompression engine) for use in applications including but not limited to data storage and communications. The processor is highly versatile such that it can be used on a host bus or housed in host adapters, so that all devices such as magnetic disks, tape drives, optical drives and the like connected to it can have substantial expanded capacity and/or higher data transfer rate. The processor employs an advanced adaptive data compression algorithm with string-matching and link-list techniques so that it is completely adaptive, and a dictionary is constructed on the fly. No prior knowledge of the statistics of the characters in the data is needed. During decompression, the dictionary is reconstructed at the same time as the decoding occurs. The compression converges very quickly and the compression ratio approaches the theoretical limit. The processor is also insensitive to error propagation.
    • 一种用于包括但不限于数据存储和通信的应用的数据压缩/解压缩处理器(单芯片VLSI数据压缩/解压缩引擎)。 处理器是非常通用的,使得其可以在主机总线上使用或容纳在主机适配器中,使得连接到其的所有设备(例如磁盘,磁带驱动器,光驱动器等)可以具有相当大的扩展容量和/或更高 数据传输率。 处理器采用具有字符串匹配和链接列表技术的高级自适应数据压缩算法,使其完全自适应,并且即时构建字典。 不需要有关数据中字符统计的事先知识。 在解压缩期间,在解码发生的同时重建字典。 压缩非常快速地收敛,压缩比接近理论极限。 处理器对错误传播也不敏感。
    • 3. 发明授权
    • Method and apparatus for calibrating a resistive ladder switching matrix
    • 校准电阻式梯形图开关矩阵的方法和装置
    • US06178388B1
    • 2001-01-23
    • US09191200
    • 1998-11-13
    • Daniel D. Claxton
    • Daniel D. Claxton
    • H03K1794
    • H03M11/24H04M1/0214H04M1/0245H04M1/23
    • A method and apparatus for calibrating a resistive ladder switching matrix coupled to a keypad in a portable electronic device having a housing with a cover that may be positioned in an open state or a closed state. A first contact of a calibration element is coupled to a reference voltage and a second contact of the calibration element is coupled to ground by moving the cover from the open state to the closed state. When the first contact of the calibration element is coupled to the reference voltage and the second contact of the calibration element is coupled to ground, a calibration resistance across the calibration element is determined. The calibration resistance may correspond to an input impedance of the resistive ladder switching matrix when no buttons associated with the keypad are depressed. Signals from the resistive ladder switching network are calibrated when the cover is in the closed state in accordance with the calibration resistance.
    • 一种用于校准耦合到便携式电子设备中的键盘的电阻梯形开关矩阵的方法和装置,该便携式电子设备具有壳体,该壳体可以位于打开状态或闭合状态。 校准元件的第一接触耦合到参考电压,并且通过将盖从打开状态移动到关闭状态,校准元件的第二接触耦合到地面。 当校准元件的第一接触耦合到参考电压并且校准元件的第二接触耦合到地时,确定跨校准元件的校准电阻。 当没有与键盘相关联的按钮被按下时,校准电阻可以对应于电阻梯形图切换矩阵的输入阻抗。 当电阻梯形开关网络的信号根据校准电阻处于闭合状态时进行校准。