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    • 8. 发明授权
    • Scrambler with built in test capabilities for unary DAC
    • 具有一体化DAC的内置测试功能的加扰器
    • US09124287B1
    • 2015-09-01
    • US14580099
    • 2014-12-22
    • PMC-SIERRA US, INC.
    • Stanley HoWilliam Michael Lye
    • H03M1/10H03M1/66G01R31/3167H03M1/06H03M7/02
    • G01R31/3167H03M1/0673H03M1/109H03M1/66H03M7/02H03M7/165H03M7/22
    • An apparatus comprising a scrambler having a plurality of scrambler inputs and 2N scrambler outputs, and a unary-weighted digital to analog converter (DAC) connected to scrambler to generate an analog output signal based on the 2N scrambler outputs. The scrambler has N unique scrambling stages arranged in order between the scrambler inputs and the scrambler outputs from a first scrambling stage to a last scrambling stage. Each of the N unique scrambling stages has a plurality of stage inputs and outputs, with the stage inputs of the first scrambling stage connected to the scrambler inputs, the stage outputs of each scrambling stage except the last scrambling stage connected to the stage inputs of a next scrambling stage, and the stage outputs of the last scrambling stage connected to the scrambler outputs. Each of the N unique scrambling stages is operable to pass signals at the inputs to the outputs in either an unscrambled or scrambled state under control of a control bit provided by an N-bit entropy signal. When an N+1 bit input signal is applied to the scrambler inputs and the N-bit entropy signal is randomized the analog output signal from the DAC has improved linearity compared to the analog output signal generated from a non-scrambled input, and when a test input signal is applied to the scrambler inputs and the entropy signal is swept through 2N orthogonal values the analog output signal from the DAC indicates whether a fault exists in one of the scrambler and the DAC.
    • 一种包括具有多个加扰器输入和2N个加扰器输出的加扰器的装置,以及连接到加扰器的一次加密数模转换器(DAC),以基于2N个加扰器输出产生模拟输出信号。 加扰器具有N个唯一的加扰阶段,其按扰频器输入和从第一加扰阶段到最后加扰阶段的加扰器输出之间的顺序排列。 N个唯一加扰阶段中的每一个具有多个级输入和输出,其中第一加扰级的级输入连接到加扰器输入,除了与第一加扰级相连的第一加扰级之外的每个加扰级的级输出 下一个加扰阶段,以及连接到加扰器输出的最后一个加扰级的级输出。 N个唯一加扰级中的每一个可操作以在由N位熵信号提供的控制位的控制下以未加扰或加扰状态将输入处的信号传递到输出。 当将N + 1位输入信号施加到扰频器输入并且N位熵信号被随机化时,与从非加扰输入产生的模拟输出信号相比,来自DAC的模拟输出信号具有改善的线性度,并且当 测试输入信号被施加到加扰器输入,并且熵信号通过2N个正交值扫描,来自DAC的模拟输出信号指示在扰频器和DAC之一中是否存在故障。
    • 10. 发明申请
    • Method of transforming geographic coordinate
    • 变换地理坐标的方法
    • US20100289675A1
    • 2010-11-18
    • US12010924
    • 2008-01-31
    • Naoki Ueda
    • Naoki Ueda
    • H03M7/02
    • G09B29/10G01C21/20G09B29/00
    • A method of transforming a geographic coordinate to a geographic location code includes the steps of: retrieving a latitude value and a longitude value of the geographic coordinate; quantizing the latitude value to a first integer value; quantizing the longitude value to a second integer value; converting the first integer value to a first code string, said first code string including a first digit representing a non-numeric character, a second digit representing a non-numeric character, and a third digit representing a numeric character; converting the second integer value to a second code string, said second code string including a fourth digit representing a non-numeric character, a fifth digit representing a non-numeric character, and a sixth digit representing a numeric character; and combining the first code string and the second code string to obtain the geographic location code having a fixed pattern of radix in a mixed radix notation system representation.
    • 将地理坐标变换为地理位置码的方法包括以下步骤:检索地理坐标的纬度值和经度值; 将纬度值量化为第一个整数值; 将经度值量化为第二整数值; 将所述第一整数值转换为第一代码串,所述第一代码串包括表示非数字字符的第一数字,表示非数字字符的第二数字和表示数字字符的第三数字; 将所述第二整数值转换为第二代码串,所述第二代码串包括表示非数字字符的第四数字,表示非数字字符的第五数字和表示数字字符的第六数字; 以及组合所述第一代码串和所述第二代码串,以获得具有固定模式的基数的地理位置代码。