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    Conversion employing delta-sigma modulation
    2.
    发明公开
    Conversion employing delta-sigma modulation 有权
    Wandlungsystem mit Delta-Sigma-Modulation

    公开(公告)号：EP1487111A1

    公开(公告)日：2004-12-15

    申请号：EP03025703.4

    申请日：2003-11-07

    申请人： Northrop Grumman Corporation

    发明人： Robinson, Ian Stuart ,  Hinrichs, Jeffrey M. ,  Weber, Kenneth B. ,  Patel, Jasmine Upendra ,  MacFalda, Paul Charles ,  Skones, William Marvin

    IPC分类号： H03M3/02

    CPC分类号： H03M3/50

    摘要： Signal conversion of an input signal can be achieved by processing portions of the signal through plural parallel paths, which collectively approximate a desired infinite impulse response (IIR) filter, either alone or implemented with other signal processing functions. In one aspect, each of the paths can perform filtering, noise-shaping and/or quantization on a respective portion of the input signal to provide a corresponding representation of the respective portion of the input signal, for example, a coarser representation at a higher data rate. The corresponding representations from the parallel paths can be aggregated and further processed in a desired manner, such as conversion to an analog signal.

    摘要翻译： 输入信号的信号转换可以通过多个并行路径来处理信号的部分来实现，这些并行路径共同接近期望的无限脉冲响应（IIR）滤波器，或者用其他信号处理功能实现。 在一个方面，每个路径可以在输入信号的相应部分上执行滤波，噪声整形和/或量化，以提供输入信号的相应部分的相应表示，例如较高的较大的表示 数据速率。 来自并行路径的相应表示可以以期望的方式聚合并进一步处理，例如转换为模拟信号。

    Look-up table delta-sigma conversion
    4.
    发明公开
    Look-up table delta-sigma conversion 有权
    Delta-Sigma-Wandlung mit Hilfe einer Nachschlagtabelle

    公开(公告)号：EP1492239A1

    公开(公告)日：2004-12-29

    申请号：EP03025731.5

    申请日：2003-11-10

    申请人： Northrop Grumman Corporation

    发明人： Robinson, Ian Stuart ,  Hinrichs, Jeffrey M. ,  Patel, Jasmine Upendra ,  MacFalda, Paul Charles ,  Dehmohseni, Reza ,  Harris, Frederic J. ,  Weber, Kenneth B.

    IPC分类号： H03M3/02

    CPC分类号： H03M7/3015

    摘要： Signal conversion is implemented employing a memory system operating as a look-up table that stores a plurality of sets of output samples associated with each of a plurality of respective input samples. The look-up table thus can generate a corresponding set of output samples in response to a given input sample, thereby emulating desired digital upsampling and delta-sigma modulation. The output samples can be aggregated, such as by multiplexing, to provide an output data stream at a desired sample rate.

    摘要翻译： 该系统具有一个具有查找表（18）的存储器系统，该查找表被编程为存储由作为输入样本（16）的函数定义的地址数据索引的输出数据。 地址数据在功能上与由表格表示的三角波调制的状态信息和输出有关。 该表提供一组输出样本（20）作为基于输入样本的输出向量。 聚集器（22）聚集样品（20）。

    Digital frequency synthesiser
    7.
    发明公开
    Digital frequency synthesiser 有权
    数字频率合成

    公开(公告)号：EP1491984A1

    公开(公告)日：2004-12-29

    申请号：EP03025729.9

    申请日：2003-11-10

    申请人： Northrop Grumman Corporation

    发明人： Robinson, Ian Stuart ,  Hinrichs, Jeffrey M. ,  Weber, Kenneth B.

    IPC分类号： G06F1/02

    CPC分类号： H03M7/3015 ,  G06F1/0321

    摘要： Frequency synthesis is implemented by providing a delta-sigma modulated signal associated with a selected frequency, which frequency can vary based on a selection input. The delta-sigma modulated signal is converted from the digital to analog domain. The delta-sigma modulated signal can be provided directly from memory based on the selection input or, alternatively, it can be provided by a signal generator and processed by a delta-sigma modulator to provide the delta-sigma modulated signal. The selected frequency can be varied at a high rate of speed.

    摘要翻译： 合成器具有用于基于频率选择输入提供存储在存储器中的若干频率图案（12）的频率源。 数模（DAC）转换器（18）接收与所选模式相关联的Δ-Σ调制信号。 存储器将选择的模式提供为多位数据流。 DAC转换器将调制信号转换为相应的模拟信号。