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    • 9. 发明申请
    • DIGITAL-TO-DIGITAL CONVERSION USING NONUNIFORM SAMPLE RATES
    • 数字到数字转换使用非统计量样本率
    • WO1995031860A1
    • 1995-11-23
    • PCT/US1995003739
    • 1995-03-23
    • ANALOG DEVICES, INC.WILSON, JamesCELLINI, Ronald, A.SOBOL, James, M.
    • ANALOG DEVICES, INC.
    • H03H17/06
    • H03H17/0628H03H17/0614H03L7/08H03L7/093H03L7/0992H03L2207/50
    • A method and apparatus for digital-to-digital conversion using sigma-delta modulation of the temporal spacing between digital samples. The method and apparatus of the present invention provides for sigma-delta modulation of the time base such that noise produced by nonuniform sampling are frequency-shaped to a region (i.e., shifted to higher frequencies) where it can be removed by conventional filtering techniques. In one embodiment, the digital data is interpolated (16) by fixed ratio and then decimated (21) under control of a first sigma-delta modulated frequency selection signal (26) that represents, on average, the data rate of the incoming digital data stream. Thereafter, the digital data is interpolated (30) under control of a second sigma-delta modulated frequency selection signal (46) that represents, on average, the data rate of the digital data to be output by the converter and then decimated (40) by a fixed ratio. In another embodiment, the digital data is interpolated under control of a first sigma-delta modulated frequency selection signal that represents, on average, the data rate of the incoming digital data stream and then decimated by a fixed ratio. Thereafter, the digital data is interpolated by a fixed ratio and then decimated under control of a second sigma-delta modulated frequency selection signal that represents, on average, the data rate of the digital data to be output by the converter. The first and second frequency signal selection numbers are modulated using n-th order m-bit sigma-delta modulators. The method and apparatus converts the data rate of the incoming digital data stream to the data rate of the first n-th m-bit sigma-delta modulator and then converts the digital data stream from the first sigma-delta modulator (20) to an output data rate determined by the second n-th order m-bit sigma-delta modulator (32).
    • 一种使用数字样本之间的时间间隔的Σ-Δ调制进行数模转换的方法和装置。 本发明的方法和装置提供了时基的Σ-Δ调制,使得由不均匀采样产生的噪声被频率形成为可以通过常规滤波技术去除的区域(即,移位到较高频率)。 在一个实施例中,数字数据以固定比例内插(16),然后在第一Σ-Δ调制频率选择信号(26)的控制下抽取(21),平均来说代表输入数字数据的数据速率 流。 此后,数字数据在第二Σ-Δ调制频率选择信号(46)的控制下被内插(30),第二Σ-Δ调制频率选择信号平均表示要由转换器输出的数字数据的数据速率,然后抽取(40) 按固定比例。 在另一实施例中,数字数据在第一Σ-Δ调制频率选择信号的控制下进行内插,该第一Σ-Δ调制频率选择信号平均表示输入数字数据流的数据速率,然后以固定比率抽取。 此后,数字数据以固定比例内插,然后在第二Σ-Δ调制频率选择信号的控制下抽取,该第二Σ-Δ调制频率选择信号平均表示要由转换器输出的数字数据的数据速率。 第一和第二频率信号选择号码使用n阶m位Σ-Δ调制器进行调制。 该方法和装置将输入数字数据流的数据速率转换为第一n位m位Σ-Δ调制器的数据速率,然后将来自第一Σ-Δ调制器(20)的数字数据流转换为 由第二n位m位Σ-Δ调制器(32)确定的输出数据速率。