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    • 1. 发明申请
    • SYSTEMS AND METHODS FOR CONTROLLING TRANSIENT RESPONSE IN THE OUTPUT OF A NOISE SHAPER
    • 用于控制噪声形状输出中的瞬态响应的系统和方法
    • WO2007084894A2
    • 2007-07-26
    • PCT/US2007/060574
    • 2007-01-16
    • D2AUDIO CORPORATIONANDERSEN, Jack, B.
    • ANDERSEN, Jack, B.
    • H03M3/00
    • H03M7/3011H03M7/3026
    • Systems and methods implemented in a multi-bit digital noise shaper for reducing or eliminating undesirable transient response when the noise shaper exits a clipping state. In one embodiment, die noise shaper includes a quantizer, a filter, and a filter control unit that detects clipping in the quantizer and dynamically adjusts the allowable range of the internal state values of the filter. In one embodiment, a clipping mechanism is provided for each state value within the filter to clip the state value if it exceeds a corresponding clipping level. The clipping level for each state value is lower when the quantizer is clipping, and higher when the quantizer is not clipping. The clipping level for each state value may be transitioned either immediately or gradually from a current level to a target level (which is lower when the quantizer is clipping, and higher when die quantizer is not clipping).
    • 在多位数字噪声整形器中实现的用于在噪声整形器退出限幅状态时减少或消除不期望的瞬态响应的系统和方法。 在一个实施例中,管芯噪声整形器包括量化器,滤波器和滤波器控制单元,其检测量化器中的限幅并动态地调整滤波器的内部状态值的允许范围。 在一个实施例中,为滤波器内的每个状态值提供限幅机构,以在状态值超过相应的限幅电平时剪切状态值。 当量化器被削波时,每个状态值的限幅电平较低,当量化器未被削波时,限幅电平较高。 每个状态值的限幅电平可以从当前电平立即或逐渐转换到目标电平(当量化器被削波时较低,而当量子化器未被削波时,该电平更高)。
    • 2. 发明申请
    • ディジタル信号処理装置及びディジタル信号処理方法
    • 数字信号处理设备和数字信号处理方法
    • WO2004015872A1
    • 2004-02-19
    • PCT/JP2003/009614
    • 2003-07-29
    • ソニー株式会社野口 雅義市村 元鈴木 伸和
    • 野口 雅義市村 元鈴木 伸和
    • H03M3/02
    • H03M7/3011H03M7/3028H03M7/304
    •  本発明は、ΔΣ変調装置を用いて1ビット信号出力を導出するためのディジタル信号処理装置であり、第6積分器(30)の積分出力を量子化し、加算器(34)を介して各積分器の入力に帰還しながら1ビット信号出力を生成して6次のΔΣ変調器(3)の外部に導出する量子化器(33)と、1ビット信号出力のオーディオ帯域の信号成分の信号レベルを可変させるために量子化器(33)からのフィードバックループ信号を制御する制御信号を生成する制御部(4)を備える。制御部(4)は、6次のΔΣ変調器(3)の入力側の積分器である第2積分器(14)からの積分出力を取り出す。
    • 一种用于通过使用DeltaSigma调制装置输出1比特信号的数字信号处理装置包括:用于量化第六积分器(30)的积分输出的量化装置(33),产生1比特信号输出,同时将其送回 经由加法器(34)输入到每个积分器的输入端,并将该信号输出到6维ΔΣ调制装置(3)外部。 以及控制部分(4),用于产生用于控制来自量化装置(33)的反馈信号的控制信号,用于改变1位信号输出的音频频带的信号分量的信号电平。 控制部分(4)从作为6维ΔΣ调制装置(3)的输入侧的积分器的第二积分器(14)提取积分输出。
    • 4. 发明申请
    • SIGMA DELTA MODULATORS
    • SIGMA DELTA调制器
    • WO2007010298A1
    • 2007-01-25
    • PCT/GB2006/050175
    • 2006-06-29
    • QUEEN MARY & WESTFIELD COLLEGESANDLER, Mark BrianREISS, Joshua Daniel
    • SANDLER, Mark BrianREISS, Joshua Daniel
    • H03M3/00H03M7/32H03M7/36
    • H03M7/3011H03M3/362H03M3/422H03M3/438H03M7/3037
    • A method is provided for detecting limit cycles in a sigma delta modulator having an output signal that varies over a series of time intervals. In this method a first value that is indicative of the level of the modulator output signal after a predetermined time interval is stored in a first memory, and a second value that is indicative of the level of the modulator output signal after a further time interval subsequent to the predetermined time interval is stored in a second memory. The first value stored in the first memory is compared with the second value stored in the second memory, and an output indicative of a tendency for limit cycles to be produced in the modulator output signal is provided in response to such comparison. Such a method is particularly advantageous for detecting limit cycles in a sigma delta modulator as it can be implemented in a straightforward manner and offers a very accurate limit cycle detection mechanism. As a result it only becomes necessary to activate a limit cycle removal mechanism when limit cycle behaviour has been observed, and major changes to design are not normally required to implement the detection mechanism.
    • 提供了一种用于检测具有在一系列时间间隔上变化的输出信号的Σ-Δ调制器中的极限周期的方法。 在该方法中,将指示预定时间间隔之后的调制器输出信号的电平的第一值存储在第一存储器中,以及指示后续时间间隔之后的调制器输出信号电平的第二值 到预定时间间隔被存储在第二存储器中。 存储在第一存储器中的第一值与存储在第二存储器中的第二值进行比较,并且响应于这种比较,提供表示在调制器输出信号中产生极限周期趋势的输出。 这种方法对于在Σ-Δ调制器中检测极限循环特别有利,因为它可以以直接的方式实现并提供非常精确的极限循环检测机制。 因此,仅当观察到极限循环行为时才需要激活极限循环去除机构,并且通常不需要对设计的主要改变来实现检测机制。
    • 5. 发明申请
    • LOOK-AHEAD DELTA SIGMA MODULATOR WITH QUANTIZATION USING NATURAL PATTERN LOOP FILTER RESPONSES
    • 使用自然图案循环滤波器响应的LEAE DELTA SIGMA调制器与量化
    • WO2005074142A1
    • 2005-08-11
    • PCT/US2005/001094
    • 2005-01-13
    • CIRRUS LOGIC, INC.
    • MELANSON, John, L.
    • H03M7/00
    • H03M7/3011
    • A look-ahead delta sigma modulator reduces and simplifies the computations used to generate quantizer output values. Superposition can be applied to a loop filter response of the look-ahead delta sigma modulator. By superposition, the complete loop filter response for each output candidate vector equals the difference between a forced pattern response and a natural input signal response. The forced pattern response of the loop filter can be determined from the response to each output candidate vector with an input signal set to zero and loop filter state variables initially set to zero when determining the loop filter response for each output candidate vector. The natural input signal response of the loop filter can be determined from the response to each input signal vector with feedback data set to zero. The forced pattern response is independent of the output signal data and can be determined once for all input signal vectors x t . The natural input signal rsponse is independent of the feedback data and, therefore, need only be determined once for each output data value.
    • 先行的delta-Σ调制器减少并简化了用于产生量化器输出值的计算。 叠加可以应用于前瞻delta-Σ调制器的环路滤波器响应。 通过叠加,每个输出候选矢量的完整环路滤波器响应等于强制模式响应和自然输入信号响应之间的差异。 环路滤波器的强制模式响应可以从输入信号设置为零的每个输出候选矢量的响应确定,并且当确定每个输出候选矢量的环路滤波器响应时,环路滤波器状态变量初始设置为零。 环路滤波器的自然输入信号响应可以从反馈数据设置为零的每个输入信号矢量的响应确定。 强制模式响应与输出信号数据无关,可以为所有输入信号向量xt确定一次。 自然输入信号响应与反馈数据无关,因此,仅需为每个输出数据值确定一次。
    • 9. 发明申请
    • SIGNAL PROCESSING WITH LOOK-AHEAD MODULATOR NOISE QUANTIZATION MINIMIZATION
    • 信号处理与前瞻性调制器噪声量化最小化
    • WO2005074141A1
    • 2005-08-11
    • PCT/US2005/001093
    • 2005-01-13
    • CIRRUS LOGIC, INC.
    • MELANSON, John, L.
    • H03M7/00
    • H03M7/3011
    • A signal processing system includes a look-ahead delta-sigma modulator (500) that processes multiple output candidate vectors (Yi) and an input vector (Xi) to determine a quantization error vector for each output candidate vector. In one embodiment, the quantization error vector represents a difference between a cost value vector and an input candidate vector. Look-ahead delta-sigma modulator output values are selected using the quantization error vectors (Ci-Yi) by, for example, determining the minimum power quantization error vector for each input vector X and selecting the output value from the input candidate vector associated with the minimum power quantization error vector. Quantization error vectors can also be weighted using a non-uniform weighting vector.
    • 信号处理系统包括处理多个输出候选向量(Yi)的前瞻delta-sigma调制器(500)和输入向量(Xi),以确定每个输出候选向量的量化误差向量。 在一个实施例中,量化误差矢量表示成本值矢量和输入候选矢量之间的差。 通过例如确定每个输入向量X的最小功率量化误差向量,并使用量化误差向量(Ci-Yi)来选择前视Δ-Σ调制器输出值,并从与 最小功率量化误差向量。 量化误差向量也可以使用不均匀加权矢量进行加权。
    • 10. 发明申请
    • JOINTLY NONLINEAR DELTA SIGMA MODULATORS
    • 高性能非线性DELTA SIGMA调制器
    • WO2005074140A1
    • 2005-08-11
    • PCT/US2005/001092
    • 2005-01-13
    • CIRRUS LOGIC, INC.
    • MELANSON, John, L.
    • H03M7/00
    • H03M7/3013H03M7/3011H03M7/3028H03M7/304
    • A signal processing system includes a jointly non-linear delta sigma modulator (1002). In one embodiment, the jointly non-linear delta sigma modulator includes a non-linear quantization transfer function, and the output of the delta sigma modulator is defined, at least in part, by a non-linear interrelationship of multiple noise-shaping filter state variables (SVi). A look-ahead delta-sigma modulator can be implemented as a noise shaping filter and a function generator. State variables of the noise shaping filter provide the input data from which the function generator determines a quantizer output signal. Latter state variables are more dominant in determining the quantizer output signal. Accordingly, earlier state variables can be approximated to a greater degree than latter state variables without significant compromise in quantization accuracy.
    • 信号处理系统包括联合非线性Δ-Σ调制器(1002)。 在一个实施例中,联合非线性Δ-Σ调制器包括非线性量化传递函数,并且ΔΣ调制器的输出至少部分地由多个噪声整形滤波器状态的非线性相互关系 变量(SVi)。 先行的delta-sigma调制器可以被实现为噪声整形滤波器和函数发生器。 噪声整形滤波器的状态变量提供函数发生器从该输入数据确定量化器输出信号的输入数据。 后期状态变量在确定量化器输出信号时更为主导。 因此,较早的状态变量可以比后一种状态变量更大程度地近似,而量化精度没有显着的折中。