CONVERSION OF A DISCRETE-TIME QUANTIZED SIGNAL INTO A CONTINUOUS-TIME, CONTINUOUSLY VARIABLE SIGNAL
    1.
    发明公开
    CONVERSION OF A DISCRETE-TIME QUANTIZED SIGNAL INTO A CONTINUOUS-TIME, CONTINUOUSLY VARIABLE SIGNAL 有权
    一个离散时间量化信号准时间连续连续变量信号转换

    公开(公告)号:EP2514098A1

    公开(公告)日:2012-10-24

    申请号:EP10798430.4

    申请日:2010-12-16

    申请人: Syntropy Systems

    IPC分类号: H03M3/04

    摘要: Provided are, among other things, systems, apparatuses, methods and techniques for converting a discrete-time quantized signal into a continuous-time, continuously variable signal. An exemplary converter preferably includes: (1) multiple oversampling converters, each processing a different frequency band, operated in parallel; (2) multirate (
    i.e. , polyphase) delta-sigma modulators (preferably second-order or higher); (3) multi-bit quantizers; (4) multi-bit-to-variable-level signal converters, such as resistor ladder networks or current source networks; (5) adaptive non-linear, bit-mapping to compensate for mismatches in the multi-bit-to-variable-level signal converters (
    e.g ., by mimicking such mismatches and then shifting the resulting noise to a frequently range where it will be filtered out by a corresponding bandpass (reconstruction) filter); (6) multi-band (
    e.g. , programmable noise-transfer-function response) bandpass delta-sigma modulators; and/or (7) a digital pre-distortion linearizer (DPL) for canceling noise and distortion introduced by an analog signal bandpass (reconstruction) filter bank.

    Apparatus comprising a sigma-delta modulator and method of generating a quantized signal in a sigma-delta modulator
    5.
    发明公开
    Apparatus comprising a sigma-delta modulator and method of generating a quantized signal in a sigma-delta modulator 有权
    装置与用于在Σ-Δ调制器产生的量化信号的sigma-delta调制器及方法

    公开(公告)号:EP1612946A1

    公开(公告)日:2006-01-04

    申请号:EP04388043.4

    申请日:2004-07-01

    IPC分类号: H03M3/02 H03L7/197

    摘要: A method of generating a quantized signal in a Sigma-Delta modulator (25) comprises the steps of feeding a modulator input signal to a quantizer (15) via at least one integrator (12, 13); generating in the quantizer (15) a quantized signal; feeding back the quantized signal to be subtracted from the modulator input signal; and generating a dither signal to be applied to a point in the Sigma-Delta modulator. The dither signal is applied to a selected one of a number of different points (11, 14) in the Sigma-Delta modulator (25) in dependence of a control signal. In this way a method of generating a quantized signal in a Sigma-Delta modulator is provided which provides optimal results for different modes of the application, such as phase modulation mode and frequency modulation mode in a Bluetooth receiver.

    摘要翻译: 在Σ-Δ调制器(25)产生的量化信号的方法包括:经由至少一个积分器(12,13)供给的调制器的输入信号到一个量化器(15)的步骤; 生成在量化器(15)的量化信号; 反馈量化信号是从调制器输入信号中减去; 和用于生成一个颤动信号被施加到在sigma-delta调制的点。 抖动信号被施加到数在一个控制信号的依赖性的Σ-Δ调制器(25)的不同点(11,14)的所选择的一个。 以这种方式提供了一种产生在Σ-Δ调制器的量化信号的方法,其提供用于应用程序的不同的模式,颜色最佳的结果:如在蓝牙接收机相位调制模式和频率调制模式。

    MODULATION DIGITAL-ANALOG CONVERTER, DIGITAL SIGNAL PROCESSING METHOD, AND AV DEVICE
    6.
    发明公开
    MODULATION DIGITAL-ANALOG CONVERTER, DIGITAL SIGNAL PROCESSING METHOD, AND AV DEVICE 有权
    调制数字 - 模拟 - 氨基甲酸酯,数字信号转换器AV-EINRICHTUNG

    公开(公告)号:EP2117117A1

    公开(公告)日:2009-11-11

    申请号:EP07860383.4

    申请日:2007-12-27

    IPC分类号: H03F3/217 H03F1/32

    摘要: A ΔΣ modulation digital-analogue converter of the present invention includes: a look-up table in which a correspondence relationship between each of a plurality of possible input values of an input signal externally supplied, and each of compensation values individually associated with the possible input values, are stored; and a nonlinear compensation circuit (6) for compensating the input signal externally supplied, based on a compensation value associated with the input signal among the compensation values, and supplying a ΔΣ modulation section (1) the input signal thus compensated. A sine wave is used as the input signal. The compensation value is set based on magnitudes of a spectrum of odd-order harmonics whose frequencies are A times more than a frequency of the sine wave (A is an odd number), the spectrum obtained in such a manner that an output of a D-Class amplifier (2) or an output of the ΔΣ modulation digital-analogue converter is subjected to a frequency analysis without a compensation with respect to the sine wave by the nonlinear compensation circuit (6). Therefore, it is possible to provide a ΔΣ modulation digital-analogue converter which (i) suppresses generation of odd-order harmonics with a simple circuit arrangement, and therefore (ii) is excellent in SNR and THD+N.

    摘要翻译: 本发明的“£调制数字 - 模拟转换器”包括:查找表,其中外部提供的输入信号的多个可能输入值中的每一个与每个可能的与可能的输入信号相关联的每个补偿值之间的对应关系 输入值,存储; 以及用于根据与所述补偿值之间的输入信号相关联的补偿值来补偿外部提供的输入信号的非线性补偿电路(6),并且将所述补偿的输入信号提供给“£调制部分(1)”。 使用正弦波作为输入信号。 补偿值基于频率为正弦波的频率(A为奇数)的A倍的奇次高次谐波的幅度的大小设定,以D的输出方式得到的频谱 经非线性补偿电路(6),对于正弦波,对于“£调制数模转换器”的类放大器(2)或输出进行频率分析而无需相对于正弦波的补偿。 因此,可以提供一种“£调制数字模拟转换器,其(i)以简单的电路装置抑制奇次谐波的产生,因此(ii)SNR和THD + N优异。

    NOISE SHAPING CIRCUITS AND METHODS WITH FEEDBACK STEERING OVERLOAD COMPENSATION AND SYSTEMS USING THE SAME
    7.
    发明公开
    NOISE SHAPING CIRCUITS AND METHODS WITH FEEDBACK STEERING OVERLOAD COMPENSATION AND SYSTEMS USING THE SAME 有权
    RAUSCHFORMUNGSSCHALTUNGEN UND VERFAHREN MIT R CKKPLPLUNGSLENK BERLASTKOMPENSATION UND SYSTEME DAMIT

    公开(公告)号:EP1540827A4

    公开(公告)日:2005-08-24

    申请号:EP03799250

    申请日:2003-08-01

    申请人: CIRRUS LOGIC INC

    摘要: A noise shaper includes a first feedback loop for noise shaping a first feedback signal under normal operating conditions and having a first filter (201) with a first signal transfer function and a second feedback loop that is stable under overload conditions and has a second filter (202) having a second signal transfer function differing from the first signal transfer function. The noise shaper also includes an output circuit block including a quantizer (203) and steering circuitry (204). The quantizer (203) includes an input simultaneously responsive to outputs of the first (201) and second filters (202). The steering circuitry (204) steers a feedback from an output of the quantizer (203) to input of the first and second feedback loops. The steering circuitry (204) steers feedback from output of the quantizer (203) to inputs of the first and second feedback loops, the steering circuitry (204) including a first output for providing the first feedback signal to the first feedback loop and a second output for providing a second feedback signal to the second feedback loop.

    摘要翻译: 噪声整形器包括用于在正常工作条件下对第一反馈信号进行噪声整形的第一反馈回路,并具有带有第一信号传递函数的第一滤波器(201)和在过载条件下稳定的第二反馈回路,并具有第二滤波器( 202)具有不同于第一信号传递函数的第二信号传递函数。 噪声整形器还包括包括量化器(203)和导向电路(204)的输出电路块。 量化器(203)包括同时响应于第一(201)和第二滤波器(202)的输出的输入。 操纵电路(204)将来自量化器(203)的输出的反馈引导至第一和第二反馈回路的输入。 操纵电路(204)将来自量化器(203)的输出的反馈引导至第一反馈回路和第二反馈回路的输入,操纵电路(204)包括用于向第一反馈回路提供第一反馈信号的第一输出, 输出用于向第二反馈回路提供第二反馈信号。

    Delta-sigma modulator, method of switching delta-sigma modulator, and digital amplifier
    8.
    发明公开
    Delta-sigma modulator, method of switching delta-sigma modulator, and digital amplifier 有权
    Delta-Sigma调制器,Verfahren zur Schaltung eines Delta-Sigma Modulators,undDigitalverstärker

    公开(公告)号:EP1424780A2

    公开(公告)日:2004-06-02

    申请号:EP03257351.1

    申请日:2003-11-21

    IPC分类号: H03M7/36

    摘要: A delta-sigma modulator includes a quantization bit rate detection unit that detects a quantization bit rate of a digital audio signal, a volume setting value detection unit that detects a volume setting value of the digital audio signal; a filter that includes plural sets of filter coefficients having different shaping properties and allows the quantization noise to pass, and a filter coefficient switcher that switches the filter coefficients of the filter in accordance with the detection results of the quantization bit rate detection unit and the volume setting value detection unit. The delta-sigma modulator detects the quantization bit rate of an input signal and switches the filter coefficients to the low-order filter coefficient set when a source has a low quantization bit rate.

    摘要翻译: Δ-Σ调制器包括检测数字音频信号的量化比特率的量化比特率检测单元,检测数字音频信号的音量设定值的音量设定值检测单元; 滤波器,其包括具有不同成形特性的多组滤波器系数并允许量化噪声通过;以及滤波器系数切换器,其根据量化比特率检测单元和体积的检测结果来切换滤波器的滤波器系数 设定值检测单元。 Δ-Σ调制器检测输入信号的量化比特率,并且当源具有低量化比特率时,将滤波器系数切换到低阶滤波器系数集合。

    Modulateur sigma-delta numérique-numérique et synthetiseur de fréquence numérique l'incorporant
    10.
    发明公开
    Modulateur sigma-delta numérique-numérique et synthetiseur de fréquence numérique l'incorporant 有权
    数字Sigma-Delta调制器和数字频率合成器

    公开(公告)号:EP1367723A1

    公开(公告)日:2003-12-03

    申请号:EP03291288.3

    申请日:2003-05-28

    IPC分类号: H03M7/00

    CPC分类号: H03M7/3033 H03M7/3022

    摘要: Un modulateur Sigma-Delta numérique-numérique (1) comprend une entrée (10) pour recevoir une valeur numérique d'entrée (X) codée sur N bits, où N est un nombre entier déterminé, une sortie (20) pour délivrer une valeur numérique de sortie (Y) codée sur n bits, où n est un nombre entier déterminé inférieur à N, et au moins une première cellule Sigma-Delta (100) qui inclut un quantificateur (Q1) ayant un échelon de quantification (q) qui est un nombre premier. Le choix d'un nombre premier diminue la puissance des cycles limites (raies de puissance plus élevée que la moyenne locale) pouvant apparaître en fonction du code d'entrée du modulateur et des conditions initiales.
    Application à un synthétiseur de fréquence numérique.

    摘要翻译: 数字Σ-Δ调制器包括:输入端(10),用于接收以N位编码的输入数字值(X),其中N为确定的整数;输出(20),用于输出编码的输出数字值 在n位上,其中n是小于N的确定的整数,以及包括减法器(S1),积分器(11)和量化器(Q1)的至少一个第一级的Σ-Δ单元(100) 作为素数的量化步长(q1)。 素数的选择降低了极限周期的功率,即电力线高于局部平均值,这可以作为输入代码和初始条件的函数出现。 调制器可以包括多于一个的单元,即除了信号增量单元之外的P-1,其中P是大于或等于2的整数,其中P单元根据MASH结构布置,并且量化步长 每个单元格等于素数。 P-1其他单元具有与第一单元(100)相同的结构。 P细胞是第一顺序的。 数字频率合成器(要求保护)包括在反馈路径中具有可变分频器的锁相环(PLL),以及用于编码用于控制分频比的信号的数字Σ-Δ调制器(要求保护的)。