公开(公告)号：US20230384582A1

公开(公告)日：2023-11-30

申请号：US17827413

申请日：2022-05-27

申请人： Microsoft Technology Licensing, LLC

发明人： Wenjun LIAO ,  Algird Michael GUDAITIS ,  Ruipeng SUN

IPC分类号： G02B26/08 ,  H03H21/00 ,  B81B7/00

CPC分类号： G02B26/0833 ,  H03H21/0021 ,  B81B7/008 ,  B81B2201/042

摘要： The configuring of a micromirror to suppress a resonance of the micromirror. As part of the configuring process, the micromirror is subjected to multiple actuation frequencies, and the micromirror response is measured in response to at least some of these actuation frequencies. A resonant frequency of the micromirror is then determined using at least some of the measured mechanical responses. Then, depending on this determined resonant frequency of the micromirror, notch filter parameters are selected. There is more than one possibility for notch filter parameters, where the selected possibility depends on the determined resonant frequency. The notch filter is then configured with the selected notch filter parameters.

公开(公告)号：US20130272447A1

公开(公告)日：2013-10-17

申请号：US13910779

申请日：2013-06-05

申请人： Applied Micro Circuits Corporation

发明人： Dariush DABIRI ,  Maged F. BARSOUM

IPC分类号： H03H21/00

CPC分类号： H03H21/0021 ,  H03H21/0012

摘要： A circuit and method perform adaptive spectral enhancement at a frequency ω1 (also called “fundamental” frequency) on an input signal y which includes electromagnetic interference (EMI) at an unknown frequency, to generate a fundamental-enhanced signal φ1 (or its complement). The fundamental-enhanced signal φ1 (or complement) is thereafter used in a notching circuit (also called “fundamental notching” circuit) to generate a fundamental-notched signal y-φ1. The fundamental-notched signal y-φ1 is itself enhanced to generate a harmonic-enhanced signal φ2 that is used to notch the fundamental-notched signal y-φ1 again, in one or more additional notching circuits that are connected in series with the fundamental notching circuit. The result (“cascaded-harmonic-notched” signal) is relatively free of EMI noise (fundamental and harmonics), and is used as an error signal for an adaptation circuit that in turn identifies the fundamental frequency ω1. Use of a cascaded-harmonic-notched signal as the error signal improves speed of convergence of adaptation.

摘要翻译： 电路和方法在包括未知频率的电磁干扰（EMI）的输入信号y上以频率ω1（也称为“基本”频率）执行自适应频谱增强，以产生基本增强信号phi1（或其补码） 。 此后，在开槽电路（也称为“基本陷波”电路）中使用基本增强信号phi1（或补码）以产生基本缺陷信号y-phi1。 基本缺陷信号y-phi1本身被增强以产生用于在与基本开槽串联连接的一个或多个额外的开槽电路中再次陷波基波切割信号y-phi1的谐波增强信号phi2 电路。 结果（“级联谐波陷波”信号）相对没有EMI噪声（基波和谐波），并被用作自适应电路的误差信号，自适应电路又识别基频ω1。 使用级联谐波陷波信号作为误差信号提高适应性收敛速度。

公开(公告)号：US20130072143A1

公开(公告)日：2013-03-21

申请号：US13674643

申请日：2012-11-12

申请人： Dariush Dabiri

发明人： Dariush Dabiri

IPC分类号： H04B1/10

CPC分类号： H03H21/0021 ,  H03H21/0012

摘要： A narrowband interference (NBI) canceller is coupled to an A/D converter to receive an input signal and supply an NBI-canceled signal to an error correcting decoder. In the NBI canceller, a first arithmetic unit receives the input signal and a predicted- interference signal, and supplies a difference thereof as the interference-canceled signal. A slicer receives the interference-canceled signal and supplies a decision signal. A second arithmetic unit subtracts the decision signal from the input signal to generate a noise signal. A coarse frequency estimator receives the noise signal and analyzes the frequency spectrum to generate a coarse estimate of a fundamental frequency of the NBI. The coarse estimate is used by an adaptive narrowband interference predictor to generate the predicted-interference signal while adaptively tracking the narrowband interference. Use of the NBI canceller in a transceiver can eliminate link drop caused by operation of wireless devices that generate EMI in a cable.

摘要翻译： 窄带干扰（NBI）消除器耦合到A / D转换器以接收输入信号，并向纠错解码器提供NBI消除的信号。 在NBI消除器中，第一算术单元接收输入信号和预测干扰信号，并将其差作为干扰消除信号。 切片器接收干扰消除信号并提供判决信号。 第二算术单元从输入信号中减去判定信号以产生噪声信号。 粗略频率估计器接收噪声信号并分析频谱以产生NBI的基频的粗略估计。 自适应窄带干扰预测器使用粗略估计来产生预测干扰信号，同时自适应地跟踪窄带干扰。 在收发器中使用NBI消除器可以消除在电缆中产生EMI的无线设备的操作造成的链路丢失。

公开(公告)号：US08331508B2

公开(公告)日：2012-12-11

申请号：US12952150

申请日：2010-11-22

申请人： Dariush Dabiri

发明人： Dariush Dabiri

IPC分类号： H03D1/04

CPC分类号： H03H21/0021 ,  H03H21/0012

摘要： A narrowband interference (NBI) canceller is coupled to an A/D converter to receive an input signal and supply an NBI-canceled signal to an error correcting decoder. In the NBI canceller, a first arithmetic unit receives the input signal and a predicted-interference signal, and supplies a difference thereof as the interference-canceled signal. A slicer receives the interference-canceled signal and supplies a decision signal. A second arithmetic unit subtracts the decision signal from the input signal to generate a noise signal. A coarse frequency estimator receives the noise signal and analyzes the frequency spectrum to generate a coarse estimate of a fundamental frequency of the NBI. The coarse estimate is used by an adaptive narrowband interference predictor to generate the predicted-interference signal while adaptively tracking the narrowband interference. Use of the NBI canceller in a transceiver can eliminate link drop caused by operation of wireless devices that generate EMI in a cable.

摘要翻译： 窄带干扰（NBI）消除器耦合到A / D转换器以接收输入信号，并向纠错解码器提供NBI消除的信号。 在NBI消除器中，第一算术单元接收输入信号和预测干扰信号，并将其差作为干扰消除信号。 切片器接收干扰消除信号并提供判决信号。 第二算术单元从输入信号中减去判定信号以产生噪声信号。 粗略频率估计器接收噪声信号并分析频谱以产生NBI的基频的粗略估计。 自适应窄带干扰预测器使用粗略估计来产生预测干扰信号，同时自适应地跟踪窄带干扰。 在收发器中使用NBI消除器可以消除在电缆中产生EMI的无线设备的操作造成的链路丢失。

公开(公告)号：US20110305306A1

公开(公告)日：2011-12-15

申请号：US12933416

申请日：2010-08-03

申请人： Gang Hu ,  Yuanfei Nie ,  Meiwu Wu

发明人： Gang Hu ,  Yuanfei Nie ,  Meiwu Wu

IPC分类号： H04B1/10

CPC分类号： H03H21/0021 ,  H03H2021/0094

摘要： The present invention relates to a blind adaptive filter for narrowband interference cancellation, which includes an adaptive filter, a delay unit coupled to the adaptive filter for generating a delayed signal with a predetermined delay length from the output signal of the adaptive filter, and an error calculation unit coupled to the adaptive filter and the delay unit. The error calculation unit compares the output signal from the adaptive filter and the delayed signal from the delay unit to extract error information, and feedback the first error information to the adaptive filter. The first error information is formed of a transfer function including a number of coefficients, and used to adjust the adaptive filter and remove interference in the next input signal. The disclosed technique is also applicable in wideband receivers, as well as resisting multiple strong narrowband interferences having a frequency sweep rate of tens of milliseconds.

摘要翻译： 本发明涉及一种用于窄带干扰消除的盲自适应滤波器，其包括自适应滤波器，耦合到自适应滤波器的延迟单元，用于从自适应滤波器的输出信号产生具有预定延迟长度的延迟信号，以及误差 计算单元耦合到自适应滤波器和延迟单元。 误差计算单元将来自自适应滤波器的输出信号和来自延迟单元的延迟信号进行比较以提取错误信息，并将第一误差信息反馈给自适应滤波器。 第一误差信息由包括多个系数的传递函数形成，并用于调整自适应滤波器并消除下一个输入信号中的干扰。 所公开的技术也可应用于宽带接收机，以及抵抗具有几十毫秒的频率扫描速率的多个强窄带干扰。

公开(公告)号：US06867642B1

公开(公告)日：2005-03-15

申请号：US10649980

申请日：2003-08-25

申请人： Benigno Maqueira

发明人： Benigno Maqueira

IPC分类号： H03H21/00 ,  H03K5/00

CPC分类号： H03H21/0001 ,  H03H21/0021

摘要： A notch compensation apparatus and method comprising, based on input to and output from a notch filter, dynamically calculating a desired change to a notch frequency of the notch filter and specifying the desired change to the notch filter so as to cancel an input resonance of uncertain or time varying frequency.

摘要翻译： 一种陷波补偿装置和方法，包括：基于对陷波滤波器的输入和输出，动态地计算所述陷波滤波器的陷波频率的期望变化，并指定所述陷波滤波器的所需变化，以消除不确定的输入谐振 或时变频率。

公开(公告)号：US20240213960A1

公开(公告)日：2024-06-27

申请号：US18393143

申请日：2023-12-21

申请人： u-blox AG

发明人： Nikolaos Katsaros ,  Olivier Julien ,  Giorgos Tzimas ,  Evangelos Stefatos

IPC分类号： H03H21/00 ,  H03H17/02

CPC分类号： H03H21/0021 ,  H03H17/02 ,  H03H2017/0081

摘要： In one embodiment an adaptive filter structure comprises a detector circuit (10) configured to receive an input signal (Sin), to detect a presence of a sweeping interference in the input signal, and upon detection of such sweeping interference to provide a first trigger signal (T1) to a delay circuit (20), wherein the first trigger signal (T1) comprises a first frequency indication (f1); the delay circuit (20) is configured, upon receiving the first trigger signal (T1), to provide a second trigger signal (T2) to a tracker circuit (30) after an adjustable amount of time; the tracker circuit (30) is configured, upon receiving the second trigger signal (T2), to estimate a frequency of the sweeping interference using a second frequency indication (f2), to track the estimated frequency and provide the estimated frequency as a third frequency indication (13) to a notch filter circuit (40); and the notch filter circuit (40) is configured to substantially eliminate the sweeping interference from the input signal (Sin) using the third frequency indication (f3) and therefrom provide an output signal (Sout).

公开(公告)号：US20140028368A1

公开(公告)日：2014-01-30

申请号：US13951976

申请日：2013-07-26

申请人： RF Micro Devices, Inc.

发明人： Nadim Khlat

IPC分类号： H03H21/00

CPC分类号： H03H21/0021 ,  H03F1/0227 ,  H03F3/195 ,  H03F3/245 ,  H03F2200/432 ,  H03F2200/555 ,  H03H7/0107 ,  H03H7/0153 ,  H03H2007/013

摘要： A parallel amplifier, a switching supply, and a radio frequency (RF) notch filter are disclosed. The parallel amplifier has a parallel amplifier output, such that the switching supply is coupled to the parallel amplifier output. Further, the RF notch filter is coupled between the parallel amplifier output and a ground. The RF notch filter has a selectable notch frequency, which is based on an RF duplex frequency.

摘要翻译： 公开了一种并行放大器，开关电源和射频（RF）陷波滤波器。 并联放大器具有并联放大器输出，使得开关电源耦合到并行放大器输出。 此外，RF陷波滤波器耦合在并行放大器输出和地之间。 RF陷波滤波器具有可选择的陷波频率，其基于RF双工频率。

公开(公告)号：US08634507B2

公开(公告)日：2014-01-21

申请号：US13334484

申请日：2011-12-22

申请人： Robert Fifield

发明人： Robert Fifield

IPC分类号： H04B1/10

CPC分类号： H04B1/123 ,  H03H21/0021 ,  H03H21/0027 ,  H03H21/0043 ,  H04B1/0003 ,  H04B1/0032 ,  H04B1/0035 ,  H04B1/0039 ,  H04B1/30 ,  H04B1/7136 ,  H04B2001/71367

摘要： A receiver comprises an adaptive filter having an input for a digitized input signal, means for storing a pre-designed filter characteristic, means for analyzing a digital. representation of the input signal to determine a desired position of the filter characteristic to match the system requirements, and means for adapting the stored pre-designed filter characteristic in the frequency domain and/or the time domain to match the system requirements and for transforming the adapted filter characteristic to the time domain to update coefficients for the adaptive filter and for loading updated coefficients into adaptive filter. The updating of the coefficients may be done periodically. The adaptation may be one or more of adjusting bandwidth, frequency shift and, in the case of a bandpass characteristic, superimposing characteristics.

摘要翻译： 接收机包括具有用于数字化输入信号的输入的自适应滤波器，用于存储预设滤波特性的装置，用于分析数字的装置。 输入信号的表示以确定滤波器特性以满足系统要求的期望位置，以及用于在频域和/或时域中调整存储的预先设计的滤波器特性以匹配系统要求并用于变换 适应滤波器特性到时域以更新自适应滤波器的系数并将更新的系数加载到自适应滤波器中。 系数的更新可以周期性地进行。 适应可以是调整带宽，频移以及在带通特性的情况下的叠加特性中的一个或多个。

公开(公告)号：US08392000B2

公开(公告)日：2013-03-05

申请号：US12795273

申请日：2010-06-07

申请人： Jason Levin ,  Petros Ioannou

发明人： Jason Levin ,  Petros Ioannou

IPC分类号： G06F19/00

CPC分类号： G05B19/41835 ,  G05B2219/41217 ,  G05B2219/41232 ,  H03H21/0021

摘要： The control of flexible systems is often difficult due to the exact frequencies of the elastic modes being hard to identify. These flexible modes may change over time, or vary between units of the same system. The variation in the modal dynamics may cause a degradation in performance or even instabilities unless compensated for by the control scheme. Controllers designed for these types of systems use notch filters for mode suppression. However variation in the parameters of the flexible modes may cause the need for wide notch filters. An adaptive scheme is proposed which uses an online estimator based on plant parameterization. The scheme may not use probe signals and may not rely on exact parameter identification of the unknown parameters. Instead it may continuously update itself to cancel the effect of the flexible modes by been able to identify the effect of the modal dynamics on the performance of the system. The adaptive notch filter can be designed narrower, adding less phase lag at lower frequencies, thereby allowing an increase in bandwidth and disturbance rejection capability. Simulation and experimental verification of the adaptive mode suppression scheme is given through the use of a laser beam pointing system. The adaptive scheme is compared to a non-adaptive scheme, and is able to decrease the standard deviation of the experimentally measured tracking error by 14% even when the flexible dynamics are unknown.

摘要翻译： 灵活系统的控制通常是困难的，因为弹性模式的确切频率难以识别。 这些灵活的模式可能随着时间的推移而变化，或者在相同系统的单元之间变化。 模态动力学的变化可能导致性能下降甚至不稳定，除非由控制方案补偿。 为这些类型的系统设计的控制器使用陷波滤波器进行模式抑制。 然而，灵活模式的参数的变化可能导致需要宽的陷波滤波器。 提出了一种使用基于工厂参数化的在线估计器的自适应方案。 该方案可能不使用探测信号，也可能不依赖于未知参数的精确参数识别。 相反，它可以通过能够识别模态动力学对系统性能的影响而不断更新自己以消除灵活模式的影响。 自适应陷波滤波器可以设计得更窄，在较低频率下增加较少的相位滞后，从而允许增加带宽和抗干扰能力。 通过使用激光束指向系统给出了自适应模式抑制方案的仿真和实验验证。 将自适应方案与非自适应方案进行比较，即使灵活动态未知，也能将实验测量的跟踪误差的标准偏差降低14％。