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公开(公告)号：US06738143B2
公开(公告)日：2004-05-18
申请号：US10010175
申请日：2001-11-13
Applicant: David C. Chu
Inventor： David C. Chu
IPC: G01B902
CPC classification number: G01B9/02059 , G01B9/02003 , G01B9/02083
Abstract: A system and method for non-linearity compensating interferometer position data includes receiving a plurality of groups of digital position values. A first group of the digital position values are digitally processed to generate a plurality of data values. The plurality of data values are digitally processed to generate at least one quasi-static non-linearity parameter. A second group of the digital position values are compensated based on the at least one non-linearity parameter.
Abstract translation: 用于非线性补偿干涉仪位置数据的系统和方法包括接收多组数字位置值。 数字位置值的第一组被数字处理以产生多个数据值。 多个数据值被数字处理以产生至少一个准静态非线性参数。 基于至少一个非线性参数来补偿第二组数字位置值。
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公开(公告)号：US5982831A
公开(公告)日：1999-11-09
申请号：US604273
申请日：1996-02-21
Applicant: David C. Chu
Inventor： David C. Chu
CPC classification number: H04J3/0688 , H04L7/0083
Abstract: A feed forward apparatus and method discipline a clock signal by a reference signal in digital telecommunication networks. A synthesizer correction term within the feed forward apparatus and method includes a frequency correction term so that when one frequency correction term is selected in place of another frequency correction term the phase of the clock signal remains free from extraneous frequency or phase variations during the transition between frequency correction terms. Alternatively, the synthesizer correction term includes a phase correction term so that phase coherence between the reference signal and the clock signal results.
Abstract translation: 前馈装置和方法通过数字电信网络中的参考信号来管理时钟信号。 前馈装置和方法中的合成器校正项包括频率校正项，使得当选择一个频率校正项代替另一个频率校正项时，时钟信号的相位在第二频率校正项之间的转换期间保持没有外来的频率或相位变化 频率校正项。 或者，合成器校正项包括相位校正项，使得参考信号和时钟信号之间的相位相干结果。
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公开(公告)号：US5631933A
公开(公告)日：1997-05-20
申请号：US604231
申请日：1996-02-21
Applicant: David C. Chu , Jeremy S. Sommer
Inventor： David C. Chu , Jeremy S. Sommer
CPC classification number: H04L1/22 , H03L7/07 , H04L7/0083
Abstract: A master and a slave digital frequency synthesizer are phase-locked such that the master synthesizer is always selected to minimize the phase hits which occur when switching the master to be a slave and vice versa. The switching rearrangement is done automatically and rapidly in the event of failure of the master frequency synthesizer.
Abstract translation: 主和从数字频率合成器是相位锁定的，从而总是选择主合成器以最小化将主机切换为从机时发生的相位命中，反之亦然。 在主频率合成器发生故障的情况下，开关重新排列自动快速完成。
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公开(公告)号：US5166959A
公开(公告)日：1992-11-24
申请号：US810946
申请日：1991-12-19
Applicant: David C. Chu , Thomas A. Knotts
Inventor： David C. Chu , Thomas A. Knotts
IPC: G04F10/04 , G01R29/027
CPC classification number: G01R29/0273
Abstract: A circuit for time stamping event signals, e.g. zero-crossings, using coarse and fine timers. The fine timer is a circuit section which subdivides a period from a phase-locked ring-oscillator into 2N subparts. An event signal is timed by latching a digital representation of a particular subpart. The digital representation of the subpart is an N-bit dual thermometer code which uniquely identifies each subpart with each adjacent subpart differing by only one bit. The subparts are made finer in time quantization than the propagation delay of one active element in the ring oscillator by the use of linear combiner elements. The dual thermometer code, encoded post-latching into a binary code, forms the "fine" timing part of a binary word representation of the event time. The event also latches the count states of a pair of lead-lag counters in a master-slave configuration counting ring oscillator periods. These counters change states respectively before and after the dual thermometer code turn-overs. Only one reading is chosen for recording as determined by the most significant bit of the fine code. The choice will always find an accurate and stable reading, and reject erroneous readings resulting from reading a counter in transition. The chosen counter reading, encoded to binary, forms the coarse timer for the binary word representation of the event time. The coarse and fine binary words are butt-joinable to form the complete binary timing representation without further arithmetic processing.
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5.发明授权公开(公告)号：US06792368B2
公开(公告)日：2004-09-14
申请号：US10052673
申请日：2002-01-17
Applicant: David C. Chu
Inventor： David C. Chu
IPC: G01C1738
CPC classification number: G01B9/02003 , G01B9/02002 , G01B9/02059 , G01B9/02083
Abstract: A system and method for compensating non-linearity of the high-velocity type manifested in heterodyne interferometer position data includes receiving a plurality of groups of digital position values. A plurality of groups of digital phase values from a measurement channel are received. A first group of the digital position values and digital phase values are digitally processed to generate a plurality of block data values. The plurality of block data values are digitally processed to generate at least one quasi-static non-linearity parameter. A second group of the digital position values are compensated based on the at least one quasi-static non-linearity parameter.
Abstract translation: 用于补偿表现在外差干涉仪位置数据中的高速度类型的非线性的系统和方法包括接收多组数字位置值。 接收来自测量通道的多组数字相位值。 数字位置值和数字相位值的第一组被数字处理以产生多个块数据值。 多个块数据值被数字处理以产生至少一个准静态非线性参数。 基于至少一个准静态非线性参数来补偿第二组数字位置值。
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Patent Agency Ranking
公开(公告)号：US06480126B1
公开(公告)日：2002-11-12
申请号：US10003798
申请日：2001-10-26
Applicant: David C. Chu
Inventor： David C. Chu
IPC: H03M148
CPC classification number: G01B9/02083 , G01B9/02003 , G01B2290/60 , G01B2290/70
Abstract: A system and method of digitizing characteristic parameters of a quasi-sinusoidal analog signal of unknown magnitude, frequency and phase-offset, includes digitizing the analog signal at a first sampling rate, thereby generating a plurality of sets of digital signal waveform samples. Successive sets of the digital signal waveform samples are digitally processed to generate continually updated digital characteristic parameters representing a characteristic behavior of the quasi-sinusoidal analog signal.
Abstract translation: 数字化未知幅度，频率和相位偏移的准正弦模拟信号的特征参数的系统和方法包括以第一采样率对模拟信号进行数字化，从而产生多组数字信号波形样本。 数字信号波形样本的连续集合被数字处理以产生表示准正弦模拟信号的特性行为的不断更新的数字特征参数。
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7.发明授权System for characterizing phase-modulated signals using a time interval analyzer 失效使用时间间隔分析仪表征相位调制信号的系统
公开(公告)号：US5519625A
公开(公告)日：1996-05-21
申请号：US197424
申请日：1994-02-16
Applicant: David C. Chu
Inventor： David C. Chu
CPC classification number: H04L1/206 , H04L27/2335
Abstract: A system for characterizing phase modulated signals, e.g., .pi./4 DQPSK signals, includes a time interval analyzer coupled to a system processor for determining a variety of signal characterizing parameters as a function of readings made on a phase modulated signal by the analyzer. The system processor includes a phase/frequency determining section for generating a phase deviation curve and decoding the modulated signal. The system processor further includes a processing section for determining various signal defining parameters including origin offset and I/Q mismatch as a function of the phase deviation.
Abstract translation: 用于表征相位调制信号（例如，pi / 4 DQPSK信号）的系统包括耦合到系统处理器的时间间隔分析器，用于根据分析仪在相位调制信号上作出的读数确定各种信号特征参数。 系统处理器包括相位/频率确定部分，用于产生相位偏差曲线并对调制信号进行解码。 系统处理器还包括处理部分，用于确定包括原点偏移和I / Q失配的各种信号定义参数作为相位偏差的函数。
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公开(公告)号：US5384541A
公开(公告)日：1995-01-24
申请号：US26933
申请日：1993-03-05
Applicant: David C. Chu , Alistair D. Black
Inventor： David C. Chu , Alistair D. Black
IPC: G01R31/319 , G01R31/3193 , G04F10/00 , G01S13/08
CPC classification number: G01R31/31937 , G04F10/00 , G01R31/3191
Abstract: A method and apparatus for the measuring of a delay in a delay circuit by making a continuous frequency measurement is proposed. The phase-locking of a variable frequency signal applied to the delay circuit allows the user to significantly improve the precision and accuracy of the time delay measurement. A scheme to extract the number of cycles stored in the delay circuit is also disclosed.
Abstract translation: 提出了通过进行连续频率测量来测量延迟电路中的延迟的方法和装置。 施加到延迟电路的可变频率信号的相位锁定允许用户显着提高时间延迟测量的精度和精度。 还公开了提取存储在延迟电路中的周期数的方案。
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公开(公告)号：US4519091A
公开(公告)日：1985-05-21
申请号：US519953
申请日：1983-08-03
Applicant: David C. Chu , Michael J. Ward
Inventor： David C. Chu , Michael J. Ward
CPC classification number: H03K21/12
Abstract: A method of sampling accurately the instantaneous content of a high speed counter without interrupting the counting process is provided. The method is applicable even when the higher order digits of the counter are constructed by slower switching circuits configured in either a synchronous or ripple-through arrangement. The switching and carry propagation times of these higher order counters need not be shorter than the time between successive events being counted. Sampling of the contents may be made repeatedly in the interim without affecting the totality of the final count.
Abstract translation: 提供了一种在不中断计数过程的情况下精确地采样高速计数器的瞬时内容的方法。 该方法即使当计数器的高阶数字由以同步或纹波布置配置的较慢开关电路构成时也是可应用的。 这些高阶计数器的切换和进位传播时间不需要短于连续事件计数之间的时间。 内容的抽样可以在临时重复进行，而不影响最终计数的总数。
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10.发明授权公开(公告)号：US09430996B2
公开(公告)日：2016-08-30
申请号：US13917551
申请日：2013-06-13
Applicant: David C. Chu
Inventor： David C. Chu
CPC classification number: G10H1/0008 , G10H2210/066 , G10H2210/395 , G10H2220/005
Abstract: System and method for identifying tones present in a short segment of digitized music stream, and for reporting simultaneously and quantitatively their respective magnitude and phase in near real time. Also captured are pitch deviations from the nominal tones of a predetermined music scale. The resulting spectral data can be scrolled manually from frame to frame to facilitate detail music evaluation and editing. The apparatus can also operate at real time to display notes being played, or to tone-activate audio-visual music enhancement and display with automatic synchronization.
Abstract translation: 用于识别存在于数字化音乐流的短段中的音调的系统和方法，以及用于近似实时地同时和定量地报告其相应的幅度和相位。 还捕获了与预定乐谱的标称音调的音调偏差。 所得到的光谱数据可以从帧到手动地滚动以便于细节音乐评估和编辑。 该装置还可以实时操作以显示正在播放的音符，或者通过自动同步来进行音调激活音视频音乐增强和显示。
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