公开(公告)号：US4164648A

公开(公告)日：1979-08-14

申请号：US918632

申请日：1978-06-23

Applicant: David C. Chu

Inventor： David C. Chu

IPC: G04F10/00 ,  G01R23/02

CPC classification number: G04F10/00

Abstract: Measurement of a time interval between a start and a stop event is made by activating a start oscillator in response to the start event and activating a stop oscillator in response to the stop event. The number of cycles of each respective oscillator signal which occur between the activation of each oscillator and the coincidence of the respective oscillator signal with that of an independent time base is determined. The number of cycles of the time base signal between the coincident points of it and the start and stop oscillator signal is also determined. These numbers, which are always integers, are used along with the values for the time base period and the difference in frequency between the time base oscillator and the start and stop oscillators to calculate the time interval. Resolution of the measurement is dependent on the frequency difference between the time base signal and the start and stop oscillator signals. Two triggered-phase oscillators, which are phase-locked to the reference oscillator, are used to supply the start and stop frequencies. The start trigger and stop signals are used for phase shifting, i.e., restarting of the oscillators rather than starting the oscillators. This allows for pre-trigger frequency control, and essentially eliminates post trigger frequency drift which usually occurs when an oscillator is first started. The coincidence signals are provided by the phase cross-over between the phase locked oscillator and the reference by a digital mixer.

Abstract translation: 通过响应于启动事件激活启动振荡器并响应于停止事件激活停止振荡器来进行开始和停止事件之间的时间间隔的测量。 确定在每个振荡器的激活与各个振荡器信号与独立时基的激活之间发生的每个振荡器信号的周期数。 同步点之间的时基信号与启动和停止振荡器信号的周期数也被确定。 这些数字总是整数，与时基周期的值和时基振荡器与起始和停止振荡器之间的频率差一起使用，以计算时间间隔。 测量的分辨率取决于时基信号与启动和停止振荡器信号之间的频率差。 两个触发相位振荡器被锁定到参考振荡器，用于提供起始和停止频率。 启动触发和停止信号用于相移，即振荡器的重新启动，而不是启动振荡器。 这允许预触发频率控制，并且基本上消除了当振荡器首次启动时通常发生的后触发频率漂移。 通过数字混频器在锁相振荡器和基准之间的相位交叉提供符合信号。

公开(公告)号：US20140372080A1

公开(公告)日：2014-12-18

申请号：US13917551

申请日：2013-06-13

Applicant: David C. Chu

Inventor： David C. Chu

IPC: G01H17/00

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。

公开(公告)号：US07436519B2

公开(公告)日：2008-10-14

申请号：US11142423

申请日：2005-06-01

Applicant: David C. Chu ,  Lee C. Kalem ,  William Clay Schluchter

Inventor： David C. Chu ,  Lee C. Kalem ,  William Clay Schluchter

IPC: G01B11/02

CPC classification number: G01B9/02059 ,  G01B9/02003 ,  G01B9/02083

Abstract: A method for non-linearity compensating interferometer position data generated from a measurement signal includes generating a first set of non-linearity parameters based on received digital position values. The method includes sensing whether a low velocity condition exists. A first one of the non-linearity parameters is updated based on an estimated magnitude of the measurement signal if the low velocity condition exists. At least one digital position value is compensated based on the updated non-linearity parameter if the low velocity condition exists.

Abstract translation: 从测量信号生成的用于非线性补偿干涉仪位置数据的方法包括基于接收的数字位置值生成第一组非线性参数。 该方法包括检测是否存在低速条件。 如果存在低速条件，则基于测量信号的估计幅度来更新非线性参数中的第一个。 如果存在低速条件，则基于更新的非线性参数来补偿至少一个数字位置值。

公开(公告)号：US5469466A

公开(公告)日：1995-11-21

申请号：US183466

申请日：1994-01-19

Applicant: David C. Chu

Inventor： David C. Chu

IPC: H04L7/02 ,  G01R23/10 ,  H04L1/20 ,  H04L7/033 ,  H04L7/027

CPC classification number: H04L1/205 ,  H04L7/0334

Abstract: A system for recovering parameters of an underlying clock signal from data modulated signals includes a time digitizer, or time stamping device, for sampling and locating edges of the data modulated signals, thereby selectively providing time stamp readings identifying incoming edges of the data signals. The time stamp readings are used, along with a user-input nominal clock frequency, to determine an array of actual clock cycle stamps, each representing an integral number of actual clock cycles occurring between adjacent time stamps. The array is then used in conjunction with the time stamps to characterize parameters of the underlying clock data. Once the clock parameters are recovered, a wide variety of information, for example, frequency and phase information, including jitter, can be determined with a very modest rate of sampling compared to the high data bandwidth. No phase locked loops are used and no physical clock is recovered. The system is operable over a well-defined range and is highly repeatable, independent of particular circuit design detail or parametric performance of circuit components.

Abstract translation: 用于从数据调制信号恢复基础时钟信号的参数的系统包括用于对数据调制信号的边缘进行采样和定位的时间数字化仪或时间戳装置，由此选择性地提供标识数据信号的进入边缘的时间戳读数。 使用时间戳读数以及用户输入的标称时钟频率来确定实际时钟周期标记的阵列，每个时钟周期标记表示在相邻时间戳之间发生的实际时钟周期的整数。 然后将该阵列与时间戳结合使用以表征底层时钟数据的参数。 一旦时钟参数被恢复，与高数据带宽相比，可以以非常适中的采样速率来确定各种各样的信息，例如包括抖动的频率和相位信息。 不使用锁相环，并且没有恢复物理时钟。 该系统可在明确定义的范围内工作，并且高度可重复，独立于电路组件的特定电路设计细节或参数性能。

公开(公告)号：US4613951A

公开(公告)日：1986-09-23

申请号：US659815

申请日：1984-10-11

Applicant: David C. Chu

Inventor： David C. Chu

IPC: G04F10/04 ,  G04F10/00 ,  H03K5/159

CPC classification number: G04F10/00

Abstract: A time interval measuring apparatus is provided for measuring the time interval between two signals. The two signals are successively brought to synchronization by delaying one of the two signals as they pass through a series of time shift cells connected in tandem. These delays are accumulated in a register, and the total net delay which is required to bring the two signals into synchronization is indicative of the time interval between the two signals. This indication of the time interval between the two signals thus forms the time interval measurement thereof. It can be refined by increasing the number of time shift cells in tandem and using progressively finer delays.

Abstract translation: 提供了用于测量两个信号之间的时间间隔的时间间隔测量装置。 当两个信号通过串联连接的一系列时移单元时，通过延迟两个信号中的一个信号，使这两个信号相继进入同步。 这些延迟累积在寄存器中，并且使两个信号同步所需的总净延迟指示两个信号之间的时间间隔。 因此，两个信号之间的时间间隔的这种指示形成其时间间隔测量。 可以通过逐步增加时移单元的数量并逐渐更细的延迟来改进。