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公开(公告)号：US20140184194A1
公开(公告)日：2014-07-03
申请号：US13746313
申请日：2013-01-22
IPC分类号： G01R29/00
CPC分类号： G01R29/00 , G01R19/165 , G01R19/175 , G01R19/2503 , H03M1/127 , H03M1/365
摘要： Provided is a measurement apparatus that measures an input signal, comprising a plurality of first comparators that each receive the input signal, have a common first reference level set therein, and compare a signal level of the input signal to the first reference level; and a level-crossing timing detecting section that detects a level-crossing timing at which the signal level crosses the first reference level, based on comparison results of the first comparators.
摘要翻译： 提供了一种测量装置，其测量包括多个第一比较器的输入信号，每个第一比较器接收输入信号，其中设置有公共的第一参考电平，并将输入信号的信号电平与第一参考电平进行比较; 以及电平交叉定时检测部，其基于第一比较器的比较结果来检测信号电平跨越第一参考电平的电平交叉定时。
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公开(公告)号：US20140062751A1
公开(公告)日：2014-03-06
申请号：US13599539
申请日：2012-08-30
IPC分类号： H03M1/34
摘要： An apparatus is provided. A comparison circuit is configured to receive an analog signal. A reference circuit is coupled to the comparison circuit and is configured to provide a plurality of reference signals to the comparison circuit. A conversion circuit is coupled to the comparison circuit and is configured to detect a change in the output of the comparison circuit. A time-to-digital converter (TDC) is coupled to the comparison circuit. A timer is coupled to the comparison circuit. A rate control circuit is coupled to the conversion circuit. An output circuit is coupled to the rate control circuit and the TDC, where the output circuit is configured to output at least one of a synchronous digital representation of the analog signal and an asynchronous digital representation of the analog signal.
摘要翻译： 提供了一种装置。 比较电路被配置为接收模拟信号。 参考电路耦合到比较电路，并被配置为向比较电路提供多个参考信号。 A转换电路耦合到比较电路，并被配置为检测比较电路的输出的变化。 时间数字转换器（TDC）耦合到比较电路。 定时器耦合到比较电路。 速率控制电路耦合到转换电路。 输出电路耦合到速率控制电路和TDC，其中输出电路被配置为输出模拟信号的同步数字表示和模拟信号的异步数字表示中的至少一个。
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公开(公告)号：US08213554B2
公开(公告)日：2012-07-03
申请号：US12139079
申请日：2008-06-13
申请人： Thierry Blu , Martin Vetterli , Lionel Coulot
发明人： Thierry Blu , Martin Vetterli , Lionel Coulot
CPC分类号： H04L25/03006 , G06F17/10 , H03M1/0626 , H03M1/127 , H04B1/71637 , H04L27/2647
摘要： A method of signal processing, comprising: obtaining a digital signal (yn) based on another signal (xt) and noise; and estimating information relating to the another signal (xt) by using a denoising process to produce a denoised signal (y′n) and by processing the denoised signal (y′n), wherein the denoised signal (y′n) produced by the denoising process has a substantially Finite Rate of Innovation.
摘要翻译： 一种信号处理方法，包括：基于另一信号（xt）和噪声获得数字信号（yn）; 以及通过使用去噪处理来产生去噪信号（y'n）并且通过处理去噪信号（y'n）来估计与另一信号（xt）有关的信息，其中由所述噪声信号 去噪过程具有极大的有限创新率。
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公开(公告)号：US07876251B2
公开(公告)日：2011-01-25
申请号：US12574586
申请日：2009-10-06
申请人： Hongxuan Zhang
发明人： Hongxuan Zhang
IPC分类号： H03M1/12
CPC分类号： H03M1/127 , A61B5/0402 , G06F19/00 , H03M1/004 , H03M1/1215
摘要： A patient monitoring signal processing system adaptively varies medical signal data rate. The system uses an analog to digital converter for digitizing an analog cyclically varying input signal derived from a patient in response to a sampling clock input. The sampling clock determines frequency of analog to digital sampling of the analog input signal by the analog to digital converter. A detector detects first and second different signal portions within a cycle of the cyclically varying input signal. A control processor coupled to the analog to digital converter and the detector, provides the sampling clock and adaptively determines first and second different frequencies of the sampling clock to be used in sampling within detected corresponding first and second different signal portions of the cyclically varying input signal in response to predetermined information indicating a frequency of a signal component of the cyclically varying input signal in the first signal portion is higher than a frequency of a signal component of the cyclically varying input signal in the second signal portion. Also the first frequency is higher than the second frequency of the first and second different frequencies.
摘要翻译： 患者监护信号处理系统自适应地改变医疗信号数据速率。 系统使用模数转换器来响应于采样时钟输入数字化从患者得到的模拟周期性变化的输入信号。 采样时钟决定模数转换器模拟输入信号的模拟数字采样频率。 检测器在周期性变化的输入信号的周期内检测第一和第二不同的信号部分。 耦合到模数转换器和检测器的控制处理器提供采样时钟并且自适应地确定要在循环变化的输入信号的检测到的对应的第一和第二不同信号部分内的采样中使用的采样时钟的第一和第二不同频率 响应于指示第一信号部分中循环变化的输入信号的信号分量的频率的预定信息高于第二信号部分中循环变化的输入信号的信号分量的频率。 此外，第一频率高于第一和第二不同频率的第二频率。
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公开(公告)号：US20100008575A1
公开(公告)日：2010-01-14
申请号：US12172360
申请日：2008-07-14
申请人： Bing Ouyang , Amit Mittal , Troy Lane Ethridge
发明人： Bing Ouyang , Amit Mittal , Troy Lane Ethridge
摘要： A system and method for tuning a sampling frequency. A method comprises detecting a sampling frequency of an analog image signal, generating a set of histograms from samples of pixels from the analog image signal, using the set of histograms to determine whether the detected sampling frequency is substantially equal to a natural sampling frequency of the analog image signal, and sampling the analog image signal at the detected sampling frequency to produce image data. The samples are taken at the detected sampling frequency and at a different sampling phase for each of the histograms, and each histogram is for samples from a single image.
摘要翻译： 用于调谐采样频率的系统和方法。 一种方法包括检测模拟图像信号的采样频率，使用该组直方图从模拟图像信号的像素样本生成一组直方图，以确定所检测的采样频率是否基本上等于所述模拟图像信号的自然采样频率 模拟图像信号，并以检测到的采样频率对模拟图像信号进行采样以产生图像数据。 以检测的采样频率和每个直方图的不同采样阶段取样本，每个直方图是来自单个图像的采样。
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公开(公告)号：US07443947B2
公开(公告)日：2008-10-28
申请号：US10556918
申请日：2004-04-19
申请人： Carl J. Brunnett
发明人： Carl J. Brunnett
CPC分类号： H03M1/127 , A61B6/032 , G01T1/17 , G01T1/2985
摘要： In a method for measuring detected radiation, an analog data signal is converted to a digital data signal having aperiodic data pulses varying with intensity of the analog data signal. A time signal indicative of data intervals is produced. The data pulses are counted. A data count is stored in a start location and a corresponding time value is stored in a start location each time a data pulse occurs until a measured data interval starts. After a next data interval is detected, the data count is stored in an end location and a corresponding time value is stored in an end location when the next data pulse occurs. An average intensity of the detected radiation for the measured data interval is determined from the stored data counts and time values. A CT scanner (10) for measuring detected radiation includes a channel circuit (56), a storage circuit (60), a control circuit (58), and a processor (62).
摘要翻译： 在用于测量检测到的辐射的方法中，模拟数据信号被转换成具有以模拟数据信号的强度变化的非周期数据脉冲的数字数据信号。 产生指示数据间隔的时间信号。 对数据脉冲进行计数。 数据计数存储在开始位置，并且每当数据脉冲发生直到测量的数据间隔开始时，对应的时间值被存储在开始位置。 在检测到下一个数据间隔之后，当发生下一个数据脉冲时，数据计数被存储在结束位置中，并且相应的时间值被存储在结束位置。 根据存储的数据计数和时间值确定测量数据间隔的检测辐射的平均强度。 用于测量检测到的辐射的CT扫描器（10）包括通道电路（56），存储电路（60），控制电路（58）和处理器（62）。
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7.发明申请Method and apparatus for analog graphics sample clock frequency offset detection and verification 有权用于模拟图形采样时钟频偏检测和验证的方法和装置公开(公告)号：US20060274194A1
公开(公告)日：2006-12-07
申请号：US11355815
申请日：2006-02-16
CPC分类号： H03M1/127 , G09G5/008 , H04N5/14 , H04N7/0122
摘要： A method and apparatus for an analog-to-digital video signal converter. The converter is controlled by a clock with controllable frequency and phase for sampling an analog signal. A circuit corrects the clock frequency using a period of a columnar frame differences as a function of columnar location. The sampling clock frequency is changed by an amount dependent on the period of the columnar differences. A second measure of the difference between successive frames is computed for a sequence of clock phases. The frequency of the clock is verified using a characteristic of the second measure. The characteristic can be the ratio of the maximum to the minimum of the second measure over selected clock phases. Other characteristics can be used such as a difference of a maximum and a minimum measure.
摘要翻译： 一种用于模数 - 数字视频信号转换器的方法和装置。 转换器由具有可控频率和相位的时钟控制，用于对模拟信号进行采样。 电路使用柱状帧差的周期作为柱状位置的函数来校正时钟频率。 采样时钟频率的变化取决于柱状差的周期。 对于时钟相位序列计算连续帧之间的差的第二个度量。 使用第二个测量的特性来验证时钟的频率。 特性可以是所选时钟相位上的第二个测量的最大值与最小值的比值。 可以使用其他特征，例如最大和最小测量的差。
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公开(公告)号：US06987471B1
公开(公告)日：2006-01-17
申请号：US10923636
申请日：2004-08-20
申请人： Franklin M. Murden , James C. Camp
发明人： Franklin M. Murden , James C. Camp
IPC分类号： H03M1/06
摘要： Bias controllers are provided which alter a bias control signal so that a bias signal (e.g., a current signal) of an electronic network rapidly responds to increases in the rate-of-change of the network's analog input signal. This enhances the linearity of a system that includes the electronic network. Subsequent decreases in the rate-of-change are sensed and a decrease of the bias control signal is then paced at a rate selected to ignore short-term rate-of-change variations (e.g., modulation variations) but follow longer-term rate-of-change reductions to thereby enhance system efficiency without sacrificing system linearity.
摘要翻译： 提供偏置控制器，其改变偏置控制信号，使得电子网络的偏置信号（例如，电流信号）快速响应于网络的模拟输入信号的变化率的增加。 这增强了包括电子网络的系统的线性。 感测变化率的随后的降低，然后以选择为忽略短期变化率变化（例如，调制变化）但是遵循较长期速率 - 速率的速率来选择偏置控制信号的减小， 从而提高系统效率，而不牺牲系统线性度。
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公开(公告)号：US06621443B1
公开(公告)日：2003-09-16
申请号：US10262000
申请日：2002-10-01
申请人： Basilio Selli , Mário Missawa
发明人： Basilio Selli , Mário Missawa
IPC分类号： H03M178
摘要： A data acquisition method and system for obtaining digital samples are provided. A first digital sample related to an analog signal is obtained after a first time period. A second digital sample related to the analog signal is obtained after a second time period. The second digital sample is provided on at least one output if magnitudes of the first digital sample and the second digital sample differ from one another by a predetermined threshold.
摘要翻译： 提供了一种用于获取数字样本的数据采集方法和系统。 在第一时间段之后获得与模拟信号相关的第一数字样本。 在第二时间段之后获得与模拟信号相关的第二数字采样。 如果第一数字样本和第二数字样本的大小彼此相差预定阈值，则第二数字样本被提供在至少一个输出上。
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10.发明授权公开(公告)号：US06492929B1
公开(公告)日：2002-12-10
申请号：US09856312
申请日：2001-05-21
申请人： Adrian S Coffey , Martin Johnson , Robin Jones
发明人： Adrian S Coffey , Martin Johnson , Robin Jones
IPC分类号： H03M112
CPC分类号： H03M1/127
摘要： An analogue to digital converter generating at least two threshold levels and a comparator for comparing each of the levels with the input signal and generating a primary digital output signal to provide an indication that the input signal has crossed one of the threshold levels. The converter comprises a timer for determining the elapsed period of time between the input signal crossing a first level and the input signal crossing a second level and for generating a secondary output signal representing the elapsed time, whereby the secondary digital output signal and the corresponding primary output signal are used to provide a digital representation of the analogue input signal. The converter may also comprise a receiver of the primary digital output signal from the comparator and for providing an UP/DOWN digital output signal to indicate in which direction the input signal crossed the threshold level.
摘要翻译： 产生至少两个阈值电平的模数转换器和用于将每个电平与输入信号进行比较并产生主数字输出信号的比较器，以提供输入信号已经越过阈值电平之一的指示。 该转换器包括一个定时器，用于确定穿过第一电平的输入信号与穿过第二电平的输入信号之间经过的时间间隔，并产生表示经过时间的辅助输出信号，由此辅助数字输出信号和相应的主电路 输出信号用于提供模拟输入信号的数字表示。 转换器还可以包括来自比较器的主数字输出信号的接收器，并且用于提供UP / DOWN数字输出信号，以指示输入信号在哪个方向上越过阈值电平。
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