公开(公告)号：US4023563A

公开(公告)日：1977-05-17

申请号：US615305

申请日：1975-09-22

申请人： Charles A. Reynolds ,  Richard A. Mentelos ,  Donald E. Lewis

发明人： Charles A. Reynolds ,  Richard A. Mentelos ,  Donald E. Lewis

IPC分类号： A61B5/02 ,  A61B5/0285 ,  G01R29/02 ,  H03K5/153

CPC分类号： A61B5/0285 ,  H03K5/153

摘要： Apparatus and a method for determining the onset of an interarterial blood pressure pulse and measuring the time delay preceding the onset from the corresponding electrical heartbeart triggering signal wherein the blood pressure pulse is converted to an electrical input signal which is split into two identical components, one being delayed in time, inverted and amplified after which it is added to the other. A timer measures the duration between the electrical heartbeat actuating signal and the point at which the sum of the blood pressure component signals reaches a peak and subtracts from that result the time delay applied to the one component to yield the electromechanical interval between the electrical heartbeat signal and onset of the blood pressure pulse.

摘要翻译： 用于确定动脉内血压脉冲开始并测量从相应的电心跳触发信号开始之前的时间延迟的装置和方法，其中血压脉冲被转换为被分成两个相同组件的电输入信号，一个 延迟时间，反转和放大，之后添加到另一个。 定时器测量电心跳启动信号与血压分量信号之和达到峰值的点之间的持续时间，并从该结果中减去施加到一个组件的时间延迟以产生电心跳信号之间的机电间隔 并开始血压脉冲。

公开(公告)号：US4556222A

公开(公告)日：1985-12-03

申请号：US666014

申请日：1984-10-29

申请人： Donald E. Lewis ,  Delmar D. Lewis

发明人： Donald E. Lewis ,  Delmar D. Lewis

IPC分类号： F16J15/00 ,  F16J15/06

CPC分类号： F16J15/008

摘要： A typical fluid mixer of the heavy-duty type conventionally has a compartment including walls, one of which has a circular opening through which a motor-driven shaft extends. An external seal is provided for sealing the shaft-to-wall junction against fluid leakage. When it becomes necessary to replace the seal, the compartment must be drained to avoid leakage at the opening. The present invention provides an internal seal that is normally spaced along the shaft away from the wall but which can be forcibly moved toward and compressed against the wall and thus seal the shaft and opening and preventing leakage during repairs and consequently eliminating emptying the tank. The interior seal is supported by a movable carrier, and reversible force-exerting mechanism extending exteriorly of the compartment is employed to move the carrier and interior seal into and out of its interior sealing position. In a preferred embodiment, the force-exerting mechanism includes one or more jack screws.

摘要翻译： 重型的典型的流体混合器通常具有包括壁的隔室，其中一个具有电动轴延伸通过的圆形开口。 提供外部密封件以密封轴对壁结，防止流体泄漏。 当需要更换密封件时，必须排空隔室以避免在开口处泄漏。 本发明提供了一种内部密封件，其通常沿轴远离壁而间隔开，但是其可以被强制地移向并压靠在壁上并因此密封轴和打开，并且防止在维修期间的泄漏并因此消除了排空罐。 内部密封件由可移动的载体支撑，并且使用在隔室外部延伸的可逆力施加机构将载体和内部密封件移入和移出其内部密封位置。 在优选实施例中，施力机构包括一个或多个千斤顶螺钉。

公开(公告)号：US4377824A

公开(公告)日：1983-03-22

申请号：US251696

申请日：1981-04-07

申请人： Gilbert G. Kuperman ,  Donald E. Lewis

发明人： Gilbert G. Kuperman ,  Donald E. Lewis

IPC分类号： G11B27/024 ,  H04N5/919 ,  H04N5/785

CPC分类号： H04N5/919 ,  G11B27/024

摘要： An apparatus and method for recording and reproducing extended periods of video information on a longitudinal tape recorder without losing synchronism or image quality. The composite video signal, and synchronization signals extracted therefrom, are recorded in spatial registry on separate channels of a longitudinal tape recorder/reproducer. Vertical synchronization quality is maintained by recording on a channel capable of low frequency processing. Upon reproduction all synchronization, including mixing with supplemental video sources, is synchronized to the recorded master video synchronization and blanking signals. Video display at other than normal speeds is temporally synchronized from the slower tape speed. An X-Y monitor driven by vertical and horizontal sweep signals synchronized to the corresponding recorded synchronization signals generates a video presentation without repeated or omitted frames.

摘要翻译： 一种用于在纵向磁带录像机上记录和再现长时间的视频信息而不失去同步或图像质量的装置和方法。 复合视频信号和从其中提取的同步信号被记录在纵向磁带记录器/再现器的单独通道上的空间注册表中。 通过在能够进行低频处理的通道上进行记录来维持垂直同步质量。 在再现时，包括与补充视频源的混合的所有同步与记录的主视频同步和消隐信号同步。 在正常速度以外的视频显示与较慢的磁带速度暂时同步。 由垂直和水平扫描信号驱动的与对应的记录同步信号同步的X-Y监视器产生视频呈现而不重复或省略帧。

公开(公告)号：US08497790B1

公开(公告)日：2013-07-30

申请号：US13424671

申请日：2012-03-20

申请人： Donald E. Lewis ,  Ryan James Kier ,  Paul Talmage Watkins ,  Rex K. Hales ,  Yusuf Haque

发明人： Donald E. Lewis ,  Ryan James Kier ,  Paul Talmage Watkins ,  Rex K. Hales ,  Yusuf Haque

IPC分类号： H03M1/10

CPC分类号： H03M1/1019 ,  H03M1/0639 ,  H03M1/1215 ,  H03M1/1225 ,  H03M1/164

摘要： A pipelined Analog-to-Digital Converter (ADC) includes circuitry to characterize capacitors associated with a Multiplying-Digital-to-Analog Converter (MDAC) of a stage of said pipelined ADC, said capacitors contributing to a gain of said pipelined ADC, circuitry to connect a subset of said capacitors not currently being characterized to reference signals of said pipelined ADC such that a residue signal of said stage stays within an input range of an instrument measuring said residue signal, circuitry to calculate said gain of said pipelined ADC using said capacitor characterizations, and an output adjusting component to digitally change an output of said pipelined ADC to compensate for said calculated gain.

摘要翻译： 流水线模数转换器（ADC）包括用于表征与所述流水线ADC的级的乘法 - 数模转换器（MDAC）相关联的电容器的电路，所述电容器有助于所述流水线ADC的增益，电路 将当前未被表征的所述电容器的子集连接到所述流水线式ADC的参考信号，使得所述级的残留信号保持在测量所述残余信号的仪器的输入范围内，使用所述的方法计算所述流水线ADC的所述增益的电路 电容器特性和输出调整组件，以数字地改变所述流水线ADC的输出以补偿所述计算的增益。

公开(公告)号：US07302823B1

公开(公告)日：2007-12-04

申请号：US11428981

申请日：2006-07-06

申请人： Jimmie D. Jackson ,  Donald E. Lewis

发明人： Jimmie D. Jackson ,  Donald E. Lewis

IPC分类号： B21D9/00

CPC分类号： B21D7/16 ,  B21D9/16 ,  Y10S72/702

摘要： A pipe bending system employing a sensing and indicating system that provides feedback to an operator regarding the position of components of the pipe bending system, such as the pin-up shoe and the stiffback. Apparatus for retrofitting a sensing and indicating system to existing pipe bending apparatus.

摘要翻译： 一种使用感测和指示系统的管道弯曲系统，其向操作者提供关于管道弯曲系统的部件的位置的反馈，例如销钉鞋和刚性背部。 用于将感测和指示系统改装到现有管道弯曲装置的装置。

公开(公告)号：US6115624A

公开(公告)日：2000-09-05

申请号：US124935

申请日：1998-07-29

申请人： Donald E. Lewis ,  George D. Park ,  Randall I. Park

发明人： Donald E. Lewis ,  George D. Park ,  Randall I. Park

IPC分类号： A61B5/0205 ,  A61B5/0215 ,  A61B5/03 ,  A61B5/0448 ,  A61B7/04 ,  A61M25/00 ,  A61B5/0444

CPC分类号： A61B5/4362 ,  A61B5/035 ,  A61B5/0448 ,  A61B7/04 ,  A61B5/0205 ,  A61B5/02156 ,  A61M2025/0002

摘要： An intrauterine catheter device for monitoring fetal and/or maternal heart rate, including an elongate housing having proximal and distal portions, an array of ECG electrodes on the distal portion and one or more acoustic or other mechanical sensors on the distal portion. A pressure transducer may also be provided on the distal portion. Processor circuitry compares the ECG signal with the output signal of the acoustic sensor to derive fetal and/or maternal heart rate. An intrauterine catheter device is also provided, including a reference electrode on its distal portion, and an array of active electrodes spaced apart from one another on the distal portion. The device may also include a pressure transducer on the distal portion and processor circuitry coupled to the array of active electrodes and/or to the reference electrode for deriving fetal ECG from signals produced by the array of active electrodes. Alternatively, the array of electrodes and acoustic sensors may be provided on a flexible pad that may be secured to the abdomen of a pregnant mother. An intrauterine catheter device is also provided, including a plurality of lumens communicating with a differential pressure transducer provided on its distal portion, and having a zeroing switch on its proximal portion for resetting the pressure transducer in situ.

摘要翻译： 一种用于监测胎儿和/或母亲心率的子宫内导管装置，包括具有近端部分和远端部分的细长壳体，远端部分上的ECG电极阵列和远端部分上的一个或多个声学或其它机械传感器。 压力传感器也可以设置在远侧部分上。 处理器电路将ECG信号与声学传感器的输出信号进行比较以得到胎儿和/或母亲心率。 还提供了宫内导管装置，包括其远侧部分上的参考电极和在远端部分上彼此间隔开的活性电极阵列。 该装置还可以包括远侧部分上的压力换能器和耦合到有源电极阵列和/或参考电极的处理器电路，用于从由有源电极阵列产生的信号导出胎儿ECG。 或者，电极和声学传感器阵列可以设置在可以固定到怀孕母亲的腹部的柔性垫上。 还提供了宫内导管装置，其包括与设置在其远侧部分上的差压换能器连通的多个管腔，并且在其近端部分上具有调零开关，用于将压力传感器原位复位。

公开(公告)号：US08525556B2

公开(公告)日：2013-09-03

申请号：US13015981

申请日：2011-01-28

申请人： Ramesh Kumar Singh ,  Yusuf Haque ,  Donald E. Lewis

发明人： Ramesh Kumar Singh ,  Yusuf Haque ,  Donald E. Lewis

IPC分类号： G11C27/02

CPC分类号： G11C27/02 ,  G11C7/1042 ,  G11C27/024

摘要： A time-interleaved sample-and-hold system includes a first sample-and-hold circuit and a second sample-and-hold circuit. The first sample-and-hold circuit and the second sample-and-hold circuit share a common sampling switch. A method of remediating a timing offset between a first sample-and-hold circuit and a second sample-and-hold circuit in a time-interleaved sample-and-hold system includes switching at least one shunt capacitor disposed between two logic gates in a timing circuit to adjust a delay between a timing signal for a common sampling switch electrically coupled to the first and second sample-and-hold circuits and a timing signal for at least one of the sample-and-hold circuits.

摘要翻译： 时间交替采样和保持系统包括第一采样保持电路和第二采样保持电路。 第一采样保持电路和第二采样保持电路共用一个公共采样开关。 在时间交织的采样和保持系统中修复第一采样保持电路和第二采样保持电路之间的定时偏移的方法包括：切换至少一个分流电容器，该并联电容器设置在两个逻辑门之间 定时电路，用于调整电耦合到第一和第二采样保持电路的公共采样开关的定时信号与至少一个采样和保持电路的定时信号之间的延迟。

公开(公告)号：US20120194223A1

公开(公告)日：2012-08-02

申请号：US13015981

申请日：2011-01-28

申请人： Ramesh Kumar Singh ,  Yusuf Haque ,  Donald E. Lewis

发明人： Ramesh Kumar Singh ,  Yusuf Haque ,  Donald E. Lewis

IPC分类号： G11C27/02

CPC分类号： G11C27/02 ,  G11C7/1042 ,  G11C27/024

摘要： A time-interleaved sample-and-hold system includes a first sample-and-hold circuit and a second sample-and-hold circuit. The first sample-and-hold circuit and the second sample-and-hold circuit share a common sampling switch. A method of remediating a timing offset between a first sample-and-hold circuit and a second sample-and-hold circuit in a time-interleaved sample-and-hold system includes switching at least one shunt capacitor disposed between two logic gates in a timing circuit to adjust a delay between a timing signal for a common sampling switch electrically coupled to the first and second sample-and-hold circuits and a timing signal for at least one of the sample-and-hold circuits.

摘要翻译： 时间交替采样和保持系统包括第一采样保持电路和第二采样保持电路。 第一采样保持电路和第二采样保持电路共用一个公共采样开关。 在时间交织的采样和保持系统中修复第一采样保持电路和第二采样保持电路之间的定时偏移的方法包括：切换至少一个分流电容器，该并联电容器设置在两个逻辑门之间 定时电路，用于调整电耦合到第一和第二采样保持电路的公共采样开关的定时信号与至少一个采样和保持电路的定时信号之间的延迟。

公开(公告)号：US07688238B2

公开(公告)日：2010-03-30

申请号：US12055468

申请日：2008-03-26

申请人： Donald E. Lewis ,  Rex K. Hales

发明人： Donald E. Lewis ,  Rex K. Hales

IPC分类号： H03M1/10

CPC分类号： H03M1/1038 ,  H03M1/1061 ,  H03M1/168

摘要： A pipelined analog-to-digital converter includes a plurality of stages, each stage comprising an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). A method for increasing the accuracy of the pipelined ADC includes calibrating the ADC in each stage of the analog-to-digital converter by adjusting trip points of that ADC. Another method for increasing the accuracy of a pipelined ADC includes measuring error in an output of each the DAC; and correcting an output of the pipelined analog-to-digital converter for the measured error. These methods can be used together to further increase the accuracy of the pipelined ADC. Consequently, a pipelined analog-to-digital converter may include a look-up table containing data for correcting errors in output of each of the DACs, where trip points of the ADCs the ADCs in the stages of the pipelined converter have been calibrated to expected values.

摘要翻译： 流水线模数转换器包括多个级，每级包括模数转换器（ADC）和数模转换器（DAC）。 提高流水线ADC精度的一种方法包括通过调整该ADC的跳变点来校准模数转换器的每个级中的ADC。 提高流水线ADC精度的另一种方法包括测量每个DAC的输出误差; 以及校正所测量的误差的流水线模数转换器的输出。 这些方法可以一起使用，以进一步提高流水线ADC的精度。 因此，流水线模数转换器可以包括查找表，其包含用于校正每个DAC的输出中的误差的数据，其中流水线转换器级中的ADC的跳变点已被校准到期望值 价值观。

公开(公告)号：US20080238740A1

公开(公告)日：2008-10-02

申请号：US12055468

申请日：2008-03-26

申请人： Donald E. Lewis ,  Rex K. Hales

发明人： Donald E. Lewis ,  Rex K. Hales

IPC分类号： H03M1/10

CPC分类号： H03M1/1038 ,  H03M1/1061 ,  H03M1/168

摘要： A pipelined analog-to-digital converter includes a plurality of stages, each stage comprising an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). A method for increasing the accuracy of the pipelined ADC includes calibrating the ADC in each stage of the analog-to-digital converter by adjusting trip points of that ADC. Another method for increasing the accuracy of a pipelined ADC includes measuring error in an output of each the DAC; and correcting an output of the pipelined analog-to-digital converter for the measured error. These methods can be used together to further increase the accuracy of the pipelined ADC. Consequently, a pipelined analog-to-digital converter may include a look-up table containing data for correcting errors in output of each of the DACs, where trip points of the ADCs the ADCs in the stages of the pipelined converter have been calibrated to expected values.

摘要翻译： 流水线模数转换器包括多个级，每级包括模数转换器（ADC）和数模转换器（DAC）。 提高流水线ADC精度的一种方法包括通过调整该ADC的跳变点来校准模数转换器的每个级中的ADC。 提高流水线ADC精度的另一种方法包括测量每个DAC的输出误差; 以及校正所测量的误差的流水线模数转换器的输出。 这些方法可以一起使用，以进一步提高流水线ADC的精度。 因此，流水线模数转换器可以包括查找表，其包含用于校正每个DAC的输出中的误差的数据，其中流水线转换器级中的ADC的跳变点已被校准到期望值 价值观。